Diagnostic Trouble Code (DTC) Charts

Diagnostic Trouble Code (DTC) Charts
Diagnostic Trouble Code (DTC) Charts
Note: Before proceeding to the Pinpoint Test, refer to the Diagnostic Trouble Code (DTC)
Descriptions for additional information to assist in diagnosis.
6.0L Diesel DTCs Chart
Diagnostic Trouble
Code (DTC)
Application
Continuous Memory
111
112
ALL
ALL
113
ALL
114*
ALL
115*
ALL
121*
ALL
122*
ALL
123*
ALL
124*
ALL
125*
ALL
131*
ALL
132*
ALL
133*
ALL
134*
ALL
135*
ALL
141
142
143
145
146
147
151*
ALL
ALL
ALL
ALL
ALL
ALL
ALL
152*
ALL
154
ALL
155
ALL
No errors detected
GO to Powertrain Control Module Power (PCM
PWR) Test.
GO to Powertrain Control Module Power (PCM
PWR) Test.
GO to Engine Coolant Temperature (ECT)
Sensor Test.
GO to Engine Coolant Temperature (ECT)
Sensor Test.
GO to Manifold Absolute Pressure (MAP)
Sensor Test.
GO to Manifold Absolute Pressure (MAP)
Sensor Test.
GO to Manifold Absolute Pressure (MAP)
Sensor Test.
GO to Injection Control Pressure (ICP) Sensor
Test.
GO to Injection Control Pressure (ICP) Sensor
Test.
GO to Accelerator Pedal Position Sensor and
Idle Validation Switch (APS/IVS) Test.
GO to Accelerator Pedal Position Sensor and
Idle Validation Switch (APS/IVS) Test.
GO to Accelerator Pedal Position Sensor and
Idle Validation Switch (APS/IVS) Test.
GO to Accelerator Pedal Position Sensor and
Idle Validation Switch (APS/IVS) Test.
GO to Accelerator Pedal Position Sensor and
Idle Validation Switch (APS/IVS) Test.
GO to Vehicle Speed Sensor (VSS) Test.
GO to Vehicle Speed Sensor (VSS) Test.
GO to Camshaft Position (CMP) Sensor Test.
GO to Camshaft Position (CMP) Sensor Test.
GO to Crankshaft Position (CKP) Sensor Test.
GO to Crankshaft Position (CKP) Sensor Test.
GO to Barometric Absolute Pressure (BAP)
Sensor Test.
GO to Barometric Absolute Pressure (BAP)
Sensor Test.
GO to Intake Air Temperature (IAT) Sensor
Test.
GO to Intake Air Temperature (IAT) Sensor
Test.
(Continued)
2004 F650/F750 6.0L Diesel
Diagnostic Trouble Code (DTC) Charts
6.0L Diesel DTCs Chart
Diagnostic Trouble
Code (DTC)
Application
Continuous Memory
161*
ALL
162*
ALL
163*
ALL
164*
ALL
211*
ALL
212*
ALL
215
225
ALL
ALL
231
236
ALL
ALL
241
246
251
256
261
ALL
ALL
ALL
ALL
ALL
264
ALL
267
311*
ALL
ALL
312*
ALL
GO to Manifold Air Temperature (MAT) Sensor
Test.
GO to Manifold Air Temperature (MAT) Sensor
Test.
GO to Exhaust Gas Recirculation (EGR)
Actuator Test.
GO to Exhaust Gas Recirculation (EGR)
Actuator Test.
GO to Engine Oil Pressure (EOP) Sensor
Test.
GO to Engine Oil Pressure (EOP) Sensor
Test.
GO to Vehicle Speed Sensor (VSS) Test.
GO to Engine Oil Pressure (EOP) Sensor
Test.
GO to Data Link Test.
GO to Engine Coolant Level (ECL) Sensor
Test.
GO to Injection Pressure Regulator (IPR) Test.
GO to Engine Fan Control (EFAN) Test.
GO to Glow Plug Control (GPC) Circuit Test.
See Note 11.
GO to Variable Geometry Turbocharger (VGT)
Actuator Test.
GO to Exhaust Gas Recirculation (EGR)
Actuator Test.
GO to Engine Crank Inhibit (ECI) System Test.
GO to Engine Oil Temperature (EOT) Sensor
Test.
GO to Engine Oil Temperature (EOT) Sensor
Test.
313
ALL
Refer to
314
ALL
Refer to
315*
ALL
316
321
ALL
ALL
322
ALL
323
324
325
ALL
ALL
ALL
331*
ALL
332*
ALL
333*
ALL
(Continued)
2004 F650/F750 6.0L Diesel
Section 3 Symptom Charts.
Section 3 Symptom Charts.
Refer to Section 3 Symptom Charts.
See Note 9.
Section 3 Symptom Charts.
Refer to Section 3 Symptom Charts.
Refer to
See note 10.
See Note 3.
Refer to Section 3 Symptom Charts.
GO to Injection Control Pressure (ICP) System
Test.
GO to Injection Control Pressure (ICP) Sensor
Test.
GO to Injection Control Pressure (ICP) System
Test.
Diagnostic Trouble Code (DTC) Charts
6.0L Diesel DTCs Chart
Diagnostic Trouble
Code (DTC)
Application
Continuous Memory
334
ALL
335
ALL
341*
ALL
342*
ALL
343*
344*
ALL
ALL
345
346
351
353
354
355
361
365*
366*
367*
421-428
431-438
451-458
523
ALL
ALL
ALL
ALL
ALL
ALL
ALL
ALL
ALL
ALL
ALL
ALL
ALL
ALL
525*
ALL
533
ALL
534
ALL
543*
ALL
551
ALL
552
ALL
553
ALL
554
ALL
571-578*
ALL
GO to Injection Control Pressure (ICP) System
Test.
GO to Injection Control Pressure (ICP) System
Test.
GO to Exhaust Back Pressure (EBP) Sensor
Test.
GO to Exhaust Back Pressure (EBP) Sensor
Test.
GO to Air Management System Test.
GO to Exhaust Back Pressure (EBP) Sensor
Test.
GO to Air Management System Test.
GO to Air Management System Test.
GO to Air Management System Test.
GO to Air Management System Test.
GO to Air Management System Test.
GO to Air Management System Test.
GO to Air Management System Test.
GO to Air Management System Test.
GO to Air Management System Test.
GO to Air Management System Test.
GO to Injector Drive Circuits Test.
GO to Injector Drive Circuits Test.
GO to Injector Drive Circuits Test.
GO to Injection Driver Module Power (IDM
PWR) Test.
GO to Injection Driver Module Power (IDM
PWR) Test.
GO to Injection Driver Module Power (IDM
PWR) Test.
GO to Injection Driver Module Power (IDM
PWR) Test.
GO to Powertrain Control Module
(PCM)/Injector Driver Module (IDM)
Communications Test.
GO to Powertrain Control Module
(PCM)/Injector Driver Module (IDM)
Communications Test.
GO to Powertrain Control Module
(PCM)/Injector Driver Module (IDM)
Communications Test.
GO to Powertrain Control Module
(PCM)/Injector Driver Module (IDM)
Communications Test.
GO to Powertrain Control Module
(PCM)/Injector Driver Module (IDM)
Communications Test.
See Note 4.
(Continued)
2004 F650/F750 6.0L Diesel
Diagnostic Trouble Code (DTC) Charts
6.0L Diesel DTCs Chart
Diagnostic Trouble
Code (DTC)
Application
Continuous Memory
613*
614*
621*
622*
623*
624
626
ALL
ALL
ALL
ALL
ALL
ALL
ALL
631
632
655
661
664
665
ALL
ALL
ALL
ALL
ALL
ALL
See Note 5.
See Note 6.
See Note 7.
See Note 7.
See Note 6.
See Note 7.
GO to Powertrain Control Module Power (PCM
PWR) Test.
See Note 8.
See Note 8.
See Note 7.
See Note 8.
See Note 7.
See Note 8.
(1) Note 1: * Indicates amber ENGINE indicator on when a Diagnostic Trouble Code (DTC) is set.
(2) Note 2: ** Indicates red ENGINE indicator on if the Engine Warning Protection System (EWPS)
is enabled and a DTC is set.
(3) Note 3: DTC 324 does not indicate any system or circuit fault. Diagnostic tests are not required
for this DTC.
(4) Note 4: When DTCs are set for cylinder balance, perform all Performance Diagnostics Tests.
Refer to Section 4.
(5) Note 5: Install correct PCM or IDM.
(6) Note 6: Check engine family rating code (EFRC) for the current PCM strategy. Reprogram the
PCM or change the EFRC as required. Refer to Section 2.
(7) Note 7: Reprogram the PCM. Refer to Section 2.
(8) Note 8: Install a new PCM.
(9) Note 9: DTC 316 only indicates the engine has not been able to reach operating temperature.
It does not indicate a circuit fault. Refer to the Workshop Manual for cooling system
diagnostics.
(10) Note 10: If coolant level is correct, GO to Engine Coolant Level (ECL) Sensor Test.
(11) Note 11: Refer to the Workshop Manual for cooling system diagnostics.
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
DTC
Description
Possible Causes
Diagnostic Aids
111 — No Errors
Detected
PCM
No errors detected
No errors detected
112 — Electrical System
Voltage B+ Out Of Range
High
The PCM internally
monitors battery voltage.
When the PCM
continuously receives
greater than 23 volts a
DTC will be set.
• DTC 112 is set when the
PCM detects a generator
output greater than 23
volts at pin X3-3 for more
than 0.5 seconds.
• DTC 112 can be set
when jump starting the
engine and additional
voltage is introduced.
Incorrect external battery
connections can cause
the voltage increase.
• If the condition causing
DTC 112 is intermittent,
the code will change
from active to inactive
status. DTC 112 will not
cause the amber
ENGINE indicator to turn
on.
The PCM monitors the
VREF voltage and will
adjust the signal values for
the sensors that use VREF
for operation. If a sensor or
circuit pulls VREF lower
than 5 volts, the PCM may
set out of range high DTCs
for the sensors that
operate on VREF (APS,
BAP, B+, and VSS).
113 — Electrical System
Voltage B+ Out Of Range
Low
The PCM internally
monitors battery voltage.
When the PCM
continuously receives less
than 7.0 volts, a DTC will
be set.
• DTC 113 can be set by a
defective generator or
PCM power relay,
discharged batteries, or
increased resistance in
the battery feed circuits.
• If the condition causing
DTC 113 is intermittent,
the code will change
from active to inactive
status. DTC 113 will not
cause the amber
ENGINE indicator to turn
on.
DTC 113 is set when the
PCM detects less than 7.0
volts at pin X3-3 for more
than 0.5 seconds.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Description
Possible Causes
114 — Engine Coolant
Temperature Signal Out
Of Range Low
DTC
The PCM continuously
monitors the signal of the
ECT sensor to determine if
the signal is within an
expected range. If the PCM
detects an out of range
high or low, the PCM will
ignore the ECT signal and
assume an engine coolant
temperature of -34°C
(-29°F) for starting and
82°C (180°F) for engine
running conditions. When
this occurs, the EWPS,
CAP, IST, cold idle
advance, and coolant
compensation features are
disabled.
• DTC 114 is set by the
PCM when the ECT
signal is less than 0.127
volts for more than 0.35
seconds.
• DTC 114 can set due to
a short to ground in the
signal circuit or a
defective sensor.
• When DTC 114 is set the
amber ENGINE indicator
is illuminated.
Signal voltage was less
than 0.127 volts for more
than 0.35 seconds.
115 — Engine Coolant
Temperature Signal Out
Of Range High
The PCM continuously
monitors the signal of the
ECT sensor to determine if
the signal is within an
expected range. If the PCM
detects an out of range
high or low, the PCM will
ignore the ECT signal and
assume an engine coolant
temperature of -34°C
(-29°F) for starting and
82°C (180°F) for engine
running conditions. When
this occurs, the EWPS,
CAP, IST, cold idle
advance, and coolant
compensation features are
disabled
• DTC 115 is set by the
PCM when the ECT
signal is greater than 4.6
volts for more than 0.35
seconds.
• DTC 115 can set due to
an open signal or ground
circuit, a short to a
voltage source, or a
defective sensor.
• When DTC 115 is set the
amber ENGINE indicator
is illuminated.
Signal voltage was greater
than 4.6 volts for more
than 0.35 seconds.
121 — Intake Manifold
Absolute Pressure Signal
Out Of Range High
The PCM will ignore the
MAP signal when the
signal is detected to be out
of range or an incorrect
value is read. The engine
will continue to operate
based on estimated values.
• DTC 121 can be set due
to a sensor signal wire
short to VREF or B+ or a
defective MAP sensor
• When DTC 121 is active
the amber ENGINE
indicator is illuminated.
DTC 121 is set by the
PCM when the MAP signal
is greater than 4.9 volts for
more than 0.4 seconds.
122 — Intake Manifold
Absolute Pressure Signal
Out Of Range Low
The PCM will ignore the
MAP signal when the
signal is detected to be out
of range or an incorrect
value is read. The engine
will continue to operate
based on estimated values.
• DTC 122 can be set due
to a sensor signal circuit
open or shorted to
ground or a defective
MAP sensor. DTC 122
can also be set due to an
extremely restricted
CAC/intake system.
• When DTC 122 is active
the amber ENGINE
indicator is illuminated.
DTC 122 is set by the
PCM when the MAP signal
is less than 0.039 volts for
more than 0.4 seconds.
(Continued)
2004 F650/F750 6.0L Diesel
Diagnostic Aids
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
DTC
Description
Possible Causes
123 — Intake Manifold
Absolute Pressure Signal
In-Range Fault
The PCM will ignore the
MAP signal when the
signal is detected to be out
of range or an incorrect
value is read. The engine
will continue to operate
based on estimated values.
• DTC 123 can be set due
to a restricted or plugged
sensor inlet, VREF
shorted to a voltage
source greater than 5.5
volts, or a defective MAP
sensor.
• When DTC 123 is active
the amber ENGINE
indicator is illuminated.
DTC 123 is set by PCM
when the MAP signal is
greater than 120 kPa (2
psi) absolute at low idle.
124 — Injection Control
Pressure Signal Out Of
Range Low
The PCM continuously
monitors the signal of the
ICP sensor to determine if
the signal is within an
expected range. If the PCM
detects a higher or lower
voltage than expected, the
PCM will set a DTC,
illuminate the amber
ENGINE indicator, ignore
the ICP sensor signal, and
use a preset value based
on engine operating
conditions.
• DTC 124 can be set due
to an open or short to
ground on the signal
circuit, a defective sensor
or an open VREF circuit
or a VREF circuit short to
ground.
• When DTC 124 is active
the amber ENGINE
indicator is illuminated.
DTC 124 is set by the
PCM if signal voltage is
less than 0.039 volts for
more than 0.1 seconds.
125 — Injection Control
Pressure Signal Out Of
Range High
The PCM continuously
monitors the signal of the
ICP sensor to determine if
the signal is within an
expected range. If the PCM
detects a higher or lower
voltage than expected, the
PCM will set a DTC,
illuminate the amber
ENGINE indicator, ignore
the ICP sensor signal, and
use a preset value based
on engine operating
conditions.
• DTC 125 can be set due
to an open signal ground
circuit, short to a voltage
source on the ICP signal
circuit, or a defective
sensor.
• When DTC 125 is active
the amber ENGINE
indicator is illuminated.
DTC 125 is set by the
PCM if the signal voltage is
greater than 4.9 volts for
more than 0.1 seconds.
(Continued)
2004 F650/F750 6.0L Diesel
Diagnostic Aids
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Possible Causes
Diagnostic Aids
131 — APS Signal Out Of
Range Low
DTC
The PCM continuously
monitors the APS/IVS
circuits for expected
voltages. It also compares
the APS and IVS signals
for conflict. If the PCM
detects an APS signal out
of range low, the engine
will ignore the APS signal
and operate at low idle.
• Possible causes include
a short to ground or an
open in the APS signal
circuit.
• DTC 131 can be set due
to a short to ground or
an open VREF or signal
circuits. If the condition
causing DTC 131 is
intermittent and the
condition is no longer
present, the code will
become inactive and
normal engine operation
will resume.
• When DTC 131 is active
the amber ENGINE
indicator is illuminated.
DTC 131 is set if the PCM
detects voltage less than
0.147 volts.
132 — APS Signal Out Of
Range High
The PCM continuously
monitors the APS/IVS
circuits for expected
voltages. It also compares
the APS and IVS signals
for conflict. If the PCM
detects an APS signal out
of range high, the engine
will ignore the APS signal
and operate at low idle.
• DTC 132 can be set due
to a short to VREF or B+
in the APS signal circuit.
• When DTC 132 is active
the amber ENGINE
indicator is illuminated.
DTC 132 is set if the PCM
detects a voltage greater
than 4.55 volts. The PCM
monitors voltage on VREF
A and will adjust signal
values for the sensors that
use VREF A for operation.
If a sensor or circuit pulls
VREF less than 5 volts, the
PCM may set out of range
high DTCs for the sensors
that operate on VREF B
(APS, BAP, B+, and VSS).
133 — APS Signal In
Range DTC
The PCM checks the
voltage output of the APS
by comparing the APS
signal with the IVS signal.
APS and IVS signals can
disagree in two cases:
• The APS signal indicates
the pedal is pressed
down to accelerate, but
the IVS signal indicates
idle position.
• The APS signal indicates
the pedal has been
released to allow the
engine to return to idle,
but the IVS signal
indicates off-idle position
of the pedal.
If the PCM detects either
of the above conditions,
the PCM attempts to
isolate the source of
conflict and set the
appropriate DTC.
• If the IVS signal is
changing and the APS
signal is constant, the
PCM assumes the APS
is the conflict source and
sets DTC 133. The
engine rpm is restricted
to idle.
• When DTC 133 is active
the amber ENGINE
indicator is illuminated.
DTC 133 is caused by
intermittent conditions. The
DTC will remain active until
the vehicle has been
shutdown and restarted.
The DTC does not recover
without cycling the key
switch.
(Continued)
2004 F650/F750 6.0L Diesel
Description
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Description
Possible Causes
Diagnostic Aids
134 — APS Signal And
IVS Disagree
DTC
The PCM checks the
voltage output of the APS
by comparing the APS
signal with the IVS signal.
APS and IVS signals can
disagree in two cases:
• The APS signal indicates
the pedal is pressed
down to accelerate, but
the IVS signal indicates
idle position.
• The APS signal indicates
the pedal has been
released to allow the
engine to return to idle,
but the IVS signal
indicates off-idle position
of the pedal.
If the PCM detects either
of the above conditions,
the PCM attempts to
isolate the source of
conflict and set the
appropriate DTC.
• If neither the APS or IVS
is changing, or both are
changing, or the PCM
cannot determine the
DTC in specified time,
DTC 134 is set and
engine rpm is restricted
to idle.
• When DTC 134 is active
the amber ENGINE
indicator is illuminated.
DTC 134 is caused by
intermittent conditions. The
DTC will remain active until
the vehicle has been
shutdown and restarted.
The DTC does not recover
without cycling the key
switch.
135 — Idle Validation
Switch Circuit Fault
The PCM checks the
voltage output of the APS
by comparing the APS
signal with the IVS signal.
APS and IVS signals can
disagree in two cases:
• The APS signal indicates
the pedal is pressed
down to accelerate, but
the IVS signal indicates
idle position
• The APS signal indicates
the pedal has been
released to allow the
engine to return to idle,
but the IVS signal
indicates off-idle position
of the pedal.
If the PCM detects either
of the above conditions,
the PCM attempts to
isolate the source of
conflict and set the
appropriate DTC.
• If the APS is changing
but IVS is constant, the
PCM assumes the IVS is
the conflict source and
sets DTC 135. In this
case the PCM limits the
APS signal to a lower
value that provides less
than full rpm, but does
not limit engine rpm to
idle.
• When DTC 135 is active
the amber ENGINE
indicator is illuminated.
DTC 135 is caused by
intermittent conditions. The
DTC will remain active until
the vehicle has been
shutdown and restarted.
The DTC does not recover
without cycling the key
switch.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Description
Possible Causes
Diagnostic Aids
141 — Vehicle Speed
Sensor Signal Out Of
Range Low
DTC
The PCM performs
diagnostic checks on the
VSS circuit when the
engine is operating at 0
mph. The PCM transmits a
voltage signal on the VSS
circuit and determines if
the return voltage is out of
range high or low. When a
fault condition is detected,
the PCM disables the
cruise control and power
takeoff. If the road speed
limiting option is enabled,
the PCM will limit engine
rpm for all gears.
• DTC 141 is set by the
PCM when an out of
range low condition is
detected in the VSS
circuit.
• When DTC 141 is active
the amber ENGINE
indicator is not
illuminated.
The PCM will not set DTCs
for VSS circuit failure for
vehicles equipped with
Allison MD (WTEC) and
2000 series transmissions.
For vehicles equipped with
MD transmissions,
diagnose the
communication circuit
(CAN 1) between the
engine and transmission
module.
142 — Vehicle Speed
Sensor Signal Out Of
Range High
The PCM performs
diagnostic checks on the
VSS circuit when the
engine is operating at 0
mph. The PCM transmits a
voltage signal on the VSS
circuit and determines if
the return voltage is out of
range high or low. When a
fault condition is detected,
the PCM disables the
cruise control and power
takeoff. If the road speed
limiting option is enabled,
the PCM will limit engine
rpm for all gears.
• DTC 142 is set by the
PCM when an out of
range high condition is
detected in the VSS
circuit.
• When DTC 142 is active
the amber ENGINE
indicator is not
illuminated.
The PCM monitors voltage
on VREF A and will adjust
signal values for the
sensors that use VREF A
for operation. If a sensor or
circuit pulls VREF less than
5 volts, the PCM may set
out of range high DTCs for
the sensors that operate on
VREF B (APS, BAP, B+,
and VSS).
143 — Incorrect CMP
Signal Signature
An inactive CMP signal
during cranking is
detectable by the PCM.
During engine cranking the
PCM monitors the CKP
signal and Injection Control
Pressure (ICP) to verify the
engine is rotating. If the
CMP signal is inactive
during this time a DTC will
be set. Electrical noise can
also be detected by the
PCM. When the level is
sufficient to affect engine
operation, a corresponding
DTC will be set.
• DTC 143 is set by the
PCM when the CMP
transition occurs at the
wrong CKP location.
• DTC 143 can be set due
to a mistimed CMP to
CKP signal, electrical
noise in the CMP circuit,
or a defective CMP
sensor.
An inactive CMP signal will
cause a no start condition.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Description
Possible Causes
Diagnostic Aids
145 — CMP Signal
Inactive
DTC
An inactive CMP signal
during cranking is
detectable by the PCM.
During engine cranking the
PCM monitors the CKP
signal and Injection Control
Pressure (ICP) to verify the
engine is rotating. If the
CMP signal is inactive
during this time a DTC will
be set. Electrical noise can
also be detected by the
PCM. When the level is
sufficient to affect engine
operation, a corresponding
DTC will be set.
• DTC 145 is set by the
PCM when the CMP
signal is inactive, the
CKP signal is active, and
the ICP has increased.
• DTC 145 can be set due
to an open short to
ground or open voltage
source in the CMP
circuit. A defective sensor
can cause DTC 145 to
be set.
An inactive CMP signal will
cause a no start condition.
146 — CKP Signal
Inactive
An inactive CKP signal
during cranking is
detectable by the PCM.
During engine cranking the
PCM monitors the CMP
signal and injection control
pressure to verify the
engine is rotating. If the
CKP signal is inactive
during this time a DTC will
be set. Electrical noise can
also be detected by the
PCM, if the level is
sufficient to effect engine
operation, a corresponding
DTC will be set.
• DTC 146 is set by the
PCM when no CKP
signal is detected while
the CMP signal is active
and ICP has increased.
• DTC 146 can be set due
to an open short to
ground or voltage source
in the CKP circuit. A
defective CKP sensor
can also set DTC 146.
An inactive CKP signal will
cause a no start condition.
147 — Incorrect CKP
Signal Signature
An inactive CKP signal
during cranking is
detectable by the PCM.
During engine cranking the
PCM monitors the CMP
signal and injection control
pressure to verify the
engine is rotating. If the
CKP signal is inactive
during this time a DTC will
be set. Electrical noise can
also be detected by the
PCM. If the level is
sufficient to affect engine
operation, a corresponding
DTC will be set.
• DTC 147 is set by the
PCM when the CKP
signal has too few or
many transitions per
engine rotation.
• DTC 147 can be set due
to an electrical noise in
the CKP circuit or a
defective CKP sensor.
An inactive CKP signal will
cause a no start condition.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
DTC
Description
Possible Causes
Diagnostic Aids
151 — Barometric
Absolute Pressure Signal
Out Of Range High
When the PCM detects the
BAP voltage signal out of
range high, the PCM will
ignore the BAP signal and
use the Manifold Absolute
Pressure (MAP) signal
generated at low idle as an
indication of barometric
pressure. When a MAP
fault is detected, the BAP
signal will default to
barometric pressure at sea
level, 100.24 kPa (29.6 in
Hg).
• DTC 151 is set when the
BAP signal is greater
than 4.95 volts for more
than 0.5 seconds.
• DTC 151 can be set
when the signal circuit is
shorted to VREF or B+.
A defective BAP sensor
can also set DTC 151.
• When DTC 151 is set the
amber ENGINE indicator
is illuminated.
The PCM monitors voltage
on VREF A and will adjust
signal values for the
sensors that use VREF A
for operation. If a sensor or
circuit pulls VREF less than
5 volts, the PCM may set
out of range high DTCs for
the sensors that operate on
VREF B (APS, BAP, B+,
and VSS).
152 — Barometric
Absolute Pressure Signal
Out Of Range Low
When the PCM detects the
BAP voltage signal out of
range low, the PCM will
ignore the BAP signal and
use the Manifold Absolute
Pressure (MAP) signal
generated at low idle as an
indication of barometric
pressure. When a MAP
fault is detected, the BAP
signal will default to
barometric pressure at sea
level, 100.24 kPa (29.6 in
Hg).
• DTC 152 can be set
when the signal circuit is
shorted to ground or
open. If VREF is shorted
to ground, DTC 152 can
be set. A defective BAP
sensor can set DTC 152.
• When DTC 152 is set the
amber ENGINE indicator
is illuminated.
DTC 152 is set when the
BAP signal is less than 1.0
volts for more than 0.5
seconds.
154 — Inlet Air
Temperature Signal Out
Of Range Low
When the PCM detects an
IAT signal out of range
low, the PCM will ignore
the IAT signal and assume
an ambient temperature of
25°C (77°F).
• DTC 154 can be set due
to a short to ground in
the signal circuit or a
defective IAT sensor.
• When DTC 154 is set,
the amber ENGINE
indicator is illuminated.
DTC 154 is set by the
PCM if signal voltage is
less than 0.127 volts for
more than 0.35 seconds.
When DTC 154 is set, the
PCM will default to 25°C
(77°F) for starting
155 — Inlet Air
temperature Signal Out
Of Range High
When the PCM detects an
IAT signal out of range
high, the PCM will ignore
the IAT signal and assume
an ambient temperature of
25°C (77°F).
• DTC 155 can set due to
an open signal or ground
circuit, a short to a
voltage source, or a
defective sensor.
• When DTC 155 is active,
the amber ENGINE
indicator is illuminated.
DTC 155 is set by the
PCM if signal voltage is
greater than 4.6 volts for
more than 0.35 seconds.
When DTC 155 is set, the
PCM will default to a value
of 25°C (77°F) for starting.
161 — Manifold Air
Temperature Signal Out
Of Range Low
The PCM continuously
monitors the signal of the
MAT sensor to determine if
the signal is within an
expected range. If the PCM
detects the signal voltage
is higher or lower than
expected, the PCM will set
a DTC.
• DTC 161 can be set due
to a short to ground in
the signal circuit or a
defective sensor.
• When DTC 161 is active
the amber ENGINE
indicator is illuminated.
DTC 161 is set by the
PCM when the signal
voltage is less than 0.098
volts for more than 0.35
seconds.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Description
Possible Causes
162 — Manifold Air
Temperature Signal Out
Of Range High
DTC
The PCM continuously
monitors the signal of the
MAT sensor to determine if
the signal is within an
expected range. If the PCM
detects the signal voltage
is higher or lower than
expected, the PCM will set
a DTC.
• DTC 162 can be set due
to an open signal or
ground circuit , short to a
voltage source, or a
defective sensor.
• When DTC 162 is active
the amber ENGINE
indicator is illuminated.
DTC 162 is set by PCM
when the signal voltage is
greater than 4.58 volts for
more than 0.35 seconds.
163 — Exhaust Gas
Recirculation Valve
Position Signal Out Of
Range Low
The EGRP sensor is
calibrated to zero position
each time the key is cycled
to allow compensation if
carbon deposits develop on
the valve. If the deposits
get so heavy that the
position is out of range to
zero, a DTC will be set, the
valve will close. When the
EGRP signal voltage is
detected out of range high
or low, the PCM will cause
the engine to ignore the
EGRP signal and the EGR
valve will close.
• DTC 163 is set by the
PCM when the EGRP
voltage is greater than
0.3 volts for more than
0.35 seconds.
• DTC 163 can be set due
to an open or short to
ground on the signal
circuit, a defective sensor
or an open VREF circuit
or a VREF circuit short to
ground.
• When DTC 163 is active
the amber ENGINE
indicator is illuminated.
The EGR actuator can be
tested for a stuck or
sticking valve by
performing an Output State
Low Test while monitoring
EGRP percentage. Refer to
Section 4 Performance
Diagnostics.
164 — Exhaust Gas
Recirculation Valve
Position Signal Out Of
Range High
The EGRP sensor is
calibrated to zero position
each time the key is cycled
to allow compensation if
carbon deposits develop on
the valve. If the deposits
get so heavy that the
position is out of range to
zero, a DTC will be set, the
valve will close. When the
EGRP signal voltage is
detected out of range high
or low, the PCM will cause
the engine to ignore the
EGRP signal and the EGR
valve will close.
• DTC 164 is set by the
PCM when the EGRP
voltage is greater than
4.5 volts for more than
0.35 seconds.
• DTC 164 can be set due
to an open or short to
ground on the signal
circuit, a defective sensor
or an open VREF circuit
or VREF short to ground.
• When DTC 164 is active
the amber ENGINE
indicator is illuminated.
The EGR actuator can
tested for a stuck or
sticking valve by
performing an Output State
Low Test while monitoring
EGRP percentage. Refer to
Section 4 Performance
Diagnostics.
211 — Engine Oil
Pressure Signal Out Of
Range Low
When the EOP signal
voltage is detected out of
range low, the PCM will
cause the engine to ignore
the EOP signal and disable
the Engine Warning and
Protection System (EWPS).
• DTC 211 can be set due
to an open or short to
ground on the signal
circuit, a defective sensor
or an open VREF circuit
or VREF short to ground.
• When DTC 211 is active
the amber ENGINE
indicator is illuminated.
DTC 211 is set by the
PCM when the EOP signal
is less than 0.039 volts for
more than 0.35 seconds.
(Continued)
2004 F650/F750 6.0L Diesel
Diagnostic Aids
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Description
Possible Causes
Diagnostic Aids
212 — Engine Oil
Pressure Signal Out Of
Range High
DTC
When the EOP signal
voltage is detected out of
range high, the PCM will
cause the engine to ignore
the EOP signal and disable
the Engine Warning and
Protection System (EWPS).
• DTC 212 can be set due
to an open signal ground
circuit, short to a voltage
source on the ICP signal
circuit, or a defective
sensor.
• When DTC 212 is set the
amber ENGINE indicator
is illuminated.
DTC 212 is set by the
PCM when the EOP signal
is greater than 4.9 volts for
more than 0.35 seconds.
215 — Vehicle Speed
Sensor Signal Frequency
Out Of Range High
The PCM performs
diagnostic checks on the
VSS circuit when the
engine is operating at 0
mph. The PCM transmits a
voltage signal on the VSS
circuit and determines if
the return voltage is out of
range high or low. When a
fault condition is detected,
the PCM disables the
cruise control and power
takeoff. If the road speed
limiting option is enabled,
the PCM will limit engine
rpm for all gears.
• DTC 215 is set by the
PCM when the PCM
detects a VSS signal
greater than 4365 Hz.
The PCM will not set DTCs
for VSS circuit failure for
vehicles equipped with
Allison MD (WTEC) and
2000 series transmissions.
Vehicles equipped with MD
transmissions only
diagnose the
communication circuit
(CAN 1) between the
engine and transmission
module.
225 — EOP Sensor
Signal In Range Fault
When the EOP signal
voltage is detected out of
range high, the PCM will
cause the engine to ignore
the EOP signal and disable
the Engine Warning and
Protection System (EWPS).
• DTC 225 is set by the
PCM when the EOP
signal voltage is higher
than expected with the
key ON and the engine
OFF.
• DTC 225 can be set due
to a biased circuit or a
defective EOP sensor.
• When DTC 225 is active
the amber ENGINE
indicator is illuminated.
KOEO Engine oil pressure
is greater than 15 psi.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
DTC
Description
Possible Causes
Diagnostic Aids
231 Data Communication
Link Error
The PCM continuously
monitors the datalink for an
open, short or intermittent
connection. If an active
DTC occurs on the
datalink, the diagnostic
software will not display
correct data.
• DTC 231 is set when the
PCM cannot access the
datalink. When this
occurs, data cannot be
retrieved using the scan
tool. DTCs can only be
retrieved using the cruise
control feature.
• DTC 231 can be set
when the any of the
following conditions
occur:
• Defective device
(transmission controller
or anti-lock brake
controller) is connected
to the bus and pulls
signal to ground.
• Number of devices
exceeds limit
• Defective PCM
• When DTC 231 is active
the amber ENGINE
indicator is not
illuminated.
Vehicles equipped with the
Allison WTEC transmission
may display DTC 231
when attempting to
program the PCM. The
WTEC controller must be
disconnected when
programming the engine
PCM.
236 ECL Switch Circuit
Fault
The PCM continuously
monitors the ECL circuit for
in-range faults. The PCM
does not detect open or
short circuits in the ECL
system. When the PCM
detects an in-range fault,
DTC 236 will be set.
• DTC 236 can be set
when a high resistance
connection or intermittent
short to ground in the
circuit exists.
• DTC 236 will not cause
the red ENGINE indicator
to illuminate. If the
condition is intermittent,
the DTC will be logged
as inactive.
Signal voltage was greater
than 3.4 volts or less than
4.3 volts more than 2.0
seconds.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Description
Possible Causes
241 — Injection Control
Pressure Regulator
Output Circuit Check
(OCC) Self-test Failed
DTC
An open or short to ground
in the EGR control circuit
can be detected by an on
demand output circuit
check during KOEO
Standard tests. If there is a
circuit fault detected a DTC
will be set. When the
engine is running, the PCM
can detect if the injection
control pressure is equal to
the desired pressure.
When the measured
injection control pressure
does not compare to the
desired pressure, the PCM
will ignore the measured
ICP signal and control the
engine with the desired
value.
• DTC 241 is set by the
PCM when the OCC test
has failed after the
KOEO Standard test has
been run.
• DTC 241 can be set
when a poor connection
to the IPR solenoid or
defective IPR coil exists.
• When DTC 241 is set the
engine will not run and
the amber ENGINE
indicator will not be
illuminated.
Output Circuit Check
detected indicates high or
low resistance in circuit.
246 — Engine Fan Output
Circuit Check (OCC)
Self-test Failed
An open or short to ground
in the EFAN can be
detected by the PCM
during an on-demand
engine standard test. The
IAT and ECT are
monitored continuously. If a
DTC is detected in the IAT
or ECT, the EFAN control
is disabled and the engine
fan is on all the time.
• DTC 246 is set by the
PCM only during the
KOEO Standard test.
During this test the PCM
performs an output circuit
test that momentarily
enables the EFAN
solenoid and measures
the voltage drop across
the relay
Before diagnosing, verify
the PCM is programmed
correctly. Verify the vehicle
has an electronic fan.
251 — Glow Plug Control
Output Circuit Check
(OCC) Self-test Failed
An open or short to ground
in the glow plug relay
circuit can be detected by
an on demand output
circuit check performed
during the KOEO Standard
tests. When a circuit fault
is detected, a DTC will be
set.
• DTC 251 can be set for
an open or shorted GPC
signal circuit, an open
feed circuit, or an open
glow plug relay coil.
Glow plug and glow plug
harness problems cannot
be detected by the PCM.
256 — Radiator Shutter
Enable Output Circuit
Check (OCC) Self-test
Failed
A fault in the Radiator
Shutter Enable (RSE)
circuit can be detected by
an on demand output
circuit check during KOEO
Standard test.
• DTC 256 can be set
when an open, short to a
voltage source or short to
ground in the RSE circuit
exists.
• DTC 256 can be set due
to a defective relay.
RSE output circuit check
self-test failed.
(Continued)
2004 F650/F750 6.0L Diesel
Diagnostic Aids
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
DTC
Description
Possible Causes
Diagnostic Aids
261 — Variable Geometry
Turbo Output Circuit
Check (OCC) Self-test
Failed
An open or short to ground
in the VGT control circuit
can be detected by an on
demand output circuit
check during KOEO
Standard tests. If there is a
circuit fault detected a DTC
will be set. When the
engine is running, the PCM
can detect if the exhaust
back pressure is equal to
the desired pressure.
When the measured
exhaust back pressure
does not compare to the
desired pressure, the PCM
will ignore the measured
EBP signal and will control
the engine with the desired
value.
• DTC 261 can be set
when an open or short to
ground in the VGT
control circuit or a
defective VGT coil exists.
DTC 261 can be set when
a poor connection to the
VGT solenoid exists.
264 — Exhaust Gas
Recirculation Output
Circuit Check (OCC)
Self-test Failed
An open or short to ground
in the EGR control circuit
can be detected by an on
demand output circuit
check during KOEO
standard test. If there is a
circuit fault detected a DTC
will be set.
• DTC 264 can be set due
to open or short to
ground, short to a
voltage source in the
EGR control circuit, or a
defective coil.
EGR output circuit check
self-test failed.
267 — Engine Crank
Inhibit Output Circuit
Check (OCC) Self-test
Failed
When the on demand
engine on standard test is
performed, an open or
short to ground can be
detected on the coil side of
the ECI relay.
• DTC 267 can be set due
an open or short to
ground on the coil side of
the ECI relay.
If the engine cranks when
the start switch is engaged,
check for failed ECI relay
or problems with the PCM
or PCM wiring harness.
311 — Engine Oil
Temperature Signal Out
Of Range Low
The EOT sensor provides
a feedback signal to the
PCM indicating engine oil
temperature. The PCM
monitors the EOT signal to
control fuel quantity and
timing throughout the
operating range of the
engine. During engine
operation, if the PCM
recognizes that the EOT
signal is lower or higher
than the expected value it
will set a DTC.
• DTC 311 can be set due
to a sensor signal wire
short to ground or a
defective EOT sensor.
• When DTC 311 is active
the amber ENGINE
indicator is illuminated.
DTC 311 is set by the
PCM when the EOT signal
is less than 0.2 volts for
more than 0.35 seconds.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Description
Possible Causes
Diagnostic Aids
312 — Engine Oil
Temperature Signal Out
Of Range High
DTC
The EOT sensor provides
a feedback signal to the
PCM indicating engine oil
temperature. The PCM
monitors the EOT signal to
control fuel quantity and
timing throughout the
operating range of the
engine. During engine
operation, if the PCM
recognizes that the EOT
signal is lower or higher
than the expected value it
will set a DTC.
• DTC 312 can be set due
to a signal or ground
circuit open, a short to a
voltage source, or a
defective EOT sensor.
• When DTC 312 is active
the amber ENGINE
indicator is illuminated.
DTC 312 is set by the
PCM when the EOT signal
is greater than 4.8 volts for
more than 0.35 seconds.
313 — Engine Oil
Pressure Below Warning
Level
• DTC 313 is set by the
PCM when the oil
pressure has dropped
below the warning level.
The specifications for the
warning level are :
• 34 kPa (5.0 psi) @ 700
rpm
• 69 kPa (10.0 psi) @
1400 rpm
• 138 kPa (20.0 psi) @
2000 rpm
• DTC 313 can be set due
to a defective sensor
sending an incorrect
signal. Low oil pressure
due to defective
mechanical components
will also set DTC 313.
• The PCM illuminates the
red ENGINE indicator
and sounds an audible
alarm.
Compare the actual oil
pressure to the reading on
the data list of the scan
tool.
314 — Engine Oil
Pressure Below Critical
Level
• DTC 314 is set by the
PCM when the oil
pressure has dropped
below the critical level.
The specification for the
critical level is:
• 14 kPa (2.0 psi) @ 700
rpm
• 34 kPa (5.0 psi) @
1400 rpm
• 152 kPa (12.0 psi) @
2000 rpm
• DTC 314 can be set due
to a defective sensor
sending an incorrect
signal. Low oil pressure
due to defective
mechanical components
will also set DTC 314.
• The PCM illuminates the
red ENGINE indicator
and sounds an audible
alarm.
Compare the actual oil
pressure to the reading on
the data list of the scan
tool.
315 — Engine Speed
Above Warning level
DTC 315 is set by the
PCM when the engine rpm
has exceeded 3350 rpm.
• DTC 315 can be set due
to any of the following
conditions:
• Excessive engine
speed in an unintended
downshift.
• Steep acceleration
downhill without correct
brake application.
• External fuel source
being ingested into air
intake system.
• When DTC 315 is active
the amber ENGINE
indicator is illuminated.
The engine hours and
miles of the last two over
speed occurrences will be
recorded in the Engine
Event Log.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Description
Possible Causes
Diagnostic Aids
316 — Engine Coolant
Temperature Unable To
Reach Commanded Set
Point
DTC
• DTC 316 is set if the
engine does not reach
operating temperature.
DTC 316 will only be set
with engines that have
cold ambient protection
(CAP) strategy enabled.
DTC 316 is set after the
engine has run for more
than 120 minutes and
has not exceeded the
following specifications
for engine coolant
temperature:
• Manual transmission
65° C (149° F)
• Automatic transmission
60° C (140° F)
• DTC 316 can be set due
to any of the following
conditions:
• Extended idle time.
• Cold ambient
temperatures (may
require use of winter
front).
• Thermostat stuck in
open position.
• Incorrectly plumbed
cooling system
(thermostat bypassed).
• Fan clutch locked on.
DTC 316 only indicates the
engine has not been able
to reach operating
temperature. It does not
indicate an electronic fault.
321 — Engine Coolant
Temperature Above
Warning Level
DTC 321 is set by the
PCM when the engine
coolant temperature is
above 109°C (228°F).
• The PCM illuminates the
red ENGINE indicator
and sounds the audible
alarm.
• When the temperature
drops below 109°C
(228°F) the DTC will
become inactive.
The PCM will log the
engine hours and odometer
reading at the time of
occurrence.
322 — Engine Coolant
Temperature Above
Critical Level
DTC 322 is set by the
PCM when the engine
coolant temperature is
above 112.5°C (234.5°F).
• The PCM illuminates the
red ENGINE indicator
and sounds the audible
alarm.
• When the temperature
drops below 112.5°C
(234.5°F) the DTC will
become inactive.
The PCM will log the
engine hours and odometer
reading at the time of
occurrence.
323 — Engine Coolant
Level Below
Warning/Critical Level
DTC 323 is set by the
PCM when coolant is low.
When the EWPS mode is
3-way protection and DTC
323 is active, the engine
will shutdown.
• When the coolant has
returned to correct levels,
DTC 323 will become
inactive. The PCM will
log the engine hours and
odometer reading at the
time of occurrence. After
the shutdown, the engine
can be restarted for thirty
seconds.
If coolant level is correct,
an ECL signal shorted to
ground can cause DTC
323.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Description
Possible Causes
Diagnostic Aids
324 — Idle Shutdown
Timer Enabled Engine
Shutdown
DTC
The IST feature is internal
to the PCM. The
subsystems that contribute
to the IST strategy have
their own fault codes. The
fault code for the IST is not
a system diagnostic trouble
code. The IST fault code is
only set to indicate that the
IST has been activated and
the engine has shutdown.
• DTC 324 is set by the
PCM when the engine
has been shutdown due
to exceeding the
programmed idle time
criteria. The IST feature
must be enabled for DTC
324 to be displayed.
DTC 324 does not indicate
any system or circuit
DTCs. Diagnostic checks
are not required for DTC
324.
DTC 325 — Power
Reduced - Matched To
Cooling System
Performance
DTC 325 is set by the
PCM when the cooling
system temperature
exceeds 107°C (225°C). At
this temperature the PCM
will reduce the fuel
delivered to the engine.
• When the temperature
drops below 107°C
(225°C ) the DTC will
become inactive and the
engine will return to
normal operation.
For each Celsius degree of
temperature the fuel will be
reduced 6%. This reduces
the heat produced by the
engine and reduces the
burden on the cooling
system. The vehicle speed
will also be reduced and
allow the operator to
downshift and increase the
efficiency of the cooling
system. As the temperature
is reduced the
compensation level is
reduced until the
temperature drops below
107°C (225°F ) and normal
operation is resumed.
DTC 331 - Injection
Control Pressure Above
System Working Range
DTC 331 is set by the
PCM when the injection
control pressure is above
normal working range of 25
MPa (3675 psi). When
DTC 331 is active, the
PCM will ignore feedback
from the ICP sensor and
control the IPR valve from
programmed default
values.
DTC 331 can be an
indicator of a problem in
the mechanical injection
control pressure system,
wiring, or ICP sensor.
Possible causes for DTC
331 include the following:
• Debris in engine
• Incorrect grade of oil
• Defective, stuck or
plugged inlet on the IPR
valve
• IPR control wire shorted
to ground
• ICP sensor or circuit
causing signal to be
biased high
The amber ENGINE
indicator will be illuminated
when DTC 331 is active.
Check oil level for
contamination, debris, and
correct API classification.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Possible Causes
Diagnostic Aids
332 — Injection Control
Pressure Above
Specification With Engine
Not Running
DTC
DTC 332 is set by the
PCM, if the voltage signal
from the ICP sensor is
higher than expected with
the key on engine off.
• DTC 332 can be caused
by a defective sensor, a
biased circuit, or
momentary loss of the
CMP/CKP signal.
• When DTC 332 is active
the amber ENGINE
indicator is illuminated.
If the PCM sets DTC 332,
the PCM will ignore the
ICP signal and operate the
IPR with fixed values
based on engine operating
conditions.
333 — Injection Control
Pressure Above/below
Desired Level
DTC 333 is set by the
PCM when the measured
pressure does not match
the pressure expected by
the PCM. DTC 333 will be
set if the measured value
is less than or greater than
2.5 MPa (362 psi) of
desired injection control
pressure for a period
greater than 7 seconds.
When DTC 333 is active,
the PCM will ignore
feedback from the ICP
sensor and control the IPR
valve from programmed
default values.
• Low oil level in
crankcase.
• Contaminated engine oil.
• Debris in engine oil.
• Aerated engine oil.
• Trapped air in the ICP
system (particularly after
an injector or high
pressure pump
replacement).
• Intermittent IPR valve
wiring connection.
Spread IPR harness
terminals at valve, poorly
crimped terminals, or
pulled back pins.
• Defective or stuck
injection pressure
regulator.
• Leaks in ICP system.
• Problem with ICP sensor
or sensor circuit,
incorrect sensor, system
biased high or low.
• Defective high pressure
hydraulic pump.
• The amber ENGINE
indicator will be
illuminated when DTC
333 is active.
If ICP system was
serviced, vehicle should be
operated 20 miles to
validate system
performance.
(Continued)
2004 F650/F750 6.0L Diesel
Description
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Description
Possible Causes
Diagnostic Aids
334 — ICP Unable To
Reach Set Point (Poor
Performance)
DTC
DTC 334 indicates an
injection control system
response time fault and
may be set during normal
engine operation through
the continuous monitor
function or during the
Engine Running Standard
Test. DTC 334 compares
measured ICP to desired
ICP and looks for a large
pressure difference of 9
MPa (1300 psi) for a period
of 3 seconds. When DTC
334 is active, the PCM
ignores the ICP sensor and
controls the IPR valve
operation from
programmed default
values.
• Low oil level in
crankcase.
• Contaminated engine oil.
• Debris in engine oil.
• Aerated engine oil.
• Trapped air in the ICP
system (particularly after
an injector or high
pressure pump
replacement)
• Intermittent IPR valve
wiring connection.
Spread IPR harness
terminals at valve, poorly
crimped terminals, or
pulled-back pins.
• Defective or stuck
injection pressure
regulator.
• Leaks in ICP system.
• Problem with ICP sensor
or sensor circuit,
incorrect sensor, system
biased high or low.
• Defective high pressure
hydraulic pump.
DTC 344 can be set due to
a plugged EBP sensor or a
restriction in the tube
leading to the sensor. To
check for this condition,
remove the sensor and
tube and inspect for carbon
deposits.
335 — ICP Unable To
Build Pressure During
Cranking
DTC 335 is set after the
PCM detects 8 to 10
seconds of engine cranking
with less than 5 MPa (725
psi) of ICP. Engine
cranking speed must be
greater than 130 rpm
before diagnostic trouble
code detection can begin.
• Low oil level in
crankcase
• No lube oil pressure or
lube oil delivery (reservoir
empty or not filling)
• Trapped air in the ICP
system (particularly after
an injector or high
pressure pump
replacement)
• Leaks in ICP system
• Defective or stuck
injection pressure
regulator
• Loose high pressure
hydraulic pump gear
• Defective high pressure
hydraulic pump
Engine cranking time
varies with engine
temperature. Verify ICP
sensor and IPR wiring is
connected. Check for oil
leaks. Verify if system has
been recently serviced (air
entrapment). If ICP system
was serviced, vehicle
should be operated 20
miles to validate system
performance.
341 — Exhaust Back
Pressure Signal Out Of
Range Low
When the EBP signal
voltage is detected out of
range low, the PCM will
cause the engine to ignore
the EBP signal. The EGR
valve will close and the
PCM will rely on the VGT
pre-programmed values.
• DTC 341 can be set due
to an open or short to
ground on the signal
circuit, a defective sensor
or an open VREF circuit
or VREF short to ground.
• When DTC 341 is active
the amber ENGINE
indicator is illuminated.
DTC 341 is set by the
PCM when the EBP signal
is less than 0.039 volts for
more than 0.5 seconds.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Description
Possible Causes
Diagnostic Aids
342 — Exhaust Back
Pressure Signal Out Of
Range High
DTC
When the EBP signal
voltage is detected out of
range high, the PCM will
cause the engine to ignore
the EBP signal. The EGR
valve will close and the
PCM will rely on the VGT
pre-programmed values.
• DTC 342 can be set due
to an open signal ground
circuit, short to a voltage
source on the EBP signal
circuit, or a defective
sensor.
• When DTC 342 is active
the amber ENGINE
indicator is illuminated.
DTC 342 is set by the
PCM when the EBP signal
is greater than 4.9 volts for
more than 0.5 seconds.
343 — Excessive Exhaust
Back Pressure (Gauge)
DTC 343 is set by the
PCM when the exhaust
backpressure is greater
than 260 kPa (37.7 psi).
• EBP sensor bias high
• EBP signal ground open
• Exhaust restriction
(muffler or catalytic
converter)
• VGT valve or vanes
stuck closed
• VGT Control Circuit short
to B
Make sure all sensor,
injector and actuator
electrical DTCs have been
repaired.
344 — Exhaust Back
Pressure Above
Specification When
Engine Off
DTC 344 is set by the
PCM when the EBP is
greater than 300 kPa (43.5
psi) when engine is off or
being cranked.
• EBP sensor bias high
• EBP sensor or tube line
plugged
Make sure all sensor,
injector and actuator
electrical DTCs have been
repaired.
345 — Faults Detected
During VGT Portion Of
The AMS Test
DTC 345 is set by the
PCM during the AMS test
when the PCM measures
the EBP and does not see
the expected response in
pressures.
• Oil pressure and quality
• High intake restriction
• Intake/CAC system leak
(pipes, loose clamps,
hoses)
• Exhaust system leak
• MAP sensor bias
• EBP sensor bias
• EGR stuck open
• VGT valve or vanes
sticking
• EBP sensor or tube
plugged
• Power cylinder integrity
• VGT control circuit
Make sure all sensor,
injector and actuator
electrical DTCs have been
repaired.
346 - Faults Detected
During EGR Portion Of
AMS Test
DTC 346 is set by the
PCM during AMS test
when the PCM measures
EBP and EGRP and does
not see the expected
response in pressures
versus position.
• EGR valve stuck or
sticking
• EGR valve position
sensor bias
• EBP sensor bias
• EBP sensor or tube
plugged
• EGR control circuit
Make sure all sensor,
injector and actuator
electrical DTCs have been
repaired.
351 - Change In Exhaust
Back Pressure Did Not
Occur When Expected
DTC 351 is set by the
PCM when less than 14.5
kPa (2.1 psi) is detected
between key ON and 2500
rpm.
• EBP tube or sensor
plugged
• EBP sensor bias
• EGR valve stuck open
• Exhaust system leak
Make sure all sensor,
injector and actuator
electrical DTCs have been
repaired.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
DTC
Description
353 - Variable Geometry
Turbo Control Over Duty
Cycle
DTC 353 is set when the
PCM overcompensates by
increasing duty cycle to the
VGT to achieve desired
boost/backpressure
• Oil pressure and quality
• High intake restriction
• Intake/CAC system leak
(pipes, loose clamps,
hoses)
• Exhaust system leak
• BAP sensor bias low
• MAP sensor bias low
• EBP sensor bias low
• ICP sensor bias high
• Power cylinder integrity
• ICP system integrity
• Injector operation/part
number
• EGR valve stuck open
• VGT valve or vanes
sticking
• VGT control circuit open
Possible Causes
Make sure all sensor,
injector and actuator
electrical DTCs have been
repaired.
354 — Variable Geometry
Turbo Control Under
Duty Cycle
DTC 354 is set when the
PCM overcompensates by
decreasing duty cycle to
the VGT to achieve the
desired
boost/backpressure.
•
•
•
•
•
Oil pressure and quality.
BAP sensor bias high.
MAP sensor bias high.
EBP sensor bias high.
Open exhaust (no
muffler).
ICP sensor bias low.
ICP system integrity.
Injector operation/part
number
Exhaust restriction
(muffler or catalytic
converter)
Make sure all sensor,
injector and actuator
electrical DTCs have been
repaired.
• High intake restriction
• Intake/CAC system leak
(pipes, loose clamps,
hoses)
• Restricted CAC system
• VGT valves or vanes
sticking
• Open exhaust (no
muffler)
• BAP sensor bias
• MAP sensor bias high
• EBP sensor bias low
Make sure all sensor,
injector and actuator
electrical DTCs have been
repaired.
•
•
•
•
355 — Variable Geometry
Turbo Overspeed
(Continued)
2004 F650/F750 6.0L Diesel
DTC 355 is set when the
PCM detects turbo over
speed several times in a
specific period of time
(dependent on PCM
calibration). Turbo speed is
estimated by engine speed,
boost pressure, and
barometric pressure.
Diagnostic Aids
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
DTC
Description
Possible Causes
Diagnostic Aids
361 - VGT Control Input
(MAP/EBP) Above/Below
Desired Level
DTC 361 is set when the
PCM detects an in range
error in the MAP/EBP
signal.
• High intake restriction
• Intake/CAC system leak
(pipes, loose clamps,
hoses)
• BAP sensor bias
• MAP sensor bias
• EBP sensor bias
• Power cylinder integrity
• ICP system integrity.
• Injector operation/part
number
• EGR valve stuck open
• VGT valve or vanes
sticking
• VGT control circuit open
• Open exhaust (no
muffler)
• Exhaust restriction or
leak (muffler or catalytic
converter)
Make sure all sensor,
injector and actuator
electrical DTCs have been
repaired.
DTC 365 - EGR Valve
Position Above/Below
Desired Level
DTC 365 is set when the
actual EGR valve position
does not match desired
position.
• EGR valve stuck or
sticking
• EGR valve position
sensor bias
• EBP sensor or tube
plugged
• EBP sensor bias
• EGR control circuit
Make sure all sensor,
injector and actuator
electrical DTCs have been
repaired.
DTC 366 - EGR Valve
Duty Operating Out Of
Expected Range
DTC 366 is set when the
PCM has
overcompensated by
increasing or decreasing
EGR duty to achieve the
desired EGRP.
• EGR valve stuck
• EGR valve sluggish
• EGR valve position
sensor error
• Exhaust leak
• BAP sensor bias
• EBP sensor bias
• MAP sensor bias
• EGR cooler
restriction/leak
Make sure all sensor,
injector and actuator
electrical DTCs have been
repaired.
DTC 367 - Improper
Position Signal When
EGR Valve Is Expected
Closed
DTC 367 is set when the
PCM detects the EGR
valve position is out of
desired range during initial
key ON (signal voltage
greater than 2.5 volts).
• EGR valve stuck open
• EGR valve position
sensor bias high
Make sure all sensor,
injector and actuator
electrical DTCs have been
repaired.
421 through 428 —
Cylinder #1 through
Cylinder #8 High Side To
Low Side Open
DTC 421-428 is set by the
PCM when the rising time
is too long on open or
close coil.
• DTC 421-428 usually
indicates a harness or
coil is open.
The last digit in the injector
DTC corresponds to the
cylinder where a fault has
been detected.
431 through 438 —
Cylinder #1 through
Cylinder #8 High Side
Shorted To Low Side
DTC 431-438 is set by the
PCM when the rising time
to 20 amps is short, but
not zero on the open or
close coil.
• DTC 431-438 usually
indicates an internally
shorted coil
The last digit in the injector
DTC corresponds to the
cylinder where a fault has
been detected.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
DTC
Description
Possible Causes
Diagnostic Aids
451 through 458 —
Cylinder #1 through
Cylinder #8 High Side
Short To Ground Or
VPWR
DTC 451-458 is set by the
PCM when the rising time
to 20 amps is zero on the
open or close coil.
• DTC 451-458 usually
indicates the harness or
coil is shorted to ground
The last digit in the injector
DTC corresponds to the
cylinder where a fault has
been detected.
523 — IDM VPWR
Voltage Low
The IDM internally monitors
battery voltage. When the
IDM continuously receives
less than 7 volts, a DTC
will be set.
• DTC 523 can be set due
to poor connections
between the IDM terminal
X3-7 and the ignition
switch.
DTC 523 is set by the
PCM when the voltage
from the ignition switch is
less than 7 volts.
525 — IDM Fault
DTC 525 is set by the
PCM when there is an
internal IDM failure.
• IDM
When DTC 525 is set,
install a new IDM.
533 — IDM Relay Voltage
High
DTC 533 is set by the
PCM when the voltage
from the IDM power relay
exceeds 16 volts.
• DTC 533 can be set due
to a generator voltage
output of greater than 16
volts or an incorrect
external battery
connections exist.
DTC 533 can be set when
jump starting the engine
534 — IDM Relay Voltage
Lowa
DTC 534 is set by the
PCM when the voltage
from the IDM power relay
is less than 7 volts.
• DTC 534 can be set due
to a defective generator,
IDM power relay,
discharged batteries or
increased resistance in
the battery feed circuits
IDM relay voltage is less
than 7 volts.
543 — PCM/IDM
Communications Fault
DTC 543 is set by the
PCM when the PCM is not
communicating with the
IDM.
• DTC 543 can be set
when the CAN 2 lines
between the PCM and
IDM are shorted to
ground, VREF, battery or
the current is open.
• When DTC 543 is active
the amber ENGINE
indicator is illuminated.
If IDM power is low, DTC
543 can be set.
551 — IDM/CMPO Signal
Inactive
DTC 551 is set by the
PCM when no CMPO
signal is present while the
CKPO is active.
• DTC 551 can be set
when the CMPO is open,
or shorted to ground or
shorted to a voltage
source. If logic power is
low, DTC 551 can be set.
DTC 551 can also be set
when no CMPO/CKPO is
present while the PCM
reports it is in the run
mode.
552 — IDM Incorrect
CMPO Signal Signature
DTC 552 is set when the
CMPO transition occurs at
the wrong CKPO tooth.
• DTC 552 can be set due
to a camshaft incorrectly
timed to crankshaft or an
electrical noise creating a
miscount on CMP
location.
The PCM continuously
monitors the IDM. When
the PCM fails to receive
required continuous
communication from the
IDM, the PCM will set a
DTC
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
DTC
Description
Possible Causes
Diagnostic Aids
DTC 553 — IDM CKPO
Signal Inactive
DTC 553 is set by the
PCM when no CKPO
signal is present while the
CMPO is active.
• DTC 553 can be set
when CKPO is open,
shorted to ground, or
shorted to a voltage
source. DTC 553 can
also be set if logic power
is low.
DTC 552 can also be set
when no CMPO/CKPO is
present while the PCM
reports it is in the run
mode.
554 — IDM Incorrect
CKPO Signal Signature
DTC 554 is set by the
PCM when CKPO signal
has too few or too many
transitions per engine
rotation.
• DTC 554 can be set due
to an electrical noise or a
defective CKP sensor.
The PCM continuously
monitors the IDM. When
the PCM fails to receive
required continuous
communication from the
IDM, the PCM will set a
DTC.
571 through 578 —
Cylinder #1 through
Cylinder #8 Cylinder
Balance Limit Exceeded
DTC 571 through 578 is
set by the PCM when the
IDM is unable to adjust fuel
quantity to compensate for
rough idle.
•
•
•
•
•
Oil pressure and quality
Fuel pressure
Intake restriction
EGR system
Exhaust system
restriction
When DTCs are set for
Cylinder Balance all
Performance Diagnostics
should be performed.
613 — PCM/IDM Software
Not Compatible
PCM/IDM software is
incompatible
• Replacement of PCM or
IDM
Install correct PCM or IDM.
614 — EFRC/PCM
Configuration Mismatch
Engine Family Rating
Code (EFRC) does not
match PCM strategy level.
• Incorrect Engine Family
Rating Code (EFRC)
selected for the PCM
strategy programmed in
the module.
Check EFRC and verify
that it matches the PCM
strategy level. Reprogram
the PCM or change the
EFRC as required.
621 — Engine Using Mfg.
Default Rating
Manufacturing defaults
selected. Very low power
(25 hp).
• Programmable
parameters for the PCM
were never programmed
in module. (Usually
occurs in new vehicle or
new module).
Program PCM.
622 — Engine Using
Field Default Rating
Engine using Field Default
Rating. Low power (lowest
rating in engine class) and
vehicle features not
working.
• Programmable
parameters for the PCM
incorrectly programmed
in module.
Program PCM.
623 — Invalid Engine
Family Rating Code
(EFRC)
Invalid EFRC.
• Wrong EFRC selected for
the PCM strategy
programmed in the
module
Check the EFRC and verify
that it matches the PCM
strategy level. Reprogram
the PCM or change the
EFRC as necessary.
624 — Field Default
Active
Vehicle features not
functioning (Low power lowest rating in engine
class).
• Programmable
parameters for the PCM
incorrectly programmed
in module
Program PCM.
(Continued)
2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions
Possible Causes
Diagnostic Aids
626 — Unexpected Reset
Fault
DTC
DTC 626 is set when
power is interrupted to the
PCM. Turning the ignition
OFF and then ON will
cause the code to change
from active to inactive
status.
• Loose or dirty
connections at battery or
ground cables can cause
the PCM to power down
• DTC 626 will not turn the
amber ENGINE indicator
on
• Intermittent connections
in the power feed wiring
The scan tool can be used
to display the ignition
switch voltage measured
by the PCM. Monitor the
voltage at PCM pins X4-1
and X4-2.
DTC 631 - Read Only
Memory (ROM) Self-Test
Fault
Internal ROM fault.
• Internal PCM fault
Install a new PCM.
DTC 632 - Random
Access Memory (RAM) CPU Self-Test Fault
Internal RAM fault.
• Internal PCM fault.
Install a new PCM.
655 — Programmable
Parameter List Level
Incompatible
Programmable parameter
list level incompatible.
• Programming problem or
internal PCM problem.
Program PCM.
661 — RAM
Programmable Parameter
List Corrupt
RAM programmable
parameter list corrupt. The
DTC will cause a no start
or the engine to run in field
defaults.
• Internal PCM problem.
Install a new PCM.
664 — Calibration Level
Incompatible.
Calibration level
incompatible. The DTC will
cause a no start or the
engine to run in field
defaults.
• Programmable problem
or internal PCM problem.
Program PCM.
665 — Programmable
Parameter Memory
Content Corrupt
Programmable parameter
memory content corrupt.
The DTC will cause a no
start or the engine to run in
field defaults.
• Internal PCM problem.
Install a new PCM.
2004 F650/F750 6.0L Diesel
Description
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