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9 19-13
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SUBJECT
DATE
SPN 102/FMI 18 - GHG14 MCM2.1
October 2013
Additions, Revisions, or Updates
Publication Number / Title
Platform
Section Title
Change
DDC-SVC-MAN-0084
DD Platform
SPN 102/FMI 18
Complete revision to procedure with several steps added.
All information subject to change without notice.
9 19-13 Copyright © 2013 DETROIT DIESEL CORPORATION
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2 SPN 102/FMI 18 – GHG14
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SPN 102/FMI 18 – GHG14
This diagnostic is typically Intake Manifold Pressure Too Low.
Check as follows:
Table 1.
SPN 102/FMI 18 - GHG14
Description
Intake Manifold Pressure Too Low
Monitored Parameter
Intake Manifold Pressure
Typical Enabling Conditions
General Enabling Condition : Engine is in normal mode(not regen), steady state operation(highway
cruise operation)
Specific Enabling Conditions : See table below
Engine Parameter
Min
Max
Engine Speed (RPM)
1130
1810
Engine Torque (Nm)
1100
Intake Air Throttle Position (%)
5
Engine Coolant Outlet
Temperature (oC)
65
Barometric Pressure (mbar)
755
Ambient Temperature (oC)
-8
Engine Speed Gradient (RPM/s)
-10
10
Fuel Mass Gradient ((mg/
stroke)/s)
-10
10
Monitor Sequence
None
Execution Frequency
Continuous when enabling conditions met
Typical Duration
15 Seconds
Dash Lamps
MIL, CEL
Engine Reaction
None
Verification
Once engine is at standard operating temperature, drive at highway speed with loaded trailer above
1130 rpm continuously for five minutes.
1. Turn the ignition ON (key ON, engine OFF).
2. Check for other codes. Is SPN 51/FMI (any) also present?
a. Yes; repair those faults first.
b. No; Go to step 3.
3. Using DDDL/DDRS 7.10 or newer, compare inlet manifold pressure to barometric pressure.
4. Is the inlet manifold pressure within 10.3 kPa (1.5 psi) of barometric pressure?
a. Yes; Go to step 7.
b. No; Go to step 5.
5. Disconnect the inlet manifold pressure sensor harness connector.
6. Inspect the inlet manifold pressure sensor and harness connector for signs of damaged, bent, spread, corroded or
unseated (pushed out) pins and signs of moisture in the connector or wire damage near the connector.
a. If any damage is found, repair as necessary.
b. If no signs of damage are present, replace the inlet manifold pressure sensor. Refer to section "Removal of the
Intake Manifold Pressure/Temperature Sensor". Verify repairs.
7. Inspect the entire air intake system, including the Charge Air Cooler (CAC), for leaks and/or restrictions.
a. If the air intake system leaks or restrictions are found, repair as necessary. Verify repairs. Retest with verification
cycle; once engine is at standard operating temperature, drive at highway speed with loaded trailer above 1130
rpm continuously for five minutes.
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All information subject to change without notice.
Copyright © 2013 DETROIT DIESEL CORPORATION 9 19-13
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8.
9.
10.
11.
12.
13.
14.
b. If no air intake system leaks are found, Go to step 8.
Check for turbo type.
a. If AT Engine, Go to step 9.
b. If TC Engine, Go to step 18.
Turn the ignition OFF.
Ensure the wastegate solenoid has a dedicated air line from the vehicle primary air tank with a minimum pressure of
6.0 bar (87 psi). Is the air line dedicated?
a. Yes; Go to step 11.
b. No; Ensure the wastegate solenoid has a dedicated air line from the vehicle primary air tank with a minimum
pressure of 6.0 bar (87 psi). If the air line supplies other components, it will have to be altered. Verify repairs.
Inspect the wastegate actuator and the plumbing to and from the actuator. Verify wastegate opens and closes.
a. If binding or damage is found, repair as necessary.
b. If no damage is found, Go to step 12.
Inspect the air line connection to the wastegate solenoid for leaks.
a. If there are leaks, repair or replace as necessary.
b. If there are no leaks, Go to step 13.
Turn the ignition ON (key ON, engine OFF).
Using DDDL/DDRS 7.10 or newer, activate wastegate control from Service Routines Activate Outputs Panel. Run
slide control up to 95% - (Click Set) Wastegate will open with air psi available. Does wastegate open when
commanded?
a. Yes; Go to step 15.
b. No; Go to step 16.
NOTE: Wastegate activates at 0% or 95%. There is no response at 50%.
15. Move slide control down to 0. Does wastegate close when commanded?
a. Yes; Go to step 18.
b. No; Go to step 16.
16. Disconnect the Wastegate Solenoid harness connector.
17. Inspect the Wastegate Solenoid and harness connector for signs of damaged, bent, spread, corroded or unseated
(pushed out) pins and signs of moisture in the connector or wire damage near the connector.
a. If any damage is found, repair as necessary.
b. If no signs of damage are present, replace the wastegate solenoid. Refer to section "Removal of the DD13
Wastegate Solenoid" or Refer to section "Removal of the GHG14 DD15 Asymmetrical Turbocharger Wastegate
Solenoid".
18. Monitor Exhaust Gas Recirculation (EGR) delta P voltage (pin 109).
19. Is the EGR delta P voltage between 0.55 and 0.83 volts?
a. Yes; Go to step 22.
b. No; Go to step 20.
20. Remove the EGR delta P sensor from the mounting pad; leave electrical harness connected.
21. Is the EGR delta P voltage between 0.55 and 0.83 volts?
a. Yes; Go to step 22.
b. No; replace the EGR delta P sensor. Refer to section "Removal of the Delta P Sensor".
22. Turn the ignition OFF.
23. Inspect the EGR delivery pipe delta P pressure ports for blockage.
a. If excessive build up or blockage is found, clean the venturi pipe and reinstall the sensor.
b. If no damage is found, Go to step 24.
24. Remove the EGR cooler hot pipe, EGR crossover pipe and delivery pipe and inspect for excessive build up or
blockage.
Refer to section "Removal of the Exhaust Gas Recirculation Hot Pipe".
Refer to section "Removal of the Exhaust Gas Recirculation Crossover Tube".
a. If excessive build up or blockage is found, clean piping and replace EGR cooler.
b. If there is no excessive build up or blockage, Go to step 25.
All information subject to change without notice.
9 19-13 Copyright © 2013 DETROIT DIESEL CORPORATION
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2 SPN 102/FMI 18 – GHG14
25. Disconnect the EGR valve actuator pull rod. Inspect the ball sockets on the pull rod for free movement.
a. If the sockets do not rotate or move freely, replace the EGR valve actuator pull rod.
For the DD13, Refer to section "Removal of the Exhaust Gas Recirculation Valve Actuator Pull Rod".
For the DD15 and DD16, Refer to section "Removal of the Exhaust Gas Recirculation Valve Actuator Pull Rod".
b. If the sockets move freely, Go to step 26.
NOTE: Some resistance is normal; however, the actuator should not bind in any particular spot.
26. Physically move the EGR butterfly from stop-to-stop to check for full travel (some drag is normal).Verify EGR valve
closes.
a. If the EGR butterfly does not move stop-to-stop, replace the EGR valve.
For the DD13, Refer to section "Removal of the Exhaust Manifold".
For the DD15 and DD16, Refer to section "Removal of the DD15 and DD16 Exhaust Gas Recirculation Valve".
b. If no problem is found, reconnect the EGR valve actuator pull rod to the EGR valve and EGR actuator. Clear
fault codes and verify repairs. Retest with verification cycle; once engine is at standard operating temperature,
drive at highway speed with loaded trailer above 1130 rpm continuously for five minutes. If fault returns, Go to
step 27.
27. Visually inspect exhaust system for leaks or damage, including manifold, gaskets, turbine housing, EGR valve, and
Aftertreatment Device (ATD).
a. If leaks are found, repair as necessary. Verify repairs. Retest with verification cycle; once engine is at standard
operating temperature, drive at highway speed with loaded trailer above 1130 rpm continuously for five minutes.
If fault code returns, Go to step 28.
b. If no exhaust leaks are found, Go to step 28.
28. Inspect the turbocharger for damage. Is any damage present?
a. Yes; repair as necessary. Verify repairs. If fault returns, for DD13 engines, Go to step 30. For DD15/16 engines,
Go to step 29.
b. No; for DD13 engines, Go to step 30. For DD15/16 engines, Go to step 29.
29. Inspect the axial power turbine for damage. Is any damage present?
a. Yes; repair as necessary. Clear codes and verify repairs. Retest with verification cycle; once engine is at standard
operating temperature, drive at highway speed with loaded trailer above 1130 rpm continuously for five minutes.
If fault returns, Go to step 30.
b. No; Go to step 30.
30. Turn the ignition ON (key ON, engine OFF).
31. Using DDDL/DDRS 7.10 or newer perform Selective Catalyst Reduction (SCR) voltage service routine, to monitor the
DOC inlet pressure sensor (pin 87) and Diesel Particulate Filter (DPF) outlet pressure sensor (pin 72) voltages with key
ON and engine OFF. Are the DOC inlet pressure sensor and DPF outlet pressure sensor voltages between .44 – .56
volts?
a. Yes; Go to step 32.
b. If the voltage is greater than .56 volts, replace the suspect sensor. If the voltage is less than .44 volts, inspect
electrical connections between suspect sensor connector and Aftertreatment Control Module (ACM) for bent,
spread, or corroded pins. Repair as necessary.
32. Inspect the DOC pressure sensor tube and elbow and the DPF pressure sensor tube and elbow for leaks, kinks, or
blockages.
a. If leaks, kinks, or blockages are found, repair as necessary.
b. If no damage is found, Go to step 33.
33. Turn the ignition OFF.
34. Disconnect the MCM2.1 120-pin connector.
35. Inspect the MCM2.1 120-pin connector and the 120-pin harness connector for signs of corrosion, spread, unseated
(pushed out) or damaged pins, connector seal for damage (signs of water or oil intrusion) or signs of wire damage.
a. If signs of damage are found, repair as necessary.
b. If no signs of damage, Go to step 36.
36. Install a test MCM2.1 and retest with verification cycle; once engine is at standard operating temperature, drive at
highway speed with loaded trailer above 1130 rpm continuously for five minutes.
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All information subject to change without notice.
Copyright © 2013 DETROIT DIESEL CORPORATION 9 19-13
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37. If code does not return, replace MCM2.1. Refer to section "Removal of the Motor Control Module". Verify repairs.
Retest with verification cycle; once engine is at standard operating temperature, drive at highway speed with loaded
trailer above 1130 rpm continuously for five minutes.
All information subject to change without notice.
9 19-13 Copyright © 2013 DETROIT DIESEL CORPORATION
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