7 19-12
7 19-12
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7 19-12
SUBJECT
DATE
SPN 1659/FMI 1 - GHG14
July 2012
Additions, Revisions, or Updates
Publication Number / Title
Platform
Section Title
Change
DDC-SVC-MAN-0084
DD Platform
SPN 1659/FMI 1 - GHG14
New section
All information subject to change without notice.
7 19-12
Copyright © 2012 DETROIT DIESEL CORPORATION
3
2 SPN 1659/FMI 1 - GHG14
2
SPN 1659/FMI 1 - GHG14
This diagnostic is typically Thermostat Monitor Error Detected.
Table 1.
SPN 1659/FMI 1
Description
Thermostat Error Detected
Monitored Parameter
Coolant Inlet temperature sensor
Typical Enabling Conditions
Engine speed 500-2500 RPM, coolant temperature > 65°C (149°F ) ,
battery voltage > 11 vDC, average engine load 25-55%, idle time
divided by total engine run time < 0.8, barometric pressure > 755 mbar
(10.95 PSI), ambient temperature > 10°C (50°F ) , coolant inlet
temperature when ignition is turned on is < 50°C (122°F ) .
Monitor Sequence
none
Execution Frequency
Once per drive cycle.
Typical Duration
30
Dash Lamps
MIL
Engine Reaction
Verification
Allow engine to cool down such that coolant inlet temperature is < 50°C
(122°F ) , drive vehicle for 30 minutes, preferably with a trailer (loaded
or unloaded), do not idle engine except when necessary.
1. Are any cooling system issues present?
a. Yes; repair cooling system issues first.
b. No; Go to step 2.
WARNING: ENGINE EXHAUST
To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area.
Engine exhaust is toxic.
WARNING: PERSONAL INJURY
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface,
parking brake is set, and the wheels are blocked.
2. Start engine and bring to operating temperature to 85°C (185°F).
3. Does engine reach operating temperature 85°C (185°F).
a. Yes; Go to step 4.
b. No; replace the engine cooling system thermostat. Refer to section "Removal of the Engine Coolant Thermostat and
Seal"
4. Shut engine OFF (key OFF engine OFF).
5. Disconnect inlet and outlet coolant temperature sensors.
6. Inspect inlet and outlet coolant temperature sensors, harness connectors for bent, spread or corroded pins.
a. If pin damage is found, repair as necessary.
b. If no pin damage is found, Go to step 7.
7. Check coolant sensor resistance; refer to chart for specifications, replace sensor which is out of range.
4
All information subject to change without notice.
Copyright © 2012 DETROIT DIESEL CORPORATION
7 19-12
7 19-12
Table 2.
Coolant Sensor Resistance Chart
Temp °C
Temp °F
Resistance (Ω) Resistance
Nominal
Low (Ω)
Resistance
High (Ω)
Nominal
Voltage (V)
Voltage Low
(V)
Voltage High
(V)
0
32
5872.8
5496.4
6249.2
2.56
2.51
2.61
10
50
3769
3640.3
3897.7
2.37
2.33
2.41
20
68
2480.7
2260.0
2701.4
2.14
2.05
2.22
30
86
1693.2
1613.4
1773.0
1.89
1.83
1.95
35
95
1401.1
1338.4
1463.8
1.75
1.69
1.81
40
104
1166.8
1117.5
1216.1
1.62
1.56
1.67
50
122
829.5
798.2
860.8
1.36
1.30
1.41
60
140
593.8
574.5
613.1
1.12
1.07
1.17
70
158
435.4
423.1
447.7
0.91
0.86
0.95
All information subject to change without notice.
7 19-12
Copyright © 2012 DETROIT DIESEL CORPORATION
5
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