Dodge Caliber. Manual — part 928
7.
ENGINE CONTROL MODULE (ECM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Engine Coolant Tem-
perature Sensor and the Engine Control Module (ECM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Refer to any Technical Service Bulletins that may apply.
Were any problems found?
Yes
>> Repair as necessary.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Replace the Engine Control Module (ECM) in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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P0128-THERMOSTAT RATIONALITY
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
Engine temperature is at or below 19.9°C. With the engine running and no other ECT Sensor related DTC’s
present.
•
Set Condition:
Engine temperature does not increase by 10°C within 5 minutes.
Possible Causes
ENGINE COLD TOO LONG
Diagnostic Test
1.
CHECK COOLING SYSTEM PERFORMANCE
NOTE: The best way to diagnose this DTC is to allow the vehicle to remain outside overnight in order to
have a completely cold soaked engine.
NOTE: Extremely cold outside ambient temperatures may cause this DTC to set.
Verify that the coolant level is correct.
Start the engine.
With the scan tool, set the engine RPM to 1500 and allow the engine to warm up for 10-15 minutes.
With the scan tool, monitor the Engine Coolant Temperature value during the warm up cycle. Make sure the tran-
sition of temperature change is smooth.
Did the engine temperature reach a minimum of 80° C (176° F)?
Yes
>> Test Complete.
No
>> Refer to the Service Information for cooling system performance diagnosis. The most probable cause is
a Thermostat problem. Also, refer to any related TSBs.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
PM
P0181–FUEL TEMPERATURE SENSOR PERFORMANCE
For a complete wiring diagram Refer to Section 8W
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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Possible Causes
FUEL TEMPERATURE SENSOR - COLD
FUEL TEMPERATURE SENSOR - HOT
FUEL TEMPERATURE SENSOR CIRCUIT OPEN OR HIGH RESISTANCE
CONNECTOR OR TERMINAL PROBLEM
INTERMITTENT CONDITION
Diagnostic Test
1.
CHECKING FUEL TEMPERATURE SENSOR CONNECTOR
Turn the ignition off.
Disconnect the Fuel Temperature Sensor harness connector.
Inspect the connector for poor terminal contact, corrosion, damage or other problems.
Is there any evidence of connector problems?
Yes
>> Repair or replace as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 2
2.
FUEL TEMPERATURE SENSOR CIRCUITS OPEN OR HIGH RESISTANCE
Disconnect the ECM harness connectors.
Measure the resistance of both Fuel Temperature Sensor circuits between the Fuel Temperature Sensor harness
connector and the ECM harness connector.
Is the resistance below 10.0 ohms for both measurements?
Yes
>> Go To 3
No
>> Repair the Fuel Temperature Sensor circuit(s) that measured above 10.0 ohms for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
3.
FUEL TEMPERATURE SENSOR - COLD
NOTE: Allow the engine to completely cool to ambient temperature.
Connect the ECM harness connector.
Connect the Fuel Temperature Sensor harness connector.
Turn the ignition on.
With the scan tool, read and note the engine coolant temperature.
With the scan tool, read the Fuel Temperature and compare it to the engine coolant temperature reading.
Are the readings within 7°C (13°F) of each other?
Yes
>> Go To 4
No
>> Check the wiring and connectors associated with the Fuel Temperature Sensor for corrosion, damage or
other problems. Repair as necessary. If no problems are found, replace the Fuel Temperature Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
PM
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