Jeep Liberty KJ. Manual — part 682
P0180-FUEL TEMPERATURE SENSOR SIGNAL VOLTAGE TOO HIGH
For a complete wiring diagram Refer to Section 8W
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ENGINE DIESEL DIAG
KJ
•
When Monitored:
With the ignition on.
•
Set Condition:
The Fuel Temperature Sensor signal is above 4.95 volts for 0.5 seconds.
Possible Causes
FUEL TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
SENSOR GROUND CIRCUIT OPEN
FUEL TEMPERATURE SENSOR
FUEL TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
ENGINE CONTROL MODULE
Diagnostic Test
1.
CHECK FOR ACTIVE DTC
NOTE: If multiple DTCs are present, the most likely cause is a 5-Volt Supply or Sensor Ground circuit
shorted to voltage or ground. Refer to the Service Information Wiring section for circuits that would affect
multiple DTCs.
NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions
under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the
DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may
assist when checking for an active DTC.
Turn the ignition on.
With the scan tool, monitor the Fuel Temperature Sensor voltage.
Is the Fuel Temperature Sensor voltage above 4.80 volts?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
FUEL TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Fuel Temperature Sensor harness connector.
Turn the ignition on.
Measure the voltage on the Fuel Temperature Sensor Signal circuit.
Is the voltage above 5.5 volts?
Yes
>> Repair the Fuel Temperature Sensor Signal circuit for a
short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 3
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ENGINE DIESEL DIAG
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3.
FUEL TEMPERATURE SENSOR
Turn the ignition off.
Disconnect the Fuel Temperature Sensor harness connector.
Connect a jumper wire between the Fuel Temperature Sensor harness
connector cavities.
Turn the ignition on.
With the scan tool, read the Fuel Temperature Sensor voltage.
Is the voltage below 1.0 volt?
Yes
>> Replace the Fuel Temperature Sensor in accordance with
the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 4
4.
SENSOR GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the Fuel Temperature Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Sensor Ground circuit.
Is the resistance below 10.0 ohms?
Yes
>> Go To 5
No
>> Repair the Sensor Ground circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
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ENGINE DIESEL DIAG
KJ
5.
FUEL TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Fuel Temperature Sensor harness connector.
Measure the resistance of the Fuel Temperature Sensor Signal circuit.
Is the resistance below 10.0 ohms?
Yes
>> Replace and program the Engine Control Module in accor-
dance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Repair the Fuel Temperature Sensor Signal circuit for an
open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
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ENGINE DIESEL DIAG
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