Jeep Liberty KJ. Manual — part 872
3.
VR SOLENOID
Turn the ignition off.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Monitor the scan tool for ECM DTCs.
Does the scan tool display P1250 VACUUM RESERVOIR SOLENOID OPEN CIRCUIT?
Yes
>> Replace the Vacuum Reservoir Solenoid.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Replace and program the Engine Control Module 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 DIESEL DIAG
KJ
P2264-WATER IN FUEL VOLTAGE BELOW LOWER LIMIT
For a complete wiring diagram Refer to Section 8W
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ENGINE DIESEL DIAG
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•
When Monitored:
With the ignition on.
•
Set Condition:
The Water In Fuel Sensor signal is below 0.51 volts for 0.2 second.
Possible Causes
WATER IN FUEL SENSOR
WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO CHASSIS GROUND
WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO WATER IN FUEL SENSOR GROUND
Diagnostic Test
1.
CHECK FOR ACTIVE DTC
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, erase ECM DTCs.
Turn the ignition off, wait 10 seconds, then turn the ignition on.
With the scan tool, read ECM DTCs.
Did this DTC set again?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
WATER IN FUEL SENSOR
Turn the ignition off.
Disconnect the Water In Fuel Sensor harness connector.
Turn the ignition on.
With the scan tool, read the Water In Fuel Sensor voltage.
Is the voltage above 4.8 volts?
Yes
>> Replace the Water In Fuel Sensor in accordance with the Service Information.
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.
WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the BCM harness connectors.
Disconnect the Water In Fuel Sensor harness connector.
Measure the resistance between ground and the Water In Fuel Sensor
Signal circuit.
Is the resistance above 1000 ohms?
Yes
>> Go To 4
No
>> Repair the Water In Fuel Sensor Signal circuit for a short to
ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
4.
WATER IN FUEL SENSOR SIGNAL AND GROUND CIRCUITS SHORTED TOGETHER
Measure the resistance between the Water In Fuel Sensor Signal circuit
and Sensor Ground circuit.
Is the resistance above 1000 ohms?
Yes
>> Replace and program the Front 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 Water In Fuel Sensor Signal and Ground circuits
for a short together.
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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