Jeep XJ. Manual — part 640
Symptom:
*CHECKING THE WATER IN FUEL LAMP OPERATION
POSSIBLE CAUSES
MESSAGE CENTER
PCM
PCM - WATER IN FUEL SIGNAL CIRCUIT
SENSOR GROUND OPEN
WATER IN FUEL LAMP BULB
WATER IN FUEL SENOR SIGNAL CIRCUIT OPEN
WATER IN FUEL SENSOR
WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
TEST
ACTION
APPLICABILITY
1
NOTE: Be sure a water in fuel condition does not exist before continuing.
Turn the ignition on while monitoring the Water In Fuel Lamp.
Choose the appropriate answer.
All
The lamp turns on and stays on.
The lamp turns on for 2 seconds then off
The lamp does not turn on at all.
2
Turn the ignition off.
Disconnect the Water In Fuel Sensor harness connector.
Turn the ignition on while observing the Water In Fuel Lamp.
Does the Water In Fuel Lamp turn on and stay on?
All
Yes
→
No
→
Replace the Water In Fuel Sensor
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Water In Fuel Sensor harness connector.
Measure the resistance between engine ground and the Water In Fuel Sensor Signal
circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Water In Fuel Sensor Signal circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
212
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Water In Fuel Sensor harness connector.
Measure the resistance between the Sensor Ground circuit and the Water In Fuel
Sensor Signal circuit.
Is the resistance above 100 kohms?
All
Yes
→
Replace and program the PCM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair the Water In Fuel Sensor Signal circuit for a short to the
Sensor Ground circuit.
Perform ROAD TEST VERIFICATION - VER-2.
5
Turn the ignition off.
Disconnect the Water In Fuel Sensor harness connector.
Turn the ignition on.
Connect a jumper wire across the Water In Fuel Sensor harness connector cavities 1
and 2.
Observe the Water In Fuel Lamp.
Is the lamp on?
All
Yes
→
Test Complete.
No
→
6
Turn the ignition off.
Disconnect the Water In Fuel Sensor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance of the Water In Fuel Sensor Signal circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Water In Fuel Sensor Signal circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
7
Turn the ignition off.
Disconnect the Water In Fuel Sensor harness connector.
Measure the resistance of the Sensor Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Replace and program the PCM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair the Sensor Ground circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
8
Turn the ignition off.
Remove and inspect the Water In Fuel Lamp bulb.
Is the bulb OK?
All
Yes
→
Replace the Message Center.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace the Water In Fuel Lamp Bulb.
Perform ROAD TEST VERIFICATION - VER-2.
213
DRIVEABILITY - DIESEL
*CHECKING THE WATER IN FUEL LAMP OPERATION —
Continued
Symptom:
P1655-AC CONTROL OPEN CIRCUIT - DIESEL
When Monitored and Set Condition:
P1655-AC CONTROL OPEN CIRCUIT - DIESEL
When Monitored:
With the ignition on.
Set Condition:
With the A/C clutch operation not requested, the ECM detects low voltage
on the A/C Clutch Relay Control circuit. NOTE: AC is an option that may not be present
on all vehicles.
POSSIBLE CAUSES
INTERMITTENT CONDITION
ASD/DIESEL POWER RELAY OUTPUT CIRCUIT OPEN
SUBSTITUTE A/C COMPRESSOR CLUTCH RELAY
A/C COMPRESSOR CLUTCH RELAY CONTROL CIRCUIT SHORTED TO GROUND
A/C COMPRESSOR CLUTCH RELAY CONTROL CIRCUIT OPEN
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, actuate the A/C Compressor Clutch Relay.
Is the A/C Compressor Clutch Relay clicking?
All
Yes
→
No
→
NOTE: Stop the A/C Compressor Clutch Relay actuation by the DRB.
2
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
214
HEATING & A/C
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Remove the A/C Compressor Clutch Relay from the PDC.
Turn the ignition on.
Using a 12-volt Test Light connected to ground, check the ASD/Diesel Power Relay
Output circuit.
Did the test light illuminate brightly?
All
Yes
→
No
→
Repair the ASD/Diesel Power Relay Output circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Install a substitute relay in place of the A/C Compressor Clutch Relay.
Turn the ignition on.
With the DRB, actuate the A/C Compressor Clutch Relay.
Is the A/C Compressor Clutch clicking?
All
Yes
→
Replace the A/C Compressor Clutch Relay.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
5
Turn the ignition off.
Disconnect the ECM harness connector(s).
Remove the A/C Compressor Clutch Relay from the PDC.
Measure the resistance between ground and the A/C Compressor Clutch Relay
Control circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the A/C Compressor Clutch Relay Control circuit for a
short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
6
Turn the ignition off.
Disconnect the ECM harness connector(s).
Remove the A/C Compressor Clutch Relay from the PDC.
Measure the resistance of the A/C Compressor Clutch Relay Control circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the A/C Compressor Clutch Relay Control circuit for an
open.
Perform ROAD TEST VERIFICATION - VER-2.
7
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
215
HEATING & A/C
P1655-AC CONTROL OPEN CIRCUIT - DIESEL —
Continued
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