Jeep Liberty KJ. Manual — part 582
3.
(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the C2 BCM harness connector.
Ignition on, engine not running.
Measure the voltage on the (N4) Fuel Level Signal circuit in the Fuel
Pump Module harness connector.
Is the voltage above 5.2 volts?
Yes
>> Repair the short to battery voltage in the (N4) Fuel Level
Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
(N4) FUEL LEVEL SIGNAL CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (N4) Fuel Level Signal circuit from the
Fuel Pump Module harness connector to the C2 BCM harness connec-
tor.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the open in the (N4) Fuel Level Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
5.
(K310) SENSOR GROUND CIRCUIT OPEN
Measure the resistance of the (K310) Sensor ground circuit from the
Fuel Pump Module harness connector to the C2 BCM harness connec-
tor.
Is the resistance below 5.0 ohms?
Yes
>> Go To 6
No
>> Repair the open in the (K310) Sensor ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
6.
BCM
NOTE: Before continuing, check the BCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MOD-
ULES - STANDARD PROCEDURE)
No
>> Replace and program the Body Control Module per Service Information.
Perform the BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MOD-
ULES - STANDARD PROCEDURE)
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 387
P0480-COOLING FAN 1 CONTROL CIRCUIT
For a complete wiring diagram Refer to Section 8W.
9 - 388
ENGINE ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
With the ignition on. Battery voltage greater than 10 volts.
•
Set Condition:
An open or shorted circuit is detected in the radiator fan relay control circuit for more than 2.7 seconds. One
Trip Fault. Three good trips to turn off the MIL.
Possible Causes
INTERNAL (A16) FUSED B+ CIRCUIT
INTERNAL (F1) FUSED IGNITION SWITCH OUTPUT CIRCUIT
(N201) COOOLING FAN NO.1 RELAY CONTROL CIRCUIT OPEN
(N201) COOOLING FAN NO.1 RELAY CONTROL CIRCUIT SHORTED TO GROUND
LOW SPEED RADIATOR FAN RELAY
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
LOW SPEED RADIATOR FAN RELAY OPERATION
Ignition on, engine not running.
With a scan tool, actuate the Low Speed Radiator Fan Relay.
Is the Cooling Fan Relay operating?
Yes
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 2
2.
(A16) FUSED B+ CIRCUIT
Turn the ignition off.
Remove the Low Speed Radiator Fan Relay.
Using a 12-volt test light connected to ground, probe the (A16) Fused
B+ circuit.
Does the test light illuminate brightly?
Yes
>> Go To 3
No
>> Repair the open or short to ground in the (A16) Fused B+
circuit. Inspect the related fuse and repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 389
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