Jeep Liberty KJ. Manual — part 792
6.
CABIN HEATER RELAY CONTROL CIRCUIT OPEN
Turn the ignition off.
Remove the Cabin Heater Relay from the PDC.
Disconnect the ECM harness connectors.
Measure the resistance of the Cabin Heater Relay Control 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 Cabin Heater Relay Control 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
P1102-VISCOUS/CABIN HEATER RELAY SHORT TO GROUND
For a complete wiring diagram Refer to Section 8W
KJ
ENGINE DIESEL DIAG
9 - 1227
•
When Monitored:
With the ignition on and the ECM Viscous/Cabin Heater Relay command off.
•
Set Condition:
The ECM detects a short to ground on the Viscous/Cabin Heater Relay Control circuit for 0.5 seconds.
Possible Causes
INTERMITTENT CONDITION
ASD RELAY OUTPUT CIRCUIT OPEN
CABIN HEATER RELAY
CABIN HEATER RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
CABIN HEATER RELAY CONTROL CIRCUIT SHORTED TO GROUND
CABIN HEATER RELAY CONTROL CIRCUIT OPEN
ENGINE CONTROL MODULE
Diagnostic Test
1.
CABIN HEATER RELAY CLICKING
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, actuate the Viscous/Cabin Heater Relay.
Is the Cabin Heater Relay clicking?
Yes
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
No
>> Go To 2
2.
ASD RELAY OUTPUT CIRCUIT OPEN
Turn the ignition off.
Disconnect the Cabin Heater Relay from the PDC.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the ASD Relay
Output circuit at the Cabin Heater Relay connector in the PDC.
Does the test light illuminate brightly?
Yes
>> Go To 3
No
>> Repair the ASD Relay Output 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
3.
CABIN HEATER RELAY
Turn the ignition off.
Install a substitute relay in place of the Cabin Heater Relay.
Turn the ignition on.
With the scan tool, actuate the Viscous/Cabin Heater Relay for at least 20 seconds.
With the scan tool, read ECM DTCs.
Did this DTC set again?
Yes
>> Go To 4
No
>> Replace the Cabin Heater Relay.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
4.
CABIN HEATER RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the Cabin Heater Relay.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD
Relay connector in the PDC.
Turn the ignition on.
Measure the voltage on the Cabin Heater Relay Control circuit.
Is the voltage above 1.0 volt?
Yes
>> Repair the Cabin Heater Relay Control circuit for a short to
voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 5
5.
CABIN HEATER RELAY CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Remove the Cabin Heater Relay from the PDC.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Cabin Heater Relay
Control circuit.
Is the resistance above 1000 ohms?
Yes
>> Go To 6
No
>> Repair the Cabin Heater Relay Control circuit for a short to
ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
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