Jeep Liberty KJ. Manual — part 767
•
When Monitored:
With the ignition on and the ECM A/C Clutch Relay command on.
•
Set Condition:
The ECM detects excessive current on the A/C Clutch Relay Control circuit for 0.5 second.
Possible Causes
INTERMITTENT CONDITION
A/C CLUTCH RELAY
A/C CLUTCH RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
ECM
Diagnostic Test
1.
A/C CLUTCH RELAY OPERATION
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 A/C Clutch Relay.
Is the A/C Clutch 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.
A/C CLUTCH RELAY
Turn the ignition off.
Remove the A/C Clutch Relay from the PDC.
Turn the ignition on.
Using a 12-volt test light connected to 12-volts, probe the A/C Clutch
Relay Control circuit in the PDC.
With the scan tool, actuate the A/C Clutch Relay.
Does the test light cycle on and off?
Yes
>> Replace the A/C Clutch Relay.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 3
9 - 1126
ENGINE DIESEL DIAG
KJ
3.
A/C CLUTCH RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Remove the A/C Clutch Relay from the PDC.
Disconnect the ECM harness connector.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD
Relay connector.
Turn the ignition on.
Measure the voltage of the A/C Clutch Relay Control circuit.
Is the voltage above 1.0 volt?
Yes
>> Repair the A/C Clutch 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 4
4.
ECM
If there are no possible causes remaining, view repair.
Repair
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).
KJ
ENGINE DIESEL DIAG
9 - 1127
P0645-A/C CLUTCH RELAY CIRCUIT OPEN CIRCUIT
For a complete wiring diagram Refer to Section 8W
9 - 1128
ENGINE DIESEL DIAG
KJ
•
When Monitored:
With the ignition on and the ECM A/C Clutch Relay command off.
•
Set Condition:
The ECM does not detect voltage on the A/C Clutch Relay Control circuit for 0.5 second.
Possible Causes
INTERMITTENT CONDITION
FUSED ASD RELAY OUTPUT CIRCUIT OPEN
A/C CLUTCH RELAY
A/C CLUTCH RELAY CONTROL CKT OPEN
A/C CLUTCH RELAY CONTROL CIRCUIT SHORT TO GROUND
ECM
Diagnostic Test
1.
A/C CLUTCH RELAY OPERATION
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 A/C Clutch Relay.
Is the A/C Clutch 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.
FUSED ASD RELAY OUTPUT CIRCUIT OPEN
Turn the ignition off.
Remove the A/C Clutch Relay from the PDC.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused ASD
Relay Output circuit in the PDC.
Does the test light illuminate?
Yes
>> Go To 3
No
>> Repair the Fused ASD Relay Output circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 1129
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст