Dodge Caliber. Manual — part 993
P0645-A/C CLUTCH CONTROL CIRCUIT OPEN
For a complete wiring diagram Refer to Section 8W
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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•
When Monitored:
With the ignition on and the A/C compressor command off.
•
Set Condition:
The ECM does not detect voltage on the (C27) A/C Compressor Control circuit for 0.48 seconds.
Possible Causes
INTERMITTENT DTC
(C27) A/C COMPRESSOR CONTROL CIRCUIT SHORTED TO GROUND
(C27) A/C COMPRESSOR CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
(K343) FUSED MAIN RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE
A/C COMPRESSOR
ENGINE CONTROL MODULE (ECM)
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
With the scan tool, actuate the A/C Compressor.
Monitor the scan tool for at least two minutes.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
(C27) A/C COMPRESSOR CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the A/C Compressor harness connector.
Disconnect the Engine Control Module (ECM) harness connector.
Measure the resistance between ground and the (C27) A/C Compressor Control circuit in the A/C Compressor har-
ness connector.
Is the resistance above 10.0 ohms?
Yes
>> Go to 3
No
>> Repair the (C27) A/C Compressor Control circuit for a short to ground.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
3.
(C27) A/C COMPRESSOR CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
Measure the resistance of the (C27) A/C Compressor Control circuit between the A/C Compressor harness connec-
tor and the Engine Control Module (ECM) harness connector.
Is the resistance below 10.0 ohms?
Yes
>> Go to 4
No
>> Repair the (C27) A/C Compressor Control circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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4.
(K343) FUSED MAIN RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE
Connect the Engine Control Module (ECM) harness connector.
Turn the ignition on.
Using a 12 volt test light connected to ground, check the (K343) Fused Main Relay Output circuit in the A/C Com-
pressor harness connector.
NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connec-
tion to the battery.
Is the test light illuminated and bright?
Yes
>> Go to 5
No
>> Repair the (K343) Fused Main Relay Output circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
5.
A/C COMPRESSOR
Connect the Engine Control Module (ECM) harness connector.
Turn the ignition on.
With the scan tool, Clear DTCs.
With the scan tool, actuate the A/C Compressor.
Monitor the scan tool for at least two minutes.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
>> Go to 6
No
>> Replace the A/C Compressor in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
6.
ENGINE CONTROL MODULE (ECM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the A/C Clutch Relay
and the Engine Control Module (ECM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Refer to any Technical Service Bulletins that may apply.
Were any problems found?
Yes
>> Repair as necessary.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Replace the Engine Control Module (ECM) 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 ELECTRICAL DIAGNOSTICS - DIESEL
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P0646-A/C CLUTCH CONTROL CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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