Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1383
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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•
When Monitored:
With the ignition on and the A/C Clutch Relay command off.
•
Set Condition:
The ECM detects a short to ground on the (C13) A/C Clutch Relay Control circuit for 1.0 second.
Possible Causes
INTERMITTENT DTC
(C13) A/C CLUTCH RELAY CONTROL CIRCUIT SHORTED TO GROUND
(C13) A/C CLUTCH RELAY CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
A/C CLUTCH RELAY
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 Clutch Relay.
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.
(C13) A/C CLUTCH RELAY CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the A/C Clutch Relay connector.
Disconnect the Engine Control Module (ECM) connector.
Measure the resistance between ground and the (C13) A/C Clutch
Relay Control circuit in the A/C Clutch Relay connector.
Is the resistance below 1000.0 ohms?
Yes
>> Repair the (C13) A/C Clutch Relay Control circuit for a short
to ground.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
No
>> Go to 3
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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3.
(C13) A/C CLUTCH RELAY CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
Measure the resistance of the (C13) A/C Clutch Relay Control circuit
between the A/C Clutch Relay connector and the Engine Control Mod-
ule (ECM) connector.
Is the resistance below 10.0 ohms?
Yes
>> Go to 4
No
>> Repair the (C13) A/C Clutch Relay Control circuit for an
open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
4.
A/C CLUTCH RELAY
Connect the Engine Control Module (ECM) connector.
Install a known good relay in place of the vehicle’s A/C Clutch Relay.
Turn the ignition on.
With the scan tool, Clear DTCs.
With the scan tool, actuate the A/C Clutch Relay.
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 5
No
>> Replace the A/C Clutch Relay in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
5.
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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