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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 490 (Powertrain Diagnostic Procedures - Diesel) >> Diagnostic Information And Procedures >> DRIVEABILITY - Diesel - Diagnostic Tests >> P0645-A/C Clutch Relay Circuit Excessive Current; P0645-A/C Clutch Relay Circuit Short Circuit >> Diagnostic Procedure

Diagnostic Procedure

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DIAGNOSTIC PROCEDURES - P0645-A/C CLUTCH RELAY CIRCUIT EXCESSIVE CURRENT

TEST ACTION APPLICABILITY
1
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 DRB 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 DRBIII®, actuate the A/C Clutch Relay.Is the A/C Clutch Relay clicking?Yes --> Go To 2No --> Go To 3		 All
2
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the conditions under which the DTC was set.Refer to any Technical Service Bulletins (TSB) that may apply.Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.Were any of the above conditions present?Yes --> Repair as necessary.Perform ROAD TEST VERIFICATION - VER-2 .No --> Test Complete.		 All
3 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 DRBIII®, actuate the A/C Clutch Relay.
Does the test light cycle on and off?
Yes --> Replace the A/C Clutch Relay.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Go To 4		 All
4 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 ROAD TEST VERIFICATION - VER-2 .
No --> Go To 5		 All
5 If there are no possible causes remaining, view repair.
Repair
Replace and program the Engine Control Module in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2 .		 All
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