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*NO RESPONSE FROM FDCM (FINAL DRIVE CONTROL MODULE) (CONTINUED) For a complete wiring diagram Refer to Section 8W. Possible Causes (A926) (A909) (A927) FUSED B(+) CIRCUIT OPEN OR SHORTED (Z901) (Z902) (Z913) GROUND CIRCUIT OPEN (F921) FUSED RUN RELAY OUTPUT CIRCUIT OPEN OR SHORTED (D65) CAN C BUS (+) CIRCUIT OPEN (D64) CAN C BUS (-) CIRCUIT OPEN FINAL DRIVE CONTROL MODULE Diagnostic Test 1. TEST FOR INTERMITTENT CONDITION Turn the ignition on. NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts. NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active NOTE: Check the FCM for any active CAN C hardware DTCs, perform DTC before proceeding. Does the scan tool display a red X next to the module? Yes >> Go To 2 No >> The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness con- 2. FUSED B(+) CIRCUIT OPEN OR SHORTED Turn the ignition off. Disconnect the Final Drive Control Module harness connectors. Using a 12-volt test light connected to ground, check each Fused B(+) Does the test light illuminate brightly for each circuit? Yes >> Go To 3 No >> Repair the Fused B(+) circuit for an open or short. Perform the FDCM VERIFICATION TEST. 8E - 182 ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS WK |