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P0604-INTERNAL CONTROL MODULE RAM For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes POWER OR GROUND CIRCUIT TRANSMISSION CONTROL MODULE Always perform the 45RFE/545RFE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to Theory of Operation After the controller is reset (ignition turned to the RUN position), the microprocessor checks the integrity of each Diagnostic Test 1. CHECK WIRING AND CONNECTORS FOR INTERMITTENT OPERATION Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or Wiggle the wires while checking for shorted and open circuits. Check for any Service Bulletins that may apply. Were there any problems found? Yes >> Repair as necessary. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMIS- No >> Replace the TCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMIS- 21 - 444 AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS - (DIESEL) KJ |