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P0988-4C PRESSURE SWITCH RATIONALITY (CONTINUED) 13. (T48) 4C PRESSURE SWITCH SENSE CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333. Disconnect the PCM C4 harness connector. NOTE: Check connectors - Clean/repair as necessary. CAUTION: Do not probe the PCM harness connectors. Probing Is the resistance above 5.0 ohms? Yes >> Repair the (T48) 4C Pressure Switch Sense circuit for an open. Perform 45RFE/545RFE TRANSMISSION VERIFICATION No >> Go To 14 14. (T48) 4C PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T48) 4C Pressure Is the resistance below 5.0 ohms? Yes >> Repair the (T48) 4C Pressure Switch Sense circuit for a short to ground. Perform 45RFE/545RFE TRANSMISSION VERIFICATION No >> Replace the Powertrain Control Module per the Service Information. With the scan tool, perform the QUICK Perform 45RFE/545RFE TRANSMISSION VERIFICATION 21 - 632 AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS ND |