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P0888-TRANSMISSION RELAY ALWAYS OFF (CONTINUED) 5. (T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector and connect Miller tool Disconnect the Transmission Solenoid/TRS Assembly harness connec- CAUTION: Do not probe the PCM harness connectors. Probing Ignition on, engine not running. Using a 12-volt test light connected to ground, check all four (T16) Does the test light illuminate brightly on all four (T16) Trans- Yes >> Go To 6 No >> Repair the (T16) Transmission Control Relay Output cir- cuit(s) for an open or high resistance. Perform 45RFE/545RFE TRANSMISSION VERIFICATION 6. (T16) TRANSMISSION RELAY OUTPUT CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Measure the resistance between ground and the (T16) Transmission Is the resistance below 5.0 ohms? Yes >> Repair the (T16) Transmission Control Relay Output circuit for a short to ground. Perform 45RFE/545RFE TRANSMISSION VERIFICATION No >> Go To 7 21 - 198 AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS WK |