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P0891-TRANSMISSION RELAY ALWAYS ON (CONTINUED) 4. TRANSMISSION SOLENOID/TRS ASSEMBLY Turn the ignition off to the lock position. Disconnect the Transmission Solenoid/TRS Assembly harness connec- NOTE: NOTE: Check connectors - Clean/repair as necessary. Measure the voltage at the (T16) Transmission Control Relay Output Is the voltage above 0.5 volts? Yes >> Repair the (T16) Transmission Control Relay Output circuit for a short to voltage. Perform 45RFE/545RFE TRANSMISSION VERIFICATION No >> Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform 45RFE/545RFE TRANSMISSION VERIFICATION 5. (T15)TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO VOLTAGE 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. Measure the voltage of the (T15) Transmission Control Relay Control Is the voltage above 0.5 volts? Yes >> Repair the (T15) Transmission Control Relay Control cir- cuit for a short to voltage. Perform 45RFE/545RFE TRANSMISSION VERIFICATION No >> Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. 21 - 600 AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS ND |