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P0891-TRANSMISSION RELAY ALWAYS ON (CONTINUED) For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - SCHE- For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes TRANSMISSION CONTROL RELAY STUCK CLOSED (T15) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO VOLTAGE (T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUITS SHORT TO VOLTAGE POWERTRAIN CONTROL MODULE Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS- Theory of Operation The transmission relay is used to supply power to the solenoid pack when in normal operating mode and to turn off 9 limp-in 9 mode. The relay output (which supplies power to the solenoid pack) is fed back to the controller This is referred to as SWITCHED BATTERY. After a controller reset (ignition key turned to the Diagnostic Test 1. CHECK TO SEE IF DTC P0891 IS CURRENT With the scan tool, view DTCs. Is the status Active for this DTC or is the STARTS SINCE SET counter equal to 0? Yes >> Go To 2 No >> Go To 6 2. TRANSMISSION CONTROL RELAY CONTACTS STUCK CLOSED Turn the ignition off to the lock position. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Is the resistance above 5.0 ohms? Yes >> Go To 3 No >> Replace the Transmission Control Relay. Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. 21 - 204 AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS ND |