Test TC-50C: Trans 3-4 Solenoid/ Trans Relay Circuits
NOTE:
Perform TEST TC-50A: TRANS 3-4 SOLENOID/ TRANS RELAY CIRCUITS before proceeding. For connector terminal identification, see CONNECTOR IDENTIFICATION . For component location and for appropriate wiring diagram, see WIRING DIAGRAMS article.
- Turn ignition off. Disconnect Transmission (TRANS) solenoid and Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES on AB body, or TEST VER-2A: ROAD TEST VERIFICATION on all other bodies. If connectors and terminals are okay, go to next step.
- Using an external ohmmeter, check resistance between TRANS solenoid connector, 3-4 shift solenoid control circuit (Orange/White wire on AB body; Brown wire on all other bodies) and all other circuits in solenoid connector. If resistance is less than 5 ohms between any 2 circuits, repair TRANS control relay output circuit for a short to other circuit(s), perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES on AB body, or TEST VER-2A: ROAD TEST VERIFICATION on all other bodies, and go to step 4) . If resistance is 5 ohms or more between all circuits, go to next step.
- Replace TRANS solenoid pack and wiring harness, perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES on AB body, or TEST VER-2A: ROAD TEST VERIFICATION on all other bodies, connect all disconnected connectors and go to next step.
- Road test vehicle and reach a speed of 50 MPH. Depress Overdrive (OD) switch 4 times so that vehicle attempts to shift from fourth gear to third gear and back. If vehicle does not shift between third and fourth gear, replace PCM and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES on AB body, or TEST VER-2A: ROAD TEST VERIFICATION on all other bodies. If vehicle shifts between third and fourth gear, test is complete.