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Test TC-50A: Trans 3-4 Solenoid/ Trans Relay Circuits

NOTE: This test applies to vehicles equipped with 4-speed automatic transmission only. For connector terminal identification, see CONNECTOR IDENTIFICATION . For component location and for appropriate wiring diagram, see WIRING DIAGRAMS article.
  1. If 12-VOLT RELAY CONTROL CIRCUIT DTC is also set, perform TEST TC-173A: TRANS 12-VOLT SUPPLY RELAY CNTRL CIRCUIT . If DTC is not set on AB body, go to next step. On all other bodies, go to step 3)  .
  2. If DTC SPECIFIC GOOD TRIPS counter is not displayed or displayed count is not "0", perform TEST TC-50E: TRANS 3-4 SOLENOID/ TRANS RELAY CIRCUITS . If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed count is "0", go to next step.
  3. 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, go to step 7)  . If vehicle shifts between third and fourth gear on AB body, perform TEST TC-50E: TRANS 3-4 SOLENOID/ TRANS RELAY CIRCUITS . On all other bodies, go to next step.
  4. Condition required to set DTC is not present at this time. 3-4 SHIFT SOLENOID CIRCUIT DTC sets if voltage detected on 3-4 shift solenoid circuit at PCM is different than expected voltage. Possible causes are: defective transmission relay, open or shorted wiring to 3-4 shift solenoid, open fused ignition switch output circuit, defective connector terminals, or defective 3-4 shift solenoid. Go to next step.
  5. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If wiring and connectors are okay, go to next step.
  6. Using scan tool, erase DTCs. Start engine. Using scan tool, read DTCs while wiggling wiring harness from 3-4 shift solenoid to PCM and note if 3-4 SOLENOID DTC resets. If DTC resets, repair wiring harness as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If DTC does not reset, see INACTIVE DTC CONDITION . Test is complete. Perform TEST VER-2A: ROAD TEST VERIFICATION .
  7. Turn ignition off. Disconnect Transmission (TRANS) solenoid connector. Inspect connector and terminals for damage. Repair connector 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 connector and terminals are okay, go to next step.
  8. Turn ignition on. Using scan tool, actuate TRANS control relay. Using scan tool in voltmeter mode, check voltage on TRANS solenoid connector, TRANS relay output circuit (White/Brown wire on AN body; Red wire on BE/BR bodies; Light Blue wire on all other bodies). If voltage does not switch from zero to more than 10 volts, perform TEST TC-50B: TRANS 3-4 SOLENOID/ TRANS RELAY CIRCUITS . If voltage switches from zero to more than 10 volts, go to next step.
  9. Turn ignition off. Disconnect 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.
  10. Turn ignition on. Check voltage on TRANS solenoid connector, 3-4 shift solenoid control circuit (Orange/White wire on AB body; Brown wire on all other bodies). If voltage is more than 10 volts, perform TEST TC-50D: TRANS 3-4 SOLENOID/ TRANS RELAY CIRCUITS . If voltage is 10 volts or less, go to next step.
  11. Turn ignition off. Using an external ohmmeter, check resistance between ground and PCM White connector, 3-4 shift solenoid control circuit (Orange/White wire on AB body; Brown wire on all other bodies). If resistance is less than 5 ohms, repair short to ground in 3-4 shift solenoid control circuit 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 resistance is 5 ohms or more, go to next step.
  12. Reconnect TRANS solenoid connector. Check resistance between ground and PCM White connector, 3-4 shift solenoid control circuit (Orange/White wire on AB body; Brown wire on all other bodies. If resistance is less than 5 ohms, repair short to ground in 3-4 shift solenoid control circuit 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 resistance is 5 ohms or more, go to next step.
  13. Remove TRANS control relay. Inspect TRANS relay connector and terminals for damage. Repair connector 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 connector and terminals are okay, go to next step.
  14. Using external ohmmeter, connect one lead to TRANS relay connector, TRANS control relay output circuit (White Brown wire on AN body; Red wire on BE/BR bodies; Light Blue wire on all other bodies). Go to next step.
  15. Connect other lead to PCM White connector, 3-4 shift solenoid control circuit (Orange/White wire AB body; Brown wire on all other bodies). If resistance is 26-40 ohms, 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 resistance is less than 26 ohms, perform TEST TC-50C: TRANS 3-4 SOLENOID/ TRANS RELAY CIRCUITS . If resistance is more than 40 ohms, go to next step.
  16. Turn ignition off. Disconnect TRANS solenoid connector. Inspect connector and terminals for damage. Repair connector 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 connector and terminals are okay, go to next step.
  17. Check resistance of 3-4 shift solenoid circuit (Orange/White wire on AB body; Brown wire on all other bodies) between PCM White connector and TRANS solenoid connector. If resistance is 5 ohms or more, repair open 3-4 shift solenoid circuit 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 resistance is less than 5 ohms, replace TRANS solenoid and harness assembly. 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.
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