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Test TC-171A: Governor Pressure Solenoid/Trans Relay Circuits

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For component location and wiring diagram, see WIRING DIAGRAMS article.
  1. Using scan tool, read DTCs. On all bodies except AB body, go to next step. If DTC SPECIFIC GOOD TRIPS counter is not displayed or displayed count is not "0", perform TEST TC-171E: GOVERNOR PRESSURE SOLENOID CIRCUIT . If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed count is "0", indicating DTC still exists, go to next step.
  2. If 12-VOLT RELAY CONTROL CIRCUIT DTC is also set, perform TEST TC-173A: TRANS 12-VOLT SUPPLY RELAY CNTRL CIRCUIT . If 12-VOLT RELAY CONTROL CIRCUIT DTC is not set, go to next step.
  3. Using scan tool, perform GOV and 3-4 shift valve system test. Select 1st gear and read governor pressure voltage. If voltage is one volt or more, go to step 7)  . If voltage is less than one volt on AB body, perform TEST TC-171E: GOVERNOR PRESSURE SOLENOID CIRCUIT . On all other bodies, go to next step.
  4. Condition required to set DTC is not present at this time. GOVERNOR PRESSURE SOLENOID CIRCUIT DTC sets if current state of solenoid output is different from expected output. Possible causes are: defective transmission control relay, incorrectly wired connector, open or shorted wiring, dirty or corroded connector, defective connector terminals, or defective PCM. 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 governor pressure solenoid to PCM and note if GOVERNOR PRESSURE SOLENOID CIRCUIT 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. On AB body, use scan tool to read and record FREEZE FRAME data to determine conditions present when DTC set. On all bodies, turn ignition off. Disconnect transmission 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 transmission control relay. Using scan tool in voltmeter mode, check voltage on transmission solenoid connector, transmission relay output circuit (White/Brown wire on AN body; Red wire on BE/BR and DN bodies; Light Blue wire on all other bodies). If voltage does not switch from zero to more than 10 volts, perform TEST TC-171B: GOVERNOR PRESSURE 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 transmission solenoid connector, governor pressure solenoid control circuit (Violet/White wire on BE/BR and DN bodies; Pink wire on all other bodies). If voltage is more than 10 volts, perform TEST TC-171D. If voltage is 10 volts or less, go to next step.
  11. Reconnect transmission solenoid connector. Turn ignition off. Using an external ohmmeter, check resistance between ground and PCM White connector, governor pressure solenoid control circuit (Violet/White wire on BE/BR and DN bodies; Pink wire on all other bodies). If resistance is 5 ohms or less, repair short to ground in governor pressure 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 more than 5 ohms, go to next step.
  12. Remove transmission control relay. Inspect transmission control 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.
  13. Using external ohmmeter, connect one lead to transmission control relay connector, transmission control relay output circuit (White/Brown wire on AN body; Red wire on BE/BR and DN bodies; Light Blue wire on all other bodies). Go to next step.
  14. Connect other lead to PCM White connector, governor pressure solenoid control circuit (Violet/White wire on BE/BR bodies; Gray/Black wire on DN body; Pink wire on all other bodies). If resistance is 2.5-5.0 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 5 ohms or less, perform TEST TC-171C: GOVERNOR PRESSURE SOLENOID/TRANS RELAY CIRCUITS . If resistance is more than 5 ohms, go to next step.
  15. Disconnect transmission 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.
  16. Check resistance of governor pressure solenoid control circuit (Violet/White wire on BE/BR bodies; Gray/Black wire on DN body; Pink wire on all other bodies) between PCM White connector and transmission solenoid connector. If resistance is more than 5 ohms, repair open governor pressure solenoid control 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 less, go to next step.
  17. Drain and remove transmission pan. Disconnect governor pressure 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.
  18. Check resistance across governor pressure solenoid terminals. If resistance is 5 ohms or less, replace transmission solenoid and harness assembly 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 more than 5 ohms, replace governor pressure solenoid 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.
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