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Home >> Jeep >> 1997 >> Wrangler Sahara, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4.0L >> Trouble Code Tests >> Test TC-15A - Speed Control Solenoid Circuits

Test TC-15A - Speed Control Solenoid Circuits

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.
  1. Using scan tool, actuate Speed Control (S/C) vent solenoid. If vent solenoid does not click, go to step 7). If vent solenoid clicks, go to next step.
  2. Wiggle wiring harness from S/C servo and brakelight switch to Powertrain Control Module (PCM). Ensure scan tool is still actuating S/C vent solenoid. If vent solenoid stops actuating while wiggling wiring harness, repair wiring as necessary and perform TEST VER-4A. If vent solenoid continues actuating, go to next step.
  3. Actuate S/C vacuum solenoid. If vacuum solenoid does not click, go to step 7). If vacuum solenoid clicks, go to next step.
  4. Wiggle wiring harness from S/C servo and brakelight switch to Powertrain Control Module (PCM). Ensure scan tool is still actuating S/C vacuum solenoid. If vacuum solenoid stops actuating while wiggling wiring harness, repair wiring as necessary and perform TEST VER-4A. If vacuum solenoid continues actuating, go to next step.
  5. Condition required to set DTC is not present at this time. SPEED CONTROL SOLENOID CIRCUITS DTC sets if Powertrain Control Module (PCM) actuates S/C vacuum and vent solenoids but they do not respond. Possible causes are: open or shorted solenoid control circuit, open or shorted S/C vacuum or vent solenoid, open or shorted S/C power supply circuit, or defective PCM. Go to next step.
  6. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-4A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
    NOTE: DO NOT depress brake pedal during following steps.
  7. Turn ignition on, engine off. Turn S/C switch on. Disconnect S/C servo 4-pin connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-4A. If connector and terminals are okay, go to next step.
  8. Using scan tool in voltmeter mode, check voltage on S/C servo 4-pin connector, switched S/C power supply circuit. If voltage is more than 10 volts, go to step 13). If voltage is 10 volts or less, go to next step.
  9. Turn ignition off. Using scan tool in ohmmeter mode, check resistance between ground and S/C servo 4-pin connector, switched S/C power supply circuit. If resistance is less than 5 ohms, repair short to ground in switched S/C power supply circuit and perform TEST VER-4A. If resistance is 5 ohms or more, go to next step.
  10. Disconnect brakelight switch connector. Turn ignition on, engine off. Using scan tool in voltmeter mode, check voltage on brakelight switch connector, S/C (ON/OFF switch sense) power supply circuit (Yellow/Red wire). If voltage is 10 volts or less, perform TEST TC-15B. If voltage is more than 10 volts, go to next step.
  11. 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-4A. If connectors and terminals are okay, go to next step.
  12. Using scan tool in ohmmeter mode, check resistance of switched S/C power supply circuit between PCM Gray connector and S/C servo 4-pin connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-4A. If resistance is 5 ohms or more, repair open switched S/C power supply circuit and perform TEST VER-4A.
  13. Turn ignition off. Using an external ohmmeter, check resistance between ground and S/C servo 4-pin connector, ground circuit (Black wire). If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
  14. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-4A. If connectors and terminals are okay, go to next step.
  15. Using an external ohmmeter, check resistance of S/C vacuum solenoid control circuit (Tan/Red wire) between PCM Gray connector and S/C servo 4-pin connector. If resistance is 5 ohms or more, repair open S/C vacuum solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
  16. Check resistance of S/C vent solenoid control circuit (Light Green/Red wire) between PCM Gray connector and S/C servo 4-pin connector. If resistance is 5 ohms or more, repair open S/C vent solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
  17. Check resistance between ground and S/C servo 4-pin connector,S/C vacuum solenoid control circuit (Tan/Red wire). If resistance is 5 ohms or more, repair short to ground in S/C vacuum solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
  18. Check resistance between ground and S/C servo 4-pin connector,S/C vent solenoid control circuit (Light Green/Red wire). If resistance is 5 ohms or more, repair short to ground in S/C vent solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, replace S/C servo and perform TEST VER-4A.
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