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Test TC-15A - Speed Control Solenoid Circuits

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION in SELF-DIAGNOSTICS section in this article. For wiring diagram, see WIRING DIAGRAMS - 2.7L article.
  1. Turn speed control (cruise control) on. Using scan tool, actuate speed control vent solenoid. If speed control servo clicks, go to next step. If speed control servo does not click, go to step 7).
  2. Scan tool should still be actuating speed control vent solenoid. Wiggle wiring harness between speed control servo, brake switch and Powertrain Control Module (PCM). If wiggling did not cause an interruption of speed control servo actuation, go to next step. If wiggling caused an interruption of speed control servo actuation, repair wiring harness as necessary where wiggling caused problem to appear. Perform TEST VER-4A.
  3. Using scan tool, actuate speed control vacuum solenoid. If speed control servo clicks, go to next step. If speed control vacuum solenoid does not click, go to step 7).
  4. Scan tool should still be actuating speed control vent solenoid. Wiggle wiring harness between speed control servo and brake switch to PCM while scan tool is still actuating speed control vacuum solenoid. If wiggling did not cause an interruption of speed control servo actuation, go to next step. If wiggling caused an interruption of speed control servo actuation, repair wiring harness as necessary where wiggling caused problem to appear. Perform TEST VER-4A.
  5. Condition to set trouble code is not present at this time. If SPEED CONTROL SOLENOID CIRCUITS DTC sets when PCM actuates vacuum and vent solenoids, but solenoids do not respond. Possible causes are: solenoid control circuit open or shorted, vacuum or vent solenoid shorted or open, open or shorted speed control power supply circuit or PCM failure. Go to next step.
  6. Inspect all related wiring and connectors and repair as necessary. If related wiring and connectors were repaired, perform TEST VER-4A. If no problems were found with wiring and connectors, test is complete. Perform TEST VER-4A.
  7. Disconnect speed control servo 4-pin connector. DO NOT depress brake pedal during testing. Turn ignition on with engine off. Turn speed control switch on. Using a voltmeter, check voltage of speed control servo 4-pin connector brake switch output circuit. See SPEED CONTROL SERVO CONNECTOR WIRE IDENTIFICATION table. If voltage is 10 volts or less, go to next step. If voltage is more than 10 volts, go to step 11).
  8. Turn ignition off. Using an ohmmeter, check resistance of speed control servo 4-pin connector brake switch output circuit to ground. See SPEED CONTROL SERVO CONNECTOR WIRE IDENTIFICATION table. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground on appropriate wire. Perform TEST VER-4A.
  9. Disconnect brake switch connector. Brake switch connector is located near top of brake pedal. Turn ignition on with engine off. Using a voltmeter, check voltage of brake switch connector speed control power supply circuit. See BRAKE SWITCH CONNECTOR WIRE IDENTIFICATION table. If voltage is 10 volts or less, go to next step. If voltage is more than 10 volts, perform TEST TC-15B.
  10. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an ohmmeter, check resistance of speed control power supply circuit between brake switch connector and PCM connector terminal No. 50. See BRAKE SWITCH CONNECTOR WIRE IDENTIFICATION table. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-4A. If resistance is 5 ohms or more, repair open speed control power supply circuit. Perform TEST VER-4A.
  11. Using an ohmmeter, check resistance of ground circuit between speed control servo 4-pin connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open ground circuit. Perform TEST VER-4A.
  12. Disconnect Powertrain Control Module (PCM) connectors. Using an ohmmeter, check resistance of speed control vacuum solenoid control circuit between speed control servo 4-pin connector and PCM connector terminal No. 56. See SPEED CONTROL SERVO CONNECTOR IDENTIFICATION table and PCM CONNECTOR WIRE IDENTIFICATION table. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open speed control vacuum solenoid control circuit. Perform TEST VER-4A.
  13. Using an ohmmeter, check resistance of speed control vent solenoid control circuit between PCM connector terminal No. 80 and speed control servo 4-pin connector. See SPEED CONTROL SERVO CONNECTOR IDENTIFICATION table and PCM CONNECTOR WIRE IDENTIFICATION table. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open speed control vent solenoid control circuit. Perform TEST VER-4A.
  14. Using an ohmmeter, check resistance of speed control vacuum solenoid control circuit between speed control servo 4-pin connector and ground. See SPEED CONTROL SERVO CONNECTOR IDENTIFICATION table. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground on speed control vacuum solenoid control circuit. Perform TEST VER-4A.
  15. Using an ohmmeter, check resistance of speed control vent solenoid control circuit between speed control servo 4-pin connector and ground. See SPEED CONTROL SERVO CONNECTOR IDENTIFICATION table. If resistance is less than 5 ohms, repair short to ground on speed control vent solenoid control circuit. Perform TEST VER-4A. If resistance is 5 ohms or more, replace speed control servo. Perform TEST VER-4A.
BRAKE SWITCH CONNECTOR WIRE IDENTIFICATION

Application Wire Color
Speed Control Power Supply Circuit Yellow/Red
Speed Control Brake Switch Output Circuit Dark Blue/Red
Brake Switch Sense Circuit White/Pink
Brake Switch Ground Circuit Black/Tan
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