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Test TC-15A: Speed Control Power Relay Circuit, S/C 12V Driver Circuit & Speed Control Solenoid Circuits

WARNING: This page is about a different car, the 1998 Plymouth Breeze, 1998 Dodge Stratus, and 1998 Chrysler Cirrus. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagram, refer to WIRING DIAGRAMS  .
  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 8).
  2. 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 SC-VER  .
  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 8).
  4. 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 SC-VER  .
  5. Condition to set trouble code is not present at this time. If SPEED CONTROL SOLENOID CIRCUITS DTC and/or S/C 12V DRIVER CIRCUIT DTC is being diagnosed, go to next step. SPEED CONTROL POWER RELAY CIRCUIT DTC sets when speed control power supply circuit is either open or shorted to ground. Possible causes are: open or shorted power supply circuit or failed speed control vent solenoid. Go to step 7).
  6. SPEED CONTROL SOLENOID CIRCUITS DTC and/or S/C 12V DRIVER CIRCUIT 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.
  7. Inspect all related wiring and connectors and repair as necessary. If related wiring and connectors were repaired, Perform TEST SC-VER  . If no problems were found with wiring and connectors, test is complete. Perform TEST SC-VER  .
  8. 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 12).
  9. 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 SC-VER  .
  10. 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  .
  11. 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 (Black/Tan wire). See BRAKE SWITCH CONNECTOR WIRE IDENTIFICATION table. If resistance is less than 5 ohms, replace PCM. Perform TEST SC-VER  . If resistance is 5 ohms or more, repair open speed control power supply circuit. Perform TEST SC-VER  .
  12. Using an ohmmeter, check resistance of speed control servo 4-pin connector (Black/Tan wire) to ground. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open Black/Tan wire. Perform TEST SC-VER  .
  13. 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 WIRE 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 SC-VER  .
  14. Using an ohmmeter, check resistance of speed control vent solenoid control circuit Light Green/Red wire between PCM connector terminal No. 80 and speed control servo 4-pin connector. 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 SC-VER  .
  15. 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 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 speed control vacuum solenoid control circuit. Perform TEST SC-VER  .
  16. Using an ohmmeter, check resistance of speed control vent solenoid control circuit between speed control servo 4-pin connector (Light Green/Red wire) and ground. If resistance is less than 5 ohms, repair short to ground on speed control vent solenoid control circuit. Perform TEST SC-VER  . If resistance is 5 ohms or more, replace speed control servo. Perform TEST SC-VER  .
SPEED CONTROL SERVO CONNECTOR WIRE IDENTIFICATION

Application Wire Color
Brake Switch Output Circuit Dark Blue/Red
Speed Control Vacuum Solenoid Control Circuit White/Violet
BRAKE SWITCH CONNECTOR WIRE IDENTIFICATION

Application Wire Color
Speed Control Power Supply Circuit Yellow/Pink
PCM CONNECTOR WIRE IDENTIFICATION

Application Wire Color
PCM Terminal No. 56 (Speed Control Vacuum Solenoid Control Circuit) White/Violet
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