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Test TC-15A - Speed Control Power Relay Circuit & Speed Control Solenoid Circuits

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION in TESTS W/CODES article in the ENGINE PERFORMANCE section. For wiring diagram, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE section.
  1. Turn Speed Control (SC) on. Using scan tool, actuate Speed Control (SC) vent solenoid. If SC servo clicks, go to next step. If SC servo does not click, go to step 8).
  2. Wiggle wiring harness between SC servo, brake switch and Powertrain Control Module (PCM). If wiggling did not cause an interruption of SC servo actuation, go to next step. If wiggling caused an interruption of SC servo actuation, repair wiring harness as necessary where wiggling caused problem to appear. Perform TEST SC-VER .
  3. Using scan tool, actuate SC vacuum solenoid. If SC servo clicks, go to next step. If SC vacuum solenoid does not click, go to step 8).
  4. Wiggle wiring harness between SC servo and brake switch to PCM while scan tool is still actuating SC vacuum solenoid. If wiggling did not cause an interruption of SC servo actuation, go to next step. If wiggling caused an interruption of SC 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 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 SC vent solenoid. Go to step 7).
  6. 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 open or shorted, 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. Perform TEST TC-15C .
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