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Shift Interlock System

  1. To check system operation, ensure shift lever is in Park. Turn ignition on. Depress brake pedal with accelerator pedal in idle position.
  2. If shift lock solenoid clicks, system is working properly. If shift lock solenoid fails to click, proceed to step 3). If shift lever cannot be moved from Park, check for proper installation procedure of shift lock solenoid. See SHIFT LOCK SOLENOID  under REMOVAL & INSTALLATION in this article.
  3. Disconnect 8-pin connector from interlock control unit. Interlock control unit is located behind passenger's side of instrument panel and contains an 8-pin connector. See Figure .
  4. Turn ignition on and depress brake pedal. Using voltmeter, check for battery voltage at White/Green wire of 8-pin connector and ground. Battery voltage should exist.
  5. With brake pedal still depressed, depress accelerator pedal. Ensure brake pedal and accelerator are held down at the same time. Check for voltage at White/Green wire of 8-pin connector and ground. Battery voltage should not exist.
  6. If voltage is correct in steps 4) and 5), proceed to step 8). If voltage is not as specified in steps 4) and 5), check for defective No. 30 (20-amp) fuse in engine compartment fuse box. If fuse is okay, check for defective wiring.
  7. If wiring is okay, check for a defective brakelight switch or throttle angle sensor. Refer to the BRAKELIGHT SWITCH  and THROTTLE ANGLE SENSOR  under COMPONENT TESTING. If all components are okay, substitute ATCU and recheck operation.
  8. Ensure shift lever is in Park. Using ohmmeter, check for continuity between Green/White wire of 8-pin connector and ground. Continuity should exist. If continuity exists, proceed to step 10).
  9. If continuity does not exist, check shift position sensor. See SHIFT POSITION SENSOR  under COMPONENT TESTING. If shift position sensor is okay, check for defective wiring or ground connection at shift position sensor.
  10. Ensure ignition is on. Using voltmeter, check for battery voltage at Green wire of 8-pin connector and ground. Battery voltage should exist. If battery voltage exists, wiring circuit is okay.
  11. If battery voltage does not exist, check for defective No. 5 (10-amp) fuse in fuse box behind kick panel on driver's side. If fuse is okay, check for defective wiring circuit. If wiring circuit is okay, check shift lock solenoid. See SHIFT LOCK SOLENOID  under COMPONENT TESTING.
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