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Home >> Acura >> 1990 >> Integra LS, 2D Hatchback, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - RO >> System Testing >> Shift & Key Interlock Systems >> Shift Interlock System
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

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, go to next step. If shift lever cannot be moved from Park, check for proper installation of shift lock solenoid. See SHIFT LOCK SOLENOID  under REMOVAL & INSTALLATION.
  3. Disconnect 8-pin connector from interlock control unit. Interlock control unit is located behind center of instrument panel. See Figure.
  4. Turn ignition on and depress brake pedal. Using voltmeter, check voltage between White/Red 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 voltage between White/Red wire of 8-pin connector and ground. Battery voltage should not exist.
  6. If voltage readings in step  4 and  5 are as specified, go to step  8. If voltage readings are not as specified, check for defective No. 37 fuse (20-amp) 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 appropriate 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 continuity between Green/White wire of 8-pin connector and ground. Continuity should exist. If continuity exists, go to step  11.
  9. If continuity does not exist, check shift position console switch. See SHIFT POSITION CONSOLE SWITCH  under COMPONENT TESTING. If shift position console switch is okay, check for defective wiring or ground connection G301 or G401.
  10. Ground connection G301 is located at front corner of engine compartment, on inner fender panel. Ground connection G401 is located behind driver's side of instrument panel, above kick panel. See Fig 1.
  11. Ensure ignition is on. Using voltmeter, check voltage between Yellow/Black wire of 8-pin connector and ground. If battery voltage exists, wiring circuit is okay.
  12. If battery voltage does not exist, check No. 23 fuse (7.5-amp) in fuse box on driver's side of instrument panel, near kick panel. If fuse is okay, check wiring circuit. If wiring circuit is okay, check shift lock solenoid. See SHIFT LOCK SOLENOID  under COMPONENT TESTING.
Fig 1: Identifying Ground Connection (1 of 2)
G93G23479Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 2: Identifying Ground Connection (2 of 2)
G93J23480Courtesy of AMERICAN HONDA MOTOR CO., INC.
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