A/T Interlock System - Key Interlock System Circuit Troubleshooting
SRS components are located in this area. Review the SRS component locations and the precautions and procedures before doing repair or service.
  1. Turn the ignition switch to ACCESSORY (I). The shift lever must be in P.
  1. Disconnect the steering lock assembly connector.
  1. Check if the ignition switch can be turned to LOCK (0).
Can the ignition switch be turned to LOCK (0)?
YES -
Go to Step 4 .
NO -
  1. Turn the ignition switch to LOCK (0).
  1. Move the shift lever out of P.
  1. Check for continuity between steering lock assembly connector terminal No. 3 and body ground.
Is there continuity?
YES -
Repair short to body ground in the wire between the key interlock solenoid and the driver's MICU.■
NO -
Go to Step 7 .
  1. Check for continuity between shift lever 6P connector terminal No. 1 and body ground.
Is there continuity?
YES -
Repair short to body ground in the wire between shift lever 6P connector terminal No. 1 and the driver's MICU.■
NO -
Go to Step 9 .
  1. Shift the shift lever into P.
  1. Check for continuity between shift lever 6P connector terminals No. 1 and No. 2. Do not push the shift lever button.
Is there continuity?
YES -
Replace the park pin switch; LHD model, RHD model. ■
NO -
Go to Step 11 .
  1. Disconnect driver's under-dash fuse/relay box connector F (33P).
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between driver's under-dash fuse/relay box connector F (33P) terminal No. 4 and body ground.
Is there about 0 V while the shift lever is in P, and is there battery voltage when the shift lever is out of P?
YES -
Substitute a known-good driver's MICU and recheck. If the symptom goes away with a known-good driver's MICU, replace the original MICU. ■
NO -
Repair open or short to body ground in the wire between PCM connector terminal; R20A3 engine model: B13, K24Z3 engine model: B14, the transmission range switch, and the driver's MICU.■