A/T Interlock System - Shift Lock System Circuit Troubleshooting

1.Press the brake pedal.

Are the brake lights ON?


YES - Go to 2.


NO - Repair faulty brake light circuit.n


2.Connect the PGM Tester or the HDS. Check engine speed and throttle position in the A/T data list.

Is the engine speed at idle, and TPS about 0.5 V?


YES - Go to 3.


NO - Repair engine speed or throttle position input.n


3.Remove the center console and rear console.

4.Disconnect the shift lock solenoid connector.

5.Turn the ignition switch ON (II).

6.Measure the voltage between No. 1 terminal of the shift lock solenoid connector and body ground.

Is there battery voltage?


YES - Go to 6.


NO - Check for blown No. 21 fuse in the under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the shift lock solenoid connector and the under-dash fuse/relay box.n

7.Shift the shift lever into the [P] position, and press the brake pedal.

8.Measure the voltage between shift lock solenoid connector terminals while pressing the brake pedal.

Is there battery voltage?


YES - Check the shift lock mechanism. If the mechanism is OK, replace the  shift lock solenoid.n


NO - Check for an open in the wire between PCM connector terminal E2 and shift lock solenoid connector. If the wire is OK, substitute a known-good PCM and recheck.n