A/T Interlock System - Shift Lock System Circuit Troubleshooting

  1. Press the brake pedal.
Are the brake lights ON?
YES -
Go to Step 2 .
NO -
Repair faulty brake light circuit.■
  1. Connect 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 Step 3 .
NO -
Repair engine speed or throttle position input.■
  1. Choose Shift Lock Solenoid Test in Miscellaneous Test Menu, and check that the shift lock solenoid operates with the HDS.
Does the shift lock solenoid work properly?
YES -
Shift lock system is OK. Check the shift lock mechanism if necessary.■
NO -
Go to Step 4 .
  1. Turn the ignition switch OFF.
  1. Disconnect the shift lock solenoid connector.
  1. Turn the ignition switch ON (II).
  1. Measure the voltage between No. 1 terminal of the shift lock solenoid connector and body ground.
Is there battery voltage?
YES -
Go to Step 7 .
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.■
  1. Shift the shift lever into the P position, and press the brake pedal.

  1. 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 .■
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.■