A/T Interlock System - Shift Lock System Circuit Troubleshooting
K24Z3 Engine Model
  1. Connect the HDS to the DLC (A) located under the driver's side of the dashboard.
  1. Make sure the HDS communicates with the PCM. If it does not, go to the DLC circuit troubleshooting.
  1. Select Shift Lock Solenoid Test in the Miscellaneous Test Menu, and check that the shift lock solenoid operates with the HDS.
Does the shift lock solenoid work properly?
YES -
Go to Step 15 .
NO -
Go to Step 4 .
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between shift lock solenoid connector terminal No. 1 and body ground.
Is there battery voltage?
YES -
Go to Step 8 .
NO -
Check for a blown No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box. If the fuse is OK, repair open or short in the wire between the shift lock solenoid connector and the driver's under-dash fuse/relay box.■
  1. Shift the shift lever into P, and press the brake pedal. Do not press the accelerator.
  1. Measure the voltage between shift lock solenoid connector terminals No. 1 and No. 2 while pressing the brake pedal.
Is there battery voltage?
YES -
Go to Step 10 .
NO -
Go to Step 11 .
  1. Release the brake pedal, and measure the voltage between shift lock solenoid connector terminals No. 1 and No. 2. The shift lever must be in P.
Is there battery voltage?
YES -
Repair short to body ground in the wire between PCM connector terminal A28 and the shift lock solenoid.■
NO -
Check the shift lock mechanism. If the mechanism is OK, replace the shift lock solenoid. ■
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect PCM connector A (49P).
  1. Check for continuity between PCM connector terminal A28 and shift lock solenoid connector terminal No. 2.
Is there continuity?
YES -
Substitute a known-good PCM and recheck. If the symptom goes away with a known-good PCM, replace the original PCM. ■
NO -
Repair open in the wire between PCM connector terminal A28 and the shift lock solenoid connector.■
  1. Press the brake pedal.
Are the brake lights ON?
YES -
Go to Step 16 .
NO -
Repair faulty brake light circuit.■
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect PCM connector A (49P).
  1. Measure the voltage between PCM connector terminal A42 and body ground when pressing the brake pedal and when the brake pedal is released.
Is there battery voltage when pressing the brake pedal, and about 0 V when the pedal is released?
YES -
Go to Step 21 .
NO -
Go to Step 20 .
  1. Check for continuity between PCM connector terminal A42 and brake pedal position switch 4P connector terminal No. 2.
Is there continuity?
YES -
Substitute a known-good PCM and recheck. If the symptom goes away with a known-good PCM, replace the original PCM. ■
NO -
Repair open in the wire between PCM connector terminal A42 and the brake pedal position switch.■
  1. Connect PCM connector A (49P).
  1. Disconnect the transmission range switch connector.
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between transmission range switch connector terminals No. 2 and No. 5.
Is there more than 5 V?
YES -
Go to Step 31 .
NO -
Go to Step 25 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect PCM connector B (49P).
  1. Check for continuity between PCM connector terminal B14 and body ground.
Is there continuity?
YES -
Repair short to body ground in the wire between PCM connector terminal B14 and the transmission range switch connector.■
NO -
Go to Step 29 .
  1. Check for continuity between PCM connector terminal B14 and transmission range switch connector terminal No. 2.
Is there continuity?
YES -
Go to Step 30 .
NO -
Repair open in the wire between PCM connector terminal B14 and the transmission range switch connector.■
  1. Check for continuity between transmission range switch connector terminal No. 5 and body ground.
Is there continuity?
YES -
Substitute a known-good PCM and recheck. If the symptom goes away with a known-good PCM, replace the original PCM. ■
NO -
Repair open in the wire between transmission range switch connector terminal No. 5 and body ground (G101), or repair poor ground (G101).■
Is the switch OK?
YES -
Go to Step 32 .
NO -
  1. Reconnect all connectors.
  1. Connect the HDS to the DLC.
  1. Check the APP SENSOR in the Data List with the HDS. Do not press the accelerator.
Is the accelerator pedal position sensor opening 5 % and above, or the sensor voltage 1.16 V and above?
YES -
NO -
Substitute a known-good PCM and recheck. If the symptom goes away with a known-good PCM, replace the original PCM. ■