A/T Interlock System - Shift Lock System Circuit Troubleshooting

KE, KG, and KS Models


1.Press the brake pedal.

Are the brake lights ON?


YES - Go to 2.


NO - Repair faulty brake light circuit.n


2.Turn the ignition switch ON (II).

3.With the accelerator pedal released, press the brake pedal.

4.Measure the voltage between PCM connector terminal E2 and body ground.

 

Is there battery voltage?


YES -

  • For KE and KG models: Check for an open in the wire between PCM connector terminal E2 and the multiplex control unit. If the wire is OK, check for a loose terminal fit in the multiplex control unit connectors. If necessary, substitute a known-good multiplex control unit and recheck.n
  • For KS model: Check for an open in the wire between PCM connector terminal E2 and the interlock control unit. If the wire is OK, check for a loose terminal fit in the interlock control unit connector. If necessary, substitute a known-good interlock control unit and recheck.n

NO - Go to 5.

5.Turn the ignition switch OFF.

6.Disconnect the battery negative terminal.

7.Disconnect PCM connectors A (31P) and E (31P).

8.Press the brake pedal, and measure the voltage between PCM connector terminals E22 and A8 or A9.

 

Is there battery voltage?


YES -

  • For KE and KG models: Release the brake pedal, and go to 10.
  • For KS model: Release the brake pedal, and go to 12.

NO - Repair open in the wire between PCM connector terminal E22 and the brake pedal position switch.n

9.Remove the under-dash fuse/relay box, and disconnect the No. 10 connector (13P) from the fuse/relay box.

10.Measure the voltage between the No. 3 terminal of the No. 10 connector (13P) and body ground while pressing the brake pedal.

 

Is there battery voltage?


YES - Release the brake pedal, and go to 11.


NO - Repair open or short in the wire between the multiplex control unit and the brake pedal position switch via the No. 3 terminal of the No. 10 connector (13P).n


11.Disconnect the battery negative terminal.

12.Connect PCM connectors A (31P) and E (31P).

13.Connect the No. 10 connector (13P) except for KS model.

14.Reconnect the battery negative terminal.

15.Disconnect the D3 switch/shift lock solenoid/park pin switch connector.

16.Turn the ignition switch ON (II).

17.With the accelerator pedal released, press the brake pedal, and measure the voltage between the No. 4 terminal of the D3 switch/shift lock solenoid/park pin switch connector and body ground.

 

Is there battery voltage?


YES - Go to 18.


NO - Repair open or short in the wire between the D3 switch/shift lock solenoid/park pin switch connector and under-dash fuse/relay box.n

18.Measure the voltage between the No.3 and No.4 terminals of the D3 switch/shift lock solenoid/park pin switch connector while pressing the brake pedal.

 

Is there battery voltage?


YES - Go to 19.


NO - Repair open in the wire between the D3 switch/shift lock solenoid/park pin switch connector and the multiplex control unit (KE and KG models) or interlock control unit (KS model).n

19.Connect the battery positive terminal to the No. 4 terminal of the D3 switch/shift lock solenoid/park pin switch connector, and connect the battery negative terminal to the No. 3 terminal. Check that the shift lock solenoid operates.

NOTE: Do not connect the battery positive terminal to the No. 3 terminal or you will damage the diode inside the shift lock solenoid.

 

Does the shift lock solenoid operate properly?


YES - Check that the shift lock mechanism works properly. If the mechanism does not work, repair or replace the shift lever assembly. If necessary,substitute a known-good multiplex control unit (KE and KG models) or interlock control unit (KS model) and recheck.n


NO - Replace the shift lock solenoid.n