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 HDS to the DLC.

3.Check engine speed and throttle position in the A/T data list with the HDS.

Is the engine speed at idle, and TPS about 5 V?


YES - Go to 4.


NO - Repair engine speed or throttle position input.n


4.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.n


NO - Go to 5.


5.With the accelerator pedal released, press the brake pedal, and measure the voltage between PCM connector terminal E2 and body ground.

 

Is there battery voltage?


YES - Go to 6.


NO - Go to 10.

6.Turn the ignition switch OFF.

7.Disconnect PCM connector E (31P).

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

9.Check for continuity between PCM connector terminal E2 and No. 13 terminal of the No. 10 connector (13P).

 

Is there continuity?


YES - Check for a loose terminal fit in the multiplex integrated control unit connectors. If necessary, substitute a known-good MICU and recheck.n


NO - Repair open in the wire between PCM connector terminal E2 and the multiplex integrated control unit via the No. 13 terminal of the No. 10 connector (13P).n

10.Turn the ignition switch OFF.

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

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

 

Is there battery voltage?


YES - Release the brake pedal, then go to 13.


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

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

14.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, then go to 15.


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

15.Connect PCM connectors A (31P) and E (31P), and connect the No. 10 connector (13P).

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

17.Turn the ignition switch ACC (I).

18.Measure the voltage between D3 switch/shift lock solenoid/park pin switch connector terminal No. 4 and body ground.

 

Is there battery voltage?


YES - Go to 19.


NO - Check for blown No. 8 (7.5A) fuse in the under-dash fuse/relay box. If the fuse is OK, 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

19.Shift the shift lever into the P position, and press the brake pedal. Do not press the accelerator.

20.Measure the voltage between D3 switch/shift lock solenoid/park pin switch connector terminals No. 3 and No. 4.

 

Is there battery voltage?


YES - Test the shift lock solenoid . If the shift lock solenoid or solenoid harness is faulty, replace the shift lock solenoid.n


NO - Check for poor or loose MICU connector terminal, and check for an open in the wire between the MICU and D3 switch/shift lock solenoid/park pin switch connector. If the connection and wire is OK, substitute a known-good MICU and recheck.n