PSP Switch Signal Circuit Troubleshooting (R18A)

PSP Switch Signal Circuit Troubleshooting

1.Start the engine, and let it idle.

2.Align the steering wheel straight ahead.

3.Check the PSP SWITCH in the DATA LIST with the HDS.

Does it indicate ON?


YES - Go to 4.


NO - Go to 14.


4.Turn the steering wheel to the full lock position.

5.Check the PSP SWITCH in the DATA LIST with the HDS.

Does it change to OFF?


YES - The PSP switch signal circuit is OK.n


NO - Go to 6.


6.Turn the ignition switch OFF.

7.Disconnect the PSP switch 2P connector.

8.Start the engine.

9.Check the PSP SWITCH in the DATA LIST with the HDS.

Does it change to OFF?


YES - Replace the PSP switch.n


NO - Go to 10.


10.Turn the ignition switch OFF.

11.Jump the SCS line with the HDS.

12.Disconnect ECM/PCM connector A (44P).

13.Check for continuity between PSP switch 2P connector terminal No. 1 and body ground.

 

Is there continuity?


YES - Repair short in the wire between the ECM/PCM (A22) and the PSP switch.n


NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.n


14.Turn the ignition switch OFF.

15.Disconnect the PSP switch 2P connector.

16.Connect PSP switch 2P connector terminals No. 1 and No. 2 with a jumper wire, then start the engine.

 

17.Check the PSP SWITCH in the DATA LIST with the HDS.

Does it change to ON?


YES - Replace the PSP switch.n


NO - Go to 18.


18.Turn the igniton switch OFF.

19.Remove the jumper wire from the PSP switch 2P connector.

20.Jump the SCS line with the HDS.

21.Disconnect ECM/PCM connector A (44P).

22.Connect PSP switch 2P connector terminal No. 1 to body ground with a jumper wire.

 

23.Check for continuity between body ground and ECM/PCM connector terminal A22.

 

Is there continuity?


YES - Go to 24.


NO - Repair open in the wire between the PSP switch and the ECM/PCM (A22).n


24.Check for continuity between PSP switch 2P connector terminal No. 2 and body ground.

 

Is there continuity?


YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.n


NO - Repair open in the wire between the PSP switch and body ground (LHD: G401, RHD: G201).n