PSP Switch Signal Circuit Troubleshooting

1.Turn the ignition switch ON (II).

2.Measure voltage between ECM/PCM connector terminals A24 and E16.

 

Is there less than 1.0 V?


YES - Go to 3.


NO - Go to 6.


3.Start the engine.

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

5.Measure voltage between ECM/PCM connector terminals A24 and E16.

Is there battery voltage?


YES - The PSP switch signal is OK.n


NO - Go to 13.


6.Turn the ignition switch OFF.

7.Disconnect the PSP switch 2P connector.

8.Turn the ignition switch ON (II).

9.At the harness side, connect PSP switch 2P connector terminals No. 1 and No. 2 with a jumper wire.

 

10.Measure voltage between ECM/PCM connector terminals A24 and E16.

Is there less than 1.0 V?


YES - Replace the  PSP switch.n


NO - Go to 11.


11.Turn the ignition switch OFF.

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

 

Is there continuity?


YES - Repair open in the wire between the  PSP switch and  ECM/ PCM (E16).n


NO - Repair open in the wire between the  PSP switch and  G301.n


13.Turn the ignition switch OFF.

14.Disconnect the PSP switch 2P connector.

15.Turn the ignition switch ON (II).

16.Measure voltage between ECM/PCM connector terminals A24 and E16.

 

Is there battery voltage?


YES - Replace the  PSP switch.n


NO - Go to 17.


17.Turn the ignition switch OFF.

18.Disconnect the negative cable from the battery.

19.Disconnect ECM/PCM connector E (31P).

20.Check for continuity between body ground and ECM/PCM connector terminal E16.

 

Is there continuity?


YES - Repair short in the wire between  ECM/ PCM (E16) and the  PSP switch.


NO - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original  ECM/ PCM.n