PSP Switch Signal Circuit Troubleshooting: Notes

Start the engine, and let it idle.
Align the steering wheel straight ahead.
Check the PSP SWITCH in the DATA LIST with the HDS.
Does it indicate ON?

YES -Go to step 4.

NO -Go to step 14.
Turn the steering wheel to the full lock position.
Check the PSP SWITCH in the DATA LIST with the HDS.
Does it change to OFF?

YES -The PSP switch signal circuit is OK.

NO -Go to step 6.
Turn the ignition switch to LOCK (0).
Disconnect the PSP switch 2P connector.
Start the engine.
Check the PSP SWITCH in the DATA LIST with the HDS.
Does it change to OFF?

YES -Replace the PSP switch (see POWER STEERING HOSE, LINE, AND PRESSURE SWITCH REPLACEMENT ).

NO -Go to step 10.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (49P).
Check for continuity between PSP switch 2P connector terminal No. 1 and body ground.

Fig 1: Checking Continuity Between PSP Switch Connector Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair short in the wire between the ECM/PCM (A23) and the PSP switch.

NO -Update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).
Turn the ignition switch to LOCK (0).
Disconnect the PSP switch 2P connector.
Connect PSP switch 2P connector terminals No. 1 and No. 2 with a jumper wire, then start the engine.

Fig 2: Identifying PSP Switch Connector Terminals And Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check the PSP SWITCH in the DATA LIST with the HDS.
Does it change to ON?

YES -Replace the PSP switch (see POWER STEERING HOSE, LINE, AND PRESSURE SWITCH REPLACEMENT ).

NO -Go to step 18.
Turn the ignition switch to LOCK (0).
Remove the jumper wire from the PSP switch 2P connector.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (49P).
Connect PSP switch 2P connector terminal No. 1 to body ground with a jumper wire.

Fig 3: Identifying PSP Switch Connector Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between ECM/PCM connector terminal A23 and body ground.

Fig 4: Checking Continuity Between ECM/PCM Connector Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 24.

NO -Repair open in the wire between the PSP switch and the ECM/PCM (A23).
Check for continuity between PSP switch 2P connector terminal No. 2 and body ground.

Fig 5: Checking Continuity Between PSP Switch Connector Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).

NO -Repair open in the wire between the PSP switch and G201 (see RIGHT ENGINE COMPARTMENT WIRE HARNESS ).