DTC Troubleshooting

Control System DTCs

DTC Troubleshooting: P2138

DTC P2138 : APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information How to Troubleshoot the Fuel And Emissions Systems.


1. Problem verification:

-1. Turn the ignition switch to ON (II).

-2. Clear the DTC with the HDS. How to Troubleshoot the Fuel And Emissions Systems

-3. Press the accelerator pedal to the floor.

-4. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2138 indicated?
-YES- The failure is duplicated. Go to step 2.
-NO- Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the APP sensor and the PCM.

2. APP sensor signal check:

-1. Check the parameter(s) below with the HDS.






Are they the same voltage?
-YES- Go to step 3.
-NO- Replace the APP sensor Service and Repair, then do the repair verification.

3. Determine possible failure area (PCM, others):

-1. Turn the ignition switch to LOCK (0)

-2. Jump the SCS line with the HDS.

-3. Disconnect the following connector.






-4. Check for continuity between test points 1 and 2.










Is there continuity?
-YES- Go to step 4.
-NO- Update the PCM PCM Update if it does not have the latest software, or substitute a known-good PCM Service and Repair, then do the repair verification.

4. Shorted wire check (APS1 line to APS2 line):

-1. Disconnect the following connector.






-2. Check for continuity between test points 1 and 2.










Is there continuity?
-YES- Repair a short in the APS1, APS2 wires between PCM connector terminals A28 (APS1 line) and A29 (APS2 line), then do the repair verification.
-NO- The APS1 and APS2 wires are OK. Replace the APP sensor Service and Repair, then do the repair verification.

Repair verification:

-1. Turn the ignition switch to LOCK (0).

-2. Reconnect all connectors.

-3. Turn the ignition switch to ON (II).

-4. Reset the PCM with the HDS How to Troubleshoot the Fuel And Emissions Systems.

-5. Do the PCM idle learn procedure PCM Idle Learn Procedure.

-6. Turn the ignition switch to LOCK (0).

-7. Turn the ignition switch to ON (II).

-8. Press the accelerator pedal to the floor.

-9. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2138 indicated?
-YES- Check for poor connections or loose terminals at the APP sensor and the PCM. If the PCM was updated, substitute a known-good PCM Service and Repair. then recheck. If the PCM was substituted, go to step 1.
-NO- Troubleshooting is complete. If the PCM was substituted, replace the original PCM Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.