DTC P2138 (19-21 9-Speed A/T)

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

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems .

DTC (PGM-FI)

1. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Turn the vehicle to the OFF (LOCK) mode.

   - 4. Turn the vehicle to the ON mode.

   - 5. Press the accelerator pedal to the floor.

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

   DTC Description	Confirmed DTC	Pending DTC
   P2138 Accelerator Pedal Position (APP) Sensor A/B (Throttle Position (TP) Sensor D/E) Incorrect Voltage Correlation

   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.

   If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot - Refer to: How to Troubleshoot the Fuel and Emissions Systems .

2. Determine possible failure area (APP sensor, others)

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

   Signal	Current conditions
   	Values	Unit
   APP SENSOR A
   APP SENSOR B

   Are they the same voltage?

   YES 

   Go to step 3.

   NO 

   Replace the accelerator pedal module .

3. Determine possible failure area (PCM, others)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Jump the SCS line with the HDS, and wait more than 1 minute.

   - 3. Disconnect the following connector.

   PCM connector A (50P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (50P): disconnected
   Test point 1	PCM connector A (50P) No. 33 - Refer to: PCM Connector for Inputs and Outputs (19-21 9-Speed A/T)
   Test point 2	PCM connector A (50P) No. 34 - Refer to: PCM Connector for Inputs and Outputs (19-21 9-Speed A/T)

   Is there continuity?

   YES 

   Go to step 4.

   NO 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. - Refer to:

   PCM Removal and Installation (19-21 9-Speed A/T) .

   If DTC P2138 goes away and the PCM was substituted, replace the original PCM - Refer to:

   PCM Removal and Installation (19-21 9-Speed A/T) .

4. Shorted wire check (AP1 line to AP2 line)

   - 1. Disconnect the following connector.

   APP sensor 6P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (50P): disconnected
   	APP sensor 6P connector: disconnected
   Test point 1	PCM connector A (50P) No. 33 - Refer to: PCM Connector for Inputs and Outputs (19-21 9-Speed A/T)
   Test point 2	PCM connector A (50P) No. 34 - Refer to: PCM Connector for Inputs and Outputs (19-21 9-Speed A/T)

   Is there continuity?

   YES 

   Repair a short in the AP1 wire to the AP2 wire between PCM connector terminals A33 (AP1 line) and A34 (AP2 line).

   NO 

   The APS1 wire and the APS2 wire are OK. Replace the accelerator pedal module .