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DTC 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 .
DTC Description Confirmed DTC Pending DTC Freeze Frame
P2138 APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation      

DTC (PGM-FI)

  1. Problem verification

    -1. Turn the vehicle to the ON mode.

    -2. Clear the DTC with the HDS.

    -3. Press the accelerator pedal to the floor.

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

    DTC Description Confirmed DTC Pending DTC Freeze Frame
    P2138 APP Sensor A/B (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.

  2. APP sensor signal check

    -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 APP sensor , then do the repair verification.

  3. Determine possible failure area (PCM, others)

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

    -2. Jump the SCS line with the HDS.

    -3. Disconnect the following connector.

    PCM connector A (51P)

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

    Test condition Vehicle OFF (LOCK) mode
      PCM connector A (51P): disconnected
    Test circuit APS1, APS2
    Test point 1 PCM connector A (51P) No. 45 (GRY)
    Test point 2 PCM connector A (51P) No. 46 (WHT)
    GHH345233Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Go to step 4.

    NO 

    Update the PCM if it does not have the latest software, or substitute a known-good PCM , then do the repair verification.

  4. Shorted wire check (APS1 line to APS2 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 (51P): disconnected
      APP sensor 6P connector: disconnected
    Test circuit APS1, APS2
    Test point 1 PCM connector A (51P) No. 45 (GRY)
    Test point 2 PCM connector A (51P) No. 46 (WHT)
    GHH345234Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short in the APS1 wire to the APS2 wire between PCM connector terminals A45 (APS1 line) and A46 (APS2 line), then do the repair verification.

    NO 

    The APS1 and APS2 wires are OK. Replace the APP sensor , then do the repair verification.

  5. Repair verification

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

    -2. Reconnect all connectors.

    -3. Exit the SCS mode with the HDS.

    -4. Turn the vehicle to the ON mode.

    -5. Reset the PCM with the HDS .

    Reset PCM

    -6. Do the PCM idle learn procedure .

    -7. Turn the vehicle to the OFF (LOCK) mode.

    -8. Turn the vehicle to the ON mode.

    -9. Press the accelerator pedal to the floor.

    -10.

    Check for Pending or Confirmed DTCs with the HDS.

    DTC Description Confirmed DTC Pending DTC Freeze Frame
    P2138 APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation      

    DTC (PGM-FI)

    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 , then recheck. If the PCM was substituted, go to step 1.

    NO 

    Troubleshooting is complete. If the PCM was substituted, replace the original PCM . If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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