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DTC P2127

DTC P2127  : APP Sensor B (TP Sensor E) Circuit Low Voltage

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
P2127 APP Sensor B (TP Sensor E) Circuit Low Voltage      

DTC (PGM-FI)

  1. Problem verification

    -1. Turn the vehicle to the ON mode.

    -2. Check the parameter(s) below with the HDS.

    Signal Threshold Current conditions
    Values Unit Values Unit
    APP SENSOR B Less than 0.2 V    

    Do the current condition(s) match the threshold?

    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. Determine possible failure area (VCC4 line, others)

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

    -2. Disconnect the following connector.

    APP sensor 6P connector

    -3. Turn the vehicle to the ON mode.

    -4. Measure the voltage between test points 1 and 2.

    Test condition Vehicle ON mode
      APP sensor 6P connector: disconnected
    Test circuit VCC4, SG4
    Test point 1 APP sensor 6P connector No. 1 (GRN)
    Test point 2 APP sensor 6P connector No. 2 (PNK)
    GHH345221Courtesy of HONDA, U.S.A., INC.

    Is there about 5.0 V?

    YES 

    Go to step 3.

    NO 

    Go to step 6.

  3. Shorted wire check (APS2 line)

    -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
      APP sensor 6P connector: disconnected
      PCM connector A (51P): disconnected
    Test circuit APS2
    Test point 1 APP sensor 6P connector No. 3 (WHT)
    Test point 2 Body ground
    GHH345222Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short in the APS2 wire between the PCM (A46) and the APP sensor, then do the repair verification.

    NO 

    The APS2 wire is not shorted. Go to step 4.

  4. Open wire check (APS2 line)

    -1. Connect terminals A and B with a jumper wire.

    Terminal A APP sensor 6P connector No. 3 (WHT)
    Terminal B Body ground
    GHH345223Courtesy of HONDA, U.S.A., INC.

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

    Test condition Vehicle OFF (LOCK) mode
      APP sensor 6P connector: disconnected
      APP sensor 6P connector No. 3: jumped to body ground
      PCM connector A (51P): disconnected
    Test circuit APS2
    Test point 1 PCM connector A (51P) No. 46 (WHT)
    Test point 2 Body ground
    GHH345224Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The APS2 wire is OK. Go to step 5.

    NO 

    Repair an open in the APS2 wire between the PCM (A46) and the APP sensor, then do the repair verification.

  5. PCM internal circuit check

    -1. Reconnect the following connector.

    PCM connector A (51P)

    -2. Remove the jumper wire from the APP sensor 6P connector.

    -3. Connect terminals A and B with a jumper wire.

    Terminal A APP sensor 6P connector No. 1 (GRN)
    Terminal B APP sensor 6P connector No. 3 (WHT)
    GHH345225Courtesy of HONDA, U.S.A., INC.

    -4. Turn the vehicle to the ON mode.

    -5. Check the parameter(s) below with the HDS.

    Signal Threshold Current conditions
    Values Unit Values Unit
    APP SENSOR B Less than 0.2 V    

    Do the current condition(s) match the threshold?

    YES 

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

    NO 

    Replace the APP sensor , then do the repair verification.

  6. Open wire check (VCC4 line)

    -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. Connect terminals A and B with a jumper wire.

    Terminal A APP sensor 6P connector No. 1 (GRN)
    Terminal B Body ground
    GHH345226Courtesy of HONDA, U.S.A., INC.

    -5. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      APP sensor 6P connector: disconnected
      APP sensor 6P connector No. 1: jumped to body ground
      PCM connector A (51P): disconnected
    Test circuit VCC4
    Test point 1 PCM connector A (51P) No. 42 (GRN)
    Test point 2 Body ground
    GHH345227Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The VCC4 wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then do the repair verification.

    NO 

    Repair an open in the VCC4 wire between the PCM (A42) and the APP sensor, then do the repair verification.

  7. 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. Check for Pending or Confirmed DTCs with the HDS.

    DTC Description Confirmed DTC Pending DTC Freeze Frame
    P2127 APP Sensor B (TP Sensor E) Circuit Low Voltage      

    DTC (PGM-FI)

    Is DTC P2127 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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