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DTC P2127 (6-Speed A/T, 16-18 9-Speed A/T)

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

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

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.

    If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot - Refer to:

    How to Troubleshoot the Fuel and Emissions Systems .

  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 point 1 APP sensor 6P connector No. 1
    Test point 2 APP sensor 6P connector No. 2
    GHH307959Courtesy 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 (AP2 line)

    - 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 (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 point 1 APP sensor 6P connector No. 3
    Test point 2 Body ground
    GHH307960Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short in the AP2 wire between the PCM (A46) and the APP sensor.

    NO 

    The AP2 wire is not shorted. Go to step 4.

  4. Open wire check (AP2 line)

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

    Terminal A APP sensor 6P connector No. 3
    Terminal B Body ground
    GHH307961Courtesy 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 point 1 PCM connector A (51P) No. 46 - Refer to:
    PCM Connector for Inputs and Outputs (16-18 9-Speed A/T), or
    PCM Connector for Inputs and Outputs (16-20 6-Speed A/T)
    Test point 2 Body ground

    Is there continuity?

    YES 

    The AP2 wire is OK. Go to step 5.

    NO 

    Repair an open in the AP2 wire between the PCM (A46) and the APP sensor.

  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
    Terminal B APP sensor 6P connector No. 3
    GHH307962Courtesy 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 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good PCM - Refer to: PCM Removal and Installation (6-Speed A/T, 16-18 9-Speed A/T) .

    NO 

    Replace the APP sensor .

  6. Open wire check (VCC4 line)

    - 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 (51P)

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

    Terminal A APP sensor 6P connector No. 1
    Terminal B Body ground
    GHH307963Courtesy 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 point 1 PCM connector A (51P) No. 42 - Refer to:
    PCM Connector for Inputs and Outputs (16-20 6-Speed A/T), or
    PCM Connector for Inputs and Outputs (16-18 9-Speed A/T)
    Test point 2 Body ground

    Is there continuity?

    YES 

    The VCC4 wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good PCM - Refer to:

    PCM Removal and Installation (6-Speed A/T, 16-18 9-Speed A/T) .

    NO 

    Repair an open in the VCC4 wire between the PCM (A42) and the APP sensor.

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