FixVault
Home › Acura › 2017 › RLX Base › Repair and Diagnosis › Engine Performance › System › Engine Control System - DTC Diagnostics (5 Of 6) (Except Hybrid) › DTC Troubleshooting › DTC P2123

DTC P2123

DTC P2123  : APP Sensor A (TP Sensor D) Circuit High 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
P2123 APP Sensor A (TP Sensor D) Circuit High 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 A More than 4.9 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 (APP sensor, 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 VCC3, SG3
    Test point 1 APP sensor 6P connector No. 4 (RED)
    Test point 2 APP sensor 6P connector No. 5 (BRN)
    GHH345213Courtesy of HONDA, U.S.A., INC.

    Is there about 5.0 V?

    YES 

    Replace the APP sensor , then do the repair verification.

    NO 

    Go to step 3.

  3. Open wire check (SG3 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. 5 (BRN)
    Terminal B Body ground
    GHH345214Courtesy 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. 5: jumped to body ground
      PCM connector A (51P): disconnected
    Test circuit SG3
    Test point 1 PCM connector A (51P) No. 43 (BRN)
    Test point 2 Body ground
    GHH345215Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The SG3 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 SG3 wire between the PCM (A43) and the APP sensor, then do the repair verification.

  4. 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
    P2123 APP Sensor A (TP Sensor D) Circuit High Voltage      

    DTC (PGM-FI)

    Is DTC P2123 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.

About FixVault