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 SystemsHow to Troubleshoot the CVT System(CVT System) .

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.

• 2. Determine possible failure area (VCC5 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

  Courtesy 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, 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

  Courtesy of HONDA, U.S.A., INC.

  Is there continuity?

  YES 

  Repair a short in the APS2 wire between the PCM (A38) and the APP sensor.

  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
  Terminal B	Body ground

  Courtesy 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. 38
  Test point 2	Body ground

  Is there continuity?

  YES 

  The APS2 wire is OK. Go to step 5.

  NO 

  Repair an open in the APS2 wire between the PCM (A38) and the APP sensor.

• 5. PCM internal circuit check:

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

  - 2. Reconnect the following connector.

  PCM connector A (51P)

  - 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

  Courtesy 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 recheck. If DTC P2127 goes away and the PCM was updated, troubleshooting is complete. If DTC P2127 goes away and the PCM was substituted, replace the original PCM .

  NO 

  Replace the APP sensor (accelerator pedal module) .

• 6. Open wire check (VCC5 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

  Courtesy 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. 40
  Test point 2	Body ground

  Is there continuity?

  YES 

  The VCC5 wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P2127 goes away and the PCM was updated, troubleshooting is complete. If DTC P2127 goes away and the PCM was substituted, replace the original PCM .

  NO 

  Repair an open in the VCC5 wire between the PCM (A40) and the APP sensor.