DTC P2138

DTC 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. 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. 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 .

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) - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016), or How to Troubleshoot the A/T System (2014 2015)

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (51P): disconnected
   Test circuit	AP1, AP2
   Test point 1	PCM connector A (51P) No. 45 (GRN)
   Test point 2	PCM connector A (51P) No. 46 (PNK)

   Courtesy 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 - Refer to: PCM Removal and Installation (2014 2015), or PCM Removal and Installation (2016) .

4. Shorted wire check (AP1 line to AP2 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	AP1, AP2
   Test point 1	PCM connector A (51P) No. 45 (GRN)
   Test point 2	PCM connector A (51P) No. 46 (PNK)

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

   Is there continuity?

   YES 

   Repair a short in the AP1 wire to the AP2 wire between PCM connector terminals A45 (AP1 line) and A46 (AP2 line).

   NO 

   The AP1 and AP2 wires are OK. Replace the APP sensor .