DTC P2122

DTC P2122 : APP Sensor A (TP Sensor D) Circuit Low Voltage

NOTE: Before you troubleshoot, review the general troubleshooting information - 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) .

DTC Description	Confirmed DTC	Pending DTC
P2122 APP Sensor A (TP Sensor D) Circuit Low Voltage

DTC (PGM-FI)

Problem verification

-1. Turn the vehicle to the ON mode.

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

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

Do the current condition(s) match the threshold?

YES

The failure is duplicated. Go to step 2.

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 on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot - Refer to: How to Troubleshoot the A/T System (2014 2015), or 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) .

Determine possible failure area (VCC3 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 (female terminals) No. 4:
Test point 2	APP sensor 6P connector (female terminals) No. 5:

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

Is there about 5.0 V?

YES

Go to step 3.

Go to step 6.

Shorted wire check (AP1 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 (female terminals) No. 6:
Test point 2	Body ground

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

Is there continuity?

YES

Repair a short in the AP1 wire between the PCM (A45) and the APP sensor.

The AP1 wire is not shorted. Go to step 4.

Open wire check (AP1 line)

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

Terminal A	APP sensor 6P connector (female terminals) No. 6:
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. 6: jumped to body ground
	PCM connector A (51P): disconnected
Test point 1	PCM connector A (51P) No. 45 - Refer to: PCM Connector for Inputs and Outputs (2014 2015), or PCM Connector for Inputs and Outputs (2016), or PCM Connector for Inputs and Outputs (2017 2018 2019 2020)
Test point 2	Body ground

Is there continuity?

YES

The AP1 wire is OK. Go to step 5.

Repair an open in the AP1 wire between the PCM (A45) and the APP sensor.

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 (female terminals) No. 4:
Terminal B	APP sensor 6P connector (female terminals) No. 6:

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
Signal	Values	Unit	Values	Unit
APP SENSOR A	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 (2016), or PCM Removal and Installation (2014 2015) .

Replace the APP sensor .

Open wire check (VCC3 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 (female terminals) No. 4:
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. 4: jumped to body ground
	PCM connector A (51P): disconnected

Test point 1	PCM connector A (51P) No. 41 - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020), or PCM Connector for Inputs and Outputs (2014 2015), or PCM Connector for Inputs and Outputs (2016)
Test point 2	Body ground

Is there continuity?

YES

The VCC3 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 (2014 2015), or PCM Removal and Installation (2016) .

Repair an open in the VCC3 wire between the PCM (A41) and the APP sensor.