DTC P2121

DTC P2121  : APP Sensor A (TP Sensor D) Out of Range

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 Voltage	Less than 0.25	V

   Data List

   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 on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot .

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 (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.

   NO 

   Go to step 6.

3. Shorted wire check (APS1 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 (50P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	APP sensor 6P connector: disconnected
   	PCM connector A (50P): 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 APS1 wire between the PCM (A32) and the APP sensor.

   NO 

   The APS1 wire is not shorted. Go to step 4.

4. Open wire check (APS1 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
   	PCM connector A (50P): disconnected
   	APP sensor 6P connector No. 6: jumped to body ground
   Test point 1	PCM connector A (50P) No. 32
   Test point 2	Body ground

   Is there continuity?

   YES 

   The APS1 wire is OK. Go to step 5.

   NO 

   Repair an open in the APS1 wire between the PCM (A32) 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 (50P)

   -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. Exit the SCS mode with the HDS.

   -5. Turn the vehicle to the ON mode.

   -6. Check the parameter(s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   APP Sensor A Voltage	less than 0.25	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 .

   NO 

   Replace the accelerator pedal module .

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 (50P)

   -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
   	PCM connector A (50P): disconnected
   	APP sensor 6P connector No. 4: jumped to body ground
   Test point 1	PCM connector A (50P) No. 45

   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 .

   NO 

   Repair an open in the VCC4 wire between the PCM (A45) and the APP sensor.