DTC P2121 (L15B7/L15BA/L15BY) (17-21)

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

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

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   Clear DTC

   -3. Wait 10 seconds or more.

   -4. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P2121 APP Sensor A (TP Sensor D) Out of Range

   Is DTC P2121 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 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 (APS1 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 6.

   NO 

   Go to step 3.

3. Shorted 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.

   SCS Short

   -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. 4:
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short in the VCC4 wire between the PCM (A45) and the APP sensor.

   NO 

   The VCC4 wire is not shorted. Go to step 4.

4. Open wire check (VCC4 line)

   -1. 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. 4:
   Test point 2	PCM connector A (50P) No. 45

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

   Is there continuity?

   YES 

   The VCC4 wire is OK. Go to step 5.

   NO 

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

5. Open wire check (SG4 line)

   -1. 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. 5:
   Test point 2	PCM connector A (50P) No. 46

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

   Is there continuity?

   YES 

   The SG4 wire is OK. Go to step 8.

   NO 

   Repair an open in the SG4 wire between the PCM (A46) and the APP sensor.

6. 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.

   SCS Short

   -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 7.

7. Open wire check (APS1 line)

   -1. 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	PCM connector A (50P) No. 32

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

   Is there continuity?

   YES 

   The APS1 wire is OK. Go to step 8.

   NO 

   Repair an open in the APS1 wire between the PCM (A32) and the APP sensor.

8. APP sensor check

   -1. Substitute a known-good accelerator pedal module .

   -2. Reconnect all connectors.

   -3. Exit the SCS mode with the HDS.

   SCS Open

   -4. Turn the vehicle to the ON mode.

   -5. Clear the DTC with the HDS.

   Clear DTC

   -6. Wait 10 seconds or more.

   -7. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P2121 APP Sensor A (TP Sensor D) Out of Range

   Is DTC P2121 indicated?

   YES 

   The APP sensor is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. If DTC P2121 goes away and the PCM was substituted, replace the original PCM .

   NO 

   Replace the original accelerator pedal module .