DTC P2A01 (1.5 L Engine)

DTC P2A01  : Secondary HO2S (Sensor 2) Circuit Range/Performance Problem

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

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Start the engine, and let it idle for 10 seconds or more.

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

   DTC Description	Confirmed DTC	Pending DTC
   P2A01 Secondary HO2S (Sensor 2) Circuit Range/Performance Problem

   Is DTC P2A01 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 secondary HO2S (Sensor 2) 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. Shorted wire check (SO2 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
   	Secondary HO2S (Sensor 2) 4P connector: disconnected
   	PCM connector A (50P): disconnected
   Test point 1	Secondary HO2S (Sensor 2) 4P connector (male terminals) No. 1:
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short in the SO2 wire between the PCM (A47) and secondary HO2S (Sensor 2).

   NO 

   The SO2 wire is not shorted. Go to step 3.

3. Open wire check (SO2 line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Secondary HO2S (Sensor 2) 4P connector: disconnected
   	PCM connector A (50P): disconnected
   Test point 1	Secondary HO2S (Sensor 2) 4P connector (male terminals) No. 1:
   Test point 2	PCM connector A (50P) No. 47

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

   Is there continuity?

   YES 

   The SO2 wire is OK. Go to step 4.

   NO 

   Repair an open in the SO2 wire between the PCM (A47) and secondary HO2S (Sensor 2).

4. Shorted wire check (SO2 SG/SO2SG line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Secondary HO2S (Sensor 2) 4P connector: disconnected
   	PCM connector A (50P): disconnected
   Test point 1	Secondary HO2S (Sensor 2) 4P connector (male terminals) No. 2:
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short in the SO2 SG/SO2SG wire between the PCM (A48) and secondary HO2S (Sensor 2).

   NO 

   The SO2 SG/SO2SG wire is not shorted. Go to step 5.

5. Open wire check (SO2 SG/SO2SG line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Secondary HO2S (Sensor 2) 4P connector: disconnected
   	PCM connector A (50P): disconnected
   Test point 1	Secondary HO2S (Sensor 2) 4P connector (male terminals) No. 2:
   Test point 2	PCM connector A (50P) No. 48

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

   Is there continuity?

   YES 

   The SO2 SG/SO2SG wire is OK. Go to step 6.

   NO 

   Repair an open in the SO2 SG/SO2SG wire between the PCM (A48) and secondary HO2S (Sensor 2).

6. Secondary HO2S (Sensor 2) check

   -1. Substitute a known-good secondary HO2S (Sensor 2) .

   -2. Reconnect all connectors.

   -3. Exit the SCS mode with the HDS.

   -4. Turn the vehicle to the ON mode.

   -5. Clear the DTC with the HDS.

   -6. Wait 10 seconds or more.

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

   DTC Description	Confirmed DTC	Pending DTC
   P2A01 Secondary HO2S (Sensor 2) Circuit Range/Performance Problem

   Is DTC P2A01 indicated?

   YES 

   Secondary HO2S (Sensor 2) is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

   NO 

   Replace original secondary HO2S (Sensor 2) .