DTC P2238 (2.4 L Engine) (2017 2018 2019)

DTC P2238  : A/F Sensor (Sensor 1) AFS+ Circuit Low Voltage

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. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P2238 A/F Sensor (Sensor 1) AFS+ Circuit Low Voltage

   Is DTC P2238 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 A/F sensor (Sensor 1) 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 (AFS+ 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 connectors.

   PCM connector C (51P)

   A/F sensor (Sensor 1) 4P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector C (51P): disconnected
   	A/F sensor (Sensor 1) 4P connector: disconnected
   Test point 1	PCM connector C (51P) No. 48
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the AFS+ wire between the PCM (C48) and the A/F sensor (Sensor 1).

   NO 

   The AFS+ wire is OK. Go to step 3.

3. PCM internal circuit check

   -1. Reconnect PCM connector C (51P).

   -2. Exit the SCS mode with the HDS.

   -3. Turn the vehicle to the ON mode.

   -4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	A/F sensor (Sensor 1) 4P connector: disconnected
   Test point 1	A/F sensor (Sensor 1) 4P connector (female terminals) No. 2:
   Test point 2	Body ground

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

   Is there about 0.2 V or less?

   YES 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good PCM .

   NO 

   The PCM internal circuit is OK. Replace the A/F sensor (Sensor 1) .