DTC P2237 (2.4 L Engine) (2017 2018 2019)

DTC P2237  : A/F Sensor (Sensor 1) AFS Circuit High 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. Start the engine.

   -4. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

   -5. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P2237 A/F Sensor (Sensor 1) AFS Circuit High Voltage

   Is DTC P2237 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), the relay circuit board (PGM-FI subrelay circuit), 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. Open 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.

   A/F sensor (Sensor 1) 4P connector

   PCM connector C (51P)

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

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

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

   Is there continuity?

   YES 

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

   NO 

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

3. Open wire check (AFS- line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	A/F sensor (Sensor 1) 4P connector: disconnected
   	PCM connector C (51P): disconnected
   Test point 1	A/F sensor (Sensor 1) 4P connector (female terminals) No. 1:
   Test point 2	PCM connector C (51P) No. 47

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

   Is there continuity?

   YES 

   The AFS- wire is OK. Go to step 4.

   NO 

   Repair an open in the AFS- wire between the PCM (C47) and the A/F sensor (Sensor 1).

4. A/F sensor (Sensor 1) check

   -1. Substitute a known-good A/F sensor (Sensor 1) .

   -2. Reconnect all connectors.

   -3. Turn the vehicle to the ON mode.

   -4. Reset the PCM with the HDS .

   Reset PCM

   -5. Do the PCM idle learn procedure .

   -6. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P2237 A/F Sensor (Sensor 1) AFS Circuit High Voltage

   Is DTC P2237 indicated?

   YES 

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

   NO 

   Replace the original A/F sensor (Sensor 1) .