DTC P2237

DTC P2237  : A/F Sensor (Sensor 1) IP Circuit High Voltage

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Enter the maintenance mode, then start the engine .

   -5. Hold the engine speed at 3000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.

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

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

   DTC (PGM-FI)

   Is DTC P2237 indicated?

   YES 

   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. Open wire check (IP 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 E (80P)

   A/F sensor (Sensor 1) 6P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector E (80P): disconnected
   	A/F sensor (Sensor 1) 6P connector: disconnected
   Test point 1	A/F sensor (Sensor 1) 6P connector (female terminals) No. 5:
   Test point 2	PCM connector E (80P) No. 48

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

   Is there continuity?

   YES 

   Go to step 3.

   NO 

   Repair an open in the IP wire between the PCM (E48) and the A/F sensor (Sensor 1).

3. PCM internal circuit check

   -1. Reconnect the following connector.

   PCM connector E (80P)

   -2. Exit the SCS mode with the HDS.

   -3. Enter the maintenance mode, then start the engine .

   -4. Hold the engine speed at 3000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.

   -5. Measure the voltage between test points 1 and 2.

   Test condition	Engine running
   	A/F sensor (Sensor 1) 6P connector: disconnected
   Test point 1	A/F sensor (Sensor 1) 6P connector (female terminals) No. 5:
   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 , then recheck. If DTC P2237 goes away and the PCM was substituted, replace the original PCM .

   NO 

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