DTC P2238

DTC P2238  : A/F Sensor (Sensor 1) IP 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. Enter the maintenance mode, then 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
   P2238 A/F Sensor (Sensor 1) IP 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 (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. Measure the resistance 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	PCM connector E (80P) No. 48
   Test point 2	Body ground

   Is there 1 MΩ or more?

   YES 

   Go to step 3.

   NO 

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

3. A/F sensor (Sensor 1) check

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

   -2. Reconnect all connectors.

   -3. Exit the SCS mode with the HDS.

   -4. Turn the vehicle to the ON mode.

   -5. Reset the PCM with the HDS .

   Reset PCM

   -6. Enter the maintenance mode, then start the engine .

   -7. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

   -8. Check for Pending or Confirmed DTCs with the HDS.

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

   Is DTC P2238 indicated?

   YES 

   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) .