DTC Troubleshooting: P2238
DTC P2238: A/F Sensor (Sensor 1) AFS+ Circuit Low Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

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

1.
Problem verification:

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):

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:

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


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).?