DTC Troubleshooting: P2243
DTC P2243: A/F Sensor (Sensor 1) VCENT Circuit High Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P2243 A/F Sensor (Sensor 1) VCENT Circuit High Voltage
    

1.
Problem verification:

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 (CVT in P or N, M/T in neutral) 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
P2243 A/F Sensor (Sensor 1) VCENT Circuit High Voltage
   

Is DTC P2243 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.
Open wire check (VCENT line):

Open wire check (VCENT 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. 4:
Test point 2
PCM connector E (80P) No. 74


Is there continuity?

     
YES
     
     
     
The VCENT wire is OK. Go to step 3.
     
NO
     
     
     
Repair an open in the VCENT wire between the PCM (E74) and the A/F sensor (Sensor 1).?
3.
PCM internal circuit check:

PCM internal circuit check
?1.
Reconnect the following connector.
PCM connector E (80P)

?2.
Exit the SCS mode with the HDS.


?3.
Start the engine.

?4.
Hold the engine speed at 3,000 rpm without load (CVT in P or N, M/T in neutral) 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. 4:
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, then recheck. If DTC P2243 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).?