DTC Troubleshooting: P2626
DTC P2626: A/F Sensor (Sensor 1) Circuit (LAF-CA, LAF-CP) Open Malfunction
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P2626 A/F Sensor (Sensor 1) Circuit (LAF-CA, LAF-CP) Open Malfunction
    

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 (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
P2626 A/F Sensor (Sensor 1) Circuit (LAF-CA, LAF-CP) Open Malfunction
    

Is DTC P2626 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 (LAF CA line):

Open wire check (LAF CA 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) 6P connector
PCM connector No. 1 (96P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
A/F sensor (Sensor 1) 6P connector: disconnected
 
PCM connector No. 1 (96P): disconnected
Test point 1
A/F sensor (Sensor 1) 6P connector (female terminals) No. 6:
Test point 2
PCM connector No. 1 (96P) No. 55


Is there continuity?

     
YES
     
     
     
The LAF CA wire is OK. Go to step 3.
     
NO
     
     
     
Repair an open in the LAF CA wire between PCM connector No. 1 terminal No. 55 and the A/F sensor (Sensor 1).?
3.
Open wire check (LAF CP line):

Open wire check (LAF CP line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
A/F sensor (Sensor 1) 6P connector: disconnected
 
PCM connector No. 1 (96P): disconnected
Test point 1
A/F sensor (Sensor 1) 6P connector (female terminals) No. 4:
Test point 2
PCM connector No. 1 (96P) No. 37


Is there continuity?

     
YES
     
     
     
The LAF CP wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the LAF CP wire between PCM connector No. 1 terminal No. 37 and the A/F sensor (Sensor 1).?
4.
A/F sensor (Sensor 1) check:

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.
Clear the DTC with the HDS.


?5.
Start the engine.

?6.
Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.

?7.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P2626 A/F Sensor (Sensor 1) Circuit (LAF-CA, LAF-CP) Open Malfunction
    

Is DTC P2626 indicated?

     
YES
     
     
     
The A/F sensor (Sensor 1) is OK. 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 P2626 goes away and the PCM was substituted, replace the original PCM.?
     
NO