Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC Confirmation Procedure
- PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
- Turn ignition switch OFF and wait at least 10 seconds.
- Turn ignition switch ON.
- Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
>>
GO TO 2.
- PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
- Start engine and warm it up to normal operating temperature.
- Let engine idle for 2 minutes.
- Check 1st trip DTC.
Is DTC P2239 detected?
>>
Proceed to Diagnosis Procedure .
>>
With CONSULT : GO TO 3.
>>
Without CONSULT : GO TO 7.
- CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
With CONSULT
- Start engine and warm it up to normal operating temperature.
- On CONSULT screen, select "ENGINE">>"Data Monitor">>"A/F SEN1 (B1)" or "A/F SEN1 (B2)".
- Check "A/F SEN1 (B1)" or "A/F SEN1 (B2)" indication.
Does the indication fluctuate around 2.2 V?
>>
GO TO 4.
>>
Proceed to Diagnosis Procedure .
- PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-I
- On CONSULT screen, select "ENGINE">>"DTC Work Support">>"A/F SEN1">>"A/F SEN1 (B1) P1276" (for DTC P2239).
- Touch "START".
- When the following conditions are met, "TESTING" will be displayed on the CONSULT screen.
ENG SPEED 1, 000 - 3, 200 RPM VHCL SPEED SE More than 64 km/h (40 mph) B/FUEL SCHDL 1.0 - 10.0 msec Selector lever D position If "TESTING" is not displayed after 20 seconds, retry from step 2.
CAUTION:Always drive vehicle at a safe speed.
Is "TESTING" displayed on CONSULT screen?
>>
GO TO 5.
>>
Check A/F sensor 1 function again. GO TO 3.
- PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-II
Release accelerator pedal fully.
NOTE:Never apply brake when releasing the accelerator pedal.
Which does "TESTING" change to?
COMPLETED>>
GO TO 6.
OUT OF CONDITION>>
Retry DTC CONFIRMATION PROCEDURE. GO TO 4.
- PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-III
Touch "SELF-DIAG RESULT".
Is "OK" displayed on CONSULT screen?
>>
To check malfunction symptom before repair: Refer to Intermittent Incident .
>>
Confirmation after repair: INSPECTION END
>>
Proceed to Diagnosis Procedure .
- PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B NOTE:
With GST
- Start engine and warm it up to normal operating temperature.
- Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in the suitable gear position.
- Shift the selector lever to D position, then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH).CAUTION:
Always drive vehicle at a safe speed.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.