DTC DETECTION LOGIC To judge the malfunction, the A/F signal computed by ECM from the A/F sensor 1 signal is monitored not to be shifted to LEAN side or RICH side.

DTC No. | Trouble diagnosis name | DTC detecting condition | Possible cause
P2A00 | Air fuel ratio (A/F) sensor 1 (bank 1) circuit range/performance |

- The output voltage computed by ECM from the A/F sensor 1 signal is shifted to the lean side for a specified period.

- The A/F signal computed by ECM from the A/F sensor 1 signal is shifted to the rich side for a specified period.

- A/F sensor 1
- A/F sensor 1 heater
- Fuel pressure
- Fuel injector
- Intake air leaks

P2A03 | Air fuel ratio (A/F) sensor 1 (bank 2) circuit range/performance

DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. 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.
2.PERFORM DTC CONFIRMATION PROCEDURE

1. Clear the mixture ratio self-learning value. Refer to Special Repair Requirement (GT-R certified NISSAN dealer).
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for 1 minute under no load.
6. Let engine idle for 1 minute.
7. Keep engine speed between 2,500 and 3,000 rpm for 20 minutes.
8. Check 1st trip DTC.

Is 1st trip DTC detected?
YES>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).
NO>>INSPECTION END