DTC DETECTION LOGIC To judge the malfunction of A/F sensor 1, this diagnosis measures response time of the A/F signal computed by ECM from the A/F sensor 1 signal. The time is compensated by engine operating (speed and load), fuel feedback control constant, and the A/F sensor 1 temperature index. Judgment is based on whether the compensated time (the A/F signal cycling time index) is inordinately long or not.

DTC No. | Trouble diagnosis name | DTC detecting condition | Possible Cause
P0133 | Air fuel ratio (A/F) sensor 1 (bank 1) circuit slow response |

- The response of the A/F signal computed by ECM from A/F sensor 1 signal takes more than the specified time.

- Harness or connectors
  (The A/F sensor 1 circuit is open or shorted.)
- A/F sensor 1
- A/F sensor 1 heater
- Fuel pressure
- Fuel injector
- Intake air leaks
- Exhaust gas leaks
- PCV
- Mass air flow sensor

P0153 | Air fuel ratio (A/F) sensor 1 (bank 2) circuit slow response

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.
Do you have CONSULT-III?
YES>>GO TO 2.
NO >>GO TO 5.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
With CONSULT-III

1. Start engine and warm it up to normal operating temperature.
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 at least 1minute under no load.
6. Let engine idle for 1 minute.
7. Select “A/F SEN1(B1) P1278/P1279” (for DTC P0133) or “A/F SEN1(B2) P1288/P1289” (for DTC P0153) of “A/F SEN1” in “DTC WORK SUPPORT” mode with CONSULT-III.
8. Touch “START”.

Is “COMPLETED” displayed on CONSULT-III screen?
YES>>GO TO 3
NO>>GO TO 4.
3.PERFORM DTC CONFIRMATION PROCEDURE-II
Touch “SELF-DIAG RESULT”.
Which is displayed on CONSULT-III screen?
OK>>INSPECTION END
NG>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).
4.PERFORM DTC CONFIRMATION PROCEDURE-II

1. After perform the following procedure, “TESTING” will be displayed on the CONSULT-III screen.

- Increase the engine speed up to between 4,000 and 5,000 rpm and maintain that speed for 10 seconds.
- Fully release accelerator pedal and then let engine idle for about 10 seconds.If “TESTING” is not displayed after 10 seconds, refer to Component Function Check (GT-R certified NISSAN dealer).

2. Wait for about 20 seconds at idle under the condition that “TESTING” is displayed on the CONSULT-III screen.
3. Check that “TESTING” changes to “COMPLETED”.If “TESTING” changed to “OUT OF CONDITION”, refer to Component Function Check (GT-R certified NISSAN dealer).
4. Touch “SELF-DIAG RESULT”.

Which is displayed on CONSULT-III screen?
OK>>INSPECTION END
NG>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).
5.CHECK AIR-FUEL RATIO SELF-LEARNING VALUE
With GST

1. Start engine and warm it up to normal operating temperature.
2. Select Service $01 with GST.
3. Calculate the total value of “Short term fuel trim” and “Long term fuel trim” indications.

Is the total percentage within ±15%?
YES>>GO TO 7.
NO>>GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.

- Intake air leaks
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Fuel injector
- Incorrect PCV hose connection
- PCV valve
- Mass air flow sensor

>>Repair or replace malfunctioning part.
7.PERFORM DTC CONFIRMATION PROCEDURE

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.
4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1minute under no load.
5. Let engine idle for 1 minute.
6. Increase the engine speed up to between 4,000 and 5,000 rpm and maintain that speed for 10 seconds.
7. Fully release accelerator pedal and then let engine idle for about 1 minute.
8. Check 1st trip DTC.

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