 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. - 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.Do you have CONSULT-III? YES >>GO TO 2. NO >>GO TO 5.
 2.PERFORM DTC CONFIRMATION PROCEDURE-I
With CONSULT-III
- Start engine and warm it up to normal operating temperature.
- Turn ignition switch OFF and wait at least 10 seconds.
- Turn ignition switch ON.
- Turn ignition switch OFF and wait at least 10 seconds.
- Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1minute under no load.
- Let engine idle for 1 minute.
- 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.
- Touch “START”.
Is “COMPLETED” displayed on CONSULT-III screen?
YES >>GO TO 3NO >>GO TO 4.
 3.PERFORM DTC CONFIRMATION PROCEDURE-II
 4.PERFORM DTC CONFIRMATION PROCEDURE-II
 5.CHECK AIR-FUEL RATIO SELF-LEARNING VALUE
With GST
- Start engine and warm it up to normal operating temperature.
- Select Service $01 with GST.
- 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
- Turn ignition switch OFF and wait at least 10 seconds.
- Turn ignition switch ON.
- Turn ignition switch OFF and wait at least 10 seconds.
- Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1minute under no load.
- Let engine idle for 1 minute.
- 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 1 minute.
- Check 1st trip DTC.
Is 1st trip DTC detected?
YES >>Go to Diagnosis Procedure (GT-R certified NISSAN dealer). NO >>INSPECTION END
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