P2096
P2096, P2097, P2098, P2099 A/F SENSOR 1
DTC Logic
DTC DETECTION LOGIC
To judge the malfunction, the A/F signal computed by ECM from the A/F sensor 1 signal is monitored so it will not shift to LEAN side or RICH side.
DTC CONFIRMATION PROCEDURE
1. PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following 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 "Work Procedure" Work Procedure.
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- Proceed to "Diagnosis Procedure" .
NO- INSPECTION END
Diagnosis Procedure
1. RETIGHTEN A/F SENSOR 1 AND HEATED OXYGEN SENSOR 2
Loosen and retighten the A/F sensor 1 and heated oxygen sensor 2. Refer to "Exploded View" Exploded View.
Revision: March 20122013 Infiniti JX
- GO TO 2.
2. CHECK FOR EXHAUST GAS LEAK
1.Start engine and run it at idle.
2.Listen for an exhaust gas leak before the three way catalyst 2.
Is exhaust gas leak detected?
YES- Repair or replace.
NO- GO TO 3.
3. CHECK FOR INTAKE AIR LEAKAGE
1.Start engine and run it at idle.
2.Listen for an intake air leakage after the mass air flow sensor.
Is intake air leakage detected?
YES- GO TO 4.
NO- Repair or replace malfunctioning part.
4. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
1.Clear the mixture ratio self-learning value. Refer to "Work Procedure" Work Procedure.
2.Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine?
YES- Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to "DTC Logic" P0171
or "DTC Logic" P0172.
NO- GO TO 5.
5. CHECK HARNESS CONNECTOR
1.Turn ignition switch OFF.
2.Disconnect A/F sensor 1 harness connector.
3.Check harness connector for water.
Water should not exit.
Is the inspection result normal?
YES- GO TO 6.
NO- Repair or replace harness connector.
6. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY
1.Disconnect A/F sensor 1 harness connector.
2.Turn ignition switch ON.
3.Check the voltage between A/F sensor 1 harness connector and ground.
Is the inspection result normal?
YES- GO TO 8.
NO- GO TO 7.
7. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1.Turn ignition switch OFF.
2.Disconnect IPDM E/R harness connector.
3.Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.
Revision: March 20122013 Infiniti JX
Is the inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit.
NO- Repair or replace error-detected parts.
8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
4.Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
5.Also check harness for short to power.
Is the inspection result normal?
YES- GO TO 9.
NO- Repair open circuit, short to ground or short to power in harness or connectors.
9. CHECK A/F SENSOR 1 HEATER
Check A/F sensor 1 heater. Refer to "Component Inspection" P0031.
Is the inspection result normal?
YES- GO TO 10.
NO- GO TO 12.
10. CHECK HEATED OXYGEN SENSOR 2
Check heated oxygen sensor 2. Refer to "Component Inspection" P0037.
Revision: March 20122013 Infiniti JX
Is the inspection result normal?
YES- GO TO 11.
NO- Replace malfunctioning heated oxygen sensor 2.
11. CHECK INTERMITTENT INCIDENT
Check intermittent incident. Perform "Intermittent Incident" Intermittent Incident.
Is the inspection result normal?
YES- GO TO 12.
NO- Repair or replace malfunctioning part.
12. REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to "Exploded View" Exploded View.
Do you have CONSULT?
YES- GO TO 13.
NO- GO TO 14.
13. CONFIRM A/F ADJUSTMENT DATA
With CONSULT
1.Turn ignition switch ON.
2.Select "A/F ADJ-B1" and "A/F ADJ-B2" in "DATA MONITOR" mode with CONSULT.
3.Make sure that "0.000" is displayed on CONSULT screen.
Is "0.000" displayed?
YES- INSPECTION END
NO- GO TO 14.
14. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
Clear the mixture ratio self-learning value. Refer to "Work Procedure" Work Procedure.
Do you have CONSULT?
YES- GO TO 15.
NO- INSPECTION END
15. CONFIRM A/F ADJUSTMENT DATA
With CONSULT
1.Turn ignition switch ON.
2.Select "A/F ADJ-B1" and "A/F ADJ-B2" in "DATA MONITOR" mode with CONSULT.
3.Make sure that "0.000" is displayed on CONSULT screen.
- INSPECTION END
Revision: March 20122013 Infiniti JX