2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 320
Is exhaust gas leak detected?
YES - Repair or replace malfunctioning part.
NO - GO TO 4.
4.CHECK FOR INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
Is intake air leak detected?
YES - Repair or replace malfunctioning part.
NO - GO TO 5.
5.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
1. Clear the mixture ratio self-learning value. See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Programming and Relearning/Mixture Ratio Self - Learning Value Clear/Special Repair Requirement.
2. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P172, P0174 or P0175 detected? Is it difficult to start engine?
YES - Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. See: P Code Charts/P0171 or See: P Code Charts/P0172.
NO - GO TO 6.
6.CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT
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.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E12, F3
- IPDM E/R harness connector E7
- 15 A fuse (No. 85)
- Harness for open or short between A/F sensor 1 and fuse
- Repair or replace harness or connectors.
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.
