2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 790
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. See: P Code Charts/P0171 or See: P Code Charts/P0172.
NO - GO TO 5.
5.CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Check that water is not inside connectors.
Is the inspection result normal?
YES - GO TO 6.
NO - Repair or replace harness connector.
6.CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. 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.
4. Check the continuity between A/F sensor 1 harness connector or ECM harness connector and ground.
