2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 337
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 P0172 or P0175 detected? Is it difficult to start engine?
YES - Perform trouble diagnosis for DTC P0172, P0175. See: P Code Charts/P0172.
NO - GO TO 11.
11.CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect HO2S2 harness connector.
3. Disconnect ECM harness connector.
4. Check the continuity between HO2S2 harness connector and ECM harness connector.
5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - GO TO 12.
NO - Repair open circuit, short to ground or short to power in harness or connectors.
12.CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between HO2S2 harness connector and ECM harness connector.
2. Check the continuity between HO2S2 harness connector or ECM harness connector and ground.
3. Also check harness for short to power.
Is the inspection result normal?
YES - GO TO 13.
NO - Repair open circuit, short to ground or short to power in harness or connectors.
13.CHECK HEATED OXYGEN SENSOR 2
See: P Code Charts/P0138.
Is the inspection result normal?
YES - GO TO 15.
NO - GO TO 14.
14.REPLACE HEATED OXYGEN SENSOR 2
Replace malfunctioning heated oxygen sensor 2.
CAUTION:
- Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a
concrete floor; use a new one.
- Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).
- INSPECTION END
15.CHECK INTERMITTENT INCIDENT
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Initial Inspection and Diagnostic Overview/Trouble
Diagnosis For Intermittent Incident/Description.
