2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 297
Diagnosis Procedure
1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connections M16, M70. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component
Tests and General Diagnostics/Power Supply and Ground Circuit.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace ground connections.
2.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, 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 3.
3.CHECK HEATED OXYGEN SENSOR 2 (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.
