Diagnostic Test
WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK HO2S2 POWER SUPPLY
- Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
- Turn ignition switch ON.
- Check the voltage between HO2S2 harness connector and ground.
DTC HO2S2 Ground Voltage Bank Connector Terminal P0141 1 F75 1 Ground Battery voltage P0161 2 F76 1
Is the inspection result normal?
YES
GO TO STEP 3 .
NO
GO TO STEP 2 .
- CHECK HO2S2 SENSOR 1 POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect IPDM E/R harness connector.
- Check the continuity between HO2S2 harness connector and IPDM E/R harness connector.
DTC HO2S2 IPDM E/R Continuity Bank Connector Terminal Connector Terminal P0141 1 F75 1 F19 52 Existed P0161 2 F76 1 53 Is the inspection result normal?
YES
Perform the trouble diagnosis for power supply circuit.
NO
Repair or replace error-detected parts.
- CHECK HO2S2 HEATER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between HO2S2 harness connector and ECM harness connector.
DTC HO2S2 ECM Continuity Bank Connector Terminal Connector Terminal P0141 1 F75 2 F78 7 Existed P0161 2 F76 2 47 - Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO STEP 4 .
NO
Repair open circuit, short to ground or short to power in harness or connectors.
- CHECK HEATED OXYGEN SENSOR 2 HEATER
Check heated oxygen sensor 2 heater. Refer to COMPONENT INSPECTION .
Is the inspection result normal?
YES
Check intermittent incident. Refer to INTERMITTENT INCIDENT .
NO
Replace malfunctioning heated oxygen sensor 2. Refer to REMOVAL AND INSTALLATION (BANK 2) , REMOVAL AND INSTALLATION (BANK 1) .