Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

CHECK INTAKE SENSOR POWER SUPPLY

Turn ignition switch OFF.
Disconnect intake sensor connector.
Turn ignition switch ON.

Check voltage between intake sensor harness connector and ground.

+		-	Voltage (Approx.)
Intake sensor
Connector	Terminal
M103	1	Ground	5 V

Is the inspection result normal?

YES

GO TO 2.

GO TO 4.

CHECK INTAKE SENSOR GROUND CIRCUIT

Turn ignition switch OFF.

Check continuity between intake sensor harness connector and ground.

Intake sensor		--	Continuity
Connector	Terminal
M103	2	Ground	Yes

Is the inspection result normal?

YES

GO TO 3.

Repair harness or connector.

CHECK INTAKE SENSOR
Check intake sensor. Refer to Component Inspection .

Is the inspection result normal?

YES

Replace A/C auto amp. Refer to Removal and Installation .

NO

Replace intake sensor. Refer to Removal and Installation .

CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR OPEN

Turn ignition switch OFF.
Disconnect A/C auto amp. connector.

Check continuity between intake sensor harness connector and A/C auto amp. harness connector.

Intake sensor		A/C auto amp.		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M103	1	M50	28	Yes

Is the inspection result normal?

YES

GO TO 5.

Repair harness or connector.

CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR GROUND SHORT

Check continuity between intake sensor harness connector and ground.

Intake sensor		--	Continuity
Connector	Terminal
M103	1	Ground	No

Is the inspection result normal?

YES

GO TO 6.

Repair harness or connector.

CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR POWER SHORT

Turn ignition switch ON.

Check voltage between intake sensor harness connector and ground.

+		-	Voltage (Approx.)
Intake sensor
Connector	Terminal
M103	1	Ground	0 V

Is the inspection result normal?

YES

Replace A/C auto amp. Refer to Removal and Installation .

Repair harness or connector.