Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection M95. Refer to Ground Inspection in "CIRCUIT INSPECTION ".
Is the inspection result normal?

YES: GO TO 2.

NO: Repair or replace ground connection.

CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR POWER SUPPLY CIRCUIT

Disconnect ECT sensor harness connector.
Turn ignition switch ON.
Check the voltage between ECT sensor harness connector and ground.

TERMINAL VOLTAGE REFERENCE CHART

ECT sensor		Ground	Voltage (V)
Connector	Terminal	Ground	Voltage (V)
F17	1	Ground	Approx. 5

Is the inspection result normal?

YES: GO TO 4.

NO: GO TO 3.

DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F106, F107
- Harness for open or short between ECT sensor and ECM
Repair open circuit, short to ground or short to power in harness or connectors.

CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the continuity between ECT sensor harness connector and ECM harness connector.

TERMINAL CONTINUITY REFERENCE CHART

ECT sensor		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F17	2	F102	84	Existed

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES: GO TO 5.

NO: Repair open circuit, short to ground or short to power in harness or connectors.

CHECK ECT SENSOR
Refer to "COMPONENT INSPECTION ".

Is the inspection result normal?

YES: GO TO 6.

NO: Replace ECT sensor. Refer to "EXPLODED VIEW ".
CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".

INSPECTION END