Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK ECV (ELECTRICAL CONTROL VALVE) POWER SUPPLY

Turn ignition switch OFF.
Disconnect A/C compressor connector.
Turn ignition switch ON.

Check voltage between A/C compressor harness connector and ground.

+		-	Voltage (Approx.)
A/C compressor
Connector	Terminal
F10	4	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 5 .

GO TO 2 .

CHECK FUSE
1. Turn ignition switch OFF.
2. Check 10 A fuse [No. 30, located in fuse block (J/B)]. Refer to the appropriate Wiring Diagram [Fuse Block - Junction Box (J/B)].
Is the inspection result normal?

YES

GO TO 3 .

NO

Replace the blown fuse after repairing the affected circuit.

CHECK ECV POWER SUPPLY CIRCUIT FOR OPEN

Disconnect fuse block (J/B) connector.

Check continuity between A/C compressor harness connector and fuse block (J/B) harness connector.

A/C compressor		Fuse block (J/B)		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F10	4	E6	1M	Yes

Is the inspection result normal?

YES

GO TO 4 .

Repair harness or connector.

CHECK ECV POWER SUPPLY CIRCUIT FOR SHORT

Disconnect A/C auto amp. connector and A/C switch assembly connector.

Check continuity between A/C compressor harness connector and ground.

A/C compressor		-	Continuity
Connector	Terminal
F10	4	Ground	No

Is the inspection result normal?

YES

Check ignition power supply circuit. Refer to the appropriate Wiring Diagram (Ignition Power Supply).

Repair harness or connector.

CHECK ECV CONTROL SIGNAL CIRCUIT FOR OPEN

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

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

A/C compressor		A/C auto amp.		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F10	3	M37	40	Yes

Is the inspection result normal?

YES

GO TO 6 .

Repair harness or connector.

CHECK ECV CONTROL SIGNAL CIRCUIT FOR SHORT

Check continuity between A/C compressor harness connector and ground.

A/C compressor		-	Continuity
Connector	Terminal
F10	3	Ground	No

Is the inspection result normal?

YES

GO TO 7 .

Repair harness or connector.

CHECK ECV
Check ECV. Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 8 .

NO

Replace A/C compressor. Refer to Removal and Installation .
CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident .

Is the inspection result normal?

YES

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

NO

Repair or replace malfunctioning parts.