Nissan Sentra B18 (2020-2025) Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning Control System :: Automatic Air Conditioner / Dtc/circuit Diagnosis / Ecv (electrical Control Valve)

Nissan Sentra B18 (2020-2025) Service Manual: Ecv (electrical Control Valve)

Diagnosis Procedure

Diagnosis Procedure

CHECK ECV POWER SUPPLY

Ignition switch OFF.
Disconnect A/C compressor connector.
Ignition switch ON.

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

+	−	Voltage (Approx.)
F10	4	Ground	Battery voltage

−

Voltage

(Approx.)

A/C compressor

Connector

Terminal

F10

Ground

Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

GO TO 2.

CHECK FUSE
1. 1. Ignition switch OFF.
  2. Check 10A fuse [No. 89, located in IPDM E/R].
Is the inspection result normal?
YES>>
Repair harness or connector between A/C compressor and fuse.
NO>>
Replace the blown fuse after repairing the affected circuit.

CHECK ECV CONTROL SIGNAL CIRCUIT FOR OPEN

Ignition switch OFF.
Disconnect A/C auto amp. connector.

Check continuity between A/C compressor harness connector and IPDM E/R harness connector.

A/C compressor		IPDM E/R		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F10	3	F98	98	Yes

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

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	−	Continuity
F10	3	Ground	No

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair harness or connector.

CHECK ECV
1. Check ECV. Refer to Component Inspection.
Is the inspection result normal?
YES>>
GO TO 6.
NO>>
Replace A/C compressor. Refer to Removal and Installation.
CHECK INTERMITTENT INCIDENT
1. Refer to Intermittent Incident.
Is the inspection result normal?
YES>>
Replace IPDM E/R. Refer to Removal and Installation.
NO>>
Repair or replace malfunctioning parts.

Component Inspection

Component Inspection

CHECK ECV (ELECTRICAL CONTROL VALVE)

Ignition switch OFF.
Disconnect A/C compressor connector.

Check continuity between A/C compressor connector F10 terminals.

A/C compressor	Condition	Resistance (Ω) (Approx.)
3	4	68 (20)	10.1 – 11.1

A/C compressor

Condition

Resistance (Ω)

(Approx.)

Terminals

Temperature: °F (°C)

68 (20)

10.1 – 11.1

Is the inspection result normal?

YES >>

Inspection End.

NO >>

Replace A/C compressor. Refer to Removal and Installation.

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