Nissan Sentra B18 (2020-2025) Service Manual: B20c8-14 Compressor (ecv)

Nissan Sentra B18 (2020-2025) Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning Control System :: Manual Air Conditioner / Dtc/circuit Diagnosis / B20c8-14 Compressor (ecv)

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
B20C8-14	Compressor (ECV) [Compressor (electrical control valve)]	[CIRC SHORT TO GRND OR OPEN]	Diagnosis condition	When A/C switch is ON
			Signal (Terminal)	ECV control signal
			Threshold	ECV control signal circuit has a shorted to ground or open
			Diagnosis delay time	1 second or more

POSSIBLE CAUSE

Fuse
Harness or connectors (ECV control signal circuit is shorted to ground or open)
A/C ompressor
IPDM E/R

FAIL-SAFE

Inhibit A/C compressor (ECV) operation

Confirmation Procedure

Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE
1. CONSULT
  1. Start the engine.
  2. Turn A/C switch ON.
  3. Select “Self Diagnostic Result” mode of “IPDM E/R”.
Is DTC detected?
YES>>
Refer to DTC Diagnosis Procedure.
NO>>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO>>
Confirmation after repair: Inspection End.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

CHECK FUSE

Ignition switch OFF.

Check that the following fuse is not blown (open):

Component	Location	Fuse No.	Capacity
A/C compressor	IPDM E/R	89	10 A

Is the fuse blown (open)?

YES >>

Replace the blown (open) fuse after repairing the affected circuit if a fuse is blown (open).

NO >>

GO TO 2.

CHECK ECV POWER SUPPLY CIRCUIT

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 4.

NO >>

GO TO 3.

CHECK ECV POWER SUPPLY CIRCUIT FOR OPEN

Ignition switch OFF.
Disconnect IPDM E/R 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	4	F96	71	Yes

Is the inspection result normal?

YES >>

Replace IPDM E/R. Refer to Removal and Installation.

NO >>

Repair harness or connector.

CHECK ECV CONTROL SIGNAL CIRCUIT FOR OPEN

Ignition switch OFF.
Disconnect IPDM E/R 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 5.

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 6.

NO >>

Repair harness or connector.

CHECK ECV
1. Check ECV. Refer to Component Inspection.
Is the inspection result normal?
YES >>
Replace IPDM E/R. Refer to Removal and Installation.
NO >>
Replace A/C compressor. Refer to Removal and Installation.

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