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

Dtc Description

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Fuse

• Harness or connectors (ECV control signal circuit is shorted to ground or open)

• A/C compressor

• IPDM E/R

FAIL-SAFE

Inhibit A/C compressor (ECV) operation

Confirmation Procedure

1. 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

1. CHECK FUSE

   1. 1. Ignition switch OFF.

      2. 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.

2. CHECK ECV POWER SUPPLY CIRCUIT

   1. 1. Disconnect A/C compressor connector.

      2. Ignition switch ON.

      3. 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 4.

   NO>>

   GO TO 3.

3. CHECK ECV POWER SUPPLY CIRCUIT FOR OPEN

   1. 1. Ignition switch OFF.

      2. Disconnect IPDM E/R connector.

      3. 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
         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.

4. CHECK ECV CONTROL SIGNAL CIRCUIT FOR OPEN

   1. 1. Ignition switch OFF.

      2. Disconnect IPDM E/R connector.

      3. 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
         F10	3	F98	98	Yes

   Is the inspection result normal?

   YES>>

   GO TO 5.

   NO>>

   Repair harness or connector.

5. CHECK ECV CONTROL SIGNAL CIRCUIT FOR SHORT

   1. 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 6.

   NO>>

   Repair harness or connector.

6. 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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