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Nissan Sentra B18 (2020-2025) Service Manual: 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 compressor

  • IPDM E/R

FAIL-SAFE

Inhibit A/C compressor (ECV) operation

Confirmation Procedure

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

DTC Diagnosis Procedure

  1. CHECK FUSE

      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. 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. 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. 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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