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Nissan Sentra B18 (2020-2025) Service Manual: Power Supply and Ground Circuit (ecm)

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK THE BATTERY CABLE

    1. Turn ignition switch OFF.

    2. Check the battery cable for tightening enough.

      Note:

      Check the continuity between the battery cable and the battery terminal.

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    Repair or replace battery cable connection.

  2. CHECK ECM INTERMITTENT INCIDENT

    Check intermittent incident. Refer to Intermittent Incident.

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Repair or replace ECM connection.

  3. CHECK FUSE

    1. Turn ignition switch OFF.

    2. Check that the following fuse is not blowing.

      Location

      Fuse No.

      Capacity

      IPDM E/R

      #71

      10A

      #80

      15A

      #91

      5A

    Is the fuse blown (open)?

    YES >>

    If the replaced fuse is blown again. Check IPDM E/R power supply.

    NO >>

    GO TO 4.

  4. CHECK GROUND CONNECTION

    Check ground connection E9 and E15. Refer to Circuit Inspection.

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    Repair or replace ground connection.

  5. CHECK ECM GROUND CIRCUIT

    1. Disconnect ECM harness connector.

    2. Check the continuity between ECM harness connector and ground.

      ECM

      —

      Continuity

      Connector

      Terminal

      F24

      5

      Ground

      Existed

      65

      F25

      69

      E16

      157

      159

      162

    3. Also check harness for short to power.

    Is the inspection result normal?

    YES >>

    GO TO 6.

    NO >>

    Repair or replace malfunctioning part.

  6. CHECK ECM POWER SUPPLY-1

    1. Reconnect ECM harness connector.

    2. Turn ignition switch ON.

    3. Check the voltage between ECM harness connector and ground.

      ECM

      Voltage

      (Approx.)

      Connector

      +

      −

      Terminal

      E16

      155

      162

      Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 7.

    NO >>

    GO TO 8.

  7. CHECK ECM POWER SUPPLY-2

    Check the voltage between ECM harness connector and ground.

    ECM

    Condition

    Voltage

    (Approx.)

    Connector

    +

    −

    Terminal

    E16

    155

    162

    Ignition switch ON → OFF

    After turning ignition switch OFF, battery voltage will exist for a few seconds and drop to approximately 0 V.

    Is the inspection result normal?

    YES >>

    GO TO 11.

    NO >>

    GO TO 9.

  8. CHECK ECM POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Disconnect IPDM E/R harness connector.

    4. Check the continuity between ECM harness connector and IPDM E/R harness connector.

      ECM

      IPDM E/R

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E16

      155

      F96

      73

      Existed

    5. Also check harness for short to power.

    Is the inspection result normal?

    YES >>

    GO TO 9.

    NO >>

    Repair or replace malfunctioning part.

  9. CHECK ECM RELAY CONTROL SIGNAL

    Check the voltage between ECM harness connector terminals as per the following.

    +

    −

    Condition

    Voltage

    (Approx.)

    ECM

    Connector

    Terminal

    Connector

    Terminal

    Ignition switch ON

    0 V

    F25

    74

    E16

    162

    Turn ignition switch OFF and wait at least 10 seconds.

    Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 12.

    NO >>

    GO TO 10.

  10. CHECK ECM RELAY CONTROL CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Disconnect IPDM E/R harness connector.

    4. Check the continuity between ECM harness connector and IPDM E/R harness connector.

      ECM

      IPDM E/R

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F25

      74

      F98

      93

      Existed

    5. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES >>

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

    NO >>

    Repair or replace malfunctioning part.

  11. CHECK IGNITION SWITCH SIGNAL

    1. Turn ignition switch ON.

    2. Check the voltage between ECM harness connector terminals.

      ECM

      Condition

      Voltage

      (Approx.)

      Connector

      +

      −

      Terminal

      E16

      143

      162

      Ignition switch OFF

      0 V

      Ignition switch ON

      Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 13.

    NO >>

    GO TO 12.

  12. CHECK IGNITION SWITCH SIGNAL CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Disconnect IPDM E/R harness connector.

    4. Check the continuity between ECM harness connector and IPDM E/R harness connector.

      +

      −

      Continuity

      ECM

      IPDM E/R

      Connector

      Terminal

      Connector

      Terminal

      E16

      143

      E43

      19

      Existed

    5. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES >>

    Perform trouble diagnosis for power supply.

    NO >>

    Repair or replace malfunctioning part.

  13. CHECK ECM POWER SUPPLY (BACK-UP)

    Check the voltage between ECM harness connector terminals.

    ECM

    Voltage

    +

    −

    Connector

    Terminal

    Connector

    Terminal

    F25

    123

    E16

    162

    Battery voltage

    Is the inspection result normal?

    YES >>

    Check intermittent incident. Refer to Intermittent Incident.

    NO >>

    GO TO 14.

  14. CHECK ECM POWER SUPPLY (BACK-UP) CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Pull out 10 A fuse (No.71).

    4. Check the continuity between ECM harness connector and fuse.

      ECM

      Fuse No.

      Continuity

      Connector

      Terminal

      F25

      123

      71

      Existed

    5. Also check harness for short to ground.

    Is the inspection result normal?

    YES >>

    Perform the trouble diagnosis for battery power supply circuit.

    NO >>

    Repair or replace error-detected parts.

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