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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 229 (Starting System (Circuit Diagnosis)) >> Circuit Diagnosis >> S Connector Circuit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

Terminal S is the power supply for the starter motor magnetic switch. Terminal S is supplied with power when the ignition switch is turned to the START position while the A/T shift selector is in the P or N position.

CAUTION: Before testing, perform the following procedure to ensure the engine cannot start.
  1. Remove fuel pump fuse.
  2. Crank or start the engine (where possible) until the fuel pressure is depleted.
  1. CHECK STARTER MOTOR MAGNETIC SWITCH CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect starter motor connector F228 (with Cummins 5.0L), or F44 (with VK56VD).
    3. Shift transmission into park or neutral.
    4. Check voltage between starter motor harness connector F228 (with Cummins 5.0L), or F44 (with VK56VD) and ground with the ignition in START.

      (+)

      (-)

      Condition

      Voltage

      (Approx.)

      Connector

      Terminal

      F228 (with Cummins 5.0L)

      F44 (with VK56VD)

      S

      Ground

      Ignition in START position

      Battery voltage

    Is battery voltage present?

    YES

    Magnetic switch circuit is OK. Further inspection is necessary. Refer to Work Flow (With DSS-5000P NI) or Work Flow (Without DSS-5000P NI) .

    NO

    GO TO 2 .

  2. CHECK CONNECTOR 
    1. Turn ignition switch OFF.
    2. Check the IPDM E/R harness connector E120 and starter motor harness connector F228 (with Cummins 5.0L), or F44 (with VK56VD), for damage, bent pins and loose connections.

    Is the inspection result normal?

    YES

    GO TO 3 .

    NO

    Repair the terminal and connector.

  3. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) 
    1. Disconnect IPDM E/R connector E120 and starter motor connector F228 (with Cummins 5.0L), or F44 (with VK56VD).
    2. Check continuity between starter motor harness connector F228 (with Cummins 5.0L), or F44 (with VK56VD), and IPDM E/R harness connector E120.

      Connector

      Terminal

      Connector

      Terminal

      Continuity

      F228 (with Cummins 5.0L)

      F44 (with VK56VD)

      S

      E120

      19

      Yes
    3. Check continuity between starter motor harness connector F228 (with Cummins 5.0L), or F44 (with VK56VD), and ground.

      Connector

      Terminal

      -

      Continuity

      F228 (with Cummins 5.0L)

      F44 (with VK56VD)

      S

      Ground

      No

    Are the continuity test results as specified?

    YES

    Further inspection is necessary. Refer to Work Flow (With DSS-5000P NI) or Work Flow (Without DSS-5000P NI) .

    NO

    Repair the harness.

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