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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 217 (Engine Control System (DTC/Circuit Diagnosis) (CUMMINS 5.0L) (6 Of 6)) >> DTC/Circuit Diagnosis >> DTC P2509-00: ECM Power Input Signal Intermittent >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR CURRENT DTC 
    1. Turn ignition switch ON.
    2. Connect CONSULT and check for existing "ENGINE" diagnostic trouble codes.

    Is DTC P2509 - 00 current?

    YES

    GO TO 2 .

    NO

    • If past DTC P2509 - 00 is found in the ECM, check the battery disconnect devices in the vehicle. If ignition switch and ECM power are disconnected at the same time, DTC P2509 - 00 will be logged.
    • GO TO 12 .
  2. CHECK BATTERIES AND POWER CONNECTOR 
    1. Turn ignition switch OFF.
    2. Check battery connections.
    3. Check battery terminal connections.

    Are connections tight and corrosion-free?

    YES

    GO TO 3 .

    NO

    • Tighten the loose connections, and clean the terminals.
    • GO TO 12 .
  3. CHECK BATTERY VOLTAGE 
    1. Turn ignition switch ON.
    2. Check battery voltage.
    3. Place the positive (+) probe of the multimeter on the positive battery terminal and touch the negative (-) probe to the negative battery terminal while trying to start the engine.

    Does the normal condition exists of approximately battery voltage and > 6.2V during cranking?

    YES

    GO TO 4 .

    NO

    • Charge or replace the battery.
    • GO TO 12 .
  4. INSPECT THE HARNESS AND ECM CONNECTOR PINS 
    1. Turn ignition switch OFF.
    2. Disconnect the ECM.
    3. Inspect connector for the following:
      • Loose connector.
      • Corroded pins.
      • Bent or broken pins.
      • Pushed back or expanded pins.
      • Moisture in or on the connector.
      • Missing or damaged connector seals.
      • Dirt or debris on or in the connector pins.
      • Connector shell broken.
      • Wire insulation damage.
      • Damaged connector locking tab.

    Is the inspection result normal?

    YES

    GO TO 5 .

    NO

    • Repair or replace error-detected parts.
    • GO TO 12 .
  5. CHECK FOR AN OPEN CIRCUIT IN THE BATTERY POWER CIRCUIT 

    Using a multimeter, measure the voltage between the ECM battery supply and engine block ground.

    ECM

    Voltage (V)

    (Approx.)

    Connector

    Terminal (+)

    Terminal (-)

    E93

    83

    Ground

    Battery voltage

    Is the inspection result normal?

    YES

    GO TO 9 .

    NO

    GO TO 6 .

  6. VERIFY THE FUSE IS INSTALLED CORRECTLY 
    1. Turn ignition switch OFF.
    2. Inspect fuse #68 (5A) for correct installation.

    Is the fuse installed correctly?

    YES

    GO TO 7 .

    NO

    • Install the fuse correctly.
    • GO TO 12 .
  7. CHECK FOR A BLOWN FUSE 
    1. Turn ignition switch OFF.
    2. Check the ECM battery fuse #68 for open.

    Is the fuse open?

    YES

    • Locate and repair short in the harness.
    • Replace the blown fuse.
    • GO TO 12 .

    NO

    GO TO 8 .

  8. CHECK ADD-ON ACCESSORY WIRING AT BOTH BATTERY POSITIVE TERMINALS 
    1. Check for add-on or the accessory wiring at the (+) terminal of the batteries.
    2. Examine wiring for damaged insulation or an installation error that can cause the supply wire to be shorted to the engine block.

    Are there any damaged wires?

    YES

    • Locate and repair the damaged wiring.
    • GO TO 12 .

    NO

    • Repair or replace the wiring harness between the ECM and the battery.
    • GO TO 12 .
  9. CHECK THE RESISTANCE OF THE BATTERY SUPPLY CIRCUIT 
    1. Disconnect the positive terminals from both batteries.
    2. Use a digital multimeter, set it to low resistance mode and calibrate it to zero.
    3. Measure the resistance between the ECM battery SUPPLY (+) terminal 83 and the positive battery connector.
    4. Measure the resistance between the ECM battery SUPPLY (-) terminals 1, 2, 4 and the negative battery connector.

    ECM

    Battery post cable

    Continuity

    Connector

    Terminal

    E93

    83

    Positive battery terminal

    < 1.0 Ω

    1

    Positive negative terminal

    2

    4

    Is the resistance less than 1.0 ohm?

    YES

    GO TO 10 .

    NO

    • Repair or replace the wiring harness for high resistance.
    • GO TO 12 .
  10. CHECK THE IGNITION SWITCH CIRCUIT TO THE ECM FOR RESISTANCE 

    Measure the resistance of the ignition circuit between the ECM terminal 65 and the IPDM E/R fuse #40 (15A).

    ECM

    IPDM E/R

    Continuity

    Connector

    Terminal

    Terminal

    E93

    65

    Fuse #40

    < 5.0 Ω

    Is the resistance less than 5.0 ohms?

    YES

    GO TO 11 .

    NO

    • Repair or replace the wiring harness for high resistance.
    • GO TO 12 .
  11. CHECK THE IGNITION SWITCH INPUT CIRCUIT FOR RESISTANCE 

    Measure the resistance of the power circuit between the battery positive terminal and the IPDM E/R.

    Battery post cable

    IPDM E/R

    Continuity

    Positive battery terminal

    Battery supply

    < 5.0 Ω

    Is the resistance less than 5.0 ohms?

    YES

    GO TO 12 .

    NO

    • Repair or replace the wiring harness for high resistance.
    • GO TO 12 .
  12. ERASE THE DIAGNOSTIC TROUBLE CODES 
    1. Connect all harness connectors.
    2. Turn ignition switch ON.
    3. Using CONSULT, erase "ENGINE" DTCs.
    4. Operate the engine within the "Conditions for Clearing the DTC".
    5. Using CONSULT, check for current "ENGINE" diagnostic trouble codes.

    Is P2509 - 00 DTC current?

    YES

    Return to diagnostic procedure. Refer to DTC Description .

    NO

    Repair complete.

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