DTC Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).
  - ECM
  - Harness connector E55
  - Harness connector M78
Is the inspection result normal?

YES

GO TO 2.

NO

Repair the terminal and connector.

CHECK HARNESS FOR OPEN CIRCUIT

Disconnect the connector of ECM.

Check the resistance between the ECM harness connector terminals.

With VQ40DE

ECM harness connector			Resistance (Ohm)
Connector No.	Terminal No.
E16	124	123	Approx. 108 - 132

With VK56VD

ECM harness connector			Resistance (Ohm)
Connector No.	Terminal No.
E77	124	123	Approx. 108 - 132

Is the measurement value within the specification?

YES

GO TO 3.

Repair the ECM branch line.

CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the ECM. Refer to the following.
- VQ40DE: Diagnosis Procedure
- VK56VD: Diagnosis Procedure
Is the inspection result normal?

YES

Replace the ECM. Refer to the following.
- VQ40DE: Removal and Installation
- VK56VD: Removal and Installation
YES

Error was detected in the ECM branch line.

NO

Repair the power supply and the ground circuit.