Circuit 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.

Terminal "1" (B) is constantly supplied with battery power.

CAUTION: Perform diagnosis under the condition that the engine cannot start by the following procedure.

Remove fuel pump fuse.
Crank or start the engine (where possible) until the fuel pressure is depleted.

CHECK TERMINAL 1 POWER SUPPLY VOLTAGE

Turn ignition switch OFF.
Make sure that starter motor connector E208 (VQ40DE) or F27 (VK56VD) terminal 1 connection is clean and tight.

Check voltage between starter motor connector E208 (VQ40DE) or F27 (VK56VD) terminal 1 and ground.

(+)		(-)	Voltage
Connector	Terminal
E208 (VQ40DE)	1	Ground	Battery voltage
F27 (VK56VD)

Is the inspection result normal?

YES

GO TO 2

Check harness between battery and starter motor for open circuit.

CHECK BATTERY CABLE (VOLTAGE DROP TEST)

Shift the transmission into P (Park) or N (Neutral).
Check voltage between battery positive terminal and starter motor connector E208 (VQ40DE) or F27 (VK56VD) terminal 1 while cranking the engine.

(+)		(-)	Condition	Voltage
Connector	Terminal
E208 (VQ40DE)	1	Battery (+) terminal	While cranking the engine	Less than 0.2 V
F27 (VK56VD)

Is the inspection result normal?

YES

GO TO 3

Check harness between the battery and the starter motor for high resistance.

CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)

Check voltage between starter motor case and battery negative terminal while cranking the engine.

(+)	(-)	Condition	Voltage
Starter motor case	Battery (-) terminal	While cranking the engine	Less than 0.2 V

Is the inspection result normal?

YES

Terminal 1 circuit is OK. Further inspection is necessary. Refer to Work Flow (With DSS-5000P NI) or Work Flow (Without DSS-5000P NI) .

Check the starter motor case to engine mounting for high resistance.