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 B is constantly supplied with battery power.

CAUTION: Before testing, perform the following procedure to ensure the engine cannot start.

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

CHECK TERMINAL B POWER SUPPLY VOLTAGE

Turn ignition switch OFF.
Make sure that starter motor connector F227 (with Cummins 5.0L), or F43 (with VK56VD), connection is clean and tight.

Check voltage between starter motor connector F227 (with Cummins 5.0L), or F43 (with VK56VD), and ground.

(+)

(-)

Voltage

(Approx.)

Connector

Terminal

F227 (with Cummins 5.0L)

F43 (with VK56VD)

Ground

Battery voltage

Is the inspection 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 park or neutral.
Check voltage between battery positive terminal and starter motor connector F227 (with Cummins 5.0L), or F43 (with VK56VD), while cranking the engine.

(+)

(-)

Condition

Voltage

(Approx.)

Battery (+) terminal

Connector

Terminal

F227 (with Cummins 5.0L)

F43 (with VK56VD)

While cranking the engine

Less than 0.2V

Is the inspection 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

(Approx.)

Starter motor case

Battery (-) terminal

While cranking the engine

Less than 0.2V

Is the inspection normal?

YES

Terminal B 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.