Diagnosis Procedure - VQ40DE
WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
Regarding Wiring Diagram information, refer to "WIRING DIAGRAM - VQ40DE ".
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 2 POWER SUPPLY VOLTAGE
- Turn ignition switch OFF.
- Make sure that starter motor connector E210 terminal 2 connection is clean and tight.
- Check voltage between starter motor connector E210 terminal 2 and ground.
(+) (-) Voltage Connector Terminal E210 2 Ground Battery voltage Is there battery voltage present?
YES: GO TO 2
NO: 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 E210 terminal 2 while cranking the engine.
(-) (+) Condition Voltage Connector Terminal E210 2 Battery (+) terminal While cranking the engine Less than 0.2V Is the voltage drop less than 0.2V?
YES: GO TO 3
NO: 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 0.2V Is the voltage drop less than 0.2V?
YES: Terminal 2 circuit is OK. Further inspection necessary. Refer to "WORK FLOW ".
NO: Check the starter motor case to engine mounting for high resistance.