Diagnosis Procedure
WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
Regarding Wiring Diagram information, refer to WIRING DIAGRAM .
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 B POWER SUPPLY VOLTAGE
- Turn ignition switch OFF.
- Make sure that starter motor connector F27 terminal B connection is clean and tight.
- Check voltage between starter motor connector F27 terminal B and ground.
(+) (-) Voltage
(Approx.)Connector Terminal F27 B Ground Battery voltage
Is the inspection result normal?
YES
GO TO STEP 2
NO
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 F27 terminal B while cranking the engine.
(+) (-) Condition Voltage
(Approx.)Connector Terminal Battery (+) terminal F27 B While cranking the engine Less than 0.5V Is the inspection result normal?
YES
GO TO STEP 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
(Approx.)Starter motor case Battery (-) terminal While cranking the engine Less than 0.5V Is the inspection result normal?
YES
Terminal B circuit is OK. Further inspection is necessary. Refer to WORK FLOW (WITH GR8-1200 NI) or WORK FLOW (WITHOUT GR8-1200 NI) .
NO
Check the starter motor case to engine mounting for high resistance.