B Terminal Circuit

B TERMINAL CIRCUIT

Description

Terminal "B" is constantly supplied with battery power.


Diagnosis Procedure

Regarding Wiring Diagram information, refer to "Wiring Diagram" [1][2]Electrical Diagrams.

CAUTION:
Perform diagnosis under the condition that the engine cannot start by the following procedure.
1.Remove fuel pump fuse.
2.Crank or start the engine (where possible) until the fuel pressure is depleted.

1. CHECK TERMINAL B POWER SUPPLY VOLTAGE

1.Turn ignition switch OFF.
2.Make sure that starter motor connector F27 terminal B connection is clean and tight.
3.Check voltage between starter motor connector F27 terminal B and ground.





Is the inspection result normal?
YES- GO TO 2
NO- Check harness between battery and starter motor for open circuit.

2. CHECK BATTERY CABLE (VOLTAGE DROP TEST)

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





Is the inspection result normal?
YES- GO TO 3
NO- Check harness between the battery and the starter motor for high resistance.

3. CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)

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





Is the inspection result normal?
YES- Terminal B circuit is OK. Further inspection necessary. Refer to "Work Flow (With GR81200 NI)" Work Flow (With GR8-1200 NI) or "Work Flow (Without GR8-1200 NI)" Work Flow (Without GR8-1200 NI).
NO- Check the starter motor case to engine mounting for high resistance.
Revision: March 20122013 Infiniti JX