B Terminal Circuit Check

B Terminal Circuit Check

Description

Terminal "2" (B) is constantly supplied with battery power.

Diagnosis Procedure

Regarding Wiring Diagram information, refer to [Starting System: Wiring Diagram [VQ40DE with Clutch Interlock Cancel Switch] ], [Starting System: Wiring Diagram [VQ40DE without Clutch Interlock Cancel Switch] ] or [Starting System: Wiring Diagram [QR25DE] Starting System ].

CAUTION:

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

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

1. CHECK TERMINAL 2 POWER SUPPLY VOLTAGE

1 Turn ignition switch OFF.
2 Make sure that starter motor connector E210 terminal 2 connection is clean and tight.
3 Check voltage between starter motor connector E210 terminal 2 and ground.











Is there battery voltage present?
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 park or neutral.
2 Depress the clutch pedal if the vehicle is equipped with M/T.
3 Check voltage between battery positive terminal and starter motor connector E210 terminal 2 while cranking the engine.











Is the voltage drop less than 0.2 V?
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 voltage drop less than 0.2 V?
YES
Terminal 2 circuit is OK. Further inspection necessary. Refer to [Diagnosis and Repair Workflow] Initial Inspection and Diagnostic Overview.
NO
Check the starter motor case to engine mounting for high resistance.