Initial Inspection and Diagnostic Overview

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow


OVERALL SEQUENCE







DETAILED FLOW

NOTE:
To ensure a complete and thorough diagnosis, the battery, starter motor and generator test segments must be done as a set from start to finish.

1. DIAGNOSIS WITH MULTITASKING BATTERY DIAGNOSTIC STATION

Perform the starting system test with multitasking battery diagnostic station. For details and operating instructions, refer to diagnostic station instruction manual.
Test result
CRANKING NORMAL-GO TO 2
LOW VOLTAGE-GO TO 5
CHARGE BATTERY-Perform the slow battery charging procedure. (Initial rate of charge is 10A for 12
hours.) Perform battery test again. Refer to diagnostic station instruction manual.
REPLACE BATTERY-Before replacing battery, clean the battery cable clamps and battery posts. Perform battery test again. Refer to diagnostic station instruction manual. If second test result is
"REPLACE BATTERY", then do so. Perform battery test again to confirm repair.

2. CRANKING CHECK

Check that the starter motor operates properly.
Does the engine crank normally?
YES- GO TO 3
NO- GO TO 4

3. ENGINE START CHECK

Check that the engine starts.
Does the engine start?
YES- Starter motor is OK. Inspection end.
NO- Perform further diagnosis of engine mechanical or engine control system. Refer to EM and EC
sections. Once resolved, perform battery test again.

4. STARTER MOTOR ACTIVATION

Check that the starter motor operates.
Does the starter motor turn?
YES- Check ring gear and starter motor drive pinion. Once resolved, perform battery test again.
NO- GO TO 7

5. COMPARISON BETWEEN ENGINE COOLANT AND CRANKING VOLTAGE

Compare the engine coolant temperature and verify the cranking voltage is within specification.
Minimum Specification of Cranking Voltage Referencing Coolant Temperature






Is the voltage less than the specified value?
YES- GO TO 7
NO- GO TO 6

6. STARTER OPERATION

Check the starter operation.
Does the starter motor turn smoothly?
YES- Starter motor is OK. Inspection end.
NO- GO TO 7

7. "B" TERMINAL CIRCUIT INSPECTION

Check "B" terminal circuit. Diagnosis Procedure (VQ-40DE) or Diagnosis Procedure (VK-56DE).
Is "B" terminal circuit normal?
YES- GO TO 8
NO- Repair as needed.

8. "S" CONNECTOR CIRCUIT INSPECTION

Check "S" connector circuit. Diagnosis Procedure (VQ-40DE) or Diagnosis Procedure (VK-56DE).
Is "S" connector circuit normal?
YES- GO TO 9
NO- Repair as needed.

9. ENGINE ROTATION STATUS

Check that the engine can be rotated by hand.
Does the engine turn freely by hand?
YES- Replace starter motor. Service and Repair.
NO- Perform further diagnosis of engine mechanical or powertrain mechanism. Refer to EM or TM
sections. Once resolved, perform battery test again. Refer to diagnostic station instruction manual.