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Detailed Flow

NOTE: To ensure a complete and thorough diagnosis, the battery, starter motor and alternator test segments must be done as a set from start to finish.
  1. DIAGNOSIS WITH MULTITASKING BATTERY AND ELECTRICAL DIAGNOSTIC STATION GR8-1200 NI 

    Perform the starting system test with Multitasking battery and electrical diagnostic station GR8-1200 NI. 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 correctly.

    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. 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 the cranking voltage with the specifications.

    MINIMUM SPECIFICATION OF CRANKING VOLTAGE REFERENCING COOLANT TEMPERATURE

    Engine coolant temperature [°C (°F)] Voltage [V]
    -30 to -20 (-22 to -4) 8.6
    -19 to -10 (-2 to 14) 9.1
    -9 to 0 (16 to 32) 9.5
    More than 1 (More than 34) 9.9

    Is the voltage less than the specified value? 

    YES: GO TO  7.

    NO: GO TO 6.

  6. STARTER OPERATION 

    Check the starter operation status.

    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. Refer to "DIAGNOSIS PROCEDURE ".

    Is "B" terminal circuit normal? 

    YES: GO TO 8.

    NO: Repair as needed.

  8. "S" CONNECTOR CIRCUIT INSPECTION 

    Check "S" connector circuit. Refer to "DIAGNOSIS PROCEDURE ".

    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. Refer to "REMOVAL AND INSTALLATION ".

    NO: Perform further diagnosis of engine mechanical or powertrain mechanism. Once resolved, perform battery test again using Multitasking battery and electrical diagnostic station GR8-1200 NI. Refer to the diagnostic station Instruction Manual for proper testing procedures.

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