Infiniti QX56 (JA60). Manual — part 921
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< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
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 instruc-
tions, 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. Refer to
.
Is “B” terminal circuit normal?
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
DIAGNOSIS AND REPAIR WORKFLOW
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< BASIC INSPECTION >
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YES
>> GO TO 8.
NO
>> Repair as needed.
8.
“S” CONNECTOR CIRCUIT INSPECTION
Check “S” connector circuit. Refer to
.
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.
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 man-
ual.
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< FUNCTION DIAGNOSIS >
STARTING SYSTEM
FUNCTION DIAGNOSIS
STARTING SYSTEM
System Diagram
INFOID:0000000005149550
System Description
INFOID:0000000005149551
The starter motor plunger closes and provides a closed circuit between the battery and the starter motor. The
starter motor is grounded to the cylinder block. With power and ground supplied, the starter motor operates.
Component Parts Location
INFOID:0000000005149552
ALBIA0416GB
1.
A/T assembly F9 (with built in TCM
F502)
2.
IPDM E/R E119, E120, E122, E124
3.
BCM M18 (view with instrument panel
lower LH panel removed)
AWBIA0127ZZ
STARTING SYSTEM
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< FUNCTION DIAGNOSIS >
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Component Description
INFOID:0000000005149553
Component part
Description
TCM
TCM supplies power to the starter relay inside the IPDM E/R when
the selector lever is shifted to the P or N position.
BCM
BCM sends a starter request signal to the CPU of the IPDM E/R
over the CAN communication lines.
IPDM E/R
CPU inside IPDM E/R operates the starter relay at the request of
the BCM over the CAN communication lines.
Starter motor
The starter motor plunger closes and the motor is supplied with
battery power, which in turn cranks the engine, when the “S” ter-
minal is supplied with electric power.
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