Infiniti QX56 (Z62). Manual — part 1271
DIAGNOSIS AND REPAIR WORKFLOW
STR-13
< BASIC INSPECTION >
C
D
E
F
G
H
I
J
K
L
M
A
STR
N
P
O
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. Once resolved, per-
form battery test again. Refer to Technical Service Bulletin.
STR-14
< DTC/CIRCUIT DIAGNOSIS >
B TERMINAL CIRCUIT
DTC/CIRCUIT DIAGNOSIS
B TERMINAL CIRCUIT
Diagnosis Procedure
INFOID:0000000006275524
CAUTION:
Perform diagnosis under the condition that 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 released.
1.
CHECK “B” TERMINAL CIRCUIT
1.
Turn ignition switch OFF.
2.
Check that starter motor “B” terminal connection is clean and tight.
3.
Check voltage between starter motor “B” terminal 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 CONNECTION STATUS (VOLTAGE DROP TEST)
1.
Shift A/T selector lever to “P” or “N” position.
2.
Check voltage between battery positive terminal and starter motor “B” terminal.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Check harness between the battery and the starter motor for poor continuity.
3.
CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)
1.
Shift A/T selector lever to “P” or “N” position.
2.
Check voltage between starter motor case and battery negative terminal.
Is the inspection result normal?
YES
>> “B” terminal circuit is OK. Further inspection is necessary. Refer to
.
NO
>> Check the starter motor case and ground for poor continuity.
(+)
(–)
Voltage
Starter motor “B” terminal
F57
2 Ground
Battery
voltage
(+)
(–)
Condition
Voltage (V)
(Approx.)
Starter motor “B” terminal
Battery positive terminal
F57
2
When the ignition switch
is in START position
Less than 0.5
(+)
(–)
Condition
Voltage (V)
(Approx.)
Starter motor case
Battery negative terminal
When the ignition switch is in START position
Less than 0.2
S CONNECTOR CIRCUIT
STR-15
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
H
I
J
K
L
M
A
STR
N
P
O
S CONNECTOR CIRCUIT
Diagnosis Procedure
INFOID:0000000006275525
CAUTION:
Perform diagnosis under the condition that 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 released.
1.
CHECK “S” CONNECTOR CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect starter motor connector.
3.
Shift A/T selector lever to “P” or “N” position.
4.
Check voltage between starter motor harness connector and ground.
Is the inspection result normal?
YES
>> “S” connector circuit is OK. Further inspection is necessary. Refer to
.
NO
>> GO TO 2.
2.
CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1.
Turn ignition switch OFF.
2.
Disconnect IPDM E/R harness connector.
3.
Check continuity between starter motor harness connector and IPDM E/R harness connector.
Is the inspection result normal?
YES
>> Further inspection is necessary. Refer to
NO
>> Repair the harness or connector.
(+)
(–)
Condition
Voltage
Starter motor
Connector
Terminal
F55
1 Ground
When the ignition switch
is in START position
Battery voltage
Starter motor harness
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
F55
1
E10
3
Existed
STR-16
< SYMPTOM DIAGNOSIS >
STARTING SYSTEM
SYMPTOM DIAGNOSIS
STARTING SYSTEM
Symptom Table
INFOID:0000000006275526
Symptom
Reference
No normal cranking
Refer to
Starter motor does not rotate
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