Infiniti M45 (Y34). Manual — part 740
STARTING SYSTEM
SC-11
C
D
E
F
G
H
I
J
L
M
A
B
SC
Trouble Diagnosis with Battery/Starting/Charging System Tester
AKS002EM
NOTE:
To ensure a complete and thorough diagnosis, the battery, starter and alternator test segments must be done
as a set from start to finish.
1.
Turn off all loads on the vehicle electrical system.
2.
Perform battery test with Battery/Starting/Charging system
tester. Refer to
SC-6, "Trouble Diagnosis with Battery/Starting/
.
3.
Press “ENTER” to begin the starting system test.
4.
Start the engine.
5.
Diagnosis result is displayed on the tester. Refer to
"DIAGNOSTIC RESULT ITEM CHART"
.
NOTE:
●
If the starter performs normally but the engine does not start,
perform engine diagnosis.
●
For intermittent “NO CRANK” or “NO STARTER OPERA-
TION” incidents, refer to DIAGNOSTIC PROCEDURE 2.
DIAGNOSTIC RESULT ITEM CHART
SEL408X
SEL409X
SEL410X
Diagnostic item
Service procedure
CRANKING VOLTAGE NORMAL
Go to
CRANKING VOLTAGE LOW
Go to
CHARGE BATTERY
Perform the slow battery charging procedure. (Initial rate of charge is 10A for 12 hours.) Per-
form battery test again with Battery/Starting/Charging system tester. Refer to
Diagnosis with Battery/Starting/Charging System Tester"
.
REPLACE BATTERY
Before replacing battery, clean the battery cable clamps and battery posts. Perform battery
test again with Battery/Starting/Charging system tester. Refer to
with Battery/Starting/Charging System Tester"
. If second test result is “REPLACE BAT-
TERY”, then do so. Perform battery test again to confirm repair.
SC-12
STARTING SYSTEM
WORK FLOW
*1
SC-6, "Trouble Diagnosis with Bat-
tery/Starting/Charging System
Tester"
*2
SC-14, "MINIMUM SPECIFICATION
OF CRANKING VOLTAGE REFER-
ENCING COOLANT TEMPERA-
TURE"
*3
SC-13, "DIAGNOSTIC PROCE-
DURE 1"
*4
SC-14, "DIAGNOSTIC PROCE-
DURE 2"
SKIB0227E
STARTING SYSTEM
SC-13
C
D
E
F
G
H
I
J
L
M
A
B
SC
DIAGNOSTIC PROCEDURE 1
Check “B” Terminal Circuit
1.
CHECK POWER SUPPLY FOR STARTER MOTOR “B” TERMINAL
1.
Remove the fuel pump fuse.
2.
Crank or start the engine (where possible) until the fuel pressure is released.
3.
Turn the ignition switch OFF.
4.
Make sure that the starter motor B terminal E313 terminal 2 (B/R) connection is clean and tight.
5.
Check voltage between starter motor B terminal E313 terminal 2
(B/R) and ground using a digital circuit tester.
OK or NG
OK
>> GO TO 2.
NG
>> Check harness between the battery and the starter
motor for open circuit.
2.
CHECK BATTERY CABLE CONNECTION QUALITY (VOLTAGE DROP TEST)
Check voltage between starter motor B terminal E313 terminal 2 (B/
R) and battery positive terminal using a digital circuit tester.
OK or NG
OK
>> GO TO 3.
NG
>> Check harness between the battery and the starter
motor for poor continuity.
3.
CHECK STARTER MOTOR GROUND CIRCUIT (VOLTAGE DROP TEST)
1.
Turn ignition switch OFF.
2.
Check voltage between starter motor case and battery negative
terminal using a digital circuit tester.
OK or NG
OK
>> Starter motor “B” terminal circuit is OK. Further inspec-
tion necessary. Refer to
NG
>> Check the starter motor case and ground for poor conti-
nuity.
Battery voltage should exist.
PKIA2842E
When the ignition switch is in START position,
Voltage: Less than 0.5V
PKIA2370E
When the ignition switch is in START position,
Voltage: Less than 0.2V
PKIA2943E
SC-14
STARTING SYSTEM
DIAGNOSTIC PROCEDURE 2
Check “S” Connector Circuit
1.
CHECK POWER SUPPLY FOR STARTER MOTOR “S” CONNECTOR
1.
Remove the fuel pump fuse.
2.
Crank or start the engine (where possible) until the fuel pressure is released.
3.
Turn the ignition switch OFF.
4.
Disconnect starter motor connector.
5.
Check voltage between starter motor harness connector E312
terminal 1 (B/R) and ground using a digital circuit tester.
OK or NG
OK
>> GO TO 2.
NG
>> Check the following.
●
50A fusible link (letter G , located in fuse, fusible link
and relay box)
●
Ignition switch
●
Park/neutral position relay
●
Harness for open or short
2.
CHECK “S” TERMINAL CONNECTION QUALITY (VOLTAGE DROP TEST)
1.
Turn ignition switch OFF.
2.
Connect starter motor connector.
3.
Check voltage between starter motor harness connector E312
terminal 1 (B/R) and battery positive terminal using a digital cir-
cuit tester.
OK or NG
OK
>> Starter motor “S” connector circuit is OK. Further inspec-
tion necessary. Refer to
NG
>> Check harness between the battery and the starter motor “S” connector for poor continuity.
MINIMUM SPECIFICATION OF CRANKING VOLTAGE REFERENCING COOLANT TEMPERA-
TURE
When the ignition switch is in START position,
Battery voltage should exist.
PKIA2807E
When the ignition switch is in START position,
Voltage: Less than 1V
PKIA2808E
Engine coolant temperature
Voltage V
−
30
°
C to
−
20
°
C (
−
22
°
F to
−
4
°
F)
8.4
−
19
°
C to
−
10
°
C (
−
2
°
F to 14
°
F)
8.9
−
9
°
C to 0
°
C (16
°
F to 32
°
F)
9.3
More than 1
°
C (More than 34
°
F)
9.7
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