Infiniti Q45 (FY33). Manual — part 263
Trouble Diagnoses with
Battery/Starting/Charging System Tester
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.
SEL408X
1.
Turn off all loads on the vehicle electrical system.
2.
Perform battery test with Battery/Starting/Charging system
tester. Refer to EL-38.
3.
Press “ENTER” to begin the starting system test.
SEL409X
4.
Start the engine.
SEL410X
5.
Diagnosis result is displayed on the tester. Refer to “DIAG-
NOSTIC RESULT ITEM CHART”, EL-43.
NOTE:
I
If the starter performs normally but the engine does not
start, perform engine diagnosis.
I
For intermittent “NO CRANK” or “NO STARTER OPERA-
TION” incidents, go to DIAGNOSTIC PROCEDURE 2.
DIAGNOSTIC RESULT ITEM CHART
Diagnostic item
Service procedure
CRANKING VOLTAGE NORMAL
Go to “WORK FLOW”, EL-44.
CRANKING VOLTAGE LOW
Go to “WORK FLOW”, EL-44.
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 EL-38.
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 EL-38. If second test result
is “REPLACE BATTERY”, then do so. Perform battery test again to confirm repair.
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
IDX
STARTING SYSTEM
EL-43
WORK FLOW
SEL411X
*1
*2
*3
*4
STARTING SYSTEM
Trouble Diagnoses with
Battery/Starting/Charging System Tester
(Cont’d)
EL-44
SEL065Y
Trouble Diagnoses
DIAGNOSTIC PROCEDURE 1
(“B” terminal circuit check)
SEL066Y
SEL067Y
CHECK POWER SUPPLY FOR STARTER
MOTOR “B” TERMINAL.
1. Remove the fuel pump fuse.
2. Crank or start the engine (where pos-
sible) until the fuel pressure is released.
3. Turn the ignition switch OFF.
4. Check that the starter motor terminal
q
2
is clean and connected tightly.
5. Check voltage between starter motor
harness connector
E117
terminal
q
2
(B/L) and ground using a digital circuit
tester.
Battery voltage should exist.
OK
E
NG
Check harness between the
battery and starter motor for
open circuit.
CHECK BATTERY CABLE CONNECTION
QUALITY (VOLTAGE DROP TEST).
1. Check voltage between starter motor
harness connector
E117
terminal
q
2
(B/L) and battery positive terminal using
a digital circuit tester.
When the ignition switch is in START posi-
tion:
Voltage: Less than 0.5V
OK
E
NG
Check harness between the
battery and the starter
motor for poor continuity.
CHECK STARTER MOTOR GROUND
CIRCUIT (VOLTAGE DROP TEST).
1. Check voltage between starter motor
case and battery negative terminal using
a circuit tester.
When the ignition switch is in START posi-
tion:
Voltage: Less than 0.2V
OK
E
NG
Check the starter motor
case and ground for poor
continuity.
Starter motor “B” terminal circuit is OK.
Further inspection is necessary.
Refer to “WORK FLOW”, EL-44.
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
IDX
STARTING SYSTEM
H
H
H
EL-45
SEL068Y
DIAGNOSTIC PROCEDURE 2
(“S” terminal circuit check)
SEL069Y
CHECK POWER SUPPLY FOR STARTER
MOTOR “S” TERMINAL.
1. Remove the fuel pump fuse.
2. Crank or start the engine (where pos-
sible) until the fuel pressure is released.
3. Turn the ignition switch OFF.
4. Disconnect starter motor connector
E116
.
5. Check voltage between starter motor
harness connector
E116
terminal
q
1
(B/W) and ground using a digital circuit
tester.
When the ignition switch is in START posi-
tion.
Battery voltage should exist.
OK
E
NG
Check the following.
I
30A fusible link (letter g ,
located in fuse and fus-
ible link box)
I
Park/neutral position relay
I
Harness for open or short
CHECK “S” TERMINAL CONNECTION
QUALITY (VOLTAGE DROP TEST).
1. Connect starter motor connector
E116
.
2. Check voltage between starter motor
harness connector
E116
terminal
q
1
(B/R) and battery position terminal using
a digital tester.
When the ignition switch is in START posi-
tion:
Voltage: Less than 1V
OK
E
NG
Check harness between the
battery and the starter
motor terminal for poor con-
tinuity.
Starter motor “S” terminal circuit is OK.
Further inspection is necessary.
Refer to “WORK FLOW”, EL-44.
MINIMUM SPECIFICATION OF CRANKING VOLTAGE REFERENCING COOLANT
TEMPERATURE
Engine coolant temperature
Voltage V
−30°C to −20°C (−22°F to −4°F)
8.6
−19°C to −10°C (−2°F to 14°F)
9.1
−9°C to 0°C (16°F to 32°F)
9.5
More than 1°C (More than 34°F)
9.9
STARTING SYSTEM
Trouble Diagnoses (Cont’d)
H
H
EL-46
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