Infiniti QX4 (R50). Manual — part 542
WORK FLOW
NBSC0019S02
SEL411X
*1
*2
*3
*4
STARTING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont’d)
SC-14
DIAGNOSTIC PROCEDURE 1
NBSC0019S03
Check “B” Terminal Circuit
NBSC0019S0301
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 OFF.
4. Check that the starter motor terminal 1 connection is clean and tight.
5. Check voltage between starter motor terminal 1 and ground using a digital circuit tester.
SEL412X
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)
1. Check voltage between starter motor terminal 1 and battery positive terminal using a digital circuit tester.
SEL413X
OK or NG
OK
©
GO TO 3.
NG
©
Check harness between the battery and the starter motor for poor continuity.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
EL
IDX
STARTING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont’d)
SC-15
3
CHECK STARTER MOTOR GROUND CIRCUIT (VOLTAGE DROP TEST)
1. Check voltage between starter motor case and battery negative terminal using a digital circuit tester.
SEL414X
OK or NG
OK
©
Starter motor “B” terminal circuit is OK. Further inspection necessary. Refer to “WORK
FLOW”, SC-14.
NG
©
Check the starter motor case and ground for poor continuity.
STARTING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont’d)
SC-16
DIAGNOSTIC PROCEDURE 2
=NBSC0019S04
Check “S” Terminal Circuit
NBSC0019S0401
1
CHECK POWER SUPPLY FOR STARTER MOTOR “S” 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 OFF.
4. Disconnect starter motor terminal 2 connector.
5. Check voltage between starter motor terminal 2 and ground using a digital circuit tester.
SEL415X
OK or NG
OK
©
GO TO 2.
NG
©
Check the following.
I
40A fusible link (letter e, located in fuse and fusible link box)
I
Park/neutral position relay
I
Harness for open or short
2
CHECK “S” TERMINAL CONNECTION QUALITY (VOLTAGE DROP TEST)
1. Connect starter motor terminal 2 connector.
2. Check voltage between starter motor terminal 2 and battery positive terminal using a digital tester.
SEL416X
OK or NG
OK
©
Starter motor “S” terminal circuit is OK. Further inspection necessary. Refer to “WORK
FLOW”, SC-14.
NG
©
Check harness between the battery and the starter motor “S” terminal for poor continuity.
MINIMUM SPECIFICATION OF CRANKING VOLTAGE
REFERENCING COOLANT TEMPERATURE
NBSC0019S05
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
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
EL
IDX
STARTING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont’d)
SC-17
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