Infiniti QX4 (R50). Manual — part 113
G Sensor and Circuit
DIAGNOSTIC PROCEDURE
NBBR0114
Malfunction code No. 17
1
INSPECTION START
G sensor inspection
SBR504E
©
GO TO 2.
2
CHECK FUSE
Check 7.5A fuse No. 7 for ABS actuator and electric unit. For fuse layout, refer to EL-16, “POWER SUPPLY ROUTING”.
Is fuse OK?
Yes
©
GO TO 3.
No
©
Replace fuse.
3
CHECK CONNECTOR
1. Disconnect connectors from ABS actuator and electric unit and G sensor. Check terminals for damage or loose connec-
tion. Then reconnect connectors.
2. Carry out self-diagnosis again.
Does warning lamp activate again?
Yes
©
GO TO 4.
No
©
INSPECTION END
4
CHECK G SENSOR
Refer to “G SENSOR” in “Electrical Components Inspection”, BR-67.
Is resistance within specifications?
Yes
©
GO TO 5.
No
©
Replace G sensor.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS
ABS
G Sensor and Circuit
BR-65
5
CHECK G SENSOR POWER SUPPLY CIRCUIT
Check voltage between G sensor connector terminals 1, 2 and ground.
SBR861D
Does battery voltage exist?
Yes
©
GO TO 6.
No
©
Check the following. If NG, repair harness or connectors.
I
Harness connectors B58, B81
I
Harness for open or short between G sensor and fuse
6
CHECK CIRCUIT
1. Disconnect harness connector from ABS actuator and electric unit.
2. Check continuity between ABS actuator and electric unit connector terminals 20, 10 and G sensor connector terminals
17, 51.
SBR505E
Does continuity exist?
Yes
©
Check actuator and electric unit pin terminals for damage or the connection of actuator
and electric unit harness connector. Reconnect actuator and electric unit harness con-
nector. Then retest.
No
©
Check the following. If NG, repair harness or connectors.
I
Harness connectors E111, B58, B81
I
Harness for open or short between G sensor connector and actuator and electric unit
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS
ABS
G Sensor and Circuit (Cont’d)
BR-66
SBR844DF
ELECTRICAL COMPONENT INSPECTION
=NBBR0115
G Sensor (4WD models only)
NBBR0115S01
CAUTION:
The G sensor is easily damaged if it sustains an impact. Be
careful not to drop or bump it.
1.
Measure resistance between terminals 2 and 51 of G sensor
unit connector.
G sensor condition
Resistance between ter-
minals 2 and 51
G sensor switch condi-
tion
Installed in vehicle
1.4 - 1.6 k
Ω
“ON”
Tilted as shown in figure
4.7 - 5.5 k
Ω
“OFF”
2.
Measure resistance between terminals 1 and 17 of the G sen-
sor unit connector.
Resistance: 70 - 124
Ω
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS
ABS
G Sensor and Circuit (Cont’d)
BR-67
Control Unit
DIAGNOSTIC PROCEDURE
=NBBR0106
Malfunction code No. 71
1
INSPECTION START
ABS actuator and electric unit power supply and ground circuit inspection
SBR497E
©
GO TO 2.
2
CHECK CONNECTOR
1. Disconnect ABS actuator and electric unit connector.
Check terminals for damage or loose connection. Then reconnect connector.
2. Carry out self-diagnosis again.
Does warning lamp activate again?
Yes
©
GO TO 3.
No
©
INSPECTION END
3
CHECK ABS ACTUATOR AND ELECTRIC UNIT POWER SUPPLY CIRCUIT
Check voltage. Refer to “5. CHECK ABS ACTUATOR AND ELECTRIC UNIT POWER SUPPLY CIRCUIT” in “DIAGNOS-
TIC PROCEDURE”, “Low Voltage”, BR-63.
Does battery voltage exist when ignition switch is turned ON?
Yes
©
GO TO 4.
No
©
Repair.
4
CHECK WARNING LAMP INDICATION
Does warning lamp indicate code No. 71 again?
Yes or No
Yes
©
Replace ABS actuator and electric unit.
No
©
Inspect the system according to the code No.
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS
ABS
Control Unit
BR-68
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