Infiniti QX4 (R50). Manual — part 110
SBR484E
Ground Circuit Check
=NBBR0100
ABS ACTUATOR AND ELECTRIC UNIT GROUND
NBBR0100S01
I
Check continuity between ABS actuator and electric unit con-
nector terminals and ground.
Continuity should exist.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
ABS
Ground Circuit Check
BR-53
Malfunction Code/Symptom Chart
NBBR0101
Code No. (No. of warning lamp flashes)
Malfunctioning part
Reference Page
12
Self-diagnosis could not detect any malfunctions.
—
17*4
G sensor and circuit
18*1
Sensor rotor
21*1
Front right sensor (open-circuit)
22*1
Front right sensor (short-circuit)
25*1
Front left sensor (open-circuit)
26*1
Front left sensor (short-circuit)
31*1
Rear right sensor (open-circuit)
32*1
Rear right sensor (short-circuit)
35*1
Rear left sensor (open-circuit)
36*1
Rear left sensor (short-circuit)
41
Actuator front right outlet solenoid valve
42
Actuator front right inlet solenoid valve
45
Actuator front left outlet solenoid valve
46
Actuator front left inlet solenoid valve
55
Actuator rear outlet solenoid valve
56
Actuator rear inlet solenoid valve
57*2
Power supply (Low voltage)
61*3
Actuator motor or motor relay
63
Solenoid valve relay
71
Control unit
Warning lamp stays on when ignition
switch is turned ON.
Control unit power supply circuit
Warning lamp bulb circuit
Control unit or control unit connector
Solenoid valve relay stuck
Power supply for solenoid valve relay coil
ABS works frequently
—
Unexpected pedal action
—
Long stopping distance
—
ABS does not work
—
Pedal vibration and noise
—
Warning lamp does not come on
when ignition switch is turned ON.
Fuse, warning lamp bulb or warning lamp circuit
Control unit
Vehicle vibrates excessively when ABS is
operating.
ABS control unit to TCM circuit
*1: If one or more wheels spin on a rough or slippery road for 40 seconds or more, the ABS warning lamp will illuminate. This does not
indicate a malfunction. Only in the case of the short-circuit (Code Nos. 26, 22, 32 and 36), after repair the ABS warning lamp also illu-
minates when the ignition switch is turned ON. In this case, drive the vehicle at speeds greater than 30 km/h (19 MPH) for approxi-
mately 1 minute as specified in “SELF-DIAGNOSIS PROCEDURE”, BR-41. Check to ensure that the ABS warning lamp goes out while
the vehicle is being driven.
*2: The trouble code “57”, which refers to a low power supply voltage, does not indicate that the ABS control unit is malfunctioning. Do
not replace the ABS control unit with a new one.
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ABS
Malfunction Code/Symptom Chart
BR-54
*3: The trouble code “61” can sometimes appear when the ABS motor is not properly grounded. If it appears, be sure to check the con-
dition of the ABS motor ground circuit connection.
*4: 4WD models only
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ABS
Malfunction Code/Symptom Chart (Cont’d)
BR-55
Wheel Sensor or Rotor
DIAGNOSTIC PROCEDURE
NBBR0102
Malfunction code No. 21, 22, 25, 26, 31, 32, 35, 36 or 18
NOTE:
Wheel position should be distinguished by code No. except code
No. 18 (sensor rotor).
1
INSPECTION START
Wheel sensor inspection
SBR485E
©
GO TO 2.
2
CHECK CONNECTOR
1. Disconnect connectors from ABS actuator and electric unit and wheel sensor of malfunction code No. Check terminals
for damage or loose connection. Then reconnect connectors.
2. Carry out self-diagnosis again.
Does warning lamp activate again?
Yes
©
GO TO 3.
No
©
INSPECTION END
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS
ABS
Wheel Sensor or Rotor
BR-56
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