Infiniti I30 (A33). Manual — part 122
2
CHECK CONNECTOR
1. Disconnect ABS actuator and electric unit connector. Check terminals for damage or loose connections. Then recon-
nect 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
1. Disconnect ABS actuator and electric unit connector.
2. Check voltage between ABS actuator and electric unit connector terminal 17 and ground.
SBR596E
Does battery voltage exist when ignition switch is turned ON?
Yes
©
GO TO 4.
No
©
GO TO 5.
4
CHECK ABS ACTUATOR AND ELECTRIC UNIT GROUND
Refer to ABS ACTUATOR AND ELECTRIC UNIT GROUND in Ground Circuit Check, BR-60.
Is ground circuit OK?
OK
©
Check ABS actuator and electric unit pin terminals for damage or the connection of ABS
actuator and electric unit harness connector. Reconnect ABS actuator and electric unit
harness connector. Then retest.
NG
©
Check the following.
I
Harness connector E9
I
Harness for open or short between ABS actuator and electric unit and ground
If NG, repair harness or connectors.
5
CHECK FUSE
Check 10A fuse 31 (Engine control) for control unit. Refer to POWER SUPPLY ROUTING in EL section.
Is fuse OK?
Yes
©
GO TO 6.
No
©
Replace fuse.
GI
MA
EM
LC
EC
FE
AT
AX
SU
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS
ABS
Low Voltage (Cont’d)
BR-71
6
CHECK ABS ACTUATOR AND ELECTRIC UNIT POWER SUPPLY CIRCUIT
Check continuity between battery and ABS actuator and electric unit connector terminal 17.
Does continuity exist?
Yes
©
Check battery. Refer to BATTERY in EL section.
No
©
Check the following.
I
Harness connector E9
I
Harness for open or short between ABS actuator and electric unit and fuse
If NG, repair harness or connectors.
Control Unit
NHBR0119
DIAGNOSTIC PROCEDURE
NHBR0119S01
Malfunction code No. 71
1
INSPECTION START
ABS actuator and electric unit power supply and ground circuit inspection
SBR597E
©
GO TO 2.
2
CHECK CONNECTOR
1. Disconnect ABS actuator and electric unit connector.
Check terminals for damage or loose connections. Then reconnect connectors.
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 “3. CHECK ABS ACTUATOR AND ELECTRIC UNIT POWER SUPPLY CIRCUIT” in “Low Voltage”,
BR-70.
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
©
Replace ABS actuator and electric unit.
No
©
Inspect the system according to the code No.
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS
ABS
Low Voltage (Cont’d)
BR-72
1. ABS Works Frequently
NHBR0120
1
CHECK BRAKE FLUID PRESSURE
Check brake fluid pressure distribution.
Refer to dual proportioning valve inspection in “DUAL PROPORTIONING VALVE”, BR-12.
Is brake fluid pressure distribution normal?
Yes
©
GO TO 2.
No
©
Perform Preliminary Check. Refer to BR-57.
2
CHECK WHEEL SENSOR
1. Check wheel sensor connector for terminal damage or loose connections.
2. Perform wheel sensor mechanical check.
Refer to “Wheel Sensor or Rotor”, BR-62.
Are wheel sensors functioning properly?
Yes
©
GO TO 3.
No
©
Repair.
3
CHECK FRONT AXLE
Check front and rear axles for excessive looseness. Refer to AX section, “Front Wheel Bearing”, “ON-VEHICLE SERVICE”
and “Rear Wheel Bearing”, “ON-VEHICLE SERVICE”.
Is front axle installed properly?
Yes
©
Go to “3. CHECK WARNING LAMP INDICATION” in “2. Unexpected Pedal Action”,
BR-73.
No
©
Repair.
2. Unexpected Pedal Action
NHBR0121
1
CHECK BRAKE PEDAL STROKE
Check brake pedal stroke. Is stroke excessively large?
SBR540A
Yes
©
Perform Preliminary Check. Refer to BR-57.
No
©
GO TO 2.
GI
MA
EM
LC
EC
FE
AT
AX
SU
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
ABS
1. ABS Works Frequently
BR-73
2
CHECK CONNECTOR AND PERFORMANCE
1. Disconnect ABS actuator and electric unit connector.
2. Check whether brake is effective.
OK or NG
Yes
©
GO TO 3.
No
©
Perform Preliminary Check. Refer to BR-57.
3
CHECK WARNING LAMP INDICATION
Ensure warning lamp remains off while driving.
SBR588E
Is warning lamp turned off?
Yes
©
GO TO 4.
No
©
Carry out self-diagnosis. Refer to BR-48, BR-50.
4
CHECK WHEEL SENSOR
1. Check wheel sensor connector for terminal damage or loose connection.
2. Perform wheel sensor mechanical check.
Is wheel sensor mechanism OK?
Yes
©
Check ABS actuator and electric unit pin terminals for damage or the connection of ABS
actuator and electric unit harness connector. Reconnect ABS actuator and electric unit
harness connector. Then retest.
No
©
Repair.
3. Long Stopping Distance
NHBR0122
1
CHECK CONNECTOR AND PERFORMANCE
1. Cancel ABS by disconnecting ABS actuator and electric unit connector.
2. Check whether stopping distance is still long.
OK or NG
OK
©
Perform Preliminary Check and air bleeding.
NG
©
Go to “3. CHECK WARNING LAMP INDICATION” in “2. Unexpected Pedal Action”,
BR-73.
TROUBLE DIAGNOSES FOR SYMPTOMS
ABS
2. Unexpected Pedal Action (Cont’d)
BR-74
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