Nissan Silvia. Instruction — part 97
5
FUSE CHECK
1. Disconnect ABS control unit connector.
2. Check continuity between battery and control unit F7 connector (body side) terminal 12 (GY/R).
Continuity should exist.
OK or NG
OK
©
Check battery. Refer to “BATTERY”, SC-3.
NG
©
Check the following.
I
Harness connector F7
I
Harness for open or short between ABS control unit and fuse
If NG, repair harness or connector.
GI
MA
EM
LC
EC
FE
CL
MT
AT
PD
AX
SU
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS
ABS
Low Voltage (Cont’d)
BR-71
Control Unit
DIAGNOSTIC PROCEDURE 6
=NMBR0108
1
INSPECTION START
ABS control unit power supply and ground circuit inspection
SBR839E
©
GO TO 2.
2
CHECK CONNECTOR
1. Disconnect control 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 CONTROL UNIT POWER SUPPLY CIRCUIT” in “DIAGNOSTIC PROCEDURE
5”, “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 or No
Yes
©
Replace ABS control unit.
No
©
Inspect the system according to the code No.
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS
ABS
Control Unit
BR-72
1. ABS Works Frequently
NMBR0109
1
CHECK BRAKE FLUID PRESSURE
Check brake fluid pressure distribution.
Refer to “Inspection”, “PROPORTIONING VALVE”, BR-11.
Is brake fluid pressure distribution normal?
Yes
©
GO TO 2.
No
©
Repair. Then perform Preliminary Check.
Refer to BR-50.
2
CHECK WHEEL SENSOR
1. Check wheel sensor connector for terminal damage or loose connections.
2. Perform wheel sensor mechanical check.
Refer to “7. CHECK SENSOR ROTOR” in “DIAGNOSTIC PROCEDURE 1”, “Wheel Sensor or Rotor”, BR-54.
Is wheel sensor mechanism OK?
Yes
©
GO TO 3.
No
©
Repair.
3
CHECK FRONT AXLE
Check front axles for excessive looseness. Refer to AX-3, “Front Wheel Bearing”.
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
NMBR0110
1
CHECK BRAKE PEDAL STROKE
Check brake pedal stroke.
SBR540A
Is brake pedal stroke excessively large?
Yes
©
Perform Preliminary Check. Refer to BR-50.
No
©
GO TO 2.
GI
MA
EM
LC
EC
FE
CL
MT
AT
PD
AX
SU
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
ABS
1. ABS Works Frequently
BR-73
2
CHECK MECHANICAL BRAKE SYSTEM PERFORMANCE
Disconnect ABS actuator connector and check whether brake is effective.
Does brake system function properly when brake pedal is depressed?
Yes
©
GO TO 3.
No
©
Perform Preliminary Check. Refer to BR-50.
3
CHECK WARNING LAMP INDICATION
Ensure warning lamp remains off while driving.
SBR803E
Is warning lamp turned off?
Yes
©
GO TO 4.
No
©
Carry out self-diagnosis. Refer to BR-44.
4
CHECK WHEEL SENSOR
1. Check wheel sensor connector for terminal damage or loose connection.
2. Perform wheel sensor mechanical check. Refer to “7. CHECK SENSOR ROTOR” in “DIAGNOSTIC PROCEDURE 1”,
“Wheel Sensor or Rotor”, BR-54.
Is wheel sensor mechanism OK?
Yes
©
Check ABS control unit pin terminals for damage or the connection of ABS control unit
harness connector.
Reconnect ABS control unit harness connector.
Then retest.
No
©
Repair.
TROUBLE DIAGNOSES FOR SYMPTOMS
ABS
2. Unexpected Pedal Action (Cont’d)
BR-74
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