Infiniti QX56 (Z62). Manual — part 154
C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR
BRC-101
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK YAW RATE/SIDE/DECEL G SENSOR POWER SUPPLY CIRCUIT
1.
Turn the ignition switch OFF.
2.
Check 10A fuse (#57).
3.
Disconnect IPDM E/R harness connector.
4.
Check continuity between yaw rate/side/decel G sensor harness connector and IPDM E/R harness con-
nector.
5.
Check continuity between yaw rate/side/decel G sensor harness connector and ground.
Is the inspection result normal?
YES
>> Perform trouble diagnosis for ignition power supply. Refer to
PG-89, "Wiring Diagram - IGNITION
NO
>> Repair or replace error-detected parts.
4.
CHECK YAW RATE/SIDE/DECEL G SENSOR GROUND CIRCUIT
1.
Turn the ignition switch OFF.
2.
Check continuity between yaw rate/side/decel G sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
CHECK COMMUNICATION LINE (1)
1.
Disconnect ABS actuator and electric unit (control unit) harness connector.
2.
Check continuity between yaw rate/side/decel G sensor harness connector and ABS actuator and electric
unit (control unit) harness connector.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace error-detected parts.
Yaw rate/side/decel G sensor
—
Voltage
Connector
Terminal
M55
3
Ground
Battery voltage
Yaw rate/side/decel G sensor
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
M55
3
E15
59
Existed
Yaw rate/side/decel G sensor
—
Continuity
Connector
Terminal
M55
3
Ground
Not existed
Yaw rate/side/decel G sensor
—
Continuity
Connector
Terminal
M55
6
Ground
Existed
Yaw rate/side/decel G sensor
ABS actuator and electric unit (control unit)
Continuity
Connector
Terminal
Connector
Terminal
M55
4
E36
9
Existed
5
10
BRC-102
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR
6.
CHECK COMMUNICATION LINE (2)
1.
Connect ABS actuator and electric unit (control unit) harness connector.
2.
Check resistance between yaw rate/side/decel G sensor harness connector terminals.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace ABS actuator and electric unit (control unit). Refer to
BRC-137, "Removal and Installa-
.
7.
CHECK COMMUNICATION LINE (3)
1.
Disconnect ABS actuator and electric unit (control unit) harness connector.
2.
Check continuity between yaw rate/side/decel G sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair or replace error-detected parts.
8.
CHECK TERMINAL
• Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with har-
ness connector.
• Check yaw rate/side/decel G sensor pin terminals for damage or loose connection with harness connector.
• Check IPDM E/R pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair or replace error-detected parts.
9.
REPLACE YAW RATE/SIDE/DECEL G SENSOR
With CONSULT-III.
1.
Connect ABS actuator and electric unit (control unit) harness connector.
2.
Connect IPDM E/R harness connector.
3.
Replace yaw rate/side/decel G sensor. Refer to
BRC-138, "Removal and Installation"
4.
Erase Self-diagnosis result for “ABS”.
5.
Turn the ignition switch OFF.
6.
Turn the ignition switch ON.
CAUTION:
Never start engine.
7.
Perform self-diagnosis for “ABS”.
Is DTC “C1145” or “C1146” detected?
YES
>> Replace ABS actuator and electric unit (control unit). Refer to
BRC-137, "Removal and Installa-
.
NO
>> INSPECTION END
Yaw rate/side/decel G sensor
Resistance
Connector
Terminal
M55
4
100 – 140
Ω
5
Yaw rate/side/decel G sensor
Ground
Continuity
Connector
Terminal
M55
4
—
Not existed
5
C1155 BRAKE FLUID LEVEL SWITCH
BRC-103
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
C1155 BRAKE FLUID LEVEL SWITCH
DTC Logic
INFOID:0000000006222625
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
CHECK DTC DETECTION
With CONSULT-III.
1.
Turn the ignition switch OFF to ON, and then wait 1 minute or more.
2.
Perform self-diagnosis for “ABS”.
Is DTC “C1155” detected?
YES
>> Proceed to diagnosis procedure. Refer to
BRC-103, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006222626
1.
CHECK BRAKE FLUID LEVEL
1.
Turn the ignition switch OFF.
2.
Check brake fluid level. Refer to
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Refill brake fluid. Refer to
2.
CHECK BRAKE FLUID LEVEL SWITCH HARNESS
1.
Disconnect brake fluid level switch harness connector.
2.
Disconnect ABS actuator and electric unit (control unit) harness connector.
3.
Check continuity between brake fluid level switch harness connector and ABS actuator and electric unit
(control unit) harness connector.
4.
Check continuity between brake fluid level switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts.
3.
CHECK BRAKE FLUID LEVEL SWITCH GROUND
Check continuity between brake fluid level switch harness connector and ground.
DTC
Display Item
Malfunction detected condition
Possible causes
C1155
BR FLUID LEVEL LOW
• When brake fluid level low signal is detected.
• When an open circuit is detected in brake fluid level
switch circuit.
• Harness or connector
• ABS actuator and electric unit
(control unit)
• Brake fluid level switch
Brake fluid level switch
ABS actuator and electric unit (control unit)
Continuity
Connector
Terminal
Connector
Terminal
E47
1
E36
13
Existed
Brake fluid level switch
—
Continuity
Connector
Terminal
E47
1
Ground
Not existed
BRC-104
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
C1155 BRAKE FLUID LEVEL SWITCH
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK BRAKE FLUID LEVEL SWITCH
Check brake fluids level witch. Refer to
BRC-104, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace reservoir tank. Refer to
BR-30, "Disassembly and Assembly"
.
5.
CHECK TERMINAL
• Check brake fluid level switch pin terminals for damage or loose connection with harness connector.
• Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with har-
ness connector.
Is the inspection result normal?
YES
>> Replace ABS actuator and electric unit (control unit). Refer to
BRC-137, "Removal and Installa-
.
NO
>> Repair or replace error-detected parts.
Component Inspection
INFOID:0000000006222627
1.
CHECK BRAKE FLUID LEVEL SWITCH
1.
Turn the ignition switch OFF.
2.
Disconnect brake fluid level switch harness connector.
3.
Check resistance between terminals of brake fluid level switch.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace reservoir tank. Refer to
BR-30, "Disassembly and Assembly"
.
Brake fluid level switch
—
Continuity
Connector
Terminal
E47
2
Ground
Existed
Brake fluid level switch
Condition
Resistance
Terminal
1 – 2
When brake fluid level in reservoir tank is within the specified level.
1.9 – 2.1 k
Ω
When brake fluid level in reservoir tank is less than the specified
level.
1.0
Ω
or less
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