Infiniti QX56 (Z62). Manual — part 157
POWER SUPPLY AND GROUND CIRCUIT
BRC-113
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
POWER SUPPLY AND GROUND CIRCUIT
Description
INFOID:0000000006222641
ABS actuator and electric unit (control unit) power supply
Diagnosis Procedure
INFOID:0000000006222642
1.
CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) IGNITION POWER SUPPLY (1)
1.
Turn the ignition switch OFF.
2.
Disconnect ABS actuator and electric unit (control unit) harness connector.
3.
Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
4.
Turn the ignition switch ON
CAUTION:
Never start engine.
5.
Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) IGNITION POWER SUPPLY CIRCUIT
(1)
1.
Turn the ignition switch OFF.
2.
Check 10A fuse (#57).
3.
Disconnect IPDM E/R harness connector.
4.
Check continuity between ABS actuator and electric unit (control unit) harness connector and IPDM E/R
harness connector.
5.
Check for continuity between ABS actuator and electric unit (control unit) harness connector and the
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.
3.
CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) IGNITION POWER SUPPLY (2)
1.
Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
ABS actuator and electric unit (control unit)
—
Voltage
Connector
Terminal
E36
18
Ground
Approx. 0 V
ABS actuator and electric unit (control unit)
—
Voltage
Connector
Terminal
E36
18
Ground
10
−
16 V
ABS actuator and electric unit (control unit)
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
E36
18
E15
59
Existed
ABS actuator and electric unit (control unit)
—
Continuity
Connector
Terminal
E36
18
Ground
Not existed
BRC-114
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
POWER SUPPLY AND GROUND CIRCUIT
2.
Turn the ignition switch ON
CAUTION:
Never start engine.
3.
Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) IGNITION POWER SUPPLY CIRCUIT
(2)
1.
Turn the ignition switch OFF.
2.
Check 10A fuse (#74).
3.
Check continuity and short circuit between ABS actuator and electric unit (control unit) harness connector
terminal (49) and 10A fuse (#74).
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.
5.
CHECK MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT
1.
Turn the ignition switch OFF.
2.
Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
3.
Turn the ignition switch ON.
CAUTION:
Never start engine.
4.
Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 6.
6.
CHECK MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT
1.
Turn the ignition switch OFF.
2.
Check 50A fusible link (M).
3.
Check continuity and short circuit between ABS actuator and electric unit (control unit) harness connector
terminal (4 and 47) and 50A fusible link (M).
ABS actuator and electric unit (control unit)
—
Voltage
Connector
Terminal
E37
49
Ground
Approx. 0 V
ABS actuator and electric unit (control unit)
—
Voltage
Connector
Terminal
E37
49
Ground
10
−
16 V
ABS actuator and electric unit (control unit)
—
Voltage
Connector
Terminal
E36
4
Ground
Battery voltage
E37
47
ABS actuator and electric unit (control unit)
—
Voltage
Connector
Terminal
E36
4
Ground
Battery voltage
E37
47
POWER SUPPLY AND GROUND CIRCUIT
BRC-115
< 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
>> Perform trouble diagnosis for battery power supply. Refer to
PG-11, "Wiring Diagram - BATTERY
NO
>> Repair or replace error-detected parts.
7.
CHECK ACTUATOR RELAY, ABS IN VALVE, ABS OUT VALVE, ANS CUT VALVE, SUCTION VALVE POW-
ER SUPPLY
1.
Turn the ignition switch OFF.
2.
Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
3.
Turn the ignition switch ON
CAUTION:
Never start engine.
4.
Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 8.
8.
CHECK ACTUATOR RELAY, ABS IN VALVE, ABS OUT VALVE, ANS CUT VALVE, SUCTION VALVE POW-
ER SUPPLY CIRCUIT
1.
Turn the ignition switch OFF.
2.
Check 30A fusible link (L).
3.
Check continuity and short circuit between ABS actuator and electric unit (control unit) harness connector
terminal (1) and 30A fusible link (L).
Is the inspection result normal?
YES
>> Perform trouble diagnosis for battery power supply. Refer to
PG-11, "Wiring Diagram - BATTERY
NO
>> Repair or replace error-detected parts.
9.
CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT
Check for continuity between ABS actuator and electric unit (control unit) harness connector and the ground.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair or replace error-detected parts.
10.
CHECK TERMINAL
• Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with har-
ness connector.
• Check IPDM E/R pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
>> INSPECTION END
ABS actuator and electric unit (control unit)
—
Voltage
Connector
Terminal
E36
1
Ground
Battery voltage
ABS actuator and electric unit (control unit)
—
Voltage
Connector
Terminal
E36
1
Ground
Battery voltage
ABS actuator and electric unit (control unit)
—
Continuity
Connector
Terminal
E36
2
Ground
Existed
3
E37
48
BRC-116
< DTC/CIRCUIT DIAGNOSIS >
[WITH VDC]
POWER SUPPLY AND GROUND CIRCUIT
NO
>> Repair or replace error-detected parts.
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