Infiniti Q45. Manual — part 894
TROUBLE DIAGNOSIS FOR SYSTEM
STC-79
[WITH REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
3.
CHECK POWER STEERING SOLENOID VALVE
1.
Turn ignition switch “OFF”.
2.
Disconnect power steering solenoid valve harness connector.
3.
Check resistance between power steering solenoid valve con-
nector (A) terminals 1 and 2.
4.
Check power steering solenoid valve connector (A) by listening
for its operation sound while applying battery voltage to power
steering solenoid valve connector (A) terminals 1 (positive) and
2 (negative).
OK or NG
OK
>> GO TO 4.
NG
>> Replace power steering solenoid valve. Refer to
4.
CHECK HARNESS BETWEEN RAS CONTROL UNIT AND POWER STEERING SOLENOID VALVE
1.
Turn ignition switch “OFF”.
2.
Disconnect RAS control unit harness connector and power steering solenoid valve harness connector.
3.
Check continuity between RAS control unit harness connector
(A) B39 terminal 36 and power steering solenoid valve harness
connector (B) F3 terminal 1.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged parts.
5.
CHECK RAS CONTROL UNIT
Check RAS control unit input/output signal. Refer to
STC-47, "RAS Control Unit Input/Output Signal Refer-
.
OK or NG
OK
>> GO TO 6.
NG
>> Check RAS control unit pin terminals for damage or loose connection with harness connector. If
any item is damaged, repair or replace damaged parts.
1 - 2
: Approx. 4 - 6
Ω
SGIA1412E
SGIA1419E
Continuity should exist.
SGIA1490E
STC-80
[WITH REAR ACTIVE STEER]
TROUBLE DIAGNOSIS FOR SYSTEM
6.
CHECK STEERING WHEEL TURNING FORCE
Check steering wheel turning force. Refer to
PS-8, "STEERING WHEEL TURNING FORCE"
OK or NG
OK
>> INSPECTION END
NG
>> Check relief oil pressure of power steering oil pump and power steering gear. If any item is dam-
aged, repair or replace damaged parts. Refer to
(power steer-
ing oil pump) and
PS-28, "Disassembly and Assembly"
Stop Lamp Switch
NGS0008Q
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Data are reference value.
RAS CONTROL UNIT TERMINALS AND REFERENCE VALUE
Data are reference value and are measured between each terminal and ground.
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminal.
DIAGNOSTIC PROCEDURE
1.
CHECK STOP LAMP SIGNAL
With CONSULT-II
1.
Start engine.
2.
Select “DATA MONITOR” mode for “RAS/HICAS” with CONSULT-II.
3.
Read out the value of “STOP LAMP SW”.
Without CONSULT-II
1.
Start engine.
2.
Check signal between RAS control unit harness connector (A)
terminal and ground.
OK or NG
OK >> GO
TO
5.
NG
>> GO TO 2.
Monitored item
Content
Condition
Display value
STOP LAMP SW [ON/OFF]
Stop lamp condition
Brake pedal: Depressed
ON
Brake pedal: Released
OFF
Terminal
Wire
color
Item
Condition
Data (Approx.)
22
L/B
Stop lamp switch
Brake pedal: Depressed
Battery voltage
Brake pedal: Released
0 V
Condition
Display value
Brake pedal: Depressed
ON
Brake pedal: Released
OFF
SGIA1491E
Connector
Terminal
Condition
Data (Approx.)
B39
22 -
Ground
Brake pedal: Depressed
Battery voltage
Brake pedal: Released
0 V
SGIA1492E
TROUBLE DIAGNOSIS FOR SYSTEM
STC-81
[WITH REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
2.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1.
Turn ignition switch “OFF”.
2.
Disconnect stop lamp switch harness connector.
3.
Turn ignition switch “ON”. (Do not start engine.)
4.
Check voltage between stop lamp switch harness connector (A)
M402 terminal 3 and ground.
OK or NG
OK
>> GO TO 3.
NG
>> Check the following. If any items are damaged, repair or
replace damaged parts.
●
10A fuse [No. 17, located in the fuse block (J/B)
No.1]. Refer to
●
Harness for short or open between battery and stop lamp switch harness connector M402 ter-
minal 3.
3.
CHECK HARNESS BETWEEN RAS CONTROL UNIT AND STOP LAMP SWITCH
1.
Turn ignition switch “OFF”.
2.
Disconnect RAS control unit harness connector and stop lamp switch harness connector.
3.
Check continuity between RAS control unit harness connector
(A) B39 terminal 22 and stop lamp switch harness connector (B)
M402 terminal 4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.
4.
CHECK STOP LAMP SWITCH
1.
Turn ignition switch “OFF”.
2.
Disconnect stop lamp switch harness connector.
3.
Remove stop lamp switch.
4.
Push and release stop lamp switch and check continuity
between stop lamp switch connector (A) M402 terminals 3 and
4.
OK or NG
OK
>> GO TO 5.
NG
>> Replace back-up lamp switch.
Connector
Terminal
Voltage (Approx.)
M402
3 - Ground
Battery voltage
SGIA1493E
Continuity should exist.
SGIA1495E
Terminal
Condition
Continuity
3 - 4
Push stop lamp switch
Yes
Release stop switch
No
SGIA1497E
STC-82
[WITH REAR ACTIVE STEER]
TROUBLE DIAGNOSIS FOR SYSTEM
5.
CHECK RAS CONTROL UNIT
Check RAS control unit input/output signal. Refer to
STC-47, "RAS Control Unit Input/Output Signal Refer-
.
OK or NG
OK
>> INSPECTION END
NG
>> Check RAS control unit pin terminals for damage or loose connection with harness connector. If
any items are damaged, repair or replace damaged parts.
Component Inspection
NGS000CU
RAS MOTOR
1.
Turn ignition switch “OFF”.
2.
Disconnect RAS motor harness connector.
3.
Remove RAS motor. Refer to
.
4.
Check operation by supply 6 V (B) voltage to RAS motor con-
nector (A) terminals 1 and 2.
CAUTION:
●
Never supply 12 V voltage (battery, etc.) to the RAS
motor.
●
Never operate RAS motor for more than 1 second.
●
Be careful not to overheat the harness.
5.
Check continuity between RAS motor connector (A) B82 termi-
nals 1 and 2.
6.
If NG, replace the RAS motor.
RAS MOTOR RELAY
1.
Turn ignition switch “OFF”.
2.
Remove RAS motor relay. Refer to
STC-41, "Component Parts Location"
.
3.
Apply 12 V direct current between RAS motor relay connector
B42 terminals 1 and 2.
4.
Check continuity between RAS motor relay connector B42 ter-
minals 3 and 5.
5.
Check continuity between RAS motor relay connector B42 ter-
minals 1 and 2.
6.
If NG, replace the RAS motor relay.
Terminal
Actuator motor
1 (Positive) - 2 (Negative)
Clockwise rotate
2 (Positive) - 1 (Negative)
Counterclockwise rotate
1 – 2
: Approx. 0.45
Ω
SGIA1473E
SGIA1474E
Terminal
Condition
Continuity
3 - 5
1 2 V direct current supply between terminals 1 and 2
Yes
OFF
No
1 – 2
: 74
Ω
SGIA1286E
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