Infiniti Q45. Manual — part 880
TROUBLE DIAGNOSIS FOR SYSTEM
STC-23
[WITHOUT 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 ACTIVE DAMPER SUSPENSION CONTROL UNIT AND POWER
STEERING SOLENOID VALVE
1.
Turn ignition switch “OFF”.
2.
Disconnect active damper suspension control unit harness connector and power steering solenoid valve
harness connector.
3.
Check continuity between active damper suspension control unit
harness connector (A) B37 terminal 21 and power steering sole-
noid 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 ACTIVE DAMPER SUSPENSION CONTROL UNIT
Check active damper suspension control unit input/output signal. Refer to
STC-12, "Active Damper Suspen-
sion Control Unit Input/Output Signal Reference Values"
OK or NG
OK
>> GO TO 6.
NG
>> Check active damper suspension 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.
SGIA1413E
STC-24
[WITHOUT REAR ACTIVE STEER]
TROUBLE DIAGNOSIS FOR SYSTEM
6.
STEERING WHEEL TURNING FORCE INSPECTION
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-17, "Disassembly and Assembly"
Engine Speed Signal
NGS0006A
●
Check the following if “flickering pattern for 31” is detected in self-diagnosis results without CONSULT-II.
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Data are reference value.
ACTIVE DAMPER SUSPENSION CONTROL UNIT TERMINALS AND REFERENCE VALUE
Data are reference value and are measured between each terminal and ground.
CAUTION:
When using a oscilloscope to measure voltage for inspection, be sure not to extend forcibly any connector terminal.
DIAGNOSTIC PROCEDURE
1.
CHECK DTC WITH ECM
Perform self-diagnosis with ECM. Refer to
EC-118, "SELF-DIAG RESULTS MODE"
.
Is any malfunction detected by self-diagnosis?
YES
>> Check the malfunctioning system.
NO
>> GO TO 2.
Monitored item
Content
Condition
Display value
ENGINE SPEED [rpm]
Engine speed
Engine stopped
0 rpm
Engine running
(Engine speed: 400 rpm or more)
Approximately
equal to the indica-
tion on tachometer
Terminal
Wire
color
Item
Condition
Data (Approx.)
12
W/G
Engine speed
Engine speed: At idle
(Warm-up condition)
Engine speed: Approx. 2,000 rpm
(Warm-up condition)
PBIA3654J
PBIA3655J
TROUBLE DIAGNOSIS FOR SYSTEM
STC-25
[WITHOUT REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
2.
CHECK ENGINE SPEED SIGNAL
With CONSULT-II
1.
Start engine.
2.
Select “DATA MONITOR” mode for “ACT D/SUS” with CONSULT-II.
3.
Read out the value of “ENGINE SPEED”.
Without CONSULT-II
1.
Start engine.
2.
Check signal between active damper suspension control unit
harness connector (A) terminal and ground with oscilloscope.
Also check harness for short to ground and short to power.
OK or NG
YES
>> GO TO 4.
NO
>> GO TO 3.
Condition
Display value
Engine stopped
0 rpm
Engine running
(Engine speed: 400 rpm or more)
Approximately
equal to the indica-
tion on tachometer
SEIA0779E
Connector
Terminal
Condition
Data (Approx.)
B37
12 -
Ground
Engine speed: At idle
(Warm-up condition)
Engine speed:
Approx. 2,000 rpm
(Warm-up condition)
SEIA0780E
PBIA3654J
PBIA3655J
STC-26
[WITHOUT REAR ACTIVE STEER]
TROUBLE DIAGNOSIS FOR SYSTEM
3.
CHECK HARNESS BETWEEN ECM AND ACTIVE DAMPER SUSPENSION CONTROL UNIT
1.
Turn ignition switch “OFF”.
2.
Disconnect ECM harness connector and active damper suspension control unit harness connector.
3.
Check continuity between ECM harness connector (A) F101 ter-
minal 103 and active damper suspension control unit harness
connector (B) B37 terminal 12.
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 ACTIVE DAMPER SUSPENSION CONTROL UNIT
Check active damper suspension control unit input/output signal. Refer to
STC-12, "Active Damper Suspen-
sion Control Unit Input/Output Signal Reference Values"
OK or NG
OK
>> GO TO 5.
NG
>> Check active damper suspension control unit pin terminals for damage or loose connection with
harness connector. If any items are damaged, repair or replace damaged parts.
5.
CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK
>> INSPECTION END
NG
>> Perform self-diagnosis with ECM again. Refer to
EC-118, "SELF-DIAG RESULTS MODE"
Continuity should exist.
SEIA0781E
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