Infiniti M35/M45 Y50. Manual — part 1112
TROUBLE DIAGNOSIS
STC-5
[EPS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
TROUBLE DIAGNOSIS
PFP:00004
How to Perform Trouble Diagnosis
NGS000DX
BASIC CONCEPT
●
The most important point to perform trouble diagnosis is to understand systems (control and mechanism)
in vehicle thoroughly.
●
It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptom, and understand it fully.
Ask customer about his/her complaints carefully. In some cases,
they will be necessary to check symptom by driving vehicle with
customer.
CAUTION:
Customers are not professionals. Do not assume “maybe
customer means...” or “maybe customer mentioned this
symptom”.
●
It is essential to check symptoms right from beginning in order to
repair a malfunction completely.
For an intermittent malfunction, it is important to reproduce
symptom based on interview with customer and past examples.
Do not perform inspection on ad hoc basis. Most intermittent
malfunctions are caused by poor contacts. In this case, it will be
effective to shake suspected harness or connector by hand.
When repairs are performed without any symptom check, no
one can judge if malfunction has actually been eliminated.
●
Always read “GI General Information” to confirm general precau-
tions. Refer to
Component Parts Location
NGS000DY
SEF234G
SEF233G
1.
Power steering control unit
(Back of center console assembly)
2. Power steering solenoid valve
SGIA1105J
STC-6
[EPS]
TROUBLE DIAGNOSIS
Wiring Diagram — EPS —
NGS000DZ
TGWT0023E
TROUBLE DIAGNOSIS
STC-7
[EPS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
TGWT0024E
STC-8
[EPS]
TROUBLE DIAGNOSIS
Control Unit Input/Output Signal Standard
NGS000E0
STANDARD BY CIRCUIT TESTER AND OSCILLOSCOPE
CAUTION:
When checked using a circuit tester for voltage measurement, connector terminals should not be
forcefully extended.
Terminal
Measuring
point
Measuring condition
Standard
+ (wire color)
–
1 (GR)
Ground
IGN
Ignition switch ON.
Battery voltage (Approx. 12 V)
2 (B)
Ground
—
—
3 (L)
Vehicle speed
signal
(2-pulse)
At 40 km/h (25MPH)
5 (Y)
Engine
speed signal
At idle after warming up
At approx. 2,000 rpm
7 (G)
Power steer-
ing solenoid
valve
Normal
(Vehicle speed)
0 km/h (0 MPH)
Approx. 4.4 - 6.6 V
100 km/h (62 MPH)
Approx. 2.4 - 3.6 V
In fail-safe mode
(Engine speed)
0 - 1,500 rpm
Approx. 4.4 - 6.6 V
1,500 - 3,000 rpm
Approx. 3.5 V
More than 3,000 rpm
Approx. 2.1 V
ELF1080D
PBIA3654J
PBIA3655J
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