Infiniti M45 (Y34). Manual — part 795
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
STC-5
[EPS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
TGWA0009E
STC-6
[EPS]
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
Control Unit Input/Output Signal Standard
AGS0003I
The standard values (voltage), measured with an analog tester in contact with control unit terminal, are shown
below:
Measuring
terminal
Measuring point
Standard value
+
–
1
Ground
Ignition switch ON or
START
Ignition switch ON
Battery voltage (approx. 12V)
2
Ground
—
0V
3
Vehicle speed signal
When the speed is very low, the
voltage fluctuates between
approximately 0V and approxi-
mately 5V or higher.
When vehicle speed is approx. 40 km/h (25 MPH)
5
Engine revolution signal
Engine is running
●
Warm-up condition
●
Engine idle speed
Engine is running
●
Warm-up condition
●
Engine speed is 2,000 rpm
7
Solenoid valve
Engine is running
Normal
0 km/h ((0 MPH) : Approx. 4.4 - 6.6V
100 km/h (62 MPH): Approx. 2.4 - 3.6V
When the fail-safe function is activated:
0 - 1,500 rpm : Approx. 4.4 - 6.6V
1,500 - 3,000 rpm : Approx. 3.5V
3,000 rpm or more : Approx. 2.1V
ELF1080D
PBIA3654J
PBIA3655J
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
STC-7
[EPS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
Trouble Diagnosis
AGS0003H
PRECAUTIONS FOR DIAGNOSIS
Intermittent incidents may be caused by malfunctioning harness, harness connector or terminal. Move har-
nesses, harness connectors or terminals by hand to make sure that there is no contact malfunction.
If a circuit tester for measuring voltage is used for check, be careful not to forcibly spread any connector termi-
nals.
INSPECTION BEFORE TROUBLE DIAGNOSIS
●
Check power steering fluid level and check for any leak. Refer to
DIAGNOSIS PROCEDURE
Symptom:
●
Heavy steering operation during stationary turns
●
Light steering operation during high-speed driving
Inspection procedure
1.
CHECK POWER STEERING CONTROL UNIT POWER CIRCUIT
1.
Disconnect power steering control unit harness connector.
2.
Check voltage between power steering control unit harness con-
nector M108 terminal 1 (GY) and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Check the following.
●
10A fuse [No.7, located in fuse block (J/B) No.1]
●
Harness for open or short between power steering
control unit and fuse.
●
If there is any non-standard condition, repair or
replace it.
2.
CHECK POWER STEERING CONTROL UNIT GROUND CIRCUIT
Check continuity between power steering control unit harness con-
nector M108 terminal 2 (B) and ground.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace power steering control unit ground
harness.
: Battery voltage should exist.
SGIA0328E
2 (B) - Ground
: Continuity should exist.
SGIA0329E
STC-8
[EPS]
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
3.
CHECK SOLENOID VALVE SIGNAL 1
1.
Connect power steering control unit harness connector.
2.
Start engine and gradually increase the vehicle speed from 0 to
100 km/h (0 to 62 MPH).
3.
Check voltage between power steering control unit harness con-
nector M108 terminal 7 (LG) and ground.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 9.
4.
CHECK SOLENOID VALVE SIGNAL 2
1.
When engine is running at idle, change the engine speed to
approximately 1,600 rpm and then to approximately 3,000 rpm.
2.
Check voltage between power steering control unit harness con-
nector M108 terminal 7 (LG) and ground.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 10.
5.
CHECK SOLENOID VALVE
●
Disconnect power steering control unit and solenoid valve con-
nectors.
●
Check continuity between power steering control unit harness
connector M108 terminal 7 (LG) and solenoid valve harness
connector F3 terminal 1 (LG).
OK or NG
OK
>> GO TO 6.
NG
>> Check harness for open or short between power steer-
ing control unit and solenoid valve.
6.
CHECK SOLENOID VALVE HARNESS
●
Check continuity between solenoid valve harness connector F3
terminal 2 (B) and ground.
OK or NG
OK
>> GO TO 7.
NG
>> Repair or replace solenoid valve ground harness.
: Make sure that voltage changes from approxi-
mately 5.5V to approximately 2.5V.
SGIA0330E
: Make that voltage changes from approximately
5.5V to approximately 2.1V in steps.
SGIA0331E
7 (LG) – 1 (LG)
: Continuity should exist.
SGIA0332E
2 (B) – Ground
: Continuity should exist.
SGIA0333E
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