Infiniti G37 Coupe. Manual — part 1242
POWER STEERING CONTROL UNIT
STC-19
< ECU DIAGNOSIS >
[WITHOUT 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
JCGWA0047GB
STC-20
< ECU DIAGNOSIS >
[WITHOUT 4WAS]
POWER STEERING CONTROL UNIT
Fail Safe
INFOID:0000000001666282
EPS system
JCGWA0048GB
POWER STEERING CONTROL UNIT
STC-21
< ECU DIAGNOSIS >
[WITHOUT 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
• EPS system enters the fail-safe mode (that allows the steering
force to be controlled without impairing the drive ability) if any of
the input/output values to/from EPS system (power steering con-
trol unit) deviate from the standard range.
NOTE:
The system enters the fail-safe mode if the engine speed remains
at 1,500 rpm or more for over 10 seconds while the vehicle is
stopped. This is normal.
• The fail-safe function is canceled when a vehicle speed signal of 2
km/h (1.2 MPH) or more is inputted or the key switch is turned
OFF
→
ON. EPS system restores the normal operation at that time.
JSGIA0114GB
Function
Warn-
ing lamp
DTC No.
Detection point (malfunction part)
Malfunction part and cause
Fail-safe
function
—
—
Vehicle speed signal input
• Engine speed is 1,500 rpm or more and there is no vehicle
speed signal input for over 10 seconds during vehicle travel.
• Vehicle speed signal has abruptly dropped from 30 km/h (19
MPH) or more to 2 km/h (1.2 MPH) or less within 1.4 sec-
onds.
STC-22
< SYMPTOM DIAGNOSIS >
[WITHOUT 4WAS]
UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)
SYMPTOM DIAGNOSIS
UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIA-
TION)
Description
INFOID:0000000001666283
• Hard steering when fully turning the steering wheel.
• Light steering when driving at a high speed.
Diagnosis Procedure
INFOID:0000000001666284
1.
CHECK SYSTEM FOR POWER SUPPLY AND GROUND
Perform trouble diagnosis for power supply and ground. Refer to
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace damaged parts.
2.
CHECK SYSTEM FOR VEHICLE SPEED SIGNAL
Perform trouble diagnosis for vehicle speed signal. Refer to
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace damaged parts.
3.
CHECK SYSTEM FOR ENGINE SPEED SIGNAL
Perform trouble diagnosis for engine speed signal. Refer to
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace damaged parts.
4.
CHECK SYSTEM FOR POWER STEERING SOLENOID VALVE
Perform trouble diagnosis for power steering solenoid valve. Refer to
Is the inspection result normal?
YES
>> Perform the symptom diagnosis for the steering system. Refer to
.
NO
>> Repair or replace damaged parts.
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