Nissan Teana J32. Manual — part 1111
POWER STEERING CONTROL UNIT
STC-13
< ECU DIAGNOSIS >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
ECU DIAGNOSIS
POWER STEERING CONTROL UNIT
Reference Value
INFOID:0000000003893535
TERMINAL LAYOUT
PHYSICAL VALUES
JSGIA0023ZZ
Terminal No.
(Wire color)
Description
Condition
Value (Approx.)
+
-
Signal name
Input/
Output
1
(R/Y)
Ground
Power steering solenoid
valve voltage
Output
Vehicle speed: 0 km/h (0 MPH)
(Engine is running)
4.4 – 6.6 V
Vehicle speed: 100 km/h (62 MPH)
2.4 – 3.6 V
3
(G/W)
Ground
Ignition switch power
supply
Input
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
5
(LG)
Ground
Power steering solenoid
valve ground
—
Always
0 V
6
(B)
Ground
Ground
—
Always
0 V
8
(L/B)
Ground
Vehicle speed signal
Input
Vehicle speed: 40 km/h (25 MPH)
CAUTION:
Check air pressure of tire under
standard condition.
10
(V/W)
Ground
Engine speed signal
Input
Engine is running
• Warm-up condition
• Idle speed
Engine is running
• Warm-up condition
• Engine speed: Approx. 2,000 rpm
JSNIA0015GB
JSGIA0143ZZ
PBIA3655J
STC-14
< ECU DIAGNOSIS >
POWER STEERING CONTROL UNIT
CAUTION:
When using circuit tester or oscilloscope to measure voltage for inspection, be sure not to forcibly extend any connector ter-
minals.
Wiring Diagram - ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM -
INFOID:0000000003893536
JCGWM0089GB
POWER STEERING CONTROL UNIT
STC-15
< ECU DIAGNOSIS >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
Fail-Safe
INFOID:0000000003893835
EPS system
JCGWM0090GB
STC-16
< ECU DIAGNOSIS >
POWER STEERING CONTROL UNIT
• EPS system enters the fail-safe mode (that allows the steering
force to be controlled without impairing the drivability) if any of the
input/output values to/from EPS system (power steering control
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 ignition switch is turned
OFF
→
ON. EPS system restores the normal operation at that time.
JSGIA0426GB
Mode
Warn-
ing lamp
DTC
Detection point (malfunction part)
Error area and root 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.
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