Infiniti QX56 (Z62). Manual — part 1264
STC-8
< ECU DIAGNOSIS INFORMATION >
POWER STEERING CONTROL UNIT
ECU DIAGNOSIS INFORMATION
POWER STEERING CONTROL UNIT
Reference Value
INFOID:0000000006256121
TERMINAL LAYOUT
PHYSICAL VALUES
JSGIA0023ZZ
Terminal No.
(Wire color)
Description
Condition
Value (Approx.)
+
-
Signal name
Input/
Output
1
(R)
Ground
Power steering solenoid
valve control 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
(GR)
Ground
Ignition switch power
supply
Input
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
5
(L)
Ground
Power steering solenoid
valve ground
—
Always
0 V
6
(B)
Ground
Ground
—
Always
0 V
8
(SB)
Ground
Vehicle speed signal
Input
Vehicle speed: 40 km/h (25 MPH)
CAUTION:
Check air pressure of tire under
standard condition.
NOTE:
The maximum voltage varies de-
pending on the specification
(destination unit).
JSNIA0015GB
POWER STEERING CONTROL UNIT
STC-9
< ECU DIAGNOSIS INFORMATION >
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CAUTION:
When using circuit tester or oscilloscope to measure voltage for inspection, be sure not to forcibly
extend any connector terminals.
Fail-Safe
INFOID:0000000006256122
EPS system
• 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.
• The power steering control unit controls the driving voltage to the
power steering solenoid valve for maintaining the power steering
assist force when the fail-safe function is activated. (The engine
speed signals control EPS system if any vehicle speed signal error
is detected.)
10
(B/SB)
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
Terminal No.
(Wire color)
Description
Condition
Value (Approx.)
+
-
Signal name
Input/
Output
JPBIA3352ZZ
JPBIA3354ZZ
JPGIB0022GB
Error area and root cause
Cancel condition
Engine speed is 1,500 rpm or more and there is no vehicle speed signal input for
over 10 seconds during vehicle travel.
• When a vehicle speed signal of 2 km/h (1.2
MPH) or more is inputted.
• Ignition switch is turned OFF to ON.
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 seconds.
STC-10
< WIRING DIAGRAM >
ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM
WIRING DIAGRAM
ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM
Wiring Diagram
INFOID:0000000006256123
JCGWM0392GB
ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM
STC-11
< WIRING DIAGRAM >
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JCGWM0393GB
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