Nissan Pathfinder. Manual — part 1123
SYSTEM
STC-9
< SYSTEM DESCRIPTION >
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HYDRAULIC PUMP ELECTRIC POWER STEERING SYSTEM : Protection Function
INFOID:0000000009177128
• When the steering wheel is operated repeatedly or turned all the way for a long period during parking or low
speed driving, the function of the hydraulic pump electric power steering system becomes limited to prevent
the system from overheating. Continued operation of the steering wheel will cause the hydraulic pump elec-
tric power steering system to stop and the hydraulic pump electric power steering system warning lamp may
come ON. In this case, the steering wheel operation temporarily becomes hard. This is not a malfunction.
When the engine is turned OFF (ignition switch OFF) and steering operation is stopped for a while, the tem-
perature of the hydraulic pump electric power steering system decreases and the steering operation returns
to normal after restarting the engine.
• Then, the hydraulic pump electric power steering system warning lamp turns OFF. If the system is OFF
under the protection state, the hydraulic pump electric power steering system warning lamp turns ON to
warn that the system is in the manual steering state. (This is not a system malfunction.) In addition, the fol-
lowing DTC remains to distinguish from malfunction.
C1608
Manual steering state
U1000
Normal control
NOTE:
If the cause is in a different ECU, the state changes to fixed steering assist force.
DTC
Fail-safe condition
DTC
vehicle condition
C160A
The system temporarily enters the manual steering state. (This is not a hydraulic pump electric
power steering system malfunction.)
STC-10
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (POWER STEERING CONTROL MODULE)
DIAGNOSIS SYSTEM (POWER STEERING CONTROL MODULE)
CONSULT Function
INFOID:0000000009177129
CAUTION:
After disconnecting the CONSULT vehicle interface (VI) from the data link connector, the ignition must
be cycled OFF
→ ON (for at least 5 seconds) → OFF. If this step is not performed, the BCM may not go
to "sleep mode", potentially causing a discharged battery and a no-start condition.
FUNCTION
CONSULT can display each diagnostic item using the diagnostic test modes shown as per the following.
ECU IDENTIFICATION
Displays the part number stored in the control unit.
SELF-DIAG RESULTS MODE
.
When “CRNT” is displayed on self-diagnosis result.
• The system is presently malfunctioning.
When “PAST” is displayed on self-diagnosis result.
• System malfunction in the past is detected, but the system is presently normal.
DATA MONITOR MODE
Diagnostic test mode
Function
ECU identification
The part number stored in the control unit can be read.
Self Diagnostic Results
Self-diagnostic results and freeze frame data can be read and erased quickly.
Data monitor
Input/Output data in the power steering control module can be read.
Monitor item (Unit)
Remarks
BATTERY VOLT (V)
Displays the power supply voltage for power steering control module.
STR ANG SPD (deg/s)
Displays the steering angle speed based on the steering angle signal transmitted by
CAN communications.
MOTOR CURRENT (A)
Displays the current value consumed by power steering control module.
MTR REV SPD COMM (rpm)
Displays the power steering motor speed command value.
MTR REV SPD (rpm)
Displays the power steering motor speed.
C/U TEMP (
°C or °F)
Displays the temperature of the power steering control module.
C/U TEMP A (
°C or °F)
Displays the temperature of the power steering control module.
MTR ASSIST (%)
Displays the current percentage of the allowable assist ratio power steering motor.
ESTM VHCL SPD (km/h or mph)
Displays the vehicle speed calculated by the power steering control module.
WARNING LAMP (On/Off)
Hydraulic pump electric power steering system warning lamp control status is displayed.
ENGINE STATUS (STOP/RUN/CRANK)
Engine speed is displayed from engine condition signal with CAN communication
VHCL SPD JUDGE (OK/NG)
Displays the receiving status of the vehicle speed signal transmitted by CAN communi-
cations.
POWER STEERING CONTROL MODULE
STC-11
< ECU DIAGNOSIS INFORMATION >
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ECU DIAGNOSIS INFORMATION
POWER STEERING CONTROL MODULE
Reference Value
INFOID:0000000009177130
VALUES ON THE DIAGNOSIS TOOL
*1: The value changes according to load of power steering motor.
*2: This is in close agreement with a motor speed command value. Although a quick steering operation may
cause disagreement, this is not a malfunction.
*3: Usually, 100% is displayed. An excessive steering operation gradually lowers the percentage. When left
standing, the percentage returns to 100%.
*4: This may not agree with the speedometer indication immediately after the ignition switch is turned ON. This
is not a malfunction.
Monitor item
Data monitor
Condition
Display value
BATTERY VOLT
Engine running
Battery voltage (V)
STR ANG SPD
The steering wheel is not steered.
Approx. 0.0 deg/s
The steering wheel is steered.
Displays steering angle speed (deg/s)
MOTOR CURRENT
Engine running
Steering wheel: Not steering (There is
no steering force)
MAX approx. 10 A
*1
Steering wheel: Right or left turn
Displays consumption current of pow-
er steering control module (A)
MTR REV SPD COMM
Engine running
Steering wheel: Not steering (There is
no steering force)
Shows an almost constant value
(rpm)
Steering wheel: Right or left turn
The value changes as a steering
speed (rpm)
MTR REV SPD
Engine running
Steering wheel: Not steering (There is
no steering force)
Shows an almost constant value
(rpm)
*2
Steering wheel: Right or left turn
The value changes as a steering
speed (rpm)
*2
C/U TEMP
Engine running
Displays temperature of inside of
power steering control module (
°C or
°F)
C/U TEMP A
Engine running
Displays temperature of inside of
power steering control module (
°C or
°F)
MTR ASSIST
Engine running
100%
*3
ESTM VHCL SPD
Vehicle stopped
0.00 km/h or mph
While driving
Approximately equal to the indication
on speedometer
*4
(inside of
±10%)
WARNING LAMP
Hydraulic pump electric power steering warning lamp: ON
On
Hydraulic pump electric power steering warning lamp: OFF
Off
ENGINE STATUS
Engine not running
STOP
Engine running
RUN
Engine cranking
CRANK
VHCL SPD JUDGE
Vehicle speed signal can be received via CAN communication
OK
Vehicle speed signal cannot be received via CAN communica-
tion
NG
STC-12
< ECU DIAGNOSIS INFORMATION >
POWER STEERING CONTROL MODULE
TERMINAL LAYOUT
PHYSICAL VALUES
Fail-safe
INFOID:0000000009177131
When an error occurs in the hydraulic pump electric power steering system, fail-safe brings the system to a
halt (manual steering) or restricted (constant steering assist level) state. When the system is in a halt state,
fail-safe turns ON the hydraulic pump electric power steering warning lamp to warn the driver that the hydrau-
lic pump electric power steering system is in the manual steering state.
Protection Function
INFOID:0000000009177132
• When the steering wheel is operated repeatedly or turned all the way for a long period during parking or low
speed driving, the function of the hydraulic pump electric power steering system becomes limited to prevent
the system from overheating. If the steering wheel is operated further more, the hydraulic pump electric
power steering system stops and the hydraulic pump electric power steering system warning lamp may be
turned ON. In this case, the steering wheel operation temporarily becomes hard. This is not a malfunction.
When the engine is turned OFF (ignition switch OFF) and steering operation is stopped for a while, the tem-
perature of the hydraulic pump electric power steering system decreases and the steering operation returns
to normal after restarting the engine.
• Then, the hydraulic pump electric power steering system warning lamp turns OFF. If the system is OFF
under the protection state, the hydraulic pump electric power steering system warning lamp turns ON to
JSGIA0835ZZ
Terminal No.
(Wire Color)
Description
Condition
Value
(Approx.)
+
−
Signal name
Input/Output
1
(W)
Ground
Battery power supply
Input
Always
Battery voltage
2
(W)
Ground
Ground
—
Always
0 V
5
(BR)
Ground
Ignition power supply
Input
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
7
(P)
—
CAN-L
Input/Output
—
—
8
(L)
—
CAN-H
Input/Output
—
—
DTC
Fail-safe condition
C1143
Certain steering assist force
C1601
Manual steering state
C1606
Manual steering state
C1607
Certain steering assist force
C1608
Manual steering state
U1000
Normal control
NOTE:
If the cause is in a different ECU, the state changes to fixed steering assist force.
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