Nissan X-Trail 32. Instruction — part 1992
STC-18
< ECU DIAGNOSIS INFORMATION >
EPS CONTROL UNIT
ECU DIAGNOSIS INFORMATION
EPS CONTROL UNIT
Reference Value
INFOID:0000000010688408
VALUES ON THE DIAGNOSIS TOOL
CAUTION:
The output signal indicates the EPS control unit calculation data. The normal values will be displayed
even in the event that the output circuit (harness) is open.
NOTE:
The following table includes information (items) inapplicable to this vehicle. For information (items) applicable
to this vehicle, refer to CONSULT display items.
Monitor item
Data monitor
Condition
Value/Status
BATTERY VOLT
Ignition switch: ON
10.5 V – 16 V
TORQUE SENSOR
Engine running
Steering wheel: Not steering (There is
no steering force)
Approx. 0 Nm
Steering wheel: Right turn
Positive value (Nm)
Steering wheel: Left turn
Negative value (Nm)
MOTOR CURRENT
Engine running
Steering wheel: Not steering (There is
no steering force)
Approx. 0 A
Steering wheel: Right or left turn
Displays consumption current of
EPS motor (A)
*1
MOTOR SIG
Engine running
Steering wheel: Not steering (There is
no steering force)
Approx. 0 A
Steering wheel: Right turn
Positive value (A)
Steering wheel: Left turn
Negative value (A)
ASSIST TORQUE
Engine running
Steering wheel: Not steering (There is
no steering force)
Approx. 0 Nm
Steering wheel: Right turn
Positive value (Nm)
Steering wheel: Left turn
Negative value (Nm)
C/U TEMP
Ignition switch ON or engine running
Displays temperature of inside of
EPS control unit [
°
C (
°
F)]
ASSIST LEVEL
Engine running
100 %
*2
VEHICLE SPEED
Vehicle stopped
0 km/h (0 mph)
While driving
Approximately equal to the indication
on speedometer
*3
(inside of
±
10%)
WARNING LAMP
EPS warning lamp: ON
On
EPS warning lamp: OFF
Off
ENGINE STATUS
Engine not running
Stop
Engine running
Run
ST TORQUE STATUS
Engine running
Steering wheel: Not steering (There is
no steering force)
Off
Steering wheel: Right or left turn
On
EPS ASSIST PERMIS
Engine running
Status other than stop/start system
On
In stop/start system operation
Off
EPS CONTROL UNIT
STC-19
< ECU DIAGNOSIS INFORMATION >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
*1: Almost in accordance with the value of “MOTOR SIG”. It is not a malfunction though these values are not
accorded when steering quickly.
*2: Normally displays 100%. In case of an excessive stationary steering, the assist curvature gradually falls.
However, it returns to 100% when left standing.
*3: It is not a malfunction, though it might not be corresponding just after ignition switch in turned ON.
TERMINAL LAYOUT
PHYSICAL VALUES
STOP/START STATUS
When stop/start system is inactive
INACT
When stop/start system is restarting
AUTO ST
When stop/start system is active
ACT
When stop/start system is interrupted
CANCEL
IPA ON
EPS system operating conditions are not satisfied
Off1
EPS system or around view monitor with park assist is abnormal
Off2
Assist torque is larger than a command value from around view
monitor with park assist
Off3
Normal condition
On
IPA STATUS 1
Around view monitor with park assist is in operation
On
Around view monitor with park assist is not in operation
Off
STOP/START SYSTEM
When stop/start system is active
On
When stop/start system is prohibited
Off
IPA STATUS 2
Around view monitor with park assist is not in operation
Off
Around view monitor with park assist is in operation (steering
wheel is not turned)
On1
The following cases
• Around view monitor with park assist in operation
• Steering wheel is turned
• Sonar is not operation
On2
The following cases
• Around view monitor with park assist in operation
• Steering wheel is turned
• Sonar is operation
On3
IPA STATUS 3
Around view monitor with park assist is normal
NORMAL
Around view monitor with park assist is abnormal
MALF
IPA TARGET CURRENT
Around view monitor with park assist is in operation
0 – 70(A)
EPS CONTROL CUR-
RENT
EPS system is in operation
0 – 90 (A)
Monitor item
Data monitor
Condition
Value/Status
JSGIA1434ZZ
STC-20
< ECU DIAGNOSIS INFORMATION >
EPS CONTROL UNIT
Fail-Safe
INFOID:0000000010688409
• If any malfunction occurs in the system and control unit detects the malfunction, Electric power steering
warning lamp on combination meter turns ON to indicate system malfunction.
• When Electric power steering warning lamp is ON, the system enters into a instruction steering state. (Control
turning force steering wheel becomes heavy.)
Protection Function
INFOID:0000000010688410
EPS control unit decreases the output signal to EPS motor while extremely using the power steering function
(e.g., full steering) consecutively for protecting EPS motor and EPS control unit (Overload protection control).
While activating overload protection control, the assist torque gradually decreases, and the steering wheel
turning force becomes heavy. The normal assist torque is recovered if the steering wheel is not turned for a
while.
DTC Inspection Priority Chart
INFOID:0000000010688411
When multiple DTCs are detected simultaneously, check one by one depending on the following priority list.
Terminal No.
(Wire Color)
Description
Condition
Value
(Approx.)
+
−
Signal name
Input/Output
1
(P)
—
CAN-L
Input/Output
—
—
2
(L)
—
CAN-H
Input/Output
—
—
4
(SB)
Ground
Ignition power supply
Input
Ignition switch: ON
10.5 V – 16 V
Ignition switch: OFF
Approx. 0 V
9
(R)
Ground
Battery power supply
Input
Always
10.5 V – 16 V
10
(B)
Ground
Ground
—
Always
Approx. 0 V
DTC
Fail-safe condition
C1601
Assist is reduced according to voltage, resulting in instruction steering state.
C1604
Instruction steering state.
C1606
C1607
C1608
C1609
Constant steering assist level state
U1000
Normal control
NOTE:
If the cause is in a different ECU, the state changes to fixed steering assist force.
U1010
Normal control
U1970
Around view monitor with park assist function stops (controlled by around view monitor).
U1971
Around view monitor with park assist function stops (controlled by sonar).
Priority
Priority order item (DTC)
1
• U1000 CAN COMM CIRCUIT
• U1010 CONTROL UNIT (CAN)
2
• U1970 AROUND VIEW MONITOR SYSTEM
• U1971 SONAR SYSTEM
• C1609 CAN VHCL SPEED
EPS CONTROL UNIT
STC-21
< ECU DIAGNOSIS INFORMATION >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
DTC Index
INFOID:0000000010688412
*: Even if DTC is detected, electric power steering warning lamp does not turns ON when assist torque is gen-
erated.
3
C1601 BATTERY VOLT
4
• C1604 TORQUE SENSOR
• C1606 EPS MOTOR
• C1607 EEPROM
• C1608 CONTROL UNIT
Priority
Priority order item (DTC)
DTC
Items
Electric power steering warning lamp
Reference
C1601
BATTERY VOLT
ON
C1604
TORQUE SENSOR
ON
C1606
EPS MOTOR
ON
C1607
EEPROM
OFF
C1608
CONTROL UNIT
ON / OFF
*
C1609
CAN VHCL SPEED
OFF
U1000
CAN COMM CIRCUIT
OFF
U1010
CONTROL UNIT (CAN)
OFF
U1970
AROUND VIEW MONITOR
OFF
U1971
SONAR
OFF
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