Nissan Qashqai J11. Manual — part 989
STC-16
< ECU DIAGNOSIS INFORMATION >
EPS CONTROL UNIT
ECU DIAGNOSIS INFORMATION
EPS CONTROL UNIT
Reference Value
INFOID:0000000010452106
VALUES ON THE DIAGNOSIS TOOL
NOTE:
• 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.
• The following table includes information (items) inapplicable to this vehicle. For information (items) applica-
ble to this vehicle, refer to CONSULT display items.
Monitor item
Data monitor
Condition
Display value
BATTERY VOLT
Ignition switch: ON
10.5 – 16 (V)
TORQUE SENSOR
Engine running
Steering wheel: Not steering (There is
no steering force)
Approx. 0.0 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)
0.00 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
Power steering warning lamp: ON
On
Power steering 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-17
< ECU DIAGNOSIS INFORMATION >
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*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
When EPS system operation conditions are not satisfied
Off1
When there is a malfunction in EPS system or Intelligent Parking
Assist
Off2
When assist torque is larger than command value from Intelligent
Parking Assist
Off3
Normal
On
IPA STATUS 1
When Intelligent Parking Assist is active
On
When Intelligent Parking Assist is inactive
Off
STOP/START SYSTEM
When stop/start system is active
On
When stop/start system is prohibited
Off
IPA STATUS 2
When Intelligent Parking Assist is inactive
Off
When Intelligent Parking System is active (steering wheel is not
turned)
On1
The following cases
• When Intelligent Parking Assist is active
• When steering wheel is turned
On2
IPA STATUS 3
When Intelligent Parking Assist is normal
NORMAL
When Intelligent Parking Assist malfunction occurs
MALF
IPA TARGET CURRENT
When Intelligent Parking Assist is active
0 – 70 (A)
EPS CONTROL CUR-
RENT
When EPS system is active
0 – 90 (A)
Monitor item
Data monitor
Condition
Display value
JSGIA1434ZZ
STC-18
< ECU DIAGNOSIS INFORMATION >
EPS CONTROL UNIT
Fail-safe
INFOID:0000000010452107
• If any malfunction occurs in the system and control unit detects the malfunction, power steering warning
lamp on combination meter turns ON to indicate system malfunction.
• When power steering warning lamp is ON, the system enters into a manual steering state. (Control turning
force steering wheel becomes heavy.)
Protection Function
INFOID:0000000010452108
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 reactivates by no steering.
DTC Inspection Priority Chart
INFOID:0000000010452109
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
0 V
9
(R)
Ground
Battery power supply
Input
Always
10.5 V – 16 V
10
(B)
Ground
Ground
—
Always
0 V
DTC
Fail-safe condition
C1601
The assist force is reduced according to the voltage, eventually ending with manual steering state
C1604
Manual steering state
C1606
C1607
C1608
C1609
Non-speed sensitive steering assist
U1000
• Non-speed sensitive steering assist
• Intelligent Parking Assist function (controlled from around view monitor) or Stop/Start system function (controlled
from ECM) is stopped
U1010
Normal control
U1970
Intelligent Parking Assist function (controlled from around view monitor) is stopped
Priority
Priority order item (DTC)
1
• U1000 CAN COMM CIRCUIT
• U1010 CONTROL UNIT(CAN)
2
• U1970 AVM
• C1609 CAN VHCL SPEED
3
C1601 BATTERY BOLT
4
• C1604 TORQUE SENSOR
• C1606 EPS MOTOR
• C1607 EPS EEPROM
• C1608 CONTROL UNIT
EPS CONTROL UNIT
STC-19
< ECU DIAGNOSIS INFORMATION >
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DTC Index
INFOID:0000000010452110
*: Even if DTC is detected, power steering warning lamp does not turns ON when assist torque is generated.
NOTE:
If two or more DTCs are detected, refer to
STC-18, "DTC Inspection Priority Chart"
.
DTC
Items (CONSULT screen terms)
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
AVM
OFF
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