ECU NISSAN LATIO 2011 Service Repair Manual

EPS CONTROL UNITSTC-21
< ECU DIAGNOSIS INFORMATION > [EPS]
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Te r m i n a l N o . (Wire Color) Description
ConditionVa l u e
(Approx.)
+ − Signal name Input/Output
4
(V) Ground Torque sensor sub Input Ignition switch: ON
Steering wheel: Not
steering (There is no
steering force) 2.5 V
Engine running Steering wheel: steer-
ing 1.6 V – 3.4 V
(The value is changed according to steering
left or right)
5
(BR −) Ground
Torque sensor power
supply Output
Ignition switch: ON 5 V
6
(− ) Ground Torque sensor main Input Ignition switch: ON
Steering wheel: Not
steering (There is no
steering force) 2.5 V
Engine running Steering wheel: steer-
ing 1.6 V – 3.4 V
(The value is changed according to steering
left or right)
7
(R) Ground Torque sensor ground —
Always0 V
9
(L) Ground CAN-H
Input/Output ——
10
(O) Ground Ignition power supply Input Ignition switch: ON
Battery voltage
Ignition switch: OFF 0 V
16
(P) Ground CAN-L
Input/Output ——
17
(R) Ground Battery power supply Input
AlwaysBattery voltage
18
(B) Ground Ground
—Always 0 V
19 — Motor —— —
20 — Motor —— —
Revision: May 2010
2011 Versa

STC-22
< ECU DIAGNOSIS INFORMATION >[EPS]
EPS CONTROL UNIT
Wiring Diagram - ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM -
INFOID:0000000005931255
ABGWA0024GB
Revision: May 2010 2011 Versa

EPS CONTROL UNITSTC-23
< ECU DIAGNOSIS INFORMATION > [EPS]
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Fail-SafeINFOID:0000000005931256
• If any malfunction occurs in the system, and control unit detects the malfunction, EPS warning lamp on com- bination meter turns ON to indicate system malfunction.
• When EPS warning lamp is ON, enters into a manual steering state. (Control turning force steering wheel
becomes heavy.)
AAGWA0003GB
Revision: May 2010 2011 Versa

STC-24
< ECU DIAGNOSIS INFORMATION >[EPS]
EPS CONTROL UNIT
DTC Inspection Priority Chart
INFOID:0000000005931257
When multiple DTCs are detected simultaneously, c heck one by one depending on the following priority list.
DTC IndexINFOID:0000000005931258
Priority Priority order item (DTC)
1 U1000 CAN COMM CIRCUIT
2 C1601 BATTERY POWER SUPPLY
3 Other than the above
DTC Items (CONSULT-III screen terms) Reference
C1601 BATTERY VOLT STC-9, "
DTC Logic"
C1604TORQUE SENSOR STC-11, "DTC Logic"
C1606EPS MOTOR STC-13, "DTC Logic"
C1607EEPROM STC-15, "DTC Logic"
C1608CONTROL UNIT STC-15, "DTC Logic"
C1609CAN VHCL SPEED STC-16, "DTC Logic"
C1610CAN ENG RPM STC-17, "DTC Logic"
U1000CAN COMM CIRCUIT STC-18, "DTC Logic"
Revision: May 2010 2011 Versa

TROUBLE DIAGNOSESWT-15
< SERVICE INFORMATION >
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How to Perform Trouble Diagnosis for Quick and Accurate RepairINFOID:0000000005931108
INTRODUCTION
• Before troubleshooting, verify customer complaints.
• If a vehicle malfunction is difficult to reproduce, harnesses, harness connectors or terminals may be mal- functioning. Hold and shake these parts to make sure they are securely connected.
• When using a circuit tester to measure voltage or re sistance of each circuit, be careful not to damage or
deform connector terminals.
WORK FLOW
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
SELF DIAGNOSTIC RESULT Displays BCM self-diagnosis results.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read. ECU IDENTIFICATION BCM part number can be read.
CONFIGURATION Performs BCM configuration read/write functions.
Diagnostic mode
Description
Preliminary check :WT-16Self-diagnosis :WT-16Trouble diagnosis for symptoms : WT-23
SEIA0100E
Revision: May 2010 2011 Versa