Nissan Tiida C11. Manual - part 1221

DIAGNOSIS SYSTEM (EPS CONTROL UNIT)

STC-7

< FUNCTION DIAGNOSIS >

[EPS]

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DIAGNOSIS SYSTEM (EPS CONTROL UNIT)

CONSULT-III Function (EPS)

INFOID:0000000001697722

FUNCTION

CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.

SELF-DIAG RESULTS MODE

Display Item List

CAUTION:

If “CAN COMM CIRCUIT [U1000]” is displayed with other DTCs, first perform the trouble diagnosis for CAN communication
line.

How to Erase Self-Diagnostic Results

1.

Perform applicable inspection of malfunctioning item and then repair or replace.

2.

Turn ignition switch “OFF” to erase memory.

3.

Turn ignition switch “ON” and select “SELF-DIAG RESULTS” mode with CONSULT-III.

4.

Touch “ERASE” on CONSULT-III screen to erase DTC memory.

CAUTION:

If memory cannot be erased, perform diagnosis.

DATA MONITOR

Display Item List

EPS diagnostic mode

Description

SELF-DIAG RESULTS

• Displays EPS self-diagnosis results.

DATA MONITOR

• Displays EPS input/output data in real time.

CAN DIAG SUPPORT MNTR

• The result of transmit/receive diagnosis of CAN communication can be read.

ECU PART NUMBER

• EPS control unit part number can be read.

Item

(CONSULT-III screen terms)

Diagnostic item is detected when....

Check item

BATTERY VOLT
[C1601]

When the power supply malfunction supplied to EPS control unit is 
detected.

STC-9

TORQUE SENSOR
[C1604]

When the torque sensor malfunction assembled in steering column 
assembly is detected. 

STC-11

EPS MOTOR
[C1606]

When the motor driver malfunction of EPS control unit or EPS motor 
malfunction is detected.

STC-13

EEPROM
[C1607]

When the memory (EEPROM) system malfunction is detected in 
EPS control unit.

STC-15

CONTROL UNIT
[C1608]

When the internal malfunction is detected in EPS control unit.

STC-16

CAN VHCL SPEED
[C1609]

When the malfunction is detected in vehicle speed signal received 
with CAN communication.

STC-17

CAN ENG RPM
[C1610]

When the malfunction is detected in engine status signal received 
with CAN communication.

STC-19

CAN COMM CIRCUIT
[U1000]

When EPS control unit is not transmitting or receiving CAN commu-
nication signal 2 seconds or more.

STC-21

NO DTC IS DETECTED.
FURTHER TESTING MAY BE RE-
QUIRED.

No NG item has been detected.

—

STC-8

< FUNCTION DIAGNOSIS >

[EPS]

DIAGNOSIS SYSTEM (EPS CONTROL UNIT)

EPS CONTROL UNIT PART NUMBER

Display a part number of EPS control unit carried by a vehicle.

Monitor item (Unit)

Remarks

MOTOR VOL (V)

Power supply voltage for EPS control unit is displayed

TORQUE SENSOR (Nm)

Steering wheel turning force detected by torque sensor is displayed

MOTOR SIG (A)

Current commanded value to EPS motor is displayed

MOTOR CURRENT (A)

Current value consumed by EPS motor is displayed

VEHICLE SPEED (km/h) or (mph)

Vehicle speed is displayed from vehicle speed signal with CAN communication

WARNING LAMP (ON/OFF)

EPS warning lamp control status is displayed

DERATING STAT (ON/OFF)

Protect overload status is displayed

ENGINE STATUS (STOP/RUN)

Engine speed is displayed from engine status signal with CAN communication

C1601 BATTERY POWER SUPPLY

STC-9

< COMPONENT DIAGNOSIS >

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COMPONENT DIAGNOSIS

C1601 BATTERY POWER SUPPLY

Description

INFOID:0000000001716732

Power is supplied from the battery to EPS control unit.

DTC Logic

INFOID:0000000001716733

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAGNOSIS RESULTS

Check the self-diagnosis results.

Is above displayed on the self-diagnosis display?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-9, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001697724

1.

CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect EPS control unit harness connector.

3.

Turn ignition switch ON. (Do not start engine.)

4.

Check voltage between EPS control unit harness connector
M53 (A) terminal 10 and M54 (B) terminal 17 and ground.

5.

Turn ignition switch “OFF”.

6.

Check voltage between EPS control unit harness connector
M53 (A) terminal 10 and M54 (B) terminal 17 and ground.

7.

Connect EPS control unit harness connector.

OK or NG

OK

>> GO TO 2.

DTC

Display item

Malfunction detected condition

Possible cause

C1601

BATTERY VOLT

When the power supply malfunction supplied to EPS 
control unit is detected.

• Harness or connector
• EPS control unit

Self-diagnosis results

BATTERY VOLT

Connector

Terminal

Voltage

(A) M53

10 – Ground

Battery voltage

(B) M54

17 – Ground

Battery voltage

AWGIA0031ZZ

Connector

Terminal

Voltage

(A) M53

10 – Ground

Approx. 0 V

(B) M54

17 – Ground

Battery voltage

AWGIA0028ZZ

STC-10

< COMPONENT DIAGNOSIS >

[EPS]

C1601 BATTERY POWER SUPPLY

NG

>>

Check the following. If any items are damaged, repair or replace damaged parts.

• 60 A fusible link (letter m, located in the fuse and fusible link box).
• 10 A fuse [No. 2, located in the fuse block (J/B)].
• Harness for short or open between battery and EPS control unit harness connector M54 termi-

nal 17.

• Harness for short or open between ignition switch and EPS control unit harness connector M53

terminal 10.

2.

CHECK EPS CONTROL UNIT GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect EPS control unit harness connector.

3.

Check continuity between EPS control unit harness connector
M54 terminal 18 and ground.

Also check harness for short to power.

4.

Connect EPS control unit harness connector.

OK or NG

OK

>> GO TO 3.

NG

>> Repair open circuit, short to ground or short to power in

harness or connectors.

3.

CHECK DTC

1.

Start engine.

Does EPS warning lamp turn OFF?

YES

>> INSPECTION END

NO

>> Perform self-diagnosis, repair or replace damaged parts. Refer to 

STC-7, "CONSULT-III Function

(EPS)"

.

Special Repair Requirement (Models with ESP)

INFOID:0000000001716734

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform the neutral position adjustment for the steering angle sensor, when replacing the EPS control
unit. Refer to 

BRC-90, "ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : Descrip-

tion"

.

>> END

Connector

Terminal

Continuity

M54

18

Yes

AWGIA0029ZZ