Nissan Leaf. Manual - part 1146

C1609 VEHICLE SPEED SIGNAL

STC-29

< DTC/CIRCUIT DIAGNOSIS >

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C1609 VEHICLE SPEED SIGNAL

DTC Logic

INFOID:0000000010119203

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn power switch OFF and

wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

DTC REPRODUCTION PROCEDURE

With CONSULT

1. Turn the power switch OFF to ON.

2. Perform “Self-Diagnostic Result” of “EPS” control unit.
Is DTC “C1609” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-29, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010119204

1.

PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS

 With CONSULT

1. Turn the power switch OFF to ON.

2. Perform “Self-Diagnostic Result” of  “ABS”. 
Is any DTC detected?

YES

>> Check the DTC. Refer to 

BRC-56, "DTC Index"

.

NO

>> GO TO 2.

2.

PERFORM SELF-DIAGNOSIS

With CONSULT

Perform “Self-diagnostic Result” of “EPS” control unit.
Is DTC “C1609” detected?

YES

>> EPS control unit is malfunctioning. Replace steering column assembly. Refer to 

ST-35, "Removal

and Installation"

.

NO

>> Check EPS control unit pin terminals for damage or loose connection with harness connector. If

any item are damaged, repair or replace malfunctioning parts.

DTC

Display item

Malfunction detected condition

Possible cause

C1609

CAN VHCL SPEED

• Malfunction is detected in vehicle speed signal that 

is output from ABS actuator and electric unit (con-
trol unit) via CAN communication.

• ABS actuator and electric unit (control unit) input 

signal error is detected.

• Harness or connector
• CAN communication line
• EPS control unit
• ABS malfunction 
- Vehicle speed signal error

STC-30

< DTC/CIRCUIT DIAGNOSIS >

U1000 CAN COMM CIRCUIT

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000010119205

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.

Each control unit communicate data but selectively reads required data only.

DTC Logic

INFOID:0000000010119206

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn power switch OFF and

wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

DTC REPRODUCTION PROCEDURE

 With CONSULT

1. Turn the power switch OFF to ON.

2. Perform “Self-Diagnostic Result” of “EPS” control unit.
Is DTC “U1000” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-30, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010119207

Proceed to 

LAN-17, "Trouble Diagnosis Flow Chart"

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DTC

Display item

Malfunction detected condition

Possible cause

U1000

CAN COMM CIRCUIT

EPS control unit is not transmitting/re-
ceiving CAN communication signal for 2 
seconds or more.

• CAN communication error
• EPS control unit

EPS WARNING LAMP

STC-31

< DTC/CIRCUIT DIAGNOSIS >

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EPS WARNING LAMP

Component Function Check

INFOID:0000000010119208

1.

CHECK THE ILLUMINATION OF THE EPS WARNING LAMP

Check that the EPS warning lamp turns ON when power switch turns ON. Then, EPS warning lamp turns OFF

after the vehicle is READY state.
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Perform trouble diagnosis. Refer to 

STC-31, "Diagnosis Procedure"

. 

Diagnosis Procedure

INFOID:0000000010119209

1.

PERFORM SELF-DIAGNOSIS

With CONSULT

1. Turn the power switch OFF to ON.

2. Perform ”Self-Diagnostic Result” of ”EPS” control unit.
Is any DTC detected?

YES

>> Check the DTC. Refer to 

STC-14, "DTC Index"

. 

NO

>> GO TO 2.

2.

CHECK EPS WARNING LAMP SIGNAL

With CONSULT

1. Select “Data Monitor” of “EPS” and select “WARNING LAMP”.

2. Check that the item in “Data Monitor” is “On”.

3. Set the vehicle to READY.

CAUTION:

Never drive the vehicle.

4. Check that the item in “Data Monitor” is “Off”.
Is the inspection result normal?

YES

>> Perform the trouble diagnosis for combination meter power supply circuit. Refer to 

MWI-85,

"COMBINATION METER : Diagnosis Procedure"

.

NO

>> EPS control unit is malfunctioning. Replace steering column assembly. Refer to 

ST-35, "Removal

and Installation"

.

STC-32

< SYMPTOM DIAGNOSIS >

EPS WARNING LAMP DOES NOT TURN ON

SYMPTOM DIAGNOSIS

EPS WARNING LAMP DOES NOT TURN ON

Description

INFOID:0000000010119210

EPS warning lamp does not turn ON when turning power switch ON from OFF. (Check the illumination of the

EPS warning lamp.)

Diagnosis Procedure

INFOID:0000000010119211

1.

CHECK EPS WARNING LAMP

Perform the trouble diagnosis of EPS warning lamp. Refer to 

STC-31, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Check that there is no malfunction in each harness connector pin terminal or disconnection.

NO

>> Repair or replace the specific malfunctioning part.