Nissan Leaf. Instruction — 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
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
.
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
.
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
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010119207
LAN-17, "Trouble Diagnosis Flow Chart"
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
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
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
"COMBINATION METER : Diagnosis Procedure"
.
NO
>> EPS control unit is malfunctioning. Replace steering column assembly. Refer to
.
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
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.
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