Nissan Murano Z50 (2007 year). Manual - part 56

 

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Nissan Murano Z50 (2007 year). Manual - part 56

 

 

DTC P1722 ESTM VEHICLE SPEED SIGNAL

CVT-157

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Diagnostic Procedure

NCS0017K

1. 

CHECK CAN COMMUNICATION LINE

Perform the self-diagnosis check. Refer to 

CVT-61, "SELF-DIAGNOSTIC RESULT MODE"

 .

Is any malfunction of the “U1000 CAN COMM CIRCUIT” indicated?

YES

>> Check CAN communication line. Refer to 

CVT-68, "DTC U1000 CAN COMMUNICATION LINE"

 .

NO

>> GO TO 2.

2. 

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Perform ABS actuator and electric unit (control unit) self-diagnosis check. Refer to 

BRC-20, "DESCRIPTION"

(ABS models) or 

BRC-65, "DESCRIPTION"

  (VDC/TCS/ABS models).

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3. 

CHECK INPUT SIGNALS

 With CONSULT-II

1.

Start engine.

2.

Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “TRANSMISSION” with CONSULT-II.

3.

Drive vehicle and read out the value of “VEHICLE SPEED” and
“ESTM VSP SIG”.

4.

Check if there is a great difference between the two values.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

CHECK TCM

Check TCM input/output signals. Refer to 

CVT-53, "TCM Input/Output Signal Reference Values"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace damaged parts.

5. 

CHECK DTC

Perform 

CVT-156, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

Item name

Condition

Display value

ESTM VSP SIG

During driving

Approximately matches 
the speedometer reading.

VEHICLE SPEED

SCIA4510E

CVT-158

DTC P1723 CVT SPEED SENSOR FUNCTION

Revision: 2006 July

2007 Murano

DTC P1723 CVT SPEED SENSOR FUNCTION

PFP:31907

Description

NCS0017L

The vehicle speed sensor CVT [output speed sensor (secondary speed sensor)] detects the revolution of
parking gear and generates a pulse signal. The pulse signal is sent to the TCM, which converts it into vehicle
speed.
The input speed sensor (primary speed sensor) detects the primary pulley revolution speed and sends a sig-
nal to the TCM.

On Board Diagnosis Logic

NCS0017M

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code “P1723 CVT SPD SEN/FNCTN” with CONSULT-II is detected when there is a
great difference between the vehicle speed signal and the secondary speed sensor signal.

CAUTION:

One of the “P0720 VEH SPD SEN/CIR AT”, the “P0715 INPUT SPD SEN/CIRC” or the “P0725 ENGINE
SPEED SIG“ is displayed with the DTC at the same time.

Possible Cause

NCS0017N

Harness or connectors
(Sensor circuit is open or shorted.)

Output speed sensor (Secondary speed sensor)

Input speed sensor (Primary speed sensor)

Engine speed signal system

DTC Confirmation Procedure

NCS0017O

CAUTION:

Always drive vehicle at a safe speed.

NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.

 WITH CONSULT-II

1.

Turn ignition switch ON and select “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.

2.

Start engine and maintain the following conditions for at least 5
consecutive seconds.
VEHICLE SPEED SE: 10 km/h (6 MPH) or more
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
ENG SPEED: 450 rpm or more
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.

3.

If DTC is detected, go to 

CVT-159, "Diagnostic Procedure"

 .

BCIA0031E

DTC P1723 CVT SPEED SENSOR FUNCTION

CVT-159

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Revision: 2006 July

2007 Murano

Diagnostic Procedure

NCS0017P

1. 

CHECK STEP MOTOR FUNCTION

Perform the self-diagnosis check. Refer to 

CVT-61, "SELF-DIAGNOSTIC RESULT MODE"

 .

Is a malfunction in the step motor function indicated in the results?

YES

>> Repair or replace damaged parts. (Check the step motor function. Refer to 

CVT-172, "DTC P1778

STEP MOTOR - FUNCTION"

 .)

NO

>> GO TO 2.

2. 

CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR SYSTEM) AND INPUT SPEED 

SENSOR (PRIMARY SPEED SENSOR) SYSTEM

Check output speed sensor (secondary speed sensor) system and input speed sensor (primary speed sensor)
system. Refer to 

CVT-94, "DTC P0720 VEHICLE SPEED SENSOR CVT (SECONDARY SPEED SENSOR)"

 ,

CVT-89, "DTC P0715 INPUT SPEED SENSOR CIRCUIT (PRI SPEED SENSOR)"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3. 

CHECK ENGINE SPEED SIGNAL SYSTEM

Check engine speed signal system. Refer to 

CVT-100, "DTC P0725 ENGINE SPEED SIGNAL"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts. Refer to 

EC-635, "IGNITION SIGNAL"

 .

4. 

DETECT MALFUNCTIONING ITEM

Check the following.

Power supply and ground circuit for TCM. Refer to 

CVT-149, "DTC P1701 TRANSMISSION CONTROL

MODULE (POWER SUPPLY)"

 .

The TCM pin terminals for damage or loose connection with harness connector.

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace damaged parts.

5. 

CHECK DTC

Perform 

CVT-158, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> Replace TCM or transaxle assembly. Refer to 

CVT-9, "Precautions for TCM and CVT Assembly

Replacement"

 , 

CVT-215, "Removal and Installation"

 .

CVT-160

DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM

Revision: 2006 July

2007 Murano

DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM

PFP:23710

Description

NCS0017Q

Electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle
position sensor etc. The actuator sends a signal to the ECM, and ECM sends the signal to TCM with CAN
communication.

On Board Diagnosis Logic

NCS0017R

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code “P1726 ELEC TH CONTROL” with CONSULT-II is detected when the electroni-
cally controlled throttle for ECM is malfunctioning.

Possible Cause

NCS0017S

Harness or connectors
(Sensor circuit is open or shorted.)

DTC Confirmation Procedure

NCS0017T

NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode for “TRANSMISSION” with
CONSULT-II.

3.

Start engine and let it idle for 5 seconds.

4.

If DTC is detected, go to 

CVT-161, "Diagnostic Procedure"

 .

BCIA0031E

DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM

CVT-161

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Revision: 2006 July

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Diagnostic Procedure

NCS0017U

1. 

CHECK DTC WITH ECM 

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “SELF-DIAG RESULTS” mode for “ENGINE” with CON-
SULT-II. Refer to 

EC-114, "SELF-DIAG RESULTS MODE"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Check the DTC Detected Item. Refer to 

EC-114, "SELF-

DIAG RESULTS MODE"

 .

If CAN communication line is detected, go to 

CVT-68,

"DTC U1000 CAN COMMUNICATION LINE"

 .

2. 

CHECK DTC

Perform 

CVT-160, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING ITEM

Check The TCM pin terminals for damage or loose connection with harness connector.

OK or NG

OK

>> Replace TCM. Refer to 

CVT-9, "Precautions for TCM and CVT Assembly Replacement"

 .

NG

>> Repair or replace damaged parts.

BCIA0030E

CVT-162

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

Revision: 2006 July

2007 Murano

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

PFP:31941

Description

NCS0017V

Lock-up select solenoid valve controls lock-up clutch pressure or forward clutch pressure (reverse brake
pressure).

When controlling lock-up clutch, the valve is turned OFF. When controlling forward clutch, it is turned ON.

CONSULT-II Reference Value

NCS0017W

*: Without manual mode.

On Board Diagnosis Logic

NCS0017X

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P1740 LU-SLCT SOL/CIRC” with CONSULT-II is detected under the following
conditions.

When TCM compares target value with monitor value and detects an irregularity.

Possible Cause

NCS0017Y

Lock-up select solenoid valve

Harness or connectors
(Solenoid circuit is open or shorted.)

DTC Confirmation Procedure

NCS0017Z

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode for “TRANSMISSION” with
CONSULT-II.

3.

Start engine and maintain the following conditions for at least 5
consecutive seconds.
RANGE: “D” position and “N” positions 
(At each time, wait for 5 seconds.)

4.

If DTC is detected, go to 

CVT-164, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition 

Display value

LUSEL SOL OUT

Selector lever in “P” and “N” positions 

ON

Wait at least for 5 seconds with the selector 
lever in “R”, “D”, “S”* and “L”* positions.

OFF

BCIA0031E

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

CVT-163

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Wiring Diagram — CVT — L/USSV

NCS00180

TCWA0252E

CVT-164

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

Revision: 2006 July

2007 Murano

TCM terminal data are reference values, measured between each terminal and ground.

*: Without manual mode

Diagnostic Procedure

NCS00181

1. 

 CHECK INPUT SIGNAL

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “TRANSMISSION” with CONSULT-II.

3.

Read out the value of “LUSEL SOL OUT”.

*: Without manual mode

 Without CONSULT-II

1.

Turn ignition switch ON.

2.

Check voltage between TCM connector terminal and ground.

*: Without manual mode

3.

Turn ignition switch OFF.

4.

Disconnect the TCM connector.

5.

Check if there is continuity between connector terminal and ground.

OK or NG

OK >> GO 

TO 

5.

NG

>> GO TO 2.

Terminal

Wire color

Item

Condition

Data (Approx.)

4

L/Y

Lock-up select 
solenoid valve

Selector lever in “P” and “N” positions 

Battery voltage

Wait at least for 5 seconds with the selector 
lever in “R”, “D”, “S”* and “L”* positions.

0 V

Item name

Condition

Display value

LUSEL SOL OUT

Selector lever in “P” and “N” positions 

ON

Wait at least for 5 seconds with the selec-
tor lever in “R”, “D”, “S”* and “L”* positions.

OFF

Name

Connector

Terminal

Condition

Voltage 

(Approx.)

Lock-up 
select 
solenoid 
valve

F103

4 – Ground

Selector lever in “P” and “N” 
positions 

Battery 
voltage

Wait at least for 5 seconds 
with the selector lever in 
“R”, “D”, “S”* and “L”* posi-
tions.

0 V

SCIA4512E

SCIA4513E

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

CVT-165

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2. 

CHECK LOCK-UP SELECT SOLENOID VALVE CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect TCM connector.

3.

Check resistance between TCM connector terminal and ground.

OK or NG

OK >> GO 

TO 

5.

NG

>> GO TO 3.

3. 

CHECK VALVE RESISTANCE

1.

Turn ignition switch OFF.

2.

Disconnect CVT unit harness connector.

3.

Check resistance between CVT unit harness connector terminal
and ground.

OK or NG

OK >> GO 

TO 

4.

NG

>> Replace the transaxle assembly. Refer to 

CVT-215,

"Removal and Installation"

 .

4. 

CHECK HARNESS BETWEEN TCM AND LOCK-UP SELECT SOLENOID VALVE

1.

Turn ignition switch OFF.

2.

Disconnect TCM connector.

3.

Check continuity between TCM connector terminal and CVT unit
harness connector terminal.

4.

If OK, check harness for short to ground and short to power.

5.

Reinstall any part removed.

OK or NG

OK

>> GO TO 5.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

5. 

CHECK DTC

Perform 

CVT-162, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 6.

Solenoid valve

Connector

Terminal

Resistance 

(Approx.)

Lock-up select solenoid valve

F103

4 – Ground

6 – 19 

SCIA4692E

Solenoid valve

Connector

Terminal

Resistance 

(Approx.)

Lock-up select solenoid valve

F6

13 – Ground

6 – 19 

SCIA4693E

Item

Connector

Terminal

Continuity

TCM connector

F103

Yes

CVT unit harness connector

F6

13

SCIA4694E

CVT-166

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

Revision: 2006 July

2007 Murano

6. 

CHECK TCM

1.

Check TCM input/output signals. Refer to 

CVT-53, "TCM Input/Output Signal Reference Values"

 . 

2.

If NG, re-check TCM pin terminals for damage or loose connection with harness connector.

OK or NG

OK

>> INSPECTION END 

NG

>> 1. Repair or replace damaged parts.

2. Replace TCM. Refer to 

CVT-9, "Precautions for TCM and CVT Assembly Replacement"

 .

Component Inspection

NCS00182

LOCK-UP SELECT SOLENOID VALVE

1.

Turn ignition switch OFF.

2.

Disconnect CVT unit harness connector.

3.

Check resistance between CVT unit harness connector terminal
and ground.

4.

If NG, replace the transaxle assembly. Refer to 

CVT-215,

"Removal and Installation"

 .

Solenoid valve

Connector

Terminal

Resistance 

(Approx.)

Lock-up select solenoid valve

F6

13 – Ground

6 – 19 

SCIA4693E

DTC P1745 LINE PRESSURE CONTROL

CVT-167

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DTC P1745 LINE PRESSURE CONTROL

PFP:31036

Description

NCS00183

The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge pres-
sure to suit the driving condition in response to a signal sent from the TCM.

On Board Diagnosis Logic

NCS00184

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code “P1745 L/PRESS CONTROL” with CONSULT-II is detected when TCM detects
the unexpected line pressure.

Possible Cause

NCS00185

TCM

DTC Confirmation Procedure

NCS00186

NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.

 WITH CONSULT-II

1.

Turn ignition switch ON and select “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.

2.

Make sure that output voltage of CVT fluid temperature sensor
is within the range below.
ATF TEMP SEN: 1.0 – 2.0 V
If out of range, drive the vehicle to decrease the voltage
(warm up the fluid) or stop engine to increase the voltage
(cool down the fluid)

3.

If DTC is detected, go to 

CVT-167, "Diagnostic Procedure"

 .

Diagnostic Procedure

NCS00187

1. 

CHECK DTC 

1.

Turn ignition switch ON.

2.

Select “SELF-DIAG RESULTS” mode for “TRANSMISSION” with CONSULT-II.

3.

Erase self-diagnostic results. Refer to 

CVT-63, "How to Erase Self-diagnostic Results"

 .

4.

Turn ignition switch OFF, and wait for 10 seconds or more.

5.

Start engine.

6.

Confirm self-diagnostic results again. Refer to 

CVT-61, "SELF-DIAGNOSTIC RESULT MODE"

 .

Is the “P1745 L/PRESS CONTROL” displayed?

YES

>> Replace TCM. Refer to 

CVT-9, "Precautions for TCM and CVT Assembly Replacement"

 .

NO

>> INSPECTION END

BCIA0031E

CVT-168

DTC P1777 STEP MOTOR - CIRCUIT

Revision: 2006 July

2007 Murano

DTC P1777 STEP MOTOR - CIRCUIT

PFP:31020

Description

NCS00188

The step motor changes the step with turning 4 coils ON/OFF according to the signal from TCM. As a result,
the flow of line pressure to primary pulley is changed and pulley ratio is controlled

CONSULT-II Reference Value

NCS00189

Remarks: Specification data are reference values.

On Board Diagnosis Logic

NCS0018A

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P1777 STEP MOTR CIRC” with CONSULT-II is detected under the following
conditions.

When operating step motor ON and OFF, there is no proper change in the voltage of TCM terminal which
corresponds to it.

Possible Cause

NCS0018B

Step motor

Harness or connectors
(Step motor circuit is open or shorted.)

DTC Confirmation Procedure

NCS0018C

CAUTION:

Always drive vehicle at a safe speed.

NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.

 WITH CONSULT-II

1.

Turn ignition switch ON and select “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.

2.

Drive vehicle for at least 5 consecutive seconds.

3.

If DTC is detected, go to 

CVT-170, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition

Display value (Approx.)

STM STEP

During driving

20 step – 190 step

SMCOIL A

Changes ON

OFF.

SMCOIL B

SMCOIL C

SMCOIL D

BCIA0031E

DTC P1777 STEP MOTOR - CIRCUIT

CVT-169

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Revision: 2006 July

2007 Murano

Wiring Diagram — CVT — STM

NCS0018D

TCWA0256E

CVT-170

DTC P1777 STEP MOTOR - CIRCUIT

Revision: 2006 July

2007 Murano

TCM terminals data are reference values, measured between each terminal and ground.

*: A circuit tester cannot be used to test this item.

Diagnostic Procedure

NCS0018E

1. 

CHECK INPUT SIGNALS

 With CONSULT-II

1.

Start engine.

2.

Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “TRANSMISSION” with CONSULT-II.

3.

Start vehicle and read out the value of “STM STEP”, “SMCOIL
A”, “SMCOIL B”, “SMCOIL C”, and “SMCOIL D”.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 2.

2. 

CHECK HARNESS BETWEEN TCM AND STEP MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect CVT unit connector and TCM connector.

3.

Check continuity between TCM connector terminals and CVT
unit harness connector terminals.

4.

If OK, check harness for short to ground and short to power.

5.

If OK, check continuity between body ground and CVT assembly.

6.

Reinstall any part removed.

OK or NG

OK

>> GO TO 3.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

Terminal

Wire color

Item

Condition

Data (Approx.)

11

G/R

Step motor A

Within 2 seconds after ignition switch ON, the time measure-
ment by using the pulse width measurement function (Hi level) 
of CONSULT-II*

CAUTION:

Connect the diagnosis data link cable to the vehicle diag-
nosis connector.

30.0 msec

12

O/B

Step motor B

10.0 msec

20

R

Step motor C

30.0 msec

21

R/G

Step motor D

10.0 msec

Item name

Condition

Display value (Approx.)

STM STEP

During driving

20 step – 190 step

SMCOIL A

Changes ON

OFF.

SMCOIL B

SMCOIL C

SMCOIL D

SCIA4516E

Item

Connector

Terminal

Continuity

TCM connector

F103

11

Yes

CVT unit harness connector

F6

6

TCM connector

F103

12

Yes

CVT unit harness connector

F6

7

TCM connector

F103

20

Yes

CVT unit harness connector

F6

8

TCM connector

F103

21

Yes

CVT unit harness connector

F6

9

SCIA4695E

DTC P1777 STEP MOTOR - CIRCUIT

CVT-171

D

E

F

G

H

I

J

K

L

M

A

B

CVT

Revision: 2006 July

2007 Murano

3. 

CHECK STEP MOTOR 

Check step motor. Refer to 

CVT-171, "Component Inspection"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4. 

CHECK DTC

Perform 

CVT-168, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 5.

5. 

CHECK TCM

1.

Check TCM input/output signals. Refer to 

CVT-53, "TCM Input/Output Signal Reference Values"

 .

2.

If NG, re-check TCM pin terminals for damage or loose connection with harness connector.

OK or NG

OK

>> INSPECTION END

NG

>> Repair or replace damaged parts.

Component Inspection

NCS0018F

STEP MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect CVT unit harness connector.

3.

Check resistance between CVT unit harness connector termi-
nals and ground.

4.

If NG, replace the transaxle assembly. Refer to 

CVT-215, "Removal and Installation"

 .

Name

Connector

Terminal

Resistance 

(Approx.)

Step motor

F6

6 – 7

 30 

8 – 9

6 – Ground

 15 

7 – Ground

8 – Ground

9 – Ground

SCIA4696E

CVT-172

DTC P1778 STEP MOTOR - FUNCTION

Revision: 2006 July

2007 Murano

DTC P1778 STEP MOTOR - FUNCTION

PFP:31947

Description

NCS0018G

The step motor's 4 aspects of ON/OFF change according to the signal from TCM. As a result, the flow of
line pressure to primary pulley is changed and pulley ratio is controlled.

This diagnosis item is detected when electrical system is OK, but mechanical system is NG.

This diagnosis item is detected when the state of the changing the speed mechanism in unit does not
operate normally.

CONSULT-II Reference Value

NCS0018H

Remarks: Specification data are reference values.

On Board Diagnosis Logic

NCS0018I

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P1778 STEP MOTR/FNC” with CONSULT-II is detected under the following con-
ditions.

When not changing the pulley ratio according to the instruction of TCM.

Possible Cause

NCS0018J

Step motor

DTC Confirmation Procedure

NCS0018K

CAUTION:

Always drive vehicle at a safe speed.

Before starting “DTC Confirmation Procedure”, confirm “Hi” or “Mid” or “Low” fixation by “PRI
SPEED” and “VEHICLE SPEED” on “DATA MONITOR MODE”.

If hi-geared fixation occurred, go to 

CVT-173, "Diagnostic Procedure"

 .

NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.

 WITH CONSULT-II

1.

Turn ignition switch ON and select “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.

2.

Make sure that output voltage of CVT fluid temperature sensor
is within the range below.
ATF TEMP SEN: 1.0 – 2.0 V
If out of range, drive the vehicle to decrease the voltage
(warm up the fluid) or stop engine to increase the voltage
(cool down the fluid)

3.

Select “DATA MONITOR” mode for “TRANSMISSION” with
CONSULT-II.

4.

Start engine and maintain the following conditions for at least 30
consecutive seconds.
TEST START FROM 0 km/h (0 MPH)
CONSTANT ACCELERATION: Keep 30 sec or more
VEHICLE SPEED: 10 km/h (6 MPH) or more
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
ENG SPEED: 450 rpm or more

5.

If DTC is detected, go to 

CVT-173, "Diagnostic Procedure"

 .

Item name

Condition 

Display value (Approx.)

STM STEP

During driving

20 step – 190 step

GEAR RATIO

2.37 – 0.43

BCIA0031E

 

 

 

 

 

 

 

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