Nissan Cube. Manual - part 976

TM-160

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F08B]

P1778 STEP MOTOR

P1778 STEP MOTOR

Description

INFOID:0000000009949038

• Step motor changes step by turning 4 coils ON or OFF according to signal from TCM.
• By changing step, step motor controls outward flow and inward flow of line pressure to primary pulley, deter-

mines the primary pulley position, and controls gear ratio.

• This DTC is not caused by an electrical malfunction (circuit open or short) but is caused by a mechanical

malfunction (control valve clogging, solenoid valve sticking, and others).

DTC Logic

INFOID:0000000009949039

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

• Always drive vehicle at a safe speed.
• Before starting “DTC confirmation procedure”, check primary pulley speed and vehicle speed.
• It is fixed in high speed range. Go to 

TM-116, "Diagnosis Procedure"

.

1.

PRECONDITIONING

Immediately after performing any “DTC CONFIRMATION PROCEDURE”, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1.

Select “Data Monitor” in “TRANSMISSION”.

2.

Select “RANGE”, “ATF TEMP SEN”, “ACC PEDAL OPEN”, “PRI SPEED” and “VEHICLE SPEED”.

3.

Drive the vehicle.

4.

Maintain the following conditions for 5 seconds or more.

5.

Stop the vehicle.

6.

Select “Self Diagnostic Results” in “TRANSMISSION”.

With GST

Follow the procedure “With CONSULT”.

Is “P1778” detected?

YES

>> Go to 

TM-160, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009949040

1.

CHECK STEP MOTOR SYSTEM

Check step motor system. Refer to 

TM-157, "DTC Logic"

.

Is the inspection result normal?

YES

>> GO TO 2.

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P1778

Step Motor Circuit Intermittent

TCM detects that primary speed sensor value and primary 
pulley speed estimated from secondary speed sensor are 
in a deviated state, and target pulley ratio and actual pul-
ley ratio are in a deviated state

Step motor

RANGE

: D

ATF TEMP SEN

: 2.03 – 0.16 V

ACC PEDAL OPEN

: More than 1.0/8

PRI SPEED

: More than 1,000 rpm

VEHICLE SPEED

: More than 10 km/h (7 MPH)

P1778 STEP MOTOR

TM-161

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F08B]

C

E

F

G

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M

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B

TM

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NO

>> Repair or replace damaged parts.

2.

CHECK PRIMARY SPEED SENSOR SYSTEM

Check primary speed sensor system. Refer to 

TM-116, "DTC Logic"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

CHECK SECONDARY SPEED SENSOR SYSTEM

Check secondary speed sensor system. Refer to 

TM-119, "DTC Logic"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

 CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace transaxle assembly. Refer to 

TM-235, "Exploded View"

.

NO

>> Repair or replace damaged parts.

TM-162

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F08B]

OVERDRIVE CONTROL SWITCH

OVERDRIVE CONTROL SWITCH

Description

INFOID:0000000009949041

• The overdrive control switch is installed to the selector lever knob.
• When turning ON the overdrive control switch (OD OFF indicator lamp turns ON), the driving condition

becomes overdrive OFF.

• When turning OFF the overdrive control switch (OD OFF indicator lamp turns OFF), the driving condition

changes to “D” position.

Component Function Check

INFOID:0000000009949042

1.

CHECK OVERDRIVE CONTROL SWITCH SIGNAL

With CONSULT

1.

Turn ignition switch ON.

2.

Select “Data Monitor” in “TRANSMISSION”.

3.

Select “SPORT MODE SW”.

4.

Check display of “SPORT MODE SW”.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

TM-162, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009949043

1.

 CHECK OVERDRIVE CONTROL SWITCH POWER CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect CVT shift selector connector.

3.

Turn ignition switch ON.

4.

Check voltage between CVT shift selector vehicle side harness connector terminals.

With intelligent key system

Without intelligent key system

Is the inspection result normal?

YES 

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK OVERDRIVE CONTROL SWITCH

Check overdrive control switch. Refer to 

TM-164, "Component Inspection (Overdrive Control Switch)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

NO

>> Repair or replace damaged parts.

3.

 CHECK GROUND CIRCUIT

Monitor item

Condition

Status

SPORT MODE SW

Press and hold overdrive control switch

On

Other conditions

Off

CVT shift selector vehicle side harness connector

Condition

Voltage (Approx.)

Connector

Terminal

M58

1

2

Ignition switch: ON

5 V

Ignition switch: OFF

0 V

CVT shift selector vehicle side harness connector

Condition

Voltage (Approx.)

Connector

Terminal

M57

1

2

Ignition switch: ON

5 V

Ignition switch: OFF

0 V

OVERDRIVE CONTROL SWITCH

TM-163

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F08B]

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1.

Turn ignition switch OFF.

2.

Check continuity between CVT shift selector vehicle side harness connector terminal and ground.

With intelligent key system

Without intelligent key system

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

 CHECK HARNESS BETWEEN CVT SHIFT SELECTOR (OVERDRIVE CONTROL SWITCH) AND COM-

BINATION METER (PART 1)

1.

Disconnect combination meter connector.

2.

Check continuity between CVT shift selector vehicle side harness connector terminal and combination
meter vehicle side harness connector terminal.

With intelligent key system

Without intelligent key system

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace damaged parts.

5.

CHECK HARNESS BETWEEN CVT SHIFT SELECTOR (OVERDRIVE CONTROL SWITCH) AND COMBI-

NATION METER (PART 2)

Check continuity between CVT shift selector vehicle side harness connector terminal and ground.

With intelligent key system

Without intelligent key system

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace damaged parts.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Check input and output signals of combination meter. Refer to 

MWI-48, "Reference Value"

.

NO

>> Repair or replace damaged parts.

CVT shift selector vehicle side harness connector

Ground

Continuity

Connector

Terminal

M58

2

Existed

CVT shift selector vehicle side harness connector

Ground

Continuity

Connector

Terminal

M57

2

Existed

CVT shift selector vehicle side harness connector

Combination meter vehicle side harness connector

Continuity

Connector

Terminal

Connector

Terminal

M58

1

M34

8

Existed

CVT shift selector vehicle side harness connector

Combination meter vehicle side harness connector

Continuity

Connector

Terminal

Connector

Terminal

M57

1

M34

8

Existed

CVT shift selector vehicle side harness connector

Ground

Continuity

Connector

Terminal

M58

1

Not existed

CVT shift selector vehicle side harness connector

Ground

Continuity

Connector

Terminal

M57

1

Not existed