Nissan Murano Z51. Manual - part 1437

P1778 STEP MOTOR

TM-99

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

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P1778 STEP MOTOR

Description

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• The step motor changes the step by 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.

• This diagnosis item is detected when the electrical system is OK, but the mechanical system is NG.
• This diagnosis item is detected when the state of the changing of the speed mechanism in the unit does not

operate normally.

DTC Logic

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DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

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” in “Data Monitor”.

• If hi-geared fixation occurred, go to 

TM-99, "Diagnosis Procedure"

.

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

1.

CHECK DTC DETECTION

With CONSULT-III

1.

Turn ignition switch ON.

2.

Select “Data Monitor” in “TRANSMISSION”.

3.

Make sure that output voltage of CVT fluid temperature sensor is within the range below.

4.

Start engine and maintain the following conditions for at least 30 consecutive seconds.

With GST

Follow the procedure “With CONSULT-III”.

Is “P1778” detected?

YES

>> Go to 

TM-99, "Diagnosis Procedure"

.

NO

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

Diagnosis Procedure

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1.

CHECK STEP MOTOR SYSTEM

Check step motor system. Refer to 

TM-96, "DTC Logic"

.

Is the inspection result normal?

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P1778

Step Motor Circuit Intermit-
tent

There is a big difference between the num-
ber of steps for the stepping motor and for 
the actual gear ratio.

Step motor

ATF TEMP SEN

: 1.0 – 2.0 V

If it is 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)

Start test from 0 km/h (0 MPH)

Constant acceleration

: Keep 30 seconds 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

TM-100

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

P1778 STEP MOTOR

YES

>> GO TO 2.

NO

>> Repair or replace damaged parts.

2.

CHECK PRIMARY SPEED SENSOR SYSTEM

Check primary speed sensor system. Refer to 

TM-52, "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-55, "DTC Logic"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

DETECT MALFUNCTIONING ITEMS

Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?

YES

>> Replace TCM. Refer to 

TM-160, "Exploded View"

.

NO

>> Repair or replace damaged parts.

SHIFT POSITION INDICATOR CIRCUIT

TM-101

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

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SHIFT POSITION INDICATOR CIRCUIT

Description

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• TCM sends position indicator signals to combination meter via CAN communication line.
• The selector lever position is indicated on the shift position indicator.

Component Function Check

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1.

CHECK SHIFT POSITION INDICATOR

CAUTION:

Always drive vehicle at a safe speed.
1.

Start engine.

2.

Check that correct selector lever position (“P”, “R”, “N”, “D”, “L”) is displayed as selector lever is moved
into each position.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

TM-101, "Diagnosis Procedure"

.

Diagnosis Procedure

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1.

CHECK INPUT SIGNALS

With CONSULT-III

1.

Start engine.

2.

Select “RANGE” in “Data Monitor” and read out the value.

3.

Check that correct selector lever position (“P”, “R”, “N”, “D”, “L”) is displayed as selector lever is moved
into each position.

Is the inspection result normal?

YES

>> INSPECTION END

NO-1 (CVT position indicator does not indicate “L” when selector lever is moved into “L”.)>>Check  the  fol-

lowing.

• Check overdrive control switch. Refer to 

TM-109, "Description"

.

• Check CVT main system (Fail-safe function actuated).
- Perform “Self Diagnostic Results” in “TRANSMISSION”.

NO-2 (The actual gear position changes, but the shift position indicator is not indicated.)>>Perform 

“Self

Diagnostic Results” in “TRANSMISSION”.

NO-3 (The actual gear position and the indication on the shift position indicator do not coincide.)>>Perform

“Self Diagnostic Results” in “TRANSMISSION”.

NO-4 (Only a specific position or positions is/are not indicated on the shift position indicator.)>>Check 

the

combination meter. Refer to 

MWI-34, "CONSULT-III Function (METER/M&A)"

.

TM-102

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

SHIFT LOCK SYSTEM

SHIFT LOCK SYSTEM

Description

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Component

Function

Shift lock solenoid

It operates according to the signal from the stop lamp switch and 
moves the lock lever. 

Lock lever

It moves according to the operation of the shift lock solenoid and 
performs the release of the shift lock. 

Detent rod

It links with the selector button and restricts the selector lever 
movement. 

Park position switch

It detects that the selector lever is in “P” position. 

Shift lock release button

It moves the lock lever forcibly.