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Nissan Altima L32. Manual - part 1505

TM-364

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

P1778 STEP MOTOR - FUNCTION

P1778 STEP MOTOR - FUNCTION

Description

INFOID:0000000004201964

• 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 oper-

ate normally.

DTC Logic

INFOID:0000000004201965

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” on “DATA MONITOR MODE”.

• If hi-geared fixation occurred, go to

TM-364, "Diagnosis Procedure"

NOTE:

If “DTC CONFIRMATION PROCEDURE” has been previously performed, always turn ignition switch OFF.

Then wait at least 10 seconds before performing the next test.

CHECK DTC DETECTION

With CONSULT-III

1. Turn ignition switch ON.

2. Select “DATA MONITOR”.

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 STEP MOTR/FNC” detected?

YES

>> Go to

TM-364, "Diagnosis Procedure"

>> Check intermittent incident. Refer to

GI-42, "Intermittent Incident"

Diagnosis Procedure

INFOID:0000000004201966

CHECK STEP MOTOR SYSTEM

Check step motor system. Refer to

TM-361, "Description"

Is the inspection result normal?

DTC

Item

(CONSULT-III screen term)

Malfunction is detected when...

Possible cause

P1778

STEP MOTR/FNC

There is a great difference between the
number of steps for the stepping motor and
for the actual gear ratio.

Step motor

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)

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

P1778 STEP MOTOR - FUNCTION

TM-365

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

YES

>> GO TO 2.

>> Repair or replace damaged parts.

CHECK INPUT SPEED SENSOR (PRIMARY SPEED SENSOR) SYSTEM

Check input speed sensor (primary speed sensor) system. Refer to

TM-313, "Description"

Is the inspection result normal?

YES

>> GO TO 3.

>> Repair or replace damaged parts.

CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) SYSTEM

Check output speed sensor (secondary speed sensor) system. Refer to

TM-318, "Description"

Is the inspection result normal?

YES

>> GO TO 4.

>> Repair or replace damaged parts.

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-430, "Exploded View"

>> Repair or replace damaged parts.

TM-366

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

SHIFT POSITION INDICATOR CIRCUIT

SHIFT POSITION INDICATOR CIRCUIT

Description

INFOID:0000000004201967

• TCM sends position indicator signals to combination meter by CAN communication line.

• Manual mode switch position is indicated on shift position indicator.

Component Function Check

INFOID:0000000004201968

CHECK SHIFT POSITION INDICATOR

CAUTION:

Always drive vehicle at a safe speed.

1. Start engine.

2. Check if correct selector lever position (“P”, “N”, “R” or “D”) is displayed as selector lever is moved into

each position.

3. Drive vehicle in the manual mode, and confirm that the actual gear position and the meter's indication of

the position mutually coincide when selector lever is shifted to the “UP (+ side)” or “DOWN (

− side)” side

(1st

⇔ 6th gear).

Is the inspection result normal?

YES

>> INSPECTION END

>> Go to

TM-366, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000004201969

CHECK INPUT SIGNALS

With CONSULT-III

1. Start engine.

2. Check if correct selector lever position (“P”, “N”, “R” or “D”) is displayed as selector lever is moved into

each position.

3. Select “RANGE” on “DATA MONITOR” and read out the value.

4. Drive vehicle in the manual mode, and confirm that the actual gear position and the meter's indication of

the position mutually coincide when selector lever is shifted to the “UP (+ side)” or “DOWN (

− side)” side

(1st

⇔ 6th gear).

Is the inspection result normal?

YES

>> INSPECTION END

NO-1 >> The actual gear position does not change, or shifting into the manual mode is not possible (no

gear shifting in the manual mode possible). Or the shift position indicator is not indicated.

• Check manual mode switch. Refer to

TM-340, "Component Inspection (Manual Mode Switch)"

• Check CVT main system (Fail-safe function actuated).

- Perform “SELF-DIAG RESULTS” mode for “TRANSMISSION”.

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

• Perform “SELF-DIAG RESULTS” mode for “TRANSMISSION”.

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

• Perform “SELF-DIAG RESULTS” mode for “TRANSMISSION”.

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

• Check combination meter. Refer to

MWI-38, "CONSULT-III Function (METER/M&A)"

SHIFT LOCK SYSTEM

TM-367

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

SHIFT LOCK SYSTEM

Description

INFOID:0000000004201970

The selector lever cannot be shifted from “P” position to any other position unless the ignition switch is in the

ON position and the brake pedal is depressed.

Wiring Diagram - CVT SHIFT LOCK SYSTEM - Coupe

INFOID:0000000004201971

ABDWA0085GB

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