Nissan Altima L32. Manual - part 1504

TM-360

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

P1745 LINE PRESSURE CONTROL

P1745 LINE PRESSURE CONTROL

Description

INFOID:0000000004201957

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.

DTC Logic

INFOID:0000000004201958

DTC DETECTION LOGIC

DTC CONFIRMATION 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.

1.

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.

Is “P1745 L/PRESS CONTROL” detected?

YES

>> Go to 

TM-360, "Diagnosis Procedure"

.

NO

>> Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000004201959

1.

CHECK DTC

With CONSULT-III

1. Start engine.

2. Perform “SELF-DIAG RESULTS” mode for “TRANSMISSION”.
is “P1745 L/PRESS CONTROL” displayed?

YES

>> Replace TCM. Refer to 

TM-430, "Removal and Installation"

.

NO

>> Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

DTC

Item

(CONSULT-III screen term)

Malfunction is detected when...

Possible cause

P1745

L/PRESS CONTROL

TCM detects the unexpected line pressure.

TCM

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)

P1777 STEP MOTOR

TM-361

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

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P1777 STEP MOTOR

Description

INFOID:0000000004201960

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

DTC Logic

INFOID:0000000004201961

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

Always drive vehicle at a safe speed.

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.

1.

CHECK DTC DETECTION

With CONSULT-III

1. Start engine.

2. Drive vehicle for at least 5 consecutive seconds.

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

With GST

Follow the procedure “With CONSULT-III”.
Is “P1777 STEP MOTR CIRC” detected?

YES

>> Go to 

TM-361, "Diagnosis Procedure"

.

NO

>> Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000004201962

1.

CHECK STEP MOTOR CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect TCM harness connector.

3. Check resistance between TCM harness connector F16 terminal

27, 29 and 28, 30.

DTC

Item

(CONSULT-III screen term)

Malfunction is detected when...

Possible cause

P1777

STEP MOTR CIRC

Each coil of the step motor is not energized 
properly due to an open or a short.

• Harness or connectors

(Step motor circuit is open or shorted.)

• Step  motor

TCM harness connector

Resistance (Ap-

prox.)

Connector

Terminal

F16

27

28

30.0 

Ω

29

30

AWDIA0148ZZ

TM-362

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

P1777 STEP MOTOR

4. Check resistance between TCM harness connector F16 terminal

27, 28, 29, 30 and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 2.

2.

CHECK HARNESS BETWEEN TCM AND CVT UNIT (STEP MOTOR) (PART 1)

1. Disconnect CVT unit harness connector.

2. Check continuity between TCM harness connector F16 (A) ter-

minal 27, 28, 29, 30 and CVT unit harness connector F46 (B)

terminal 9, 8, 7, 6.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

CHECK HARNESS BETWEEN TCM AND CVT UNIT (STEP MOTOR) (PART 2)

Check continuity between TCM harness connector F16 terminal 27,

28, 29, 30 and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

CHECK STEP MOTOR

Check step motor. Refer to 

TM-363, "Component Inspection (Step Motor)"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK DTC

With CONSULT-III

1. Turn ignition switch ON.

2. Perform “SELFDIAG RESULTS” mode for “TRANSMISSION”.

TCM harness connector

Ground

Resistance (Ap-

prox.)

Connector

Terminal

F16

27

15.0 

Ω

28

29

30

AWDIA0149ZZ

TCM harness connector

CVT unit harness connector

Continuity

Connector

Terminal

Connector

Terminal

F16 (A)

27

F46 (B)

9

Existed

28

8

29

7

30

6

AWDIA0150ZZ

TCM harness connector

Ground

Continuity

Connector

Terminal

F16

27

Not existed

28

29

30

AWDIA0149ZZ

P1777 STEP MOTOR

TM-363

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

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Is “P1777 STEP MOTER CIRC” detected?

YES (Only DTC P1777 detected)>>Replace control valve. Refer to 

TM-447, "Exploded View"

.

YES (DTC P0725 and DTC U1000 in addition to DTC P1777 are detected)>>When  DTC  is  detected  as

listed below, replace control valve. Refer to 

TM-447, "Exploded View"

.

• DTC for P1777 and P0725 are detected.

• DTC for P1777 and U1000 are detected.

• DTC for P1777, P0725 and U1000 are detected.

NO

>> Replace transaxle assembly. Refer to 

TM-447, "Removal and Installation"

.

6.

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"

.

NO

>> Repair or replace damaged parts.

Component Inspection (Step Motor)

INFOID:0000000004201963

1.

CHECK STEP MOTOR

1. Check resistance between CVT unit terminal 6, 8 and 7, 9.

2. Check resistance between CVT unit terminal 6, 7, 8, 9 and

ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Perform “SELFDIAG RESULTS” mode for “TRANSMISSION”.

CVT unit terminal

Resistance (Approx.)

6

7

30.0 

Ω

8

9

AWDIA0151ZZ

CVT unit terminal

Ground

Resistance (Approx.)

6

15.0 

Ω

7

8

9

AWDIA0152ZZ