Infiniti EX35. Manual — part 1417

TM-56

< COMPONENT DIAGNOSIS >

[5AT: RE5R05A]

P0725 ENGINE SPEED SIGNAL

P0725 ENGINE SPEED SIGNAL

Description

INFOID:0000000003130490

The engine speed signal is transmitted from the ECM to the TCM with CAN communication line.

DTC Logic

INFOID:0000000003130491

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.

CHECK DTC DETECTION

With CONSULT-III

Start the engine.

Select “Data Monitor” mode for “TRANSMISSION”.

Drive vehicle and maintain the following conditions for at least 10 consecutive seconds.

With GST

Follow the procedure “With CONSULT-III”.

Is “P0725 ENGINE SPEED SIG” detected?

YES

>> Go to

TM-56, "Diagnosis Procedure"

>> Check intermittent incident. Refer to

GI-38, "Intermittent Incident"

Diagnosis Procedure

INFOID:0000000003130492

CHECK DTC OF ECM

With CONSULT-III

Turn ignition switch ON.

Select “Self Diagnostic Results” mode for “ENGINE”.

Is any DTC other than “P0725 ENGINE SPEED SIG” detected?

YES

>> Check DTC detected item. Refer to

EC-113, "CONSULT-III Function"

>> GO TO 2.

CHECK DTC OF TCM

With CONSULT-III

Select “Self Diagnostic Results” mode for “TRANSMISSION”.

Is any DTC other than “P0725 ENGINE SPEED SIG” detected?

YES

>> Check DTC detected item. Refer to

TM-40, "CONSULT-III Function (TRANSMISSION)"

>> GO TO 3.

CHECK THE IGNITION SIGNAL CIRCUIT

With CONSULT-III

DTC

Item

(CONSULT-III screen

terms)

A/T CHECK indicator
lamp judgment flicker

Diagnostic item is de-

tected when...

Possible cause

P0725

ENGINE SPEED SIG

16th

TCM does not receive
the CAN communication
signal from the ECM.

Harness or connectors
(ECM to TCM circuit is
open or shorted.)

VHCL/S SE-A/T

: 10 km/h (6 MPH) or more

ACCELE POSI

: More than 1.0/8

SLCT LVR POSI

: “D” position:

P0725 ENGINE SPEED SIGNAL

TM-57

< COMPONENT DIAGNOSIS >

[5AT: RE5R05A]

Start the engine.

Select “Data Monitor” mode for “TRANSMISSION”.

Check for engine speed change corresponding to “ACCELE POSI” while monitoring “ENGINE SPEED”.

Is the inspection result normal?

YES

>> GO TO 4.

>> Check ignition signal circuit. Refer to

EC-458, "Description"

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to

TM-89, "Diagnosis Procedure"

Is the inspection result normal?

YES

>> Replace the control valve with TCM. Refer to

TM-162, "Exploded View"

>> Repair or replace damaged parts.

Item name

Condition

Value

ENGINE SPEED

Engine running

Closely matches the tachometer reading.

ACCELE POSI

Released accelerator pedal.

0.0/8

Fully depressed accelerator pedal

8.0/8

TM-58

< COMPONENT DIAGNOSIS >

[5AT: RE5R05A]

P0731 A/T 1ST GEAR FUNCTION

P0731 A/T 1ST GEAR FUNCTION

Description

INFOID:0000000003130493

This malfunction is detected when the A/T does not shift into 1st gear position as instructed by TCM. This is
not only caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such as
control valve sticking, improper solenoid valve operation, etc.

DTC Logic

INFOID:0000000003130494

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

CHECK ATF TEMPERATURE

With CONSULT-III

Start the engine.

Select “Data Monitor” mode for “TRANSMISSION”.

Check ATF temperature is in the following range.

With GST

Start the engine.

Drive vehicle for approximately 5 minutes in urban areas, GO TO 2.

Is ATF temperature within specified range?

YES

>> GO TO 2.

>> Drive vehicle to warm ATF or stop engine to cool ATF.

CHECK SYMPTOM 1

With CONSULT-III

Select “DTC & SRT Confirmation” for “TRANSMISSION”.

Select “1ST GR FNCTN P0731” of “DTC WORK SUPPORT” mode.

Drive vehicle and maintain the following conditions.

DTC

Item

(CONSULT-III screen

terms)

A/T CHECK indicator
lamp judgment flicker

Diagnostic item is de-

tected when...

Possible cause

P0731

A/T 1ST GR FNCTN

18th

TCM detects any incon-
sistency in the actual
gear ratio.

• Input clutch solenoid

valve

• Front brake solenoid

valve

• Direct clutch solenoid

valve

• High and low reverse

clutch solenoid valve

• Each clutch and brake
• Hydraulic control cir-

cuit

ATF TEMP 1

: 20

C (68

F) – 140

C (284

MANU MODE SW

: ON

GEAR

: “1” position

ACCELE POSI

: 0.6/8 or more

VEHICLE SPEED

: 10 km/h (6 MPH) or more

P0731 A/T 1ST GEAR FUNCTION

TM-59

< COMPONENT DIAGNOSIS >

[5AT: RE5R05A]

Keep the current driving status for at least 5 consecutive seconds if CONSULT-III screen changes from
“OUT OF CONDITION” to “TESTING”.

CAUTION:

If “TESTING” does not appear on CONSULT-III for a long time, select “Self Diagnostic Results”
mode for “TRANSMISSION”. In case a 1st trip DTC other than “P0731 A/T 1ST GR FNCTN” is
shown, refer to “SELF DIAGNOSTIC RESULTS”. Refer to

TM-40, "CONSULT-III Function (TRANS-

MISSION)"

With GST

Drive vehicle and maintain the following conditions for at least 5 consecutive seconds.

Check DTC.

Is “STOP VEHICLE” or “COMPLETED RESULT NG” displayed? / Is “P0731 A/T 1ST GR FNCTN” detected?

YES-1 >> “STOP VEHICLE”: GO TO 3.
YES-2 >> “COMPLETED RESULT NG”: Go to

TM-59, "Diagnosis Procedure"

YES-3 >> “P0731 A/T 1ST GR FNCTN” is detected: Go to

TM-59, "Diagnosis Procedure"

>> Check intermittent incident. Refer to

GI-38, "Intermittent Incident"