Infiniti G37 Coupe. Manual - part 1318

P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)

TM-125

< COMPONENT DIAGNOSIS >

[5AT: RE5R05A]

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P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)

Description

INFOID:0000000001672135

The revolution sensor detects the revolution of the parking gear and emits a pulse signal. The pulse signal is
transmitted to the TCM which converts it into vehicle speed.

DTC Logic

INFOID:0000000001672136

DTC DETECTION LOGIC

DTC COMFIRMATION PROCEDURE

CAUTION:

• Always drive vehicle at a safe speed.
• Be careful not to rev engine into the red zone on the tachometer.
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 REVOLUTION SENSOR AND VEHICLE SPEED SENSOR MTR

 With CONSULT-III

1.

Start the engine.

2.

Select “DATA MONITOR”.

3.

Drive vehicle and check for an increase of “VHCL/S SE-A/T” value in response to “VHCL/S SE-MTR”
value.

Are “VHCL/S SE-A/T” and “VHCL/S SE-MTR” values correct?

YES

>> GO TO 2.

NO

>> Go to 

TM-126, "Diagnosis Procedure"

.

2.

CHECK DTC DETECTION 1

 With CONSULT-III

1.

Select “DATA MONITOR”.

2.

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

 With GST

DTC

Item

(CONSULT-III screen 

terms)

A/T CHECK indicator 
lamp judgment flicker

Diagnostic item is de-

tected when...

Possible cause

P0720

VEH SPD SEN/CIR AT

1st

• Signal from vehicle 

speed sensor A/T 
(revolution sensor) not 
input due to cut line or 
the like.

• Unexpected signal in-

put during running.

• After ignition switch is 

turned ON, unexpect-
ed signal input from 
vehicle speed sensor 
MTR before the vehi-
cle starts moving.

• Harness or connectors

(Sensor circuit is open 
or shorted.)

• Revolution sensor
• Vehicle speed sensor 

MTR

VHCL/S SE-A/T

: Approximately matches the speedometer reading.

VHCL/S SE-MTR

: Approximately matches the speedometer reading.

VHCL/S SE-A/T

: 30 km/h (19 MPH) or more

ACCELE POSI

: More than 1.0/8

SLCT LVR POSI

: “D” position

Drive location

: Driving the vehicle uphill (increased engine load) will help maintain the driving condi-
tions required for this test.

TM-126

< COMPONENT DIAGNOSIS >

[5AT: RE5R05A]

P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)

Follow the procedure “With CONSULT-III”.

Is “P0720 VEH SPD SEN/CIR AT” detected?

YES

>> Go to 

TM-126, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

CHECK DTC DETECTION 2

 With CONSULT-III

1.

Select “DATA MONITOR”.

2.

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

 With GST

Follow the procedure “With CONSULT-III”.

Is “P0720 VEH SPD SEN/CIR AT” detected?

YES

>> Go to 

TM-126, "Diagnosis Procedure"

.

NO

>> Check intermittent incident. Refer to 

GI-38, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000001672137

1.

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to 

TM-163, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace damaged parts.

2.

CHECK SUB-HARNESS

1.

Remove control valve with TCM. Refer to 

TM-232, "Exploded View"

.

2.

Disconnect park/neutral position switch connector and TCM connector.

3.

Check continuity between park/neutral position switch connector terminals and TCM connector terminals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

DETECT MALFUNCTIONING ITEM

Check the following.
• Check terminals of park/neutral position switch connector and TCM connector, and harness cladding for

damage.

• Check connector for loose connection.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

REPLACE THE REVOLUTION SENSOR AND CHECK DTC

1.

Replace the revolution sensor. Refer to 

TM-254, "Exploded View"

.

2.

Perform “DTC CONFIRMATION PROCEDURE”. Refer to 

TM-125, "DTC Logic"

.

ACCELE POSI

: More than 1.0/8

ENGINE SPEED

: 3,500 rpm or more

SLCT LVR POSI

: “D” position

Drive location

: Driving the vehicle uphill (increased engine load) will help maintain the driving condi-
tions required for this test.

Park/neutral position switch connector

TCM connector

Continuity

Connector

Terminal

Connector

Terminal

F154

8

F152

20

Existed

9

17

10

16

P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)

TM-127

< COMPONENT DIAGNOSIS >

[5AT: RE5R05A]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace the control valve with TCM. Refer to 

TM-232, "Exploded View"

.

TM-128

< COMPONENT DIAGNOSIS >

[5AT: RE5R05A]

P0725 ENGINE SPEED SIGNAL

P0725 ENGINE SPEED SIGNAL

Description

INFOID:0000000001672138

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

DTC Logic

INFOID:0000000001672139

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 the engine.

2.

Select “DATA MONITOR”.

3.

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-128, "Diagnosis Procedure"

.

NO

>> Check intermittent incident. Refer to 

GI-38, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000001672140

1.

CHECK DTC OF ECM

With CONSULT-III

1.

Turn ignition switch ON.

2.

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

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Check DTC detected item. Refer to 

EC-120, "CONSULT-III Function"

.

2.

CHECK DTC OF TCM

With CONSULT-III

1.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check DTC detected item. Refer to 

TM-112, "CONSULT-III Function (TRANSMISSION)"

.

3.

CHECK THE IGNITION SIGNAL CIRCUIT

1.

Start the engine.

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: