Nissan Frontier D22. Manual - part 74

DTC P0720 VEHICLE SPEED SENSOR·A/T (REVOLUTION SENSOR)

AT-265

[RE4R01A]

D

E

F

G

H

I

J

K

L

M

A

B

AT

3. 

CHECK DTC

Perform Diagnostic Trouble Code (DTC) confirmation procedure. Refer to 

AT-261, "DIAGNOSTIC TROUBLE

CODE (DTC) CONFIRMATION PROCEDURE"

 .

OK or NG

OK

>> INSPECTION END

NG

>> 1. Perform TCM input/output signal inspection.

2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.

Component Inspection

ECS007MF

REVOLUTION SENSOR

●

For removal, refer to 

AT-407, "Removal"

 .

●

Check resistance between terminals 1 and 2.

Terminal No.

Resistance

1

2

500 - 650

Ω

AAT487A

AT-266

[RE4R01A]

DTC P0725 ENGINE SPEED SIGNAL

DTC P0725 ENGINE SPEED SIGNAL

PFP:24825

Description

ECS007MG

The engine speed signal is sent from the ECM to the TCM.

TCM TERMINALS AND REFERENCE VALUE

Remarks: Specification data are reference values.

ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE

CAUTION:

Always drive vehicle at a safe speed.

NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch OFF and wait at least 5 seconds before conducting the
next test.
After the repair, perform the following procedure to confirm the mal-
function is eliminated.

 With CONSULT-II

1.

Turn ignition switch ON and select “DATA MONITOR” mode for
“ENGINE” with CONSULT-II.

2.

Start engine and maintain the following conditions for at least 10
consecutive seconds.
VHCL SPEED SE: 10 km/h (6 MPH) or more
THRTL POS SEN: More than 1.2V
Selector lever: D position (O/D ON)

 With GST

●

Follow the procedure “With CONSULT-II”.

Terminal 

No.

Wire color

Item

Condition

Judgement stan-

dard (Approx.)

39

P/L

Engine speed 
signal

When engine runs at idle speed.

0.5 - 2.5V

Diagnostic trouble code

Malfunction is detected when ...

Check item (Possible cause)

: ENGINE SPEED SIG

TCM does not receive the proper voltage 
signal from ECM.

●

Harness or connectors
(The sensor circuit is open or shorted)

: P0725

SAT014K

SEF949Y

DTC P0725 ENGINE SPEED SIGNAL

AT-267

[RE4R01A]

D

E

F

G

H

I

J

K

L

M

A

B

AT

Wiring Diagram — AT — ENGSS

ECS007MH

WCWA0149E

AT-268

[RE4R01A]

DTC P0725 ENGINE SPEED SIGNAL

Diagnostic Procedure

ECS007MI

1. 

CHECK DTC WITH ECM

Perform diagnostic test mode II (self-diagnostic results) for engine control. Check ignition signal circuit condi-
tion.

OK or NG

OK

>> GO TO 2.

NG

>> Check ignition signal circuit for engine control. Refer to 

EC-1134

  (VG33E only) or 

EC-1710

(VG33ER only), “IGNITION SIGNAL”.

2. 

CHECK INPUT SIGNAL

With CONSULT-II

1.

Start engine.

2.

Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.

3.

Read out the value of “ENGINE SPEED”.
Check engine speed changes according to throttle position.

 Without CONSULT-II

1.

Start engine.

2.

Check voltage between TCM harness connector M78 terminal 39 and ground.

Does battery voltage (idle speed) 0.5 - 2.5V?

Yes

>> GO TO 3.

No

>> Check the following items:

●

Harness for short or open between TCM connector M78 and ECM connector F29

●

Resistor

●

Ignition coil
Refer to 

EC-1134

  (VG33E only) or 

EC-1710

  (VG33ER only), “IGNITION SIGNAL”.

SAT645J

AAT488A