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Nissan Frontier D22. Manual - part 73

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

AT-261

[RE4R01A]

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

PFP:32702

Description

ECS007MC

The revolution sensor detects the revolution of the output shaft park-
ing pawl lock gear and emits a pulse signal. The pulse signal is sent
to the TCM which converts it into vehicle speed.

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.

●

Be careful not to rev engine into the red zone on the tachometer.

NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE” 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 malfunction is eliminated.

AAT478A

Terminal

No.

Wire color

Item

Condition

Judgement stan-

dard (Approx.)

Revolution sen-
sor
(Measure in AC
range)

When vehicle cruises at 30 km/h (19
MPH).

1V or more
Voltage rises
gradually in
response to vehi-
cle speed.

When vehicle parks.

Throttle position
sensor
(Ground)

—

Diagnostic trouble code

Malfunction is detected when ...

Check item (Possible cause)

: VEH SPD SEN/CIR AT

TCM does not receive the proper voltage
signal from the sensor.

●

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

●

Revolution sensor

: P0720

AT-262

[RE4R01A]

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

With CONSULT-II

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

Drive vehicle and check for an increase of “VHCL/S SE·MTR”
value.
If the check result is NG, go to

AT-264, "Diagnostic Procedure"

If the check result is OK, go to following step.

Select “DATA MONITOR” mode for “ENGINE” with CONSULT-II.

Start engine and maintain the following conditions for at least 5
consecutive seconds.
VHCL SPEED SE: 30 km/h (19 MPH) or more
THRTL POS SEN: More than 1.2V

Selector lever: D position (O/D ON)
Driving condition: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
If the check result is NG, go to

AT-264, "Diagnostic Procedure"

If the check result is OK, go to following step.

Maintain the following conditions for at least 5 consecutive sec-
onds.
CMPS·RPM (REF): 3,500 rpm or more
THRTL POS SEN: More than 1.2V
Selector lever: D position (O/D ON)
Driving condition: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions required for this test.

With GST

●

Follow the procedure “With CONSULT-II”.

SAT014K

SAT971J

SEF949Y

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

AT-263

[RE4R01A]

Wiring Diagram — AT — VSSA/T

ECS007MD

WCWA0148E

AT-264

[RE4R01A]

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

Diagnostic Procedure

ECS007ME

CHECK REVOLUTION SENSOR

Refer to

AT-265, "Component Inspection"

OK or NG

>> GO TO 2.

>> Repair or replace revolution sensor.

CHECK INPUT SIGNAL

With CONSULT-II

Start engine.

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

Read out the value of “VHCL/S SE·A/T” while driving.
Check the value changes according to driving speed.

Without CONSULT-II

Start engine.

Check voltage between TCM harness connector M78 terminal 29 (Y) and ground while driving.
(Measure with AC range)

OK or NG

>> GO TO 3.

>> Check the following items:

●

Harness for short or open between TCM and revolution sensor (Main harness)

●

Harness for short or open between revolution sensor harness connector E73 and ECM harness
connector M78

●

Ground circuit for ECM
Refer to

AT-246, "TROUBLE DIAGNOSIS FOR POWER SUPPLY"

SAT614J

Voltage

At 0 km/h (0 MPH)

: 0V

At 30 km/h (19 MPH)

: 1V or more

(Voltage rises gradually
in response to vehicle
speed.)

LCIA0290E

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