Nissan Frontier D22. Manual — part 73
DTC P0720 VEHICLE SPEED SENSOR·A/T (REVOLUTION SENSOR)
AT-261
[RE4R01A]
D
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AT
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.)
29
Y
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.
0V
42
BR
Throttle position
sensor
(Ground)
—
0V
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
1.
Turn ignition switch ON and select “DATA MONITOR” mode for
“A/T” with CONSULT-II.
2.
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.
3.
Select “DATA MONITOR” mode for “ENGINE” with CONSULT-II.
4.
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.
5.
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]
D
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AT
Wiring Diagram — AT — VSSA/T
ECS007MD
WCWA0148E
AT-264
[RE4R01A]
DTC P0720 VEHICLE SPEED SENSOR·A/T (REVOLUTION SENSOR)
Diagnostic Procedure
ECS007ME
1.
CHECK REVOLUTION SENSOR
AT-265, "Component Inspection"
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace revolution sensor.
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 “VHCL/S SE·A/T” while driving.
Check the value changes according to driving speed.
Without CONSULT-II
1.
Start engine.
2.
Check voltage between TCM harness connector M78 terminal 29 (Y) and ground while driving.
(Measure with AC range)
OK or NG
OK
>> GO TO 3.
NG
>> 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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