Infiniti M35/M45 Y50. Manual - part 49
DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)
AT-119
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DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)
PFP:32702
Description
NCS001LE
The revolution sensor detects the revolution of the parking pawl lock gear and emits a pulse signal. The pulse
signal is sent to the TCM which converts it into vehicle speed.
CONSULT-II Reference Value
NCS001LF
On Board Diagnosis Logic
NCS001LG
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This is an OBD-II self-diagnostic item.
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Diagnostic trouble code “P0720 VEH SPD SEN/CIR AT” with CONSULT-II or 1st judgement flicker without
CONSULT-II is detected under the following conditions.
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When TCM does not receive the proper voltage signal from the sensor.
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After ignition switch is turned ON, irregular signal input from vehicle speed sensor MTR before the vehicle
starts moving.
Possible Cause
NCS001LH
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Harness or connectors
(Sensor circuit is open or shorted.)
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Revolution sensor
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Vehicle speed sensor MTR
DTC Confirmation Procedure
NCS001LI
CAUTION:
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Always drive vehicle at a safe speed.
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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 and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for
“A/T” with CONSULT-II and check monitor “VHCL/S SE-A/T”,
“ENGINE SPEED”, “ACCELE POSI” and “SLCT LVR POSI ”. .
3.
Touch “START”.
4.
Drive vehicle and check for an increase of “VHCL/S SE-A/T”
value in response to “VHCL/S SE-MTR” value.
If the check result is NG, go to
AT-122, "Diagnostic Procedure"
If the check result is OK, go to following step.
5.
Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II.
6.
Start engine and maintain the following conditions for at least 5 consecutive seconds.
VHCL/S SE-A/T: 30 km/h (19 MPH) or more
ACCELE POSI: More than 1.0/8
SLCT LVR POSI: “D” position
Driving location: 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-122, "Diagnostic Procedure"
If the check result is OK, go to following step.
7.
Maintain the following conditions for at least 5 consecutive seconds.
ENGINE SPEED: 3,500 rpm or more
ACCELE POSI: More than 1.0/8
Item name
Condition
Display value
VHCL/S SE-A/T
During driving
Approximately matches the speedometer reading.
BCIA0030E