P0720
DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)Description
The revolution sensor detects the revolution of the idler gear 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
On-Board Diagnosis Logic
^ This is an OBD-II self-diagnostic item.
^ 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.
^ When TCM does not receive the proper voltage signal from the sensor.
^ After ignition switch is turned ON, irregular signal input from vehicle speed sensor MTR before the vehicle starts moving.
Possible Cause
^ Harness or connectors (Sensor circuit is open or shorted.)
^ Revolution sensor
^ Vehicle speed sensor MTR
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 "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. (Do not start engine.)
2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
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 "DATA MONITOR" mode for "ENGINE" with CONSULT-II.
6. Start engine and maintain the following conditions for at least 5 consecutive seconds.
VHCIL SPEED SE: 30 km/h (19 MPH) or more
THRTL POS SEN: More than 1.0/8
Selector lever: "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
THRTL POS SEN: More than 1.0/8
Selector lever: "D" position
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving conditions required for this test.
8. If DTC is detected, go to AT-122, "Diagnostic Procedure".
WITH GST
Follow the procedure "WITH CONSULT-II".
AT-VSSA/T-01:
Wiring Diagram - AT - VSSA/T
Diagnostic Procedure
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition switch ON.
2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
3. Start engine.
4. Read out the value of "VHCL/S SE-A/T" while driving.
Check the value changes according to driving speed.
OK or NG
OK >> GO TO 6.
NG >> GO TO 2.
2. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to "MAIN POWER SUPPLY AND GROUND CIRCUIT".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. DETECT MALFUNCTIONING ITEM
Check the following.
The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. CHECK SUB-HARNESS
1. Remove control valve with TCM. Refer to "Control Valve with TCM and A/T Fluid Temperature Sensor 2".
2. Disconnect park/neutral position switch connector and TCM connector.
3. Check continuity between park/neutral position switch connector terminals and TCM connector terminals.
4. If OK, check harness for short to ground and short to power.
5. Reinstall any part removed.
OK or NG
OK >> GO TO 5.
NG >> Replace open circuit or short to ground and short to power in harness or connectors.
5. REPLACE THE REVOLUTION SENSOR AND CHECK DTC
1. Replace the revolution sensor. Refer to "Revolution Sensor Components (2WD Models Only)" (2WD models) or "Disassembly", "Components" (AWD models).
2. Perform "DTC Confirmation Procedure". Refer to AT-119, "DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> Replace the control valve with TCM. Refer to "Control Valve with TCM and A/T Fluid Temperature Sensor 2".
6. CHECK DTC
Perform "DTC Confirmation Procedure".
Refer to AT-119, "DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.