P0720
P0720 Output Speed Sensor
Description
The output speed sensor detects the revolution of the parking gear and emits a pulse signal. The pulse signal is sent to the TCM which converts it into vehicle speed.
SDT Reference Value in Data List Mode
On Board Diagnosis Logic
- This is an OBD-II self-diagnostic item.
- Diagnostic trouble code "P0720" with SDT or 1st judgment flicker without SDT 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 signal before the vehicle starts moving.
Possible Cause
- Harness or connectors
(The sensor circuit is open or shorted.)
- Output speed sensor
- Vehicle speed signal
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 SDT
1 Turn ignition switch "ON". (Do not start engine.)
2 Select "Data list" mode for "AT" with SDT.
3 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 "Diagnosis Procedure".
If the check result is OK, go to following step.
4 Select "Data list" mode for "AT" with SDT.
5 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 "Diagnosis Procedure".
If the check result is OK, go to following step.
6 Maintain the following conditions for at least 5 consecutive seconds.
ENGINE SPEED: 3,500 rpm 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 "Diagnosis Procedure".
with GST
Follow the procedure "WITH SDT".
Diagnosis Procedure
1. CHECK INPUT SIGNAL
With SDT
1 Turn ignition switch ON.
2 Select "ECU INPUT SIGNALS" in "Data list" mode for "AT" with SDT.
3 Start the 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 Check] Main Power Supply and Ground Circuit Check.
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: Removal and Installation] Service and Repair.
2 Disconnect transmission range switch connector and TCM connector.
3 Check continuity between transmission range switch connector (A) terminals and TCM connector (B) 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 OUTPUT SPEED SENSOR AND CHECK DTC
1 Replace the output speed sensor. Refer to [Control Valve with TCM: Removal and Installation] Exploded View.
2 Perform "DTC Confirmation Procedure". Refer to "DTC Confirmation Procedure".
OK or NG
OK
INSPECTION END
NG
Replace the control valve with TCM. Refer to Service and Repair.
6. CHECK DTC
Perform "DTC Confirmation Procedure".
- Refer to "DTC Confirmation Procedure".
OK or NG
OK
INSPECTION END
NG
GO TO 2.