P0722
DTC P0722 Output Speed Sensor Circuit No SignalDESCRIPTION
The speed sensor SP2 detects the rotation speed of the transmission output shaft and sends signals to the ECM. The ECM determines the vehicle speed based on these signals. An AC voltage is generated in the speed sensor SP2 coil as the parking gear mounted on the rear planetary gear assembly rotates, and this voltage is sent to the ECM. The parking gear on the rear planetary gear is used as the timing rotor for this sensor. The gear shift point and lock-up timing are controlled by the ECM based on the signals from the vehicle speed sensor and the throttle position sensor.
Reference (Using an oscilloscope):
Check the waveform between terminals SP2+ and SP2- of the ECM connector.
Standard: Refer to the illustration.
MONITOR DESCRIPTION
The output speed sensor monitors the output shaft speed. The ECM controls the gearshift point and the lock up timing based on the signals from the output speed sensor and throttle position sensor. If the ECM detects no signal from the output shaft speed sensor even while the vehicle is moving, it will conclude that is a malfunction in the output speed sensor. The ECM will illuminate the MIL and set the DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
WIRING DIAGRAM:
INSPECTION PROCEDURE
HINT: According to the DATA LIST displayed on the intelligent tester, you can read the values of components, such as the switches, sensors and actuators, without removing any parts. Reading the DATA LIST as a first step of troubleshooting is one method of shortening labor time.
NOTICE: In the table, the values listed under "Normal Condition" are for reference only. Do not depend solely on these reference values when judging whether a part is faulty or not.
1. Connect the intelligent tester together with the CAN VIM (Controller Area Network Vehicle Interface Module) to the DLC3.
2. Turn the ignition switch to the ON position.
3. Push the "ON" button of the tester.
4. Select the items "DIAGNOSIS / ENHANCED OBD II / DATA LIST / A/T".
5. According to the display on the tester, read the "DATA LIST".
HINT:
^ SPD (SP2) is always 0 while driving: Open or short in the sensor or circuit.
^ The SPD (SP2) value displayed on the tester is much lower than the actual vehicle speed: Sensor trouble, improper installation, or intermittent connection trouble of the circuit.
Steps 1-3(Part 1):
Step 3(Part 2):
