READ VALUE USING GTS (SPD (SP2) AND SP2 SENSOR VOLTAGE)
INSPECT TRANSMISSION REVOLUTION SENSOR (SP2)
CHECK HARNESS AND CONNECTOR (TRANSMISSION REVOLUTION SENSOR (SP2) - ECM)
DTC P0720 Output Speed Sensor Circuit |
DTC P0722 Output Speed Sensor Circuit No Signal |
DESCRIPTION
This sensor detects the rotation speed of the transmission output shaft and sends signals to the ECM. By comparing the input turbine speed signal (NT) with the output shaft speed sensor signal (SP2), the ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions. As a result, the gears shift smoothly.| DTC Code | DTC Detection Condition | Trouble Area |
| P0720 | When the transmission revolution sensor (SP2) input voltage is either higher than 1.9 V or below 0.1 V for 4.5 seconds or more (2 trip detection logic). |
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| P0722 | All conditions are met for 5 seconds or more (2 trip detection logic): (a) Park/neutral position switch D input signal is ON. (b) Either condition is met.
(d) No signal from transmission revolution sensor (SP2) is input to the ECM. |
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MONITOR DESCRIPTION
The transmission revolution sensor (SP2) detects the transmission output shaft speed. The ECM calculates gear shifts comparing the transmission revolution sensor (NT) with the transmission revolution sensor (SP2).If the ECM detects no signal from the transmission revolution sensor (SP2) even while the vehicle is moving, it will conclude that there is a malfunction in the transmission revolution sensor (SP2). The ECM will illuminate the MIL and store the DTC.
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- Perform registration and/or initialization when parts related to the automatic transmission are replaced (LandCruiser RM000000O7H0HSX.html).
- HINT:
- After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
- Perform the D Position Shift Test in Road Test (LandCruiser RM000000W790SGX.html).*1
- Turn the engine switch off.
- Perform step (*1) again.
- Check for DTCs again (LandCruiser RM000000W7711KX.html).
| DATA LIST |
- HINT:
- Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.
- NOTICE:
- In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.
Warm up the engine.
Turn the engine switch off.
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List.
According to the display on the GTS, read the Data List.
Engine and ECT Tester Display Measurement Item/Range Normal Condition Diagnostic Note SPD (SP2) Output shaft speed/
Min.: 0 km/h (0 mph)
Max.: 255 km/h (158 mph)0 km/h (0 mph): Vehicle stopped (equal to vehicle speed) - - HINT:
- SPD (SP2) is always 0 while driving: Open or short in the sensor or circuit.
- SPD (SP2) value displayed on the GTS is much lower than the actual vehicle speed: Sensor trouble, improper installation, or intermittent connection trouble of the circuit.
| 1.READ VALUE USING GTS (SPD (SP2) AND SP2 SENSOR VOLTAGE) |
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List
In accordance with the display on the GTS, read the Data List.
Engine and ECT Tester Display Measurement Item/Range Normal Condition Diagnostic Note SPD (SP2) Output shaft speed/
Min.: 0 km/h (0 mph)
Max.: 255 km/h (158 mph)0 km/h (0 mph): Vehicle stopped (equal to vehicle speed) - SP2 Sensor Voltage Transmission revolution sensor (SP2) output voltage/
Min.: 0.000 V
Max.: 4.999 V0.1 to 1.9 V: Engine idling - Result Result Proceed to Data display is not within Normal Condition range A Data display is within Normal Condition range B
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| A | |
| 2.INSPECT TRANSMISSION REVOLUTION SENSOR (SP2) |
Remove the transmission revolution sensor (SP2) (LandCruiser RM000000OE406OX.html).
Connect the battery to the sensor as shown in the illustration.
Text in Illustration *1 Transmission Revolution Sensor (SP2) *2 Ammeter *3 Battery *4 Magnet *a 5 mm (0.197 in.) or less - -
Wave a magnetic object left and right in front of the transmission revolution sensor (SP2) tip (5 mm (0.197 in.) or less) to change the high/low signals while measuring the current.
- NOTICE:
- Make sure to wave the magnetic object during the inspection. The current will not change without waving the magnetic object as indicated by the arrow in the illustration.
Measure the current according to the value(s) in the table below.
- Standard Current:
Tester Connection Condition Specified Condition 1 (SP2O) - 2 (SP2B) Low signal 4 to 8 mA 1 (SP2O) - 2 (SP2B) High signal 12 to 16 mA
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| OK | |
| 3.CHECK HARNESS AND CONNECTOR (TRANSMISSION REVOLUTION SENSOR (SP2) - ECM) |
Disconnect the C147 transmission revolution sensor (SP2) connector.
Disconnect the C151 ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition C147-2 (SP2B) - C151-10 (SP2B) Always Below 1 Ω C147-1 (SP2O) - C151-11 (SP2O) Always Below 1 Ω C147-2 (SP2B) - Body ground Always 10 kΩ or higher C147-1 (SP2O) - Body ground Always 10 kΩ or higher
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| OK | ||
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