Transmission. Camry. Acv40 Gsv40
U250E Automatic Transaxle. Camry. Acv40 Gsv40
INSPECT SPEED SENSOR INSTALLATION
CHECK HARNESS AND CONNECTOR (SPEED SENSOR - ECM)
DTC P0793 Intermediate Shaft Speed Sensor "A" |
DESCRIPTION
This sensor detects the rotation speed of the counter gear. By comparing the counter gear speed signal (NC) with the direct clutch speed sensor signal (NT), the ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions. Thus smooth gear shifting is performed.| DTC No. | DTC Detection Condition | Trouble Area |
| P0793 | ECM detects conditions (a), (b) and (c) continuously for 5 sec. or more: (1-trip detection logic)
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Check the waveform between terminals NC+ and NC- of the ECM connector.
- Standard: Refer to the illustration.:
Terminal NC+ - NC- Tool setting 1 V/DIV., 1ms./DIV. Vehicle condition Vehicle speed 30 km/h (19 mph): (3rd gear)
Engine speed 1,400 rpm
MONITOR DESCRIPTION
The NC terminal of the ECM detects a revolution signal from the speed sensor (NC) (counter gear rpm). The ECM calculates a gearshift comparing the speed sensor (NT) with the speed sensor (NC).While the vehicle is operating in 2nd, 3rd, 4th or 5th gear in the shift position of D, if the counter gear revolution is less than 300 rpm *1although the output shaft revolution is more than 1,000 rpm *2, the ECM detects the trouble, illuminates the MIL and stores the DTC.
*1: Pulse is not output or is irregularly output.
*2: The vehicle speed is 50 km/h (31 mph) or more.
WIRING DIAGRAM
INSPECTION PROCEDURE
| DATA LIST |
- HINT:
- Using the intelligent tester Data List allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the Data List early in troubleshooting is one way to shorten labor 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 ignition switch off.
Connect the intelligent tester to the DLC3.
Turn the ignition switch to the ON position.
Turn on the tester.
Select the item "Enter / Powertrain / ECT / Data List".
Follow the instructions on the tester and read the Data List.
| Item | Measurement Item/ Range (display) | Normal Condition |
| SPD (NC) | Counter Gear Speed/ display: 50 r/min | [HINT] 3rd when shift lever position is D position (After warming up the engine);
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- HINT:
- SPD (NC) is always 0 while driving:
Open or short in the sensor or circuit. - SPD (NC) is always more than 0 and less than 300 rpm while driving the vehicle at 50 km/h (31 mph) or more:
Sensor trouble, improper installation, or intermittent connection trouble of the circuit.
| 1.INSPECT SPEED SENSOR INSTALLATION |
Check the speed sensor installation.
- OK:
- The installation bolt is tightened properly and there is no clearance between the sensor and transaxle case.
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| OK | |
| 2.INSPECT SPEED SENSOR (NC) |
Disconnect the speed sensor connector from the transaxle.
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Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Specified Condition
20 °C (68 °F)1 - 2 560 to 680 Ω
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| OK | |
| 3.CHECK HARNESS AND CONNECTOR (SPEED SENSOR - ECM) |
Connect the speed sensor connector.
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Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Specified Condition
20 °C (68 °F)C24-101 (NC+) - C24-102 (NC-) 560 to 680 Ω
Measure the resistance according to the value(s) in the table below.
- Standard resistance (Check for short):
Tester Connection Specified Condition C24-101 (NC+) - Body ground 10 kΩ or higher C24-102 (NC-) - Body ground
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| OK | ||
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