Dtc P0793 Intermediate Shaft Speed Sensor A
DESCRIPTION
MONITOR DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT SPEED SENSOR (INSTALLATION)
INSPECT SPEED SENSOR NC
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 approximately 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):
(a) Vehicle speed: 50 km/h (31 mph) or more
(b) Park/Neutral position switch NSW is OFF
(c) Speed sensor NC: Less than 300 rpm
| - Open or short in speed sensor NC circuit
- Speed sensor NC
- ECM
|
MONITOR DESCRIPTION
The NC terminal of the ECM detects revolution signals from speed sensor NC (counter gear rpm). The ECM calculates gear shifts by comparing speed sensor NT with speed sensor NC.While the vehicle is operating in the 2nd, 3rd, 4th or 5th gear position with the shift lever on D, if the counter gear revolution is less than 300 rpm*1 and 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
- HINT:
- Using the intelligent tester 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 ignition switch OFF.
- Connect the intelligent tester to the DLC3.
- Turn the ignition switch ON and turn the tester ON.
- Enter the following menus: Powertrain / Engine and ECT / Data List.
- Follow the instructions on the tester and read the Data List.
Tester Display
| Measurement Item/ Range
| Normal Condition
| Diagnostic Note
|
SPD (NC)
| Counter gear speed/
Min.: 0 rpm
Max.: 12,750 rpm
| 3rd gear when shift lever is on D (after warming up the engine);
Intermediate shaft speed (NC) becomes close to the engine speed
| Data is displayed in increments of 50 rpm
|
- HINT:
- SPD (NC) is always 0 rpm 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 NC installation.
- OK:
- Installation bolt is tightened properly and there is no clearance between the sensor and transaxle case.
| 2.INSPECT SPEED SENSOR NC |
Disconnect the speed sensor connector from the transaxle.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
| Condition
| Specified Condition
|
1 - 2
| 20°C (68°F)
| 560 to 680 Ω
|
| 3.CHECK HARNESS AND CONNECTOR (SPEED SENSOR - ECM) |
Connect the speed sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
| Condition
| Specified Condition
|
B96-4 (NC+) - B96-3 (NC-)
| 20°C (68°F)
| 560 to 680 Ω
|
B96-4 (NC+) - Body ground
| Always
| 10 kΩ or higher
|
B96-3 (NC-) - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
