P0793
DTC P0793 INTERMEDIATE SHAFT SPEED SENSOR "A"CIRCUIT DESCRIPTION
DTC Detection Condition:
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.
Reference (Using an oscilloscope):
Check the waveform between terminals NC+ and NC- of the ECM connector.
Standard: Refer to the illustration.
MONITOR DESCRIPTION
Monitor Strategy:
Typical Enabling Conditions:
Typical Malfunction Thresholds:
Component Operating Range:
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 or O/D gear in the shift position of D, if the counter gear revolution is less than 300 rpm*1 although 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:
Step 1:
Step 2 - 3:
INSPECTION PROCEDURE
HINT: According to the DATA LIST displayed by the OBD II scan tool or hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of troubleshooting is one method to shorten labor time.
a. Warm up the engine.
b. Turn the ignition switch off.
c. Connect the OBD II scan tool or hand-held tester to the DLC3.
d. Turn the ignition switch to the ON position.
e. Push the "ON" button of the OBD II scan tool or the hand-held tester.
f. When you use hand-held tester: Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST".
g. According to the display on the tester, read the "DATA LIST".
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.