P0793

U241E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: P0793: Intermediate Shaft Speed Sensor "A"

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.






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 2nd, 3rd, or 4th gear with the shift lever in D, if the counter gear revolution speed is less than 300 rpm*1 and the output shaft revolution speed 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.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

1. DATA LIST
HINT: Using the Techstream 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.

(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Engine and ECT / Data List.
(g) Follow the instructions on the Techstream and read the Data List.





HINT:
- SPD (NC) is always 0 rpm while driving:
Open or short in the sensor or circuit.
- SPD (NC) is always more than 0 rpm 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.

PROCEDURE

1. INSPECT SPEED SENSOR NC (INSTALLATION)




(a) Check the speed sensor NC installation.
OK:
Installation bolt is tightened properly and there is no clearance between the sensor and transaxle case.
NG -- SECURELY INSTALL SENSOR OR REPLACE SPEED SENSOR NC
OK -- Continue to next step.
2. INSPECT SPEED SENSOR NC




(a) Disconnect the B32 speed sensor NC connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE SPEED SENSOR NC
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (SPEED SENSOR NC - ECM)




(a) Disconnect the B33 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM