Dtc P0793 Intermediate Shaft Speed Sensor A
DESCRIPTION
MONITOR DESCRIPTION
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
COMPONENT OPERATING RANGE
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 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)
- (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 transmission revolution sensor NC (speed sensor NC) circuit
- Transmission revolution sensor NC (speed sensor NC)
- ECM
|
Reference (Using an oscilloscope):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., 1 ms./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.
MONITOR STRATEGY
Related DTCs
| P0793: Speed sensor (NC)/Verify pulse input
|
Required sensors/Components
| Speed sensor (NC), Speed sensor (NT), Park/neutral position switch
|
Frequency of operation
| Continuous
|
Duration
| 5 sec.
|
MIL operation
| Immediate
|
Sequence of operation
| None
|
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present.
| P0500 (VSS)
P0748, P0778, P0798 (Shift solenoid valve(range))
|
Engine
| Running
|
NSW switch
| OFF
|
Output shaft revolution
| 1,000 rpm or more
|
Battery voltage
| 8 V or more
|
Ignition switch
| ON
|
Starter
| OFF
|
TYPICAL MALFUNCTION THRESHOLDS
Intermediate shaft speed sensor revolution
| Less than 300 rpm
|
COMPONENT OPERATING RANGE
Counter gear speed sensor (NC)
| - HINT:
- 3rd when shift lever position is D position (After warming up the engine);
- Intermediate shaft speed (NC) becomes close to the engine speed.
|
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- Perform the universal trip to clear permanent DTCs (Link).
- HINT:
- Using 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.
Warm up the engine.
Turn the ignition switch off.
Connect Techstream to the DLC3.
Turn the ignition switch to the on position.
Turn on the tester.
Select the item "Powertrain / Engine and ECT / Data List".
According to the display on the tester, read the "Data List".
Tester Display
| Measurement Item/Range
| Normal Condition
| Diagnostic Note
|
SPD (NC)
| Counter Gear Speed/display: 50 r/min
| - HINT:
- 3rd when shift lever position is D position (After warming up the engine);
- Intermediate shaft speed (NC) becomes close to the engine speed.
| -
|
- 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.
| 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
|
B31-101 (NC+) - B31-102 (NC-)
| 20 °C (68 °F)
| 560 to 680 Ω
|
Measure the resistance according to the value(s) in the table below.
- Standard resistance (Check for short):
Tester Connection
| Condition
| Specified Condition
|
B31-101 (NC+) - Body ground
| Always
| 10 kΩ or higher
|
B31-102 (NC-) - Body ground
| Always
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
