Hyundai Elantra: Automatic Transaxle Control System / Input Speed Sensor Repair procedures

Inspection
1.
Using the GDS, check the input/output speed sensor waveforms.
A.
Turn OFF the ignition switch.
B.
Connect the GDS to the Data Link Connector(DLC) on the lower crash pad.
C.
Ignition "ON" & Engine "ON".
D.
Check the input/output speed sensor waveforms at high speed and low speed.
Fig 1) Input/Output speed sensor at low speed

Fig 2) Input/Output speed sensor at high speed

Removal
1.
Remove the air cleaner assembly and air duct.
(Refer to Engine Mechanical System - "Air cleaner")
2.
Remove the drain plug (A) and drain the ATF totally and then reinstall the drain plug.

   
Replace the gasket before reinstalling the drain plug.
After the installation, start the engine and then check if there are any leakages from the drain plug.
3.
Remove the wiring mounting clip (A).
4.
Disconnect the air breather hose (B) from the valve body cover.

Tightening torque :
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)

5.
Disconnect the hose (A) after removing the automatic transaxle fluid cooler hose clamp.

   
Carefully install the clamp not to damage the hose.
Install the clamp in a correct direction not to be interfered with other parts.
After the installation, start the engine and then check if there are any leakages from the hose.
6.
Disconnect the ATF warmer hose (A).
7.
Remove the mounting bolt of the heater pipe.

   
Carefully install the clamp not to damage the hose.
Install the clamp in a correct direction not to be interfered with other parts.
After the installation, start the engine and then check if there are any leakages from the hose.
8.
Remove the valve body cover (A).

Tightening torque :
11.8 ~ 13.7 N.m (1.2 ~ 1.4 kgf.m, 8.7 ~ 10.1 lb-ft)

   
Replace the gasket (A) before reinstalling the valve body cover.

After the installation, start the engine and then check if there are any leakages from the valve body cover.
9.
Disconnect the oil temperature sensor and solenoid valve connector (A) from the valve body.

Tightening torque :
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)

   
Check for the looseness, poor connection, bending, corrosion, contamination, deterioration, or damage before reinstalling the solenoid valve connector.
10.
Remove the valve body assembly (A).

Tightening torque :
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)

11.
Disconnect the input & output speed sensor connector (A).

12.
Remove the input & output speed sensor (A) after removing the bolts(2ea).

Tightening torque :
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)

Installation
1.
To install, reverse the removal procedure.
2.
Check fluid level after filling the automatic transaxle with fluid.
(Refer to Hydraulic System - "Fluid")
Input Speed Sensor Schematic Diagrams
Circuit Diagram ...

Output Speed Sensor Description and Operation
Description The output speed sensor is a vital unit that measures the rate of rotation of the transaxle's turbine shaft and output shaft, and delivers the readings to the TCM. The sensor prov ...

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