Special Tool - A/T Tester Operation
Group: SPECIAL SERVICE TOOLSNumber: 94-09-002
Date: APRIL, 1994
Model: ALL
Subject:
AUTOMATIC TRANSAXLE TESTER
GENERAL INFORMATION
The Hyundai Automatic Transaxle Tester offers quick diagnosis and troubleshooting of the automatic transaxle. The tester takes the place of the transaxle control unit, allowing the transaxle to be shifted manually. This will help the technician determine if internal or external transaxle service is required.
INSTALLATION PROCEDURES:
NOTE:
Please read the yellow caution label on the back of tester before installing . Do not use the MUT at the same time as the Transaxle Tester. The MUT will not allow the Transaxle Tester to operate correctly.
Prior to connecting the transaxle tester:
A. Check the transaxle fluid level and correct if necessary.
B. Connect the MUT and check for any trouble codes. If any codes are present, correct them before using the Transaxle Tester. The transaxle will activate failure codes during testing.
C. If the transaxle still does not shift properly, the Transaxle Tester should be connected between the transaxle solenoid valve connector and the transaxle control unit (TCU).
The following tests can be made to check the transaxle operation:
1. Automatic Shift Test: Place the transaxle shift lever in "D" for the entire test. Move the transaxle Tester GEAR SELECTOR switch to NORMAL position. Drive the car and observe that the indicator lights are activated at the proper intervals.
2. Manual Shift Test: Place the transaxle shift lever in "D" for the entire test. With the vehicle stopped and your foot on the brake, move the GEAR SELECTOR switch to the 1st gear position. Shift the transaxle manually through the gears while driving by using the GEAR SELECTOR switch on the Transaxle Tester. Check to see that the shifts are normal without slipping or harshness. Shifts while driving should be made at the speeds noted below.
1-2 15 MPH
2-3 25 MPH
3-4 35 MPH
A harsh shift may occur if the gears are selected at higher speeds than recommended. This is caused by the PCSV not bleeding full line pressure down during the shift. The PCSV duty cycle is over-ridden by the tester.
CAUTION:
If selector is moved manually from a higher gear to a lower gear (4th to 1st) at any speed, the transaxle will shift down abruptly.
If abnormal shifts are felt, it could indicate that the active dutch or band element in use requires adjustment or repair.
NOTE:
At the completion of this test , the transaxle will be in the fail-safe mode (3rd gear). This is normal.
PCSV duty cycle is over-ridden by the tester.
CAUTION:
If selector is moved manually from a higher gear to a lower gear (4th to 1st) at any speed, the transaxle will shift down abruptly.
If abnormal shifts are felt, it could indicate that the active dutch or band element in use requires adjustment or repair.
NOTE:
At the completion of this test , the transaxle will be in the fail-safe mode (3rd gear). This is normal.
3. Damper Clutch Operation Test: with the Transaxle Tester connected, the GEAR SELECTOR switch set on normal and the transaxle shift lever in "D" at 25 MPH, switch the damper clutch switch on the Transaxle Tester on and off to check the operation of the damper clutch. The damper clutch operation can be felt while operating the switch. If the damper clutch cannot be felt engaging and disengaging, the torque converter or damper clutch control solenoid or the associated control wiring might require service. To verify suspect damper clutch operation, engage the damper dutch with the engine at idle, and the engine will stall.
4. Stall Test: Place the transaxle shift lever in "D" for the entire test. With the transaxle Tester connected and the engine running, place the GEAR SELECTOR switch on the Transaxle Tester in each gear position (1-4) and perform a stall test. Depending on the vehicle, make sure the stall RPM is above the specification. If the stall RPM is too low, check for low engine power or defective torque converter operation.
NOTE:
At the completion of this test, the transaxle will not be in the fail-safe mode.
5. Voltage Tests: Below the indicator lights on the face of the Transaxle Tester are voltage taps to check apply voltages that the transaxle control unit (TCU) sends to each component. Using a high impedance voltmeter (DVOM) connected between the ground tap and the desired component tap on the face of the Transaxle Tester, check the apply voltage.
NOTE:
The Transaxle Control Unit supplies voltage, not ground, to the component for operation.
If any of the voltage readings are not within specification, the wiring from the Transaxle Control Unit (TCU) to the component or the Transaxle Control Unit itself, should be checked.
OPERATION NOTES:
1. After manually shifting the transaxle with the Transaxle Tester, the transaxle will operate in the fail-safe mode (3rd gear). By stopping the vehicle and turning the Transaxle Tester Gear Selector switch to "Normal" and then turning the ignition switch off, the fail-safe mode will be erased from memory. Individual codes must be erased using the MUT or by disconnecting the battery.
2. The Transaxle Tester takes the place of the Transaxle Control Unit (TCU) during testing.
3. If the transaxle operates normally when manually shifting through the gears using the Transaxle Tester, the transaxle does not have an internal malfunction.
NOTE:
Higher pressure due to the lack of PCSV operation may cause shift flares not to occur during testing that may occur under normal operation.
4. If the transaxle does not shift normally when manually shifting through the gears using the transaxle tester, the transaxle requires internal service.
5. Do not use the MUT at the same time the Transaxle Tester is being used.
MULTI-USE TESTER APPLICATION:
1. The MUT will only check the following transaxle electrical system components:
^ Pulse Generator A & B
^ Throttle Position Sensor
^ Automatic Transaxle oil Temperature Sensor Kick-down Switch
^ Ignition Coil
^ Accelerator Switch
^ Vehicle Speed Sensor
^ Inhibitor Switch (Gear Position)
^ Overdrive Switch
^ Power/Normal/Economy Switch
^ A/C Relay
^ Pressure Control Solenoid Valve (PCSV)
^ Damper Clutch Control Solenoid Valve (DCCSV)
2. The MUT will not test the clutches, brakes, valves in the valve body, slipping between or in gear, leaks or noises.
3. The Transaxle Tester will check for defective shifting caused by:
^ Low oil pressure
^ Worn clutch or brakes
^ Valves sticking in the valve body
^ Electrical problems outside the transaxle