Automatic Transmission/Transaxle: Testing and Inspection

TROUBLESHOOTING

DIAGNOSIS FLOW





INSPECTION CHART FOR TROUBLE SYMPTOMS


















Failsafe
Activation and deactivation of error failsafe is coordinated Error failsafe Management.
Once Error failsafe is activated, it will be kept until ignition key OFF.
In every new TCM start, TCM start with No Error failsafe and No Error present.

0. Mechanical Limp Home Mode
- Switch off A/T relay

1. Electrical Limp Home Mode
- Keep 2nd / 3rd gear

2. Prohibit Intelligent Shift
- Fuzzy SAT(Siements Adaptive Transmission) shift pattern (Medium Driver, Sporty Driver) will not be used

3. Prohibit Adaptive Control
- No learning is done

6. Prohibit Torque Reduction Request
- No torque reduction is sent to ECU

7. Prohibit Lockup Control
- Stay in non-lockup control state

8. Substitute Input Value Oil Temperature
- Set oil temperature(tf) to 80° C (192°F)

9. Substitute Value Speed Ratio
- Set speed ratio to 0.7

10. Substitute CAN Input Value
- Set engine torque to 42�.
- Set throttle position to 50�.
- Set accelerator pedal signal to 50�.
- Set engine speed (Ne) to 3000 rpm
- Set vehicle speed to 0 km/h
- Set status of air condition relay to OFF

11. Prohibit VFS control
- Stop the Line Pressure Control till IG Off

Failsafe according to the DTC

NOTE:
- Refer the detail description in the previous page for the indicated number on the 'Failsafe' column.





SERVICE DATA LIST(WITH SCAN TOOL)





HIVEC -SAT(SIEMENS ADAPTIVE TRANSMISSION CONTROL) Mode (Shift Pattern)





Actuator inspection






ROAD TEST










TORQUE CONVERTER STALL TEST
This test measures the maximum engine speed when the selector lever is in the D or R position. The torque converter stalls to test the operation of the torque converter, starter motor, one-way clutch operation, the holding performance of the clutches, and brakes in the transaxle.

CAUTION:
Do not let anybody stand in front of or behind the vehicle while this test is being carried out

1. Check the automatic transmission fluid level and temperature, and the engine coolant temperature.
A. Fluid level : At the HOT mark on the oil level gauge
B. Fluid temperature : 80 - 100°C (176 - 212°F)
C. Engine coolant temperature : 80 - 100°C(176 - 212°F)
2. Prevent all the wheels from moving during the test.
3. Pull the parking brake lever up, with the brake pedal fully depressed.
4. Start the engine.
5. Move the selector lever to the "D" position, fully depress the accelerator pedal and take a reading of the maximum engine speed at this time.

Stall speed : 2,000 - 2,700rpm

CAUTION:
- The throttle should not be left fully open for any more than five seconds.
- If carrying out the stall test two or more times, move the selector lever to the "N" position and run the engine at 1,000 rpm/min to let the automatic transaxle fluid cool down before carrying out subsequent tests.

6. Move the selector lever to the "R" position and carry out the same test again.

TORQUE CONVERTER STALL TEST CONCLUSION
1. Stall speed is too high in both "D" and "R" ranges
A. Low line pressure
B. Low & reverse brake(B) slippage
2. Stall speed is to high in "D" range only
A. Underdrive clutch(C) slippage
3. Stall speed is too high in "R" range only
A. Reverse clutch(A) slippage
4. Stall speed too low in both "D" and "R" ranges
A. Malfunction of torque converter(D)
B. Insufficient engine output





HYDRAULIC PRESSURE TEST
1. Warm up the engine until the automatic transaxle fluid temperature is 80-100°C.
2. Lift up the vehicle so that the wheels are free to turn.
3. Connect the special tool (oil pressure gauge) to each pressure discharge port.
4. Measure the hydraulic pressure at each port under the conditions given in the standard hydraulic pressure table, and check that the measured values are within the standard value ranges.
5. If a value is outside the standard range, correct the problem while referring to the hydraulic pressure test diagnosis table.












STANDARD HYDRAULIC PRESSURE TEST





** The values are subject to change according to vehicle model or condition
** Depress the acceleration pedal "GENTLY" under no load when measuring the hydraulic pressure.