Note: before starting the test, warm up the automatic transmission fluid to a temperature of 50-80°C.
Range check "D"
Translate the selector to a range "D" and fully depress the accelerator pedal.
1. Check the presence of switches 1->2, 2->3 and 3->4 and the compliance of the switching points with the values given in the table "Switching points".
Note:
- There will be no upshift when the engine coolant temperature is less than 50°C and there is a difference of 10 km/h between the set speed (in a constant speed system (cruise control)) and vehicle speed.
- The torque converter lock-up will not engage when the brake pedal is depressed and the coolant temperature is less than 50°C.
Analysis of results.
A) No switching 1->2:
- defective speed controller.
- switching valve 1->2 is defective.
b) No switching 2->3:
- switching valve 2->3 defective.
V) The switching points do not correspond to those given in the table:
- throttle valve control cable not adjusted,
- faulty throttle valve, changeover valve 1->2, changeover valve 2->3, changeover valve 3->4, etc.
2. In the same way, check the absence of shocks and slipping of the friction controls during shifts 1->2, 2->3 and 3->4. Analysis of results.
If strong shocks are felt during shifting:
- the pressure in the main line is too high,
- faulty accumulator,
- check valve defect.
3. When driving in third or fourth gear, in the range "D", check for abnormal noise or vibration.
Attention: this check should be carried out very carefully, as the appearance of noise and vibration can be caused due to imbalance of the cardan shaft, differential, transformer, etc.
4. Check for forced downshift operation (kick-down), 2->1, 3->2, 4->3 and correspondence of switching torques to the values given in the table "Switching moments.
Analysis of results.
If the downshift speed limits do not match the table, then:
- throttle valve control cable not adjusted,
- faulty throttle valve, changeover valve 1->2, changeover valve 2->3, etc.
5. Check for jolts and slips when forced downshifting.
6. Driving in third gear range "D" at a speed of 60 km / h, release the accelerator pedal and move the selector to the position "L". Determine the speed at which the 2-1 changeover occurred and compare it with the value given in the table "Switching points".
Table. Switching moments.
A140E (3S-FE)
1: at the lowest speed,
2: upshifting prohibited (O/D OFF).
Table. Switching points (ending).
A140L
(): Forced Downshift Switch (kick-down) in the ON position.
A: Torque converter lock-up ON.
B: Torque converter lock-up OFF.
A540N (3S-FE)
A540N (ZS-T)
Checking the operation of the torque converter lock-up
1. When driving overdrive at a steady speed, lockup should occur at about 75 km/h.
2. Lightly press the accelerator pedal: the speed should not change sharply. If there has been a sudden change, there is no blockage.
Range check "2"
Move the selector to position "2", fully depress the accelerator pedal.
1. While driving in second gear range "2" release the throttle pedal and check the engine braking effect. If there is no engine braking, then the engine braking mode brake in second gear is faulty.
2. Check the noise and vibration levels during upshifting and downshifting.
Range check "L"
1. When driving in range "L" there should not be any upshifts - the car should only move in first gear.
2. Load shedding (accelerator pedal release) engine braking should occur. If there is no engine braking, then the first gear brake and reverse gear are faulty.
3. Check the level of noise and vibration when accelerating and decelerating the car.
Range check "R"
Move the selector to position "R", fully depress the accelerator pedal. Check for slippage of the friction controls.
Range check "R"
Park the car on a slope (at least 5°), move the selector to position "R" and release the parking brake. The lock on the output shaft lock mechanism should hold the vehicle in place.