Note: The failure of an automatic transmission can be caused by five main causes of poor engine performance - improper adjustment, failure of the hydraulic system, mechanical problems, or computer and network failures. Diagnostics should begin with checking the fluid level and its condition (see chapter 1), adjusting the switch mechanism and throttle mechanism. Then spend "route" testing to determine if the problem is correctly identified and whether further diagnostics are needed.
Preliminary check
1. Warm up the gearbox to normal operating temperature.
2. Check fluid level as instructed in chapter 1.
A) if the fluid level is too low, add as much as needed, then check for external leaks (see below);
b) if the fluid level is too high, drain the excess, then check the drained fluid for contamination with coolant. If there is coolant from the engine in the automatic transmission fluid, then the walls of the internal radiator that separates the transmission fluid from the coolant are damaged;
V) if the fluid foams, drain it and refill the box, then check the presence of coolant in the transmission fluid and its level.
3. Check engine idle speed.
Note: do not start testing with a faulty engine - first repair it and achieve normal operation.
4. Check how freely the throttle cable cable moves. Adjust if necessary (section 6).
Note: The throttle cable may work normally when the engine is off and cool, and fail when the engine is hot. Therefore, check it with a cold and normally warm engine.
5. Check drive control mechanism (section 5). Make sure it is properly adjusted and the mechanism runs smoothly.
Fluid Leak Diagnosis
6. Most fluid leaks are easy to recognize visually: the repair in this case is to replace the seal or gasket.
Gasket leaks
7. Periodically check the sump Make sure all the bolts are in place and tight, the gaskets are in good condition, the sump is flat.
8. Pan gasket leakage can result from too high fluid level or pressure, obstructed vents, overtightening pan bolts, torn pan seal edges, damage to the seal surface or body of the box itself, damage to the gasket itself, cracks or defects in the castings of the box itself.
Seal leaks
9. If the gearbox seal is leaking, the cause may be too high fluid level or pressure, clogged vent holes, damaged seal bore, damage or improper installation of the seal itself, damaged shaft surface passing through the seal, and a loose bearing.
10. Check that the dipstick tube seal is in good condition tube is installed correctly. Periodically check the area around the speedometer outlet for leaks. If there is fluid from the transmission, check the integrity of the sealing ring. Also check the side gear shaft oil seals for leaks.
Hull leaks
11. If the housing itself is leaking, replace it.
12. Make sure the oil cooler hose ends are tight and in good condition.
Fluid is leaking from the vent tube or fill pipe
13. Possible reasons: the box is full of fluid, there is coolant in the transmission fluid, the dipstick is not working properly, the vent or drain holes are clogged.
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