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 printable version
Diagnosing failures AT / CVT - the general information
AT Failures often occur on one of the following five reasons:
a) reducing the efficiency of return of the engine;
b) Violation of the regulations;
c) Any defect hydraulics;
d) Mechanical damage;
e) refusing onboard processor / her signal chain.
Diagnosis of failures must always start with the most simple checks: estimate level and condition ATF (see chap. Adjustment and routine maintenance), check the adjustment of the drive gear and the throttle. Next, perform sea trials of a vehicle in order to determine the effectiveness of patching. If the problem persists, the car should be driven away on a car repair shop for more detailed diagnostics with the use of special equipment. A description of some of the symptoms of failure of AT given in the section on fault diagnosis, parts and systems of the car at the beginning of this manual.
Initial inspection
| 1. During the short trip transmission warm to normal operating temperature.
2. Check the ATF (see chap. Adjustment and routine maintenance):
a) If the fluid is not enough, make corresponding updating, having added necessary quantity fresh ATF. Make sure that the adjustment from the measuring probe, and then check the transmission for signs of external leaks (see below).
b) If the level was too high, drain the excess ATF, then check it for signs of the presence of coolant, indicating the tightness of internal partitions of the radiator separating its heat exchanger from lateral tanks with ATF (see chap. System of cooling, heating);
c) If the ATF foamed, empty transmission and fill it with fresh liquid - fused ATF check for traces of coolant.
3. Check the engine idling speed (see chap. The power supply system and release). If necessary, drive to a repair shop to make the appropriate adjustments.  | If the engine is not in order, you should not start performance of primary checks of transmission until until corrected accordingly. |
4. Check the freedom of movement of the control cable driven gear (see. Section Check, adjustment and replacement of a cable of a gear change), make sure the correct alignment with the smooth progress of traction. |
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Diagnostics of leaks ATF
general information
Most leaks are easy to detect a visual inspection. Repair usually consists of replacing the corresponding defective gland or gasket. If you identify the source of the leak in the external examination fails, proceed as described below.
The first step is to eliminate the possibility of errors in determining the nature of the leak. Not to be confused with the ATF motor oil or brake fluid (transmission fluid typically has a dark red color).
To identify the source of the leak Take a short (several kilometers) a trip, then park the vehicle spread out over a blank sheet of cardboard. A few minutes later the source of the leak can be detected in the footsteps of the liquid dripping on a cardboard.
Inspect the suspected site and the surrounding surface, paying particular attention to the joints mating gasket surfaces. In order to expand the viewing angle, use a handheld mirror.
If you identify the source of the leak is still not possible to thoroughly clean the suspected area with a cloth moistened with solvent, and then dry it.
Take another short trip, this time often changing speed, then re-examine the cleaned suspected site.
After identifying the source of the leak, identify and eliminate the cause of its development, and only then proceed to the necessary restoration work. Replace damaged gasket will not lead to the desired result, if left unrepaired defect mating surface, which led to the exit seal failure. Thus, the deformed flange must be aligned.
The following subsections are the most common causes of leaks ATF and conditions which must be met, to avoid recurrence.
| Some of these requirements can not be met without the use of special equipment. In this case, the car should be driven away on a car repair shop. |
Leakage through the sealing surface
Periodically inspect the sump of the transmission. Check availability at our place, and reliability of a tightening of fixing bolts, make sure that the cover does not appear traces of mechanical damage (deformation of the pallet can lead to failure of the transmission located inside the valve assembly).
Among the possible causes of leakage tray are too tight tightening fixing bolts, damage to the sealing surface of transmission case, the destruction of dams, as well as the occurrence of cracks or porosity of the walls of the housing. If the lining of the pallet or the transmission housing is formed pillow sealant, there is a possibility of wrong choice of the type of the latter. Leakage through the lining of the pallet can also cause transmission fluid sump overflow or pressure rise ATF.
Leakage through seals and cuffs
Among the most common causes of output transmission seals fail are excessively high level ATF, infringement of cross ventilation pipe, mechanical damage to the walls of a landing slot, damage to the gland itself, or improper installation of the latter. There is also the likelihood of damage to the threaded stud in the shaft seal or excessive backlash due to wear of the last bearing.
Check the condition and correct seating of the seal guide tube probe. Periodically inspect for signs of leaks in the area of the surface of the drive gear speedometer / speed sensor (VSS). If necessary to replace the O-ring.
Leakage through defects in the walls of the transmission housing
The reason of development of leaks ATF may be cracks or pores in the body of transmission case. Consult your service specialist.
Check tightness of hose connections choke assemblies cooler ATF.
Leaks through the breather and filler neck
Leaks through the breather ventilation or filler neck may be due to the overflow of transmission, contact with ATF coolant impaired patency of the breather / vent pipe or the return of the drainage holes.
DTCs AT
AT is responsible for the on-board processor continually monitors violations taking place in the system (including the contours of information sensors and actuators). When detecting a fault in the memory of the control unit shall be stored diagnostic code. At the service station listed in the memory of the processor fault codes can be extracted using a device known as "CONSULT", a reader scanner type. Car owner can make code reading on their own, using the signals displayed warning lamp disable upshift "OD OFF" on the dashboard of the car.
Models 1993 and 1994 Vol.
| 1. Start the engine and warm it up to normal operating temperature.
2. Turn the ignition switch OFF.
3. Turn the mode selector AT operation to AUTO.
4. Set the mode switch overdrive switch to ON.
5. Move the selector lever to position "P".
6. Without starting the engine, turn the ignition.
7. The control lamp OD OFF should join approximately two seconds:
a) Refusal turn on the lamp indicates a malfunction of the control processor operation of the AT (first make sure that it is not out of order lamp itself). Composers of the present Management do not recommend to measure resistance and voltage by the processor, as random surges / transmission control unit through an excessively high current can withdraw the last of the system. Drive away the car to check the workshop.
b) If the warning lamp OD OFF works correctly, proceed to the next stage of testing.
8. Turn the ignition off.
9. Turn the selector lever to "D".
10. Turn off the overdrive by turning the mode switch to OFF.
11. Without starting the engine, turn the ignition.
12. After more than two seconds after the ignition move the selector lever to position "2".
13. Turn the switch to ON, activate overdrive.
14. Move the selector lever to position "1".
15. Turn off raising transfer (OFF).
16. Depress the pedal to the metal, and then release it.
17. Now the processor must switch to release the information. Reading the memorized unit fault codes can be produced by glimpses of a control lamp OD OFF. |
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Models from 1995 to 1997 Vol.
| 1. Start the engine and warm it up to normal operating temperature.
2. Turn off the ignition and before proceeding with the procedure, wait a minimum of five seconds.
3. Turn the ignition key to the ACC
4. Set the mode switch overdrive switch to ON.
5. Move the selector lever to position "P".
6. Without starting the engine, turn the ignition.
7. The control lamp OD OFF should join approximately two seconds:
a) Refusal turn on the lamp indicates a malfunction of the control processor operation of the AT (first make sure that it is not out of order lamp itself). Composers of the present Management do not recommend to measure resistance and voltage by the processor, as random surges / transmission control unit through an excessively high current can withdraw the last of the system. Drive away the car to check the workshop.
b) If the warning lamp OD OFF works correctly, proceed to the next stage of testing.
8. Turn the ignition off.
9. Once again turn on the ignition without starting the engine.
10. Move the selector lever to "D".
11. Turn off the overdrive by turning the mode switch to OFF.
12. Without starting the engine, turn the ignition.
13. After more than two seconds after the ignition move the selector lever to position "2".
14. Turn the switch to ON, activate overdrive.
15. Move the selector lever to position "1".
16. Turn off raising transfer (OFF).
17. Depress the pedal to the metal, and then release it.
18. Now the processor must switch to release the information. Reading the memorized unit fault codes can be produced by glimpses of a control lamp OD OFF. |
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Models 1998 and 1999 Vol.
| 1. Start the engine and warm it up to normal operating temperature.
2. Turn off the ignition and before proceeding with the procedure, wait a minimum of five seconds.
3. Turn the mode selector AT operation to "P".
4. Do not start the engine switch on the ignition.
5. Control lamp OD OFF should join approximately two seconds:
a) Refusal turn on the lamp indicates a malfunction of the control processor operation of the AT (first make sure that it is not out of order lamp itself). Composers of the present Management do not recommend to measure resistance and voltage by the processor, as random surges / transmission control unit through an excessively high current can withdraw the last of the system. Drive away the car to check the workshop.
b) If the warning lamp OD OFF works correctly, proceed to the next stage of testing.
6. Turn the ignition off.
7. Turn the ignition key to the ACC.
8. Turn the selector lever to "D".
9. Without starting the engine, turn the ignition.
10. Turn off raising transfer (Depress the button to switch to OFF), turn the ignition off and then on again. Release the switch of raising transfer (the lamp should go out).
11. After more than two seconds after the ignition move the selector lever to position "2".
12. Dip Switch overdrive button and hold it down, move the selector lever in position "1".
13. Turn off the overdrive (the lamp should go out).
14. Depress the pedal to the metal, and then release it.
15. Now the processor must switch to release the information. Reading the memorized unit fault codes can be produced by glimpses of a control lamp OD OFF. |
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All models
| 1. If all circuits are functioning properly monitored, the control lamp will give a glimpse of one long, then ten short at equal intervals between them.
2. Start counting highlight each of the codes marked by one long blink, followed by another period of ten successive flashes, determine the proper number of code:
a) If the first glimpse of the ten most significant is long, therefore, there is a fault in the circuit speed sensor;
b) The length of the second means giving a glimpse of the circuit VSS;
c) The third glimpse of a long chain corresponds to a denial of TPS;
d) The fourth - in the chain of shift solenoid A 4
e) The fifth - in the chain of shift solenoid B;
f) The sixth - in solenoid circuit switch freewheel;
g) The seventh - in solenoid circuit-switch coupling of the converter of rotation;
h) The eighth - in temperature sensor circuit ATF;
i) The ninth - in the engine speed signal circuit;
j) Tenth - in pressure solenoid circuit path;
k) The alternation of long flashes with long eclipses warning lamp indicates low battery;
l) On Model 1998 Vol. failure on the control lamp OD OFF evidence of infringement of serviceability of functioning of the gauge-switch of the permission of start / reversing lights, switch overdrive or TPS;
m) On models 1999 Vol. turn on the lamp failure is usually due to failure of the gauge-switch of the permission of start / reversing lights, or TPS.
3. Eliminating identified during the audit faults requires highly skilled artist and should be entrusted to experts of car-care center. The only exception is the repair / replacement and VSS TPS (see chap. Engine management). |
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Clear memory of the processor codes
| 1. Clean the processor memory is one of the repair procedures performed by specialists of the service station. If the code reading and the necessary corrections made by the owner of the car by yourself, do the following:
2. Turn off the ignition (if enabled) Wait at least five seconds and turn it on again.
3. Follow the procedures read fault codes (See above.).
4. Turn the selector control module (PCM), switch the system mode Mode II Mode Mode I (see chap. Engine management). |
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