Troubleshooting
TROUBLESHOOTING
1. GENERAL INFORMATION
a. Troubles occurring with the automatic transaxle can be caused by either the engine or the transaxle itself. These 2 areas should be checked before proceeding with troubleshooting.
b. Troubleshooting should begin with the simplest operation, working up in order of difficulty degree but first determine whether the trouble lies within the engine or the transaxle.
c. Proceed with the inspection as follows:
2. PRELIMINARY CHECK
a. Check the fluid level.
HINT:
^ Drive the vehicle so that the engine and the transaxle are at normal operating temperature.
ATF temperature: 70 - 80°C (158 - 176°F)
^ Only use the COOL range on the dipstick as a rough reference when the fluid is replaced or the engine does not run.
1. Park the vehicle on the level surface and set the parking brake.
2. With the engine idling and the brake pedal depressed, shift the shift lever into all positions from the P to L position and return to the P position.
3. Pull out the oil level gauge and wipe it clean.
4. Push it back fully into the pipe.
5. Pull it out and check that the fluid level is in the HOT range. If the amount of ATF is less than the range, add the new ATF.
Fluid type: ATF D-II or DEXRON(R)III (DEXRON(R)II)
NOTICE: Do not overfill.
b. Check the fluid condition.
If the fluid smells burnt or is black, replace it.
c. Replace the ATF.
1. Using a hexagon wrench, remove the drain plug and drain the ATF.
2. Using a hexagon wrench, install the drain plug securely.
3. Add new ATF through the filler pipe.
Fluid type: ATF D-II or DEXRON(R)III (DEXRON(R)II)
Drain and refill: 2.5 liters (2.6 US qts, 2.2 Imp. qts)
4. Start the engine and shift the selector into all positions from the P position through the L position and then shift it into the P position.
5. With the engine idling, check the fluid level. Add the fluid up to the COOL level on the dipstick.
6. Check the fluid level with the normal operating temperature 70 - 80°C (158 - 176°F) and add as necessary.
NOTICE: Do not overfill.
d. If necessary, replace the differential fluid.
1. Using a hexagon wrench, remove the drain plug and drain the fluid.
2. Using a hexagon wrench, install the drain plug securely.
3. Remove the filler plug.
4. Add new fluid until it begins to run out of the filler holes.
Fluid type: ATF D-II or DEXRON(R)III (DEXRON(R)II)
e. Check the differential fluid level.
Remove the filler plug and check the differential fluid level.
f. Inspect and adjust the throttle cable.
1. Fully depress the accelerator pedal and check that the throttle valve opens fully.
HINT: If the throttle valve does not open fully, adjust the accelerator link.
2. Fully depress the accelerator.
3. Loosen the adjustment nuts.
4. Adjust the outer cable so that the distance between the end of the boot and the stopper on the cable is the standard.
Standard boot and cable stopper distance: 0 - 1 mm (0 - 0.04 inch)
5. Tighten the adjusting nuts.
6. Recheck the adjustment.
g. Inspect the park/neutral position switch.
1. Remove the park/neutral position switch.
2. Using an ohmmeter, check continuity between each terminal shown when the shift lever is put in each position.
h. Adjust the shift control cable.
1. Remove the engine under cover.
2. Loosen the nut on the control shaft lever.
3. Push the control shaft lever fully toward the right side of the vehicle.
4. Return the lever 2 notches to the NEUTRAL position.
5. Set the shift lever to the N position.
6. While holding the lever lightly toward the "R" position sires tighten the swivel not.
3. MEASURE STALL TEST
The object of this test is to check the overall performance of the transaxle and the engine by measuring the maximum engine speeds in the D and R positions.
NOTICE:
^ Do the test at normal operating ATF temperature 50 - 80°C (122 - 176°F).
^ Do not continuously run this test longer than 5 seconds.
1. Chock the 4 wheels.
2. Fully apply the parking brake.
3. Connect the OBD II scan tool or the TOYOTA hand-held tester to the DLC3.
4. Start the engine and check the idle speed.
5. Keep your left foot pressed firmly on the brake pedal.
6. Shift it into the D position. Fully depress the accelerator pedal. Quickly read the highest engine RPM at this time.
Stall speed: 2,500 ± 150 rpm
7. Do the same test in the R position.
EVALUATION
4. MEASURE TIME LAG TEST
When the shift lever is shifted while the engine is idling, there will be a certain time of lapse or lag before the shock can be felt. This is used for checking the condition of the forward clutch, direct clutch and 1st and reverse brake.
NOTICE:
^ Do the test at normal operating ATF temperature 50 - 80°C (122 - 176°F).
^ Make sure to allow 1 minute interval between the tests.
^ Perform the measurement 3 times and take the average value.
1. Fully apply the parking brake.
2. Connect the OBD II scan tool or the TOYOTA hand-held tester to the DLC3.
3. Start the engine and check the idle speed.
Idling speed: 700 ± 50 rpm (In N position and A/C OFF)
4. Shift the shift lever from the N to D position. Using a stop watch, measure now long it takes from shifting the lever to the shock is felt.
Time lag: Less than 1.2 seconds
5. In the same way, measure the time lag for N -> R.
Time lag: Less than 1.5 seconds
EVALUATION (If N -> D or N -> R time lag are longer than specified)
5. HYDRAULIC TEST
a. Measure the line pressure.
1. Warm up the ATF.
2. Remove the transaxle case test plug and mount SST.
SST 09992-00095 (09992-00151, 09992-00271)
NOTICE:
^ Do the test at normal operating ATF temperature 50 - 80°C (122 - 176°F).
^ Check that the throttle cable is adjusted within the specifications.
^ Check that the tire pressures are adjusted according to the specifications.
3. Chock the 4 wheels.
4. Fully apply the parking brake.
5. Start the engine and check the idle speed.
6. Keep your left foot pressed firmly on the brake pedal and shift into the D position.
7. Measure the line pressure when the engine is idling.
8. Fully depress the accelerator pedal. Quickly read the highest line pressure when the engine speed reaches the stall speed.
NOTICE: Release the accelerator pedal and stop the test if the wheels begin to rotate before the engine speed reaches the specified stall speed.
9. In the same way, do the test in the R position.
Specified line pressure
10. If the measured pressures are not up to specified values, recheck the throttle cable adjustment and retest it.
EVALUATION
b. Measure the governor pressure.
1. Warm up the ATF.
2. Remove the transaxle case test plug and mount SST.
SST 09992-00095 (09992-00231, 09992-00271)
NOTICE:
^ Do the test at normal operating ATF temperature 50 - 80°C (122 - 176°F).
^ Check that the throttle cable is adjusted within the specifications.
^ Check that the tire pressures are adjusted according to the specifications.
3. Check the parking brake to see that it is not applied.
4. Start the engine.
5. Shift into the D position and measure the governor pressures at the speeds specified in the table.
EVALUATION
6. ROAD TEST
NOTICE: Do this test at normal operating ATF temperature 50 - 80°C (122 - 176°F).
a. D position test.
Shift into the D position and while driving with the accelerator pedal depressed constant at the throttle valve fully open, check on the following points:
1. 1 -> 2, 2 -> 3 up-shifts should take place, and shift points should conform to those shown in the automatic shift schedule.
EVALUATION
2. In the same way, check the shock and slip at 1 -> 2 and 2 -> 3 up-shifts.
EVALUATION
3. Run in the 3rd gear of the D position, check the abnormal noise and vibration.
HINT: Check for the cause of abnormal noise and vibration must be made with extreme care as they could also be due to imbalance in the drive shaft, differential, tires torque converter clutch, etc.
4. While running in the 3rd gear of the D position, check that the possible kick-down vehicle speed limits for the 3 -> 1 and 3 -> 2 kick-down conform to those indicated in the automatic shift schedule.
EVALUATION
5. Check the abnormal shock and slip at kick-down.
6. While running about 60 km/h (37 mph) in the 3rd gear of the D position, release your foot from the accelerator pedal and shift into the L position. Then check if the 2 - 1 down-shift point conform to those indicated in the automatic shift schedule.
b. Inspect the lock-up mechanism.
1. Drive in the D position at a steady speed (Lock-up ON) of about 80 km/h (50 mph).
2. Lightly depress the accelerator pedal and check that the engine speed does not change abruptly. If there is a big jump in engine RPM, there is no lock-up.
c. 2 position test.
1. While running in the 2nd gear of the 2 position, 2nd gear, release the accelerator pedal and check the engine braking effect.
EVALUATION
2. Check the abnormal noise during acceleration and deceleration.
3. Check the shock during up-shift and down-shift.
d. L position test.
1. While running in the L position, check that there is no upshift to 2nd gear.
2. While running in the L position, release the accelerator pedal and check the engine braking effect.
EVALUATION
3. Check for abnormal noise during acceleration and deceleration.
e. R position test.
Shift into the R position and, while running at full throttle, check for slipping.
f. P position test.
Stop the vehicle on a gradient (more than 5°) and, after shifting into the P position, release the parking brake. Then check that the parking lock pawl prevents the vehicle from moving.