Initial Inspection and Diagnostic Overview
FLUID LEAKAGEIf the governor cap is suspected:
1. Open hood.
2. Remove snap retainer, governor cap and seal ring, then reinstall them. Refer to ON-VEHICLE SERVICE. Service and Repair
3. Clean the area around the governor cap.
4. Run the vehicle at highway speeds.
5. Check the governor cap for fresh leakage.
To detect a fluid leak:
1. Raise vehicle.
2. Clean area suspected of leaking.
3. Start engine, apply foot brake, place shift control lever in drive, and wait a few minutes.
4. Stop engine.
5. Check for fresh leakage.
FLUID CONDITION
Examine the A.T.F. and note its color, texture, and odor.
1. Dark or Black Fluid with a burned odor:
- Worn friction material.
2. Milky Pink Fluid: Water Contamination
- Road water entering through filler tube or breather.
3. Varnished Fluid, light to dark brown and tacky: Oxidation
- Over or Underfilling.
- Overheating.
Perform road tests using "Symptom" chart, as follows:
"P" RANGE
1. Place shift control lever in "P" range and start the engine. Stop the engine and repeat the procedure in all other ranges including neutral.
2. Stop vehicle on a slight upgrade and place selector lever in "P" range. Release parking brake to make sure vehicle remains locked.
"R" RANGE
1. Manually shift the selector lever from "P" to "R", and note shift quality.
2. Drive the vehicle in reverse long enough to detect slippage or other abnormalities.
"N" RANGE
1. Manually shift the selector lever from "R" and "D" to "N" and note quality.
2. Release parking brake with selector lever in "N" range. Lightly depress accelerator pedal to make sure vehicle does not move. (When vehicle is new or soon after clutches have been replaced, vehicle may move slightly. This is not a problem.)
"D" RANGE
1. Manually shift the selector lever from "N" to "D" range, and note shift quality.
2. Using the shift schedule as a reference, drive vehicle in "D" range. Record, on symptom chart, respective vehicle speeds at which up-shifting and down-shifting occur. These speeds are to be read at three different throttle positions (light, half and full), respectively. Also determine the timing at which shocks are encountered during shifting and which clutches are engaged.
3. Determine, by observing lock-up pressure, whether lock-up properly occurs while driving vehicle in "D3" and "D4" ranges. (Refer to Pressure Testing).
4. Check to determine if shifting to overdrive gear cannot be made while O.D. control switch is "OFF".
5. When vehicle is being driven in the 65 to 80 km/h (40 to 50 MPH) range in "D3" at half to light throttle position, fully depress accelerator pedal to make sure the transmission downshifts from 3rd to 2nd gear.
6. When vehicle is being driven in the 25 to 35 km/h (16 to 22 MPH) ("D2" range) at half to light throttle position, fully depress accelerator pedal to make sure the transmission downshifts from 2nd to 1st gear.
"2" RANGE
1. Shift to "2" range and check to make sure that vehicle starts to move in 1st gear.
2. Increase vehicle speed to make sure it upshifts from 1st to 2nd gear.
3. Further increase vehicle speed. Make sure it does not upshift to 3rd gear.
4. While driving vehicle at 25 to 35 km/h (16 to 22 MPH) with throttle at half to light position ("22 " range), fully depress accelerator pedal to make sure it downshifts from 2nd to 1st gear.
5. Allow vehicle to run at idle while in 2nd gear to make sure that it downshifts to 1st gear.
6. Shift control lever to "D" range and allow vehicle to operate at 40 to 50 km/h (25 to 31 MPH). Then, shift to "2" range to make sure it downshifts to 2nd gear.
"1" RANGE
1. Shift selector lever into "1" range and accelerate vehicle. Ensure that it does not upshift from 2nd to 3rd gear although vehicle speed increases.
2. While vehicle is being driven in "1" range, release accelerator pedal to make sure that engine compression acts as a brake.
3. Shift selector lever into "D" or "2" range and allow vehicle to run at 20 to 30 km/h (12 to 19 MPH). Then, shift selector lever to "1" range to make sure the downshift to 1st gear is made.
ROAD TEST SYMPTOM CHART
Trouble-shooting Chart Part 1:
Trouble-shooting Chart Part 2:
Trouble-shooting Chart Part 3:
TROUBLE-SHOOTING CHART
VEHICLE SPEED AND LINE PRESSURE WHEN SHIFTING GEARS
This check should be carried out when oil temperature is between 43 to 57 °C (109 to 135 °F).
SHIFT SCHEDULE
LINE PRESSURE
1. Install pressure gauge to line pressure port. Locate the gauge so it can be seen by driver.
2. Warm up engine until engine oil and A.T.F. reach operating temperatures.
A.T.F. temperature: 43 - 57 °C (109 - 135 °F)
3. Measure line pressure at idle and at stall point while depressing brake pedal fully.
At Idling
At stall test
- Do not perform tests for more than five seconds at any shift range.
- Do not proceed to next "range" test immediately after one "range" test is done. Wait until oil temperature decreases.
Judgment by line pressure
1. When line pressure while idling is low at all positions ("D", "2", "1", "R" and "P"), the problem may be due to:
- Wear on interior of oil pump
- Oil leakage at or around oil pump, control valve body, transmission case or governor
- Sticking pressure regulator valve
- Sticking pressure modifier valve
2. When line pressure while idling is low at a particular position, the problem may be due to the following:
- If oil leaks at or around forward clutch (rear) or governor, line pressure is low in "D" or "1" range but is normal in "R" range.
- If oil leaks at or around low and reverse brake circuit, line pressure becomes low in "R" or "P" range but is normal in "D", "2" or "1 range.
3. When line pressure is high while idling, pressure regulator valve may have stuck.
If line pressure does not rise, first check to make sure that throttle wire is connected properly.
LOCK-UP TEST
Install pressure gauge to port. Shift selector lever in "D" range.
If lock-up pressure is not within specifications, refer to Trouble-shooting chart (A6).
STALL TESTING
The stall test is an effective method of testing clutch and band holding ability, torque converter one-way clutch operation, and engine performance. A stall test should only be performed as a last resort because of the high fluid temperature it generates and the excessive load it places on the engine and transaxle.
CAUTION:
a. Transaxle and engine fluid levels should always be checked and fluid added as needed.
b. Run engine at 1,200 rpm to attain proper warm-up.
c. During test, never hold throttle wide-open for more than 5 seconds.
d. Do not test more than two gear ranges without driving vehicle to cool off engine and transaxle.
STALL TEST PROCEDURE
1. Set parking brake and block wheels.
2. Install a tachometer where it can be seen by driver during test.
3. Start engine and place selector lever in "D" range.
4. Apply foot brake and accelerate to wide-open throttle.
5. Quickly note the engine stall speed and immediately release throttle.
Stall revolution: 2,000 - 2,300 rpm
6. Shift selector lever to "N".
7. Cool off transaxle fluid.
8. Perform stall tests in the same manner as in steps 3 through 7 with selector lever in "1" and "R", respectively.
Stall Test Analysis:
STALL TEST ANALYSIS