On-Vehicle Inspection
MECHANICAL SYSTEM TEST [LA4A-EL]Mechanical System Test Preparation
1. Apply the parking brake and use wheel chocks at the front and rear of the wheels.
2. Inspect the engine coolant.
3. Inspect the engine oil.
4. Inspect the ATF levels.
5. Inspect the ignition timing.
6. Inspect the idle speed.
Line Pressure Test
This test measures line pressure as a means of checking the hydraulic components and inspecting for oil leakage.
1. Engine idling.
1. Perform mechanical system test preparation.
Warning Removing the inspection port bolt when the ATF is hot can be dangerous. Hot ATF could come out of the opening and badly burn. Before removing the inspection port bolt allow the ATF to cool.
2. Remove the inspection port bolt shown in the figure.
3. Connect the SSTs (49 UN01 1 28, 49 B019 901, and 49 B019 903) to the line pressure inspection port.
4. Start the engine.
5. While depressing the brake pedal, move the selector lever to each range position and record line pressure at engine idle.
6. Compare pressure values recorded to values specified in following table.
7. Turn the engine off.
Specification
2. Engine stall speed.
Caution Perform the Line Pressure Test at engine idling prior to performing the test at engine stall. If line pressure is low at idle, do not perform the test at engine stall or further transaxle damage will occur.
1. Replace the SST (49 B019 901) to the SST (49 B019 902).
2. Start the engine.
3. Shift the selector lever to R position.
Caution Do not maintain WOT in any gear range for more than 5 seconds or transaxle damage will occur.
4. Firmly depress the foot brake with the left foot, and gently depress the accelerator pedal to floor Wide Open Throttle (WOT) with the right foot.
5. When the engine speed no longer increases, record line pressure and release the accelerator.
6. Shift the selector to N position and let the engine idle for 1 minute or more to cool the ATF.
7. Perform stall tests for the remaining ranges in the same manner.
(1)D range
(2) 2 range
(3) 1 range
8. Compare results with line pressure specifications in table.
Specification
9. Shift the selector lever to P position.
10. Turn off the engine.
11. Remove the SSTs and install a new square head plug in the inspection port.
Tightening torque
23 - 25 Nm (2.3 - 2.6 kgf.m, 17 - 18 ft. lbs.)
Evaluation of line pressure test
Stall Speed Test
This test is performed to determine if there is slippage at the friction elements or malfunction of the hydraulic components.
Caution Perform the Line Pressure Test at engine idling prior to performing the test at engine stall. If line pressure is low at idle, do not perform the test at engine stall or further transaxle damage will occur.
1. Perform mechanical system test preparation.
2. Connect a tachometer.
3. Start the engine.
4. Shift the selector lever to D range.
Caution
- Do not maintain WOT in any gear range for more than 5 seconds or transaxle damage will occur.
- If engine speed recorded by the tachometer exceeds maximum specified rpm, release accelerator pedal immediately. Clutch or band slippage is indicator.
5. Firmly depress the brake pedal with the left foot, and then gradually depress the accelerator pedal to floor Wide Open Throttle (WOT) with the right.
6. When the engine speed no longer increases, quickly read the engine speed and release the accelerator.
7. Shift the selector to N position and let the engine idle for 1 minute or more to cool the ATF.
8. Perform a stall test of R position in the same manner.
Engine stall speed
2,000 - 2,500 rpm
Evaluation of stall test
9. Turn off the engine.
Time Lag Test
This test measures time lag for checking the hydraulic components and the friction elements.
1. Perform mechanical system test preparation.
2. Start the engine.
3. Warm up the engine until the ATF reaches 66 - 77° C (150 - 170° F).
4. After normal operating temperature is reached, shift the selector from N position to D range.
5. Use a stopwatch to measure the time it takes from shifting until engagement is felt. Make three measurements for each test and average the results.
6. Perform the test for the following shifts in the same manner.
- N position > R position
Time lag
N > D range ... below approx. 1.0 second
N > R position ... below approx. 1.0 second
Evaluation of time lag test
7. Turn off the engine.
Torque Converter Clutch Operation Test
This test verifies that the torque converter clutch control system and the torque converter are operating properly.
1. Perform mechanical system test preparation.
2. Perform the on-board diagnostic test. If DTC P0743 is retrieved, repair it.
Warning Doing this test by yourself can be dangerous. You could have an accident if you are looking at the test instructions or devices while driving, which may resulting in death or injury. Always have another person in the vehicle with you to read the instructions or devices while you drive.
3. Warm up the engine to normal operating temperature by driving the vehicle at highway speeds for approximately 15 minutes in D range.
4. After normal operating temperature is reached, maintain a constant vehicle speed of about 80 km/h (50 mph), and tap the brake pedal with the left foot.
5. Entwine rpm should increase when the brake pedal is tapped, and decrease about 5 seconds after the brake pedal is released. If this does not occur, refer to Transmission Control Systems.
6. If the vehicle stalls in D range at engine idling with vehicle is stopped, move the selector lever to 1 range. If the vehicle stalls, the cause may be the converter control valve in the oil pump. Service as required. If the vehicle does not stall in 1 range, refer to Transmission Control Systems.