Toyota Corolla Repair Manual: Mechanical system tests

Toyota Corolla Repair Manual / Diagnostics / Electronic controlled automatic transaxle / Mechanical system tests

1. Perform mechanical system tests

Measure the stall speed.
The object of this test is to check the overall performance of the transaxle and engine by measuring the stall speeds in the d and r positions.

Notice

Do the test at normal operating atf temperature 50 to 80 °c (122 to 176 °f).
Do not continuously run this test for longer than 5 seconds.
To ensure safety, do this test in a wide, clear level area which provides good traction.
The stall test should always be carried out in pairs. One technician should observe the conditions of wheels or wheel stoppers outside the vehicle while the other is doing the test

Chock the 4 wheels.
Connect an obd ii scan tool or hand–held tester to the dlc3.
Fully apply the parking brake.
Keep your left foot pressed firmly on the brake pedal.
Start the engine.
Shift into the d position. Press all the way down on the accelerator pedal with your right foot.
Quickly read the stall speed at this time.
Stall speed: 2,550 150 rpm
do the same test in the r position.
Stall speed: 2,550 150 rpm

Evaluation:

Problem	Possible cause
(A) stall speed low in d and r positions	Engine output may be insufficient stator one–way clutch not operating properly H int : if the value is less than the specified value by 600 rpm or more, the torque converter could be faulty.
(B) stall speed high in d position	Line pressure too low forward clutch slipping no. 2 One–way clutch not operating properly u/d one–way clutch not operating properly
(C) stall speed high in r position	Line pressure too low direct clutch slipping 1st and reverse brake slipping u/d brake slipping
(D) stall speed high in d and r positions	Line pressure too low improper fluid level u/d one–way clutch not operating properly

Measure the time lag.

When the shift lever is shifted while the engine is idling, there will be a certain time lapse or lag before the shock can be felt. This is used for checking the condition of the direct clutch, forward clutch, and 1st and reverse brake.

Notice

Do the test at normal operating atf temperature 50 to 80 °c (122 to 176 °f).
Be sure to allow 1 minute interval between tests.
Take 3 measurements and take the average value

Connect an obd ii scan tool or hand–held tester to the dlc3.
Fully apply the parking brake.
Start the engine and check idle speed.
Idle speed: 650 ± 50 rpm (in n position and a/c off)
shift the shift lever from the n to d position. Using a stop watch, measure the time from when the lever is shifted until the shock is felt.
Measure the time lag of n " r in the same way.

Time lag:
n → d less than 1.2 Seconds n → r less than 1.5 Seconds

Evaluation (if n " d time or n " r time lag is longer than specified):

Problem

Possible cause

N → d time lag is longer

Line pressure too low
forward clutch worn
u/d one–way clutch not operating properly

N → r time lag is longer

Line pressure too low
direct clutch worn
1st and reverse brake worn
u/d one–way clutch not operating properly

Road test

1. Problem symptom confirmation Taking into consideration the results of the customer problem analysis, try to reproduce the symptoms of the trouble. If the problem is that the transaxle does ...

Hydraulic test

1. Perform hydraulic test Measure the line pressure. Notice: Do the test at normal operation atf temperature 50 to 80 °c (122 to 176 °f). The line pressure test should always be carrie ...

Other materials:

Refueling
Opening the fuel tank cap Perform the following steps to open the fuel tank cap: Before refueling the vehicle ● Close all the doors and windows, and turn the engine switch off. ● Confirm the type of fuel. ■Fuel types Unleaded gasoline (Octane rating 87 [Research Octane Number ...

Check short circuit
If the wire harness is ground shorted as shown in fig. 5, Locate the section by conducting a resistance check with the body ground in step (b). Check the resistance with the body ground. Disconnect connectors a and c and measure the resistance between terminals 1 and 2 ...

Overhaul
1. Remove w/head taper screw plug no.2 Using a socket hexagon wench 10, remove the taper screw plug and gasket. 2. Remove valve lifter Remove the valve lifters from the cylinder head. 3. Remove valve Place the cylinder head on wooden blocks. using sst, compres ...