Toyota Corolla Repair Manual: 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
|
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 ...
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:
Inspection procedure
1 Check d squib circuit(airbag sensor assy center – horn button
assy)
Disconnect the negative (–) terminal cable from the battery,
and wait at least for 90 seconds.
disconnect the connectors between the airbag sensor
assy center and the horn button assy.
for the orange c ...
System limits
General information
The system cannot be activated or meaningfully
used in certain situations.
Safety information
Warning
The system is designed to operate in certain
conditions and circumstances. Due to conditions
or other factors, the system may not respond.
There may be a risk of accident or ris ...
Inspection procedure
1 Check tvip ecu
Check that the operation of the tvip function is normal.
Hint:
with this inspection, the tvip ecu cpu can be diagnosed if it works normally or
not.
2 Check wire harness (tvip ecu integration relay)
Disconnect the tvip ecu and integration relay connectors.
ch ...