Toyota Tacoma manuals

Toyota Corolla Repair Manual: Road test

1. Problem symptom confirmation

  1. 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 not shift up, shift down, or the shift point is too high or too low conduct the following road test referring to the automatic shift schedule and simulate the problem symptoms.

2. Perform road test

Notice

: conduct the test at normal operating atf temperature 50 to 80 °c (122 to 176 °f).

  1. D position test shift into the d position and fully depress the accelerator pedal and check the following points:
  1.  check up–shift operation.

    Check that 1 " 2, 2 " 3 and 3 " o/d up–shift takes place, and that the shift points conform to the automatic shift schedule .

Hint

: o/d gear up–shift prohibition control

O/d and 3rd gear lock–up prohibition control

3Rd gear lock–up prohibition control

  1.  check for shift shock and slip.

    Check for shock and slip at the 1 " 2, 2 " 3 and 3 " o/d up–shift.

  2.  Check for abnormal noises and vibration.

    Run in d position lock–up or o/d gear and check for abnormal noises and vibration.

Hint: the check for the cause of abnormal noises and vibration must be done very thoroughly as it could also be sure to loss of balance in the differential, torque converter, etc.

  1.  Check kick–down operation.

    Check that the possible kick–down vehicle speed limits for 2nd to 1st, 3rd to 2nd, o/d to 3rd kick– downs conform to those indicated on the automatic shift schedule while driving through all gears with the shift lever in the d position .

  2.  Check for abnormal shock and slip at kick–down.
  3.  Check the lock–up mechanism.

If there is a big jump in engine speed, there is no lock–up.

  1.  2 position test shift into the 2 position and fully depress the accelerator pedal and check the following points:
  1.  check up–shift operation.

    Check that the 1 " 2 up–shift takes place and that the shift point conforms to the automatic shift schedule .

Hint

: there is no o/d up–shift and lock–up in the 2 position.

  1. Check engine braking.

    While running in the 2 position and 2nd gear, release the accelerator pedal and check the engine braking effect.

  2.  Check for abnormal noises during acceleration and deceleration, and for shock at up–shift and down–shift.
  1.  l position test shift into the l position and fully depress the accelerator pedal and check the following points:
  1.  check no up–shift.

    While running in the l position, check that there is no up–shift to 2nd gear.

  2.  Check engine braking.

    While running in the l position, release the accelerator pedal and check the engine braking effect.

  3.  Check for abnormal noises during acceleration and deceleration.
  1.  r position test shift into the r position and fully depress the accelerator pedal and check for slipping.

    Caution

    : before conducting this test ensure that the test area is free from people and obstruction.

  2. p position test stop the vehicle on a grade (more than 5°), shift into the p position and release the parking brake.

    Check that the vehicle does not move.

Check mode procedure
1. Dtc check (check mode) Hint: hand–held tester only: compared to the normal mode, the check mode has more sensing ability to detect malfunctions. Furthermore, the same diagnostic items which ar ...

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 an ...

Other materials:

Removal & installation and disassembly & reassembly
1. Remove oxygen sensor Remove a clip and tear off the floor mat.  disconnect a oxygen sensor connector. Remove the oxygen sensor. 2. Remove tail pipe assy Remove 2 bolts, 2 springs and tail pipe assy. 3. Remove floor panel brace front Remove 2 nuts and the ...

Definition of terms
Term Definition Monitor description Description of what the ecm monitors and how it detects malfunction (monitoring purpose and its details). Related dtcs Diagnostic code Typical enabling condition Preconditions that allow the ecm to detect m ...

Inspection procedure
1 Check p squib circuit(airbag sensor assy center – instrument panel passenger airbag 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 instrument panel pas ...

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