4-Speed Automatic Transmission

Road Test
This test is to check if upshift, downshift and lock-up take place at specified speeds while actually driving vehicle on a level road.

WARNING:
^ Carry out test in very little traffic area to prevent an accident.
^ Test requires 2 persons, a driver and a tester.

1) Warm up engine.
2) With engine running at idle, shift select "D".
3) Accelerate vehicle speed by depressing accelerator pedal gradually.
4) While driving in "D" range, check if gear shift and lock-up occur properly as shown in Automatic Gear Shift Table.

Automatic Gear Shift Table
Automatic gear shift schedule is shown in the following table. Test-drive the vehicle on a flat road in the D position.

1. Shift point in D position and transfer shift position in 4H (motor-shift type 4WD model)





2. TCC lock-up point in D position and/or 4 position





3. TCC slip point in D and/or 4 position





NOTE:
The gear change is done at the shift point different from the above while any of the following control functions is working. Bear this in mind when performing inspection.

^ Slope Shift Control
When TCM makes up-slope judgment, Slope Shift Control (on up-slope) is executed by changing the gear change point to the high-speed side so as to reduce frequent up-shift and down-shift operations.
When TCM makes down-shift judgment, Slope Shift Control (on down-slope) is executed by changing the gear change point to the low-speed side so as to use engine-brake function effectively while driving on a down-slope.
^ Cruise Shift Control (if equipped with cruise control system)
Cruise Shift Control is executed by selecting appropriate gear according to requirement for retaining a constant vehicle speed or acceleration so as to reduce frequent up-shift and downshift operations while cruising.

Troubleshooting

Troubleshooting (Part 1):

Troubleshooting (Part 2):