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Home >> Chevrolet >> 1999 >> Tracker 2WD L4-2.0L VIN C >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Initial Inspection and Diagnostic Overview >> - Component Diagnostic Testing >> Coastdown Downshift Test
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Coastdown Downshift Test









Power (P) Shift Mode
Set the Power/Normal switch to the Power (P) position.
1. Verify the manual selector is in the Drive (D) position.
2. Depress the OD switch.
3. Accelerate the vehicle until the transmission is in fourth gear (OD) and the TCC is applied.
4. Release the accelerator pedal and lightly apply the brake pedal, bringing the vehicle to a complete stop.
5. Verify that the TCC releases.
6. Monitor the vehicle speeds at points of downshifts.

Normal (N) Shift Mode
Set the Power/Normal switch to the Normal (N) position.
1. Verify the manual selector is in the Drive (D) position.
2. Depress the OD switch.
3. Accelerate the vehicle until the transmission is in fourth gear (OD) and the TCC is applied.
4. Release the accelerator pedal and lightly apply the brake pedal, bringing the vehicle to a complete stop.
5. Verify that the TCC releases.
6. Monitor the vehicle speeds at points of downshifts. Verify that the gear downshifts and the TCC release occur properly as shown in the shift speed tables below. If the transmission is not within specifications, refer to Line Pressure Test for possible causes and corrections.

Manual Second (2) Gear Range Selection Test
1. Stop the vehicle.
2. Move the manual selector to the Second (2) range.
3. Slowly accelerate the vehicle and verify that the transmission upshifts from the first to the second gear.

Manual Third (D) Range
1. Slowly accelerate the vehicle to 40 km/h (25 mph).
2. Verify that the transmission does not upshift from second to third gear.
3. Verify that the TCC does NOT engage.

Manual Low Test
1. Stop the vehicle.
2. Place the manual selector in the Low (L) range.
3. Slowly accelerate the vehicle.
4. Verify that the transmission does not upshift from the first to the second gear.
5. Verify that the TCC does NOT engage.

Reverse (R) Test
1. Stop the vehicle.
2. Place the manual selector in the Reverse (R) range.
3. Slowly accelerate the vehicle.
4. Verify that the vehicle operates in a rearward direction.


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