Checking the Gear System
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Problems that the customer may experience are hard shifts or slipping shifts. The following test-drive contains several different driving situations that may provoke these symptoms if the transmission is damaged.
NOTE:
It is important that the transmission oil is above 70°C before the test-drive starts
Test 1
- Driving at 100 km/h, 6th gear.
- Perform a kickdown to 4th gear.
- Let the transmission automatically shift up to 5th gear.
- Let up the accelerator pedal and let the transmission shift up to 6th gear.
Test 2
- Driving at 100 km/h, 6th gear.
- Slight uphill grade, press accelerator pedal until you obtain shifting 6-5, not kickdown.
Test 3
- Driving at 80 km/h.
- Move the gear selector to position M and engage 6th gear.
- Perform a kickdown and shift 6-5, 5-4, 4-3 at the same time.
- Then upshift immediately to 6th gear.
Test 4
- Stationary vehicle, engine running, parking brake applied, brake activated with left foot, gear selector in position R.
- Press down the accelerator pedal (brake still activated).NOTE: Let up the accelerator pedal in case of noise or slipping.
Test 5
- Stationary vehicle, engine running, parking brake applied, brake activated with left foot, gear selector in position D.
- Press down the accelerator pedal (brake still activated).NOTE: Let up the accelerator pedal in case of noise or slipping.
If the symptoms hard shifts or slipping shifts arise during the test-drive, the transmission's control system must be replaced.
Is the function OK?
- YES
Refer to Fault-Tracing Information .
- NO
Refer to Transmission Control System, Replacing .