Road Test: Notes
NOTE:
The Road Test Procedure should be performed only as part of the Symptom Diagnosis.
Perform the road test in conjunction with the symptom diagnosis. Refer to Symptoms - Automatic Transmission .
The following test provides a method of evaluating the condition of the automatic transmission. The test is structured so that most driving conditions would be achieved. The test is divided into the following parts:
- Electrical Function Check
- Upshift Control and Torque Converter Clutch (TCC) Apply
- Part Throttle Step-In Downshifts
- Manual Downshifts
- Coasting Downshifts
- Manual Gear Range Selection
- REVERSE
- Driver Shift Control
NOTE:
Complete the test in the sequence given. Incomplete testing cannot guarantee an accurate evaluation.
Before the road test, ensure the following:
- The engine is performing properly.
- Transmission fluid level is correct. Refer to Transmission Fluid Level and Condition Check .
- Tire pressure is correct.
During the road test:
- Perform the test only when traffic conditions permit.
- Operate the vehicle in a controlled, safe manner.
- Observe all traffic regulations.
- View the scan tool data while conducting this test.
Take along qualified help in order to operate the vehicle safely.
- Observe any unusual sounds or smells.
- Ensure the transmission fluid temperature is at least 90°C (194°F).
After the road test, check the following:
- Inspect for proper transmission fluid level. Refer to Transmission Fluid Level and Condition Check .
- Inspect for any diagnostic trouble codes (DTCs) that may have set during the testing. Refer to the applicable DTC.
- Monitor the scan tool data for any abnormal readings or data.
- Inspect for fluid leaks. Refer to Fluid Leak Diagnosis .