Road Test Procedure: Notes

Important:  The Road Test Procedure should be performed only as part of 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 Detent Downshifts
• Full Throttle Detent Downshifts
• Manual Downshifts
• Coasting Downshifts
• Manual Gear Range Selection
  • REVERSE
  • Manual FIRST
  • Manual SECOND
  • Manual THIRD

  Important:  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 the Transmission Fluid Checking Procedure .
• 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.

  After the road test, check the following:

• Transmission fluid level. Refer to the Transmission Fluid Checking Procedure .
• Diagnostic Trouble Codes (DTCs) that may have set during the testing. Refer to the applicable DTC.
• Scan tool data for any abnormal readings or data.