Scan Tool Testing and Procedures

NOTE: Use the AODE transmission tester overlay to diagnose the 4R70W transmission.

The Rotunda Transmission Tester is used to diagnosis electronically controlled transmission and is used in conjunction with the pinpoint tests. The tests should be performed in order. Installing the Rotunda Transmission Tester allows separation of the vehicle electronics from transmission electronics.
- Bench Testing - Engine Off
- Resistance/Continuity Test
- Solenoid Voltage Test
- Dynamic Testing - Engine On
- EPC Solenoid
- Transmission Engagements
- Upshifts/Downshifts
- Torque Converter Clutch (TCC) Engagement
- Output Shaft Speed (OSS) Sensor
- Digital Transmission Range (TR) Sensor Testing
- Resistance/Continuity Test
- Voltage Test - Park/Neutral, Backup Lamp, and Optional Circuits