4R70W

The Rotunda Transmission Tester is used to diagnosis electronically controlled transmissions 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; refer to the Rotunda Transmission Tester manual for these tests.
- 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