4R70W/4R75W Automatic Transmission
4R70W/4R75W Automatic TransmissionRotunda Transmission Tester
The Rotunda Transmission Tester is used to diagnose the digital transmission range (TR) sensor and is used in conjunction with the pinpoint tests. The tests should be carried out 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.
^ Digital Transmission Range (TR) Sensor Testing
^ Resistance/Continuity Test
^ Voltage Test - PARK/NEUTRAL, REVERSE Lamp and Optional Circuits