Before Pinpoint Tests

Before Pinpoint Tests

NOTE: Prior to entering pinpoint tests, check the PCM wiring harness for tight connections, bent or broken pins, corrosion, loose wires, correct routing, correct seals and their condition. Check the PCM, sensors and actuators for damage. Refer to Computers and Control Systems.

NOTE: If a concern still exists after electrical diagnosis has been carried out, refer to Diagnosis By Symptom; 4R70W/4R75W - Automatic Transmission

If DTC's appear while carrying out the on-board diagnostics, refer to the Diagnostic Trouble Code Charts 4R70W/4R75W Automatic Transmission for the appropriate repair procedure. Prior to entering pinpoint tests, refer to any TSBs for transmission concerns.