Before Pinpoint Tests

NOTE: Prior to performing pinpoint tests, check the powertrain control module wiring harness for proper connections, bent or broken pins, corrosion, loose wires, proper routing, proper seals and their condition. Check the powertrain control module (PCM) (12A650), sensors and actuators for damage. Refer to the Powertrain Control/Emissions Diagnosis Manual OBDII.

If DTCs appear while performing the On-Board Diagnostics, refer to the following Diagnostic Trouble Code Charts for the appropriate service procedure. Prior to entering Pinpoint Tests, refer to any TSBs and OASIS messages for 4R70W transmission concerns.

NOTE: After electrical diagnosis has been performed and a concern still exists, refer to the Diagnosis by Symptom Index under Diagnosis by Symptom in the Diagnosis and Testing portion of this section.