DTC U1016: Loss Of Serial Communications - Pcm: Testing
- If multiple class 2 DTCs are set as current (i.e., U1300, U1301, U1088 or U1153), check for an intermittent short to ground or battery in Purple wire. See WIRING DIAGRAMS .
- If DTC is current, attempt to establish communication with PCM using scan tool. If communication cannot be established, diagnose and repair problem in PCM. See TESTS W/CODES article in ENGINE PERFORMANCE section. If communication can be established, replace PZM. See REMOVAL & INSTALLATION.
- If DTC is history, check for intermittent open in Purple wire. See WIRING DIAGRAMS .