Tachometer Inoperative

Connect Tech 1 scan tool to data link connector. Start engine. Read engine RPM from tachometer and Tech 1 scan tool. If Tech 1 scan tool displays engine RPM, repair open or short to ground in White wire. If wire is okay, replace instrument cluster. If Tech 1 displays zero for engine RPM, repair open or short to ground in White wire. If wire is okay, replace ignition coil or Vehicle Control Module (VCM).