DTC 12 - Rpm Signal
The Integrated Ignition Assembly (IIA) contains 2 pick-up coils ("G" and "NE"). The "G" signals informs ECM of the standard crankshaft position. The "NE" signals informs the ECM of the crankshaft position and engine speed.
If the "NE" signal is not present to ECM within 2 seconds or more after cranking, check for open or short in the "G" or "NE" circuit, or for a faulty IIA.
If "G" signal is not present from ECM for 3 seconds or more with engine speed between 600-4000 RPM, check for open or short in "STA" circuit or for a faulty ECM.