Grand Caravan FWD V6-181 3.0L SOHC (1993)
The "high data rate" signal is used to control ignition timing for engine speeds up to 1200 RPM, because during cranking and at idle, engine speed
changes with the firing pulse of each cylinder.
Above 1200 rpm, speed changes due to individual firing pulses are negligible. Therefore the "Low data rate" slots are used to time fuel injection
and ignition at engine speeds above 1200 RPM.
If the PCM does not detect input from the pick-up, the PCM de-activates the ASD and fuel pump relays, interrupting power to the fuel pump,
injectors, coil, and oxygen sensor heater, preventing fuel injection and ignition, (a no start condition).
