ECM Ground
The ECM recieves electrical current and maintains a current flow through the processor from input voltage to ground. If the ground is not maintained the voltage can build as it would in a capacitor and spike when grounded much like the coil on an old school ignition system.
The input voltage is 12 volts but is reduced in the ECM and functions on 1 to 5 volts. That is how the computer system can function with such fine, or small diameter wiring. If the power spikes it will burn an internal circut and destroy the ECM. The batterys need to be disconnected so there is no power, then remove, clean, and coat all ground connections with dielectric compound. Then reconnect grounds. Due to the low opperating voltage the continuity on all connections is extremly important.
I hope this helps.
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Mike & Holly 1999 Monaco Diplomat 38A-1998 Toyota Landcruiser
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