Electronic Control Module - Mercury 150 EFI Service Manual

Electronic Control Module

The ECM requires 8 VDC minimum to operate. If the ECM should fail, the engine will stop
running.
The inputs to the ECM can be monitored and tested by the Digital Diagnostic Terminal
91-823686A2 using adaptor harness 84-822560A5.
The ECM performs the following functions:
Calculates the precise fuel and ignition timing requirements based on engine speed,
throttle position, manifold pressure and coolant temperature.
Controls fuel injectors for each cylinder and ignition for each cylinder.
Controls all alarm horn functions.
Supplies tachometer signal to gauge.
Controls RPM limit function.
Contains detonation control circuitry (200 Model only)
Records engine running information.
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90-883728 JULY 2001
Electronic Control Module (ECM)
IGNITION
58778
Page 2A-15