Service manual

90-898303
4-17
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.
• Records engine running information.
a) Electronic Control Module (ECM)
Notes
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