IGNITION
90-883728 JULY 2001 Page 2A-15
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.
58778
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a-Electronic Control Module (ECM)
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