Mazda Workshop Service and Repair Manuals > B4000 Regular Cab 4WD V6-4.0L OHV (1997) > Powertrain Management | Computers and Control Systems | Powertrain Control Module (PCM) <--> [Engine Control Module] | Component Information | Description and Operation | Powertrain Control Module

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Powertrain Control Module (PCM): Description and Operation
Ignition Diagnostic Monitor Signal

IGNITION DIAGNOSTIC MONITOR (IDM) SIGNAL

IDM signal communicates information by pulse width modulation. IDM circuit is enclosed in PCM.

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