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Home >> Buick >> 1994 >> Roadmaster Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Controls - Tests W/Codes) >> ECM/Pcm Code Charts >> Code 16, OPTI-Spark Ignition System Low Resolution Pulse >> Diagnostic Aids
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Diagnostic Aids

WARNING: This page is about a different car, the 1994 Cadillac Fleetwood. However, it is still accessible from the selected car via links, so may be relevant.

An open, a short to voltage, a short to ground or a defective sensor inside distributor can prevent reference voltage from pulsing at PCM resolution terminal. If Code 16 does not reset and vehicle still does not start, go to NO START - ENGINE CRANKS OKAY in the BASIC TESTING article in this section.

Fig 1: Code 16 Schematic (Fleetwood) Opti-Spark Ignition System Low Resolution Pulse
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Fig 2: Code 16 Flow Chart (Fleetwood) Opti-Spark Ignition System Low Resolution Pulse
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