Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Code 49 (Continuous Memory)

***THIS ARTICLE INCLUDES UPDATES MADE BY TSB #89-5A-13, DATED MARCH 1989***



Supplemental Testing Information (scroll down to find Diagnostic Test Charts):

Block Diagram:





DIS Wiring Schematic:





Wiring Diagram 38:





Abbreviations for the Schematic, Pinpoint Tests, and Breakout Box Overlay:





DIS Module and Pin-out:





DIS Component Location:





DIS Waveforms:





Diagnostic Test Charts:

Ignition Symptoms and Trouble Codes Index:





Pinpoint Test F1 - F3:





Pinpoint Test F4 - F5:





Pinpoint Test F6: