C 2500 3/4 Ton Pickup 2WD L6-250 4.1L VIN D 2-bbl (1984)
Electronic Spark Timing: Testing and Inspection
Use the following procedures to diagnose ESC system malfunctions only. To diagnose general ignition system malfunctions, refer to ``High Energy
Ignition (HEI) System Diagnosis.''
Fig. 5 ESC system wiring schematic. 1984-86 models w/manual 4 speed top loader transmission
Fig. 6 ESC system wiring schematic. 1984-86 models w/manual 3 & 4 speed side loader transmission