Page 1578: Electronic Spark Control Module for S10/T10 Blazer 2WD L4-121 20L VIN Y 2-bbl (1983)
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. 4 ESC system wiring schematic. 1983
1983 MODELS
Engine Cranks But Will Not Start
1.
Inspect ESC harness for damage, shorts and opens. Inspect controller connector, distributor connectors and ignition switch connectors for
corrosion, damage and deformed terminals, Fig. 4. Repair connectors and wiring as needed.
2.
Disconnect distributor 4 pin connector, connect pins A and C on distributor side of connector with jumper wire, then attempt to start engine. If
