Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Chevrolet >> 1990 >> Caprice Base, 5.7 7 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4.3L TBI >> Pcm/BCM Code Charts >> Code 42, Est Circuit Open Or Grounded >> Test Number 4)

Test Number 4)

If module did not switch, this tests for a short in EST circuit, an open in by-pass circuit and a faulty ignition module connection or module.

scientia non olet · About Mike's Workshop Manuals