ECM - Revised Code E042 (EST Circuit) Diagnostic Chart

9219oldsmobile05

NUMBER: 90-T-147

CORP.REF.NO: 016525

DATE: August 1990

SECTION: 8D1


SUBJECT:
SERVICE MANUAL UPDATE - SECTION 8D1-ECM TROUBLE CODE DIAGNOSIS REVISED CODE E042 DIAGNOSTIC CHART

MODELS/YEARS:
1990 TORONADO 3800 (VIN C)





This bulletin is to update the Code E042 Diagnostic Chart on page 8D1-53 in Section 8D1 "ECM Trouble Code Diagnosis" for the 1990 Toronado models with 3800 (VIN C) engine.

The revised chart addresses the possibility of a faulty ignition module setting Code E042 by not grounding the EST signal (CKT 423) during crank.