LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 1990 >> Bronco II RWD, Standard, M5OD-R1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Test QD - Re-Initialization Check >> Test QD: Step 4
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test QD: Step 4

4) WIGGLE TEST VPWR Circuit  With KOEO, connect DVOM to Self-Test connector. Deactivate Self-Test. Using Continuous Monitor Mode, perform WIGGLE TEST on EEC-IV harness from ECA to EEC Power Relay. If a fault is indicated or a Code 71 is displayed, repair intermittent in VPWR circuit. If no fault is indicated, inspect harness connections and pins. Repair as necessary. If harness is okay, replace EEC Power Relay and rerun QUICK TEST.