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 DA - Temperature Sensor Test (Act, ECT & Vat) >> Test DA: Step 91
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test DA: Step 91

91) Check EEC-IV Vehicle Harness  While in Continuous Monitor Mode (Wiggle Test), observe VOM or diagnostic tester while wiggling and bending EEC-IV harness from sensor to cowl, a small section at a time. Also check harness from cowl to ECA. If fault is indicated, isolate fault and repair as necessary. Repeat QUICK TEST. If no fault is found, go to next step.