LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 1994 >> Explorer 2D Utility, 4WD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> EI System High Data Rate >> Engine Controls - System/Component Tests >> Preliminary Check
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Preliminary Check

Visually inspect engine compartment to ensure all vacuum hoses and spark plug wires are properly connected. Examine all wiring harnesses and connectors for damaged insulation, burned, overheated or damaged pins, and loose or broken conditions. Check sensor shield connector. Ensure Ignition Control Module (ICM) mounting screws are tight and battery is fully charged. All accessories should be off during diagnosis.

NOTE: A 12-volt incandescent (high voltage) test light should not be used to test circuit signals. It will load circuit and may cause incorrect measurements or faulty EI/PCM operation (engine stall).
WARNING: DO NOT connect PCM to EI diagnostic cable; 60-pin connector on this harness may be connected to a breakout box only. If PCM is connected to EI diagnostic cable, PCM may be damaged. Some tests may require a second breakout box to be connected to PCM 60-pin connector. When a second breakout box is used, PCM should be disconnected at all times. Never connect PCM to breakout box when performing EI diagnostics.
scientia non olet · About LEMON Manuals