Test Aa - Introduction
CAUTION:
Stop this test at first sign of a fuel leak. DO NOT
allow smoking or an open flame in the vicinity of the vehicle during these tests.
NOTE:
Enter this Pinpoint Test only when QUICK TEST have been successfully completed and the engine is still a no start, or when directed here from another test or chart.
NOTE:
This test is intended to diagnose only the following EEC-IV ignition systems and circuits:
- Spark (ECA Controlled)
- Wiring Harness Circuits (PIP, IGN GND, VPWR)
- ECA
EDIS TEST PIN IDENTIFICATION (WIRE COLOR)
| Test Pin No. | Wire Color | |
|---|---|---|
| Pin 56 | ||
| 4.0L Aerostar | Dark Blue | |
| 4.0L Bronco/Ranger | Black/Light Blue | |
To prevent replacement of good components, be aware that the following non-EEC related areas and components may be at fault:
- Fuel Quality & Quantity
- Ignition (General Condition)
- Engine Mechanical Components
- Starter & Battery Circuits
- Variable Reluctance Sensor (VRS)
- EDIS Module
- Coil Packs