Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Test Equipment
The following equipment is recommended to diagnose and test EEC-IV system. Some equipment is REQUIRED to perform tests. DO NOT attempt to test this system without proper equipment. Damage to vehicle components will result if improper equipment is used.
- Self-Test Automatic Read-Out (STAR) diagnostic tester is recommended but not required. It is specially built for the EEC-IV system and is used to display, as numerals, the 2- digit service codes that are programmed into the control module.
- Analog Volt/Ohmmeter (VOM) with 0-20V DC range. This can be used as an alternate to the diagnostic tester.
- Digital Volt/Ohmmeter (DVOM) with minimum 10 megaohm input impedance.
- Breakout Box (Part No. 014-00322). This is a jumper wire assembly which connects between the vehicle harness and the ECA. The breakout box is REQUIRED to perform certain tests on the system. Ford Motor Co. specifically states that using the probe from a DVOM will cause PERMANENT DAMAGE to the ECA 60- pin connector. "Test Pin" as called out in CIRCUIT TESTS refers to the pins on the breakout box. Once the breakout box has been installed during a test sequence, it may be left connected for the remainder of the test.
- Vacuum gauge with 0-30 in. Hg range and resolution (unit on scale) of 1 in. Hg.
- Tachometer with 0-6000 RPM range, accuracy +/- 40 RPM, and a resolution of 20 RPM.
- Vacuum pump with 0-30 in. Hg range.
- Timing light.
- Spark tester. A modified spark plug with side electrode removed and alligator clip attached may be used.
- Fuel Injection Pressure Gauge (Part No. T80L-9974-A).
- Non-powered test lamp.
- Jumper wire, about 15" long.
- MAP/BP tester. Unit plugs into MAP/BP sensor circuit and DVOM to check input and output voltages to verify correct sensor operation.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.