Test Equipment

The following equipment is recommended to properly diagnose and test the Electronic Engine Control I (EEC I) system.

• Digital Volt/Ohmmeter (T78L-50-DVOM).
• EEC I Tester (T78L-50-EEC-1).
• Blue (2-Pin) Test Fixture (203929).
• Brown (2-Pin) Test Fixture (294156).
• Yellow (3-Pin) Test Fixture (203814).
• Ignition Module (Black 4-Pin) Test Fixture (203821).
• Tachometer (0-3000 RPM Range).
• Vacuum/Pressure Gauge (25" Hg/15 psi Range).
• Timing/Advance Light (27-0002).
• Speed Control Tester (Snap-On GA-437).
  NOTE: Ford Motor Company recommends the use of the EEC I tester and test fixtures to test and diagnose the EEC I system. Test equipment, however, is no longer available. Test fixtures can simulate good sensors. See Figure.

  This article, known good sensors, a digital volt/ohmmeter, and test clips (to tap into circuit being tested) should be sufficient to diagnose the EEC I system. Test Clips (JP-13288) are available from J.S. Popper, Inc. 200 Liberty Street Little Ferry, NJ 07643 (201) 641-3252

  Read entire test procedure and study the wiring diagram to determine what (how) each sensor/circuit is being tested. After you're familiar with the circuits and test values given in the test steps, test and correct affected circuit. Retest circuit after each repair.