1988 Ford Festiva L PlusFACTORY OEM SERVICE PROCEDURE

ECA 19 - Code 16 (EGR Valve Position Sensor)

  1. Check for loose connectors, corrosion or damage at EVP sensor and ECA terminals 2F and 2C. Repair as necessary.
  2. Check resistance from Light Green wire terminal to Black wire terminal. Resistance should measure 4500-5500 ohms. Check resistance from Light Green wire terminal to Light Green/Black wire terminal. Resistance should measure 0-5500 ohms.
  3. If resistance is not within specification, replace EVP sensor. If resistance is within specification, check EGR valve operation before continuing with diagnosis.
  4. Check voltage at Light Green wire terminal to EVP sensor. If voltage reading is not about 5 volts, check for open or short in wiring between EVP sensor Light Green wire terminal and ECA terminal 2A. If no problem is found in wiring, replace ECA.
  5. Check continuity between EVP sensor and ECA. Check continuity between Light Green/Black wire and ECA terminal 2F. Check continuity between Black EVP sensor wire and ECA terminal 2C. Check for shorts in same wires. If wiring is okay, replace ECA.
  6. If continuity does not exist in wires, repair or replace as necessary. If symptom persists, go to ECA 55  .
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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.