Basic EEC Trouble Shooting
- Perform a visual check of all computer related wiring and connectors. Ensure ignition and fuel system are in proper working order. Start and run engine at 1800 RPM until upper radiator hose is hot.
- Connect analog voltmeter positive lead to Lt. Green/Black wire (circuit No. 99) at thermactor air diverter solenoid. Connect voltmeter negative lead to ground. Apply 20" Hg of vacuum to BP/MAP sensor "VENT" port for at least 30 seconds. See Fig 1.
- As vacuum is released, throttle kicker solenoid will extend to begin self-test. Voltmeter needle will also pulse 2 times (4 times on carbureted engines).
- After a few minutes, throttle kicker will retract to indicate end of self-test mode. If any trouble codes are present, the ECA will then transmit code(s) to voltmeter. The 2 digit codes are obtained by counting voltmeter needle pulses.
- With battery disconnected, check circuit (wire) continuity with an ohmmeter. If necessary, test resistance of all sensors and solenoids, using values given in COMPONENT RESISTANCE VALUES chart. Be sure to disconnect component from circuit before checking resistance.EEC III DIAGNOSTIC CODES CHART
Code Circuit 11 EEC III System Okay 12 RPM 15 Memory Check 21 ECT 22 MAP 23 TP 24 ACT 28 BP 31 EGR 32 EGR Closed 41 Fuel Lean 42 Fuel Rich 43 Engine Cold 44 Thermactor