Basic EEC Trouble Shooting
- Perform basic fuel system and ignition system checks, to ensure there is gas and spark.
- Remove air cleaner assembly and inspect all vacuum and pressure hoses for proper connection to fittings, or any broken, cracked or pinched conditions.
- Inspect EEC sub-system harness for proper connections to EGR solenoid valves. Red wire to both, Yellow wire to vacuum solenoid and Green wire to vent solenoid.
- Check for any loose or detached connectors or broken or detached wires. Ensure all terminals are completely seated.
- Repair items as required and replace air cleaner.
- Check battery charge, cable connections and main electrical wiring.
- Test resistance of all sensors and solenoids, using values given in EEC III COMPONENT RESISTANCE VALUES chart. Be sure to disconnect component from circuit before checking resistance.
EEC III COMPONENT RESISTANCE VALUES
| Component | Wire Colors | Resistance | |
|---|---|---|---|
| Crank Position Sensor | Gry-Dk Blu | 100-640 | |
| Distributor Position Sensor | Gry-Dk Blu | 300-800 | |
| Coolant (ECT) Sensor | Lt Grn/Yel-Blk/Wht | 1100-8000 | |
| Air Charge Temp (ACT) | Lt Grn/Ppl-Blk/Wht | 1700-60.000 | |
| Throttle Position (TP) Sensor | |||
| Closed Throttle | Org/Wht-Blk/Wht | 3000-5000 | |
| Closed Throttle | Dk Grn/Lt Grn-Blk/Wht | 550-1100 | |
| Wide Open Throttle | Dk Grn/Lt Grn-Blk/Wht | 2100 or more | |
| EGR Control Solenoid | Red-Yel | 30 or more | |
| EGR Vent Solenoid | Red-Dk Grn | 30 or more | |
| TK Solenoid | Red-Red/Lt Grn | 45 or more | |
| TAB Solenoid | Red/Wht/Red | 45-90 | |
| TAD Solenoid | Red-Lt Grn/Blk | 45-90 | |
| Fuel Pump Relay | Red-Tan/Lt Grn | 40 or more | |
| By-Pass Ballast Resistor | N/A | 3 or less | |
NOTE:
The pin number provided is for the positive lead of a hi- impedence digital voltmeter. The negative voltmeter connector can go to pin # 8 (Ckt. # 60) or a good body ground to complete the circuit test.