![]() ![]() (Note the location of each pin before disassembly.) It may be necessary to disconnect or disassemble the connector assembly to perform some of the inspections. SPECIAL NOTE: Check all vehicle grounds in engine compartment, due to the age of the truck, many loose their connection creating many problems. Loose or detached connectors, wires and terminals. Proper emission routing per Vehicle Emission Control Information (VECI) Decal.Ĭheck the EEC system wiring harness electrical connections for: During basic operation, the EEC-IV determines the ignition timing required by the engine and a DIS module determines which ignition coil to fire.īefore running the KOER test or attempting to get new codes after servicing your vehicle, perform these procedures first. A good overview of this system can be found HERE. The EEC-IV system was started in 1984, with the check engine light being added in 1988. Check your emission label for more information on your vehicle. ![]() The Electronic Engine Control (EEC) comprises the brain AND the sensors.
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