See Figures 1, 2 and 3
The CEC system should be considered as a possible source of trouble only after normal tests, that would apply to a vehicle without the system, have been performed.
The CEC Fuel Feedback System incorporates a diagnostic connector to provide a means for systematic evaluation of each component that could cause an operational failure. Electronic Fuel Feedback testers, ET-501-82 and ET-501-84 or equivalent, are available to aid in the system diagnosis. When a tester is not available, other test equipment can be substituted.
The equipment required to perform the checks and tests includes a tachometer, a hand vacuum pump and a digital volt-ohmmeter (DVOM) with a minimum ohms per volt of 10 megaohms.
Before performing the Diagnostic Tests, other engine associated systems that can affect air/fuel mixture, combustion efficiency or exhaust gas composition should be tested for faults. These systems include:
- Basic carburetor adjustments.
- Mechanical engine operation (spark plugs, valves, rings, etc.).
- Ignition system components and operation.
- Gaskets (intake manifold, carburetor or base plate); loose vacuum hoses or fittings, or loose electrical connections.