Component Tests and General Diagnostics

The CEC system should be considered as a possible source of trouble for engine performance, fuel economy and exhaust emission problems only after performing normal tests which would apply to a vehicle without the CEC system.

On all engine except 4-150 and 1984-87 6-258, the following equipment is needed to perform the diagnostic tests: a tachometer, a hand vacuum pump, a digital volt/ohmmeter with a minimum ohms-per-volt input impedance of 10 meg-ohms and jumper wires.

On 4-150 and 1984-87 6-258 engines, an electrical fuel feedback system tester, tool No. ET-501, is available to aid in system diagnosis. In the event tool No. ET-501 is not available, the following equipment is needed to perform the diagnostic tests: tachometer, hand vacuum pump, standard volt-ohmmeter, dwell meter and an inspection stethoscope.

On all models, after completing a repair, ensure that the malfunction has been eliminated.