Diagnostic Tools

The CEC system does not require special tools for diagnosis. A tachometer, a dwell meter, test light, ohmmeter, digital voltmeter with 10 megohms impedance (minimum), vacuum pump, vacuum gauge, and 6 jumper wires 6" long (1 wire with female connectors at both ends; 1 wire with male connectors at both ends; 4 wires with male and female connectors at opposite ends) are the only tools necessary for diagnosis.

A test light, rather than a voltmeter, must be used when indicated by a diagnostic chart.

The dwell meter is used to measure the time the M/C solenoid is on or off. This indicates if the M/C solenoid is working and the fuel mixture strength (rich or lean). The dwell meter is set on the 6-cylinder scale.

Dwell meter is connected to Green connector, located near the carburetor. This connector will not be connected to any circuit EXCEPT when you are testing with the dwell meter. DO NOT allow terminal wire to come in contact with any ground source, including rubber hoses.

NOTE: If engine operation seems to change when dwell meter is connected to Green wire, remove dwell meter and use another type. A few brands are not compatible with the CEC system.

When the engine is at operating temperature and idling, dwell meter needle should be varying between 10-50°. This indicates closed loop mode of operation. If the needle does not move, open loop operation is indicated.