Check Alternator performance

1. Ignition "OFF"
2. Connect CH A probe to COM signal terminal (Pin No. 1) of Alternator connector and CH B probe to FR signal terminal (Pin No. 3) of Alternator connector.
3. Warm up the engine to normal operating temperature.
4. Measure signal waveform of COM and FR.

   Specification:  Refer to signal Waveform & Data

Courtesy of KIA MOTORS AMERICA, INC.

COM → Duty (+) Approx. 34%

Duty (-) Approx. 66%,

FR → Duty (+) Approx. 58%

Duty (-) Approx. 42%,

Courtesy of KIA MOTORS AMERICA, INC.

COM → Duty (+) Approx. 34%

Duty (-) Approx. 66%,

FR → Duty (+) Approx. 96%

Duty (-) Approx. 4%,

Duty (+) from FR terminal is increased if electrical loads are ON (Head Lamp and Defrost are ON) ECM controls generation of alternator with duty from FR terminal when electrical Loads turn on.