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Alternator Fr Signal

This signals the ECM when the alternator is charging. See Fig 1 and Fig 2 .

Fig 1: Alternator (ALT) FR Signal Diagnostic Flowchart (1 Of 2)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: Alternator (ALT) FR Signal Diagnostic Flowchart (2 Of 2)

Courtesy of AMERICAN HONDA MOTOR CO., INC.