Alternator Fr Signal

This signals the ECM when the alternator (ALT) is charging. For troubleshooting of the FR signal circuit, see Fig 1 and Fig 2 .

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

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: Alternator (ALT) FR Signal Diagnostic Flow Chart (2 Of 2)

Courtesy of AMERICAN HONDA MOTOR CO., INC.