Diagnostic Aids

A Code 43 can be caused by a faulty connection at knock sensor, ESC module or ECM. Also check circuit No. B7 for possible open or short to ground. For intermittent inspection, see INTERMITTENTS under TESTS W/O CODES article in the ENGINE PERFORMANCE Section.

Fig 1: Code 43 Schematic - ESC (Electronic Spark Control)

Courtesy of ISUZU MOTOR CO.

Fig 2: Code 43 Flow Chart - ESC (Electronic Spark Control)

Courtesy of ISUZU MOTOR CO.