Diagnostic Aids

A Code 23B will set if circuits No. D2 or D7 become open or short to ground. For intermittent inspection, see INTERMITTENTS in TESTS W/O CODES article in the ENGINE PERFORMANCE Section.

Fig 1: Code 23B Schematic - MAT Circuit (High Temperature Indicated)

Courtesy of ISUZU MOTOR CO.

Fig 2: Code 23B Flow Chart - MAT Circuit (High Temperature Indicated)

Courtesy of ISUZU MOTOR CO.