Diagnostic Aids

Normal scan tester voltage varies between .1 and 1.0 volt while in closed loop. Code 13 sets in about 40 seconds if voltage remains between .35 and .55 volt, but system will enter open loop in about 15 seconds. For intermittent inspection, see INTERMITTENTS in appropriate TESTS W/O CODES article.

Fig 1: Code 13 - Schematic

Courtesy of ISUZU MOTOR CO.

Fig 2: Code 13 - Diagnostic Flowchart

Courtesy of ISUZU MOTOR CO.