Diagnostic Aids

Normal scan tester voltage varies between .1-1.0 volts while in closed loop. Code 13 sets after approximately one minute if voltage remains between .347 and .547 volt, but system will enter open loop in approximately 15 seconds. For intermittent inspection, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES - FUEL INJECTION article.

Fig 1: Code 13 - Schematic (DOHC)

Courtesy of ISUZU MOTOR CO.

Fig 2: Code 13 - Diagnostic Flowchart (DOHC)

Courtesy of ISUZU MOTOR CO.