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 .35 and .55 volt, but system will enter open loop in approximately 15 seconds. For intermittent inspection, see INTERMITTENTS in appropriate TESTS W/O CODES article in the ENGINE PERFORMANCE Section.

Fig 1: Code No. 13 Schematic (1.6L SOHC) Oxygen Sensor (Non-Heated Sensor) Open/Shorted Circuit

Fig 2: Code No. 13 Flow Chart (1.6L SOHC) Oxygen Sensor (Non-Heated Sensor) Open/Shorted Circuit