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Home >> Isuzu >> 1989 >> Trooper XS, 2.8 R >> Repair and Diagnosis >> Engine Performance >> System >> Tests W/Codes - V6 >> Diagnostic Procedures >> Code 13 - Oxygen (O2) Sensor Open Circuit >> Diagnostic Aids
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Diagnostic Aids

Normal "Scan" tester voltage varies between .1-1.0 volt while in "closed loop". Code 13 sets in about one minute if voltage remains between .35 and .55 volts, but the system will go "open loop" in about 15 seconds. For intermittent inspection, see INTERMITTENTS under TESTS W/O CODES - EFI article.

Fig 1: Flow Chart - Code 13, Open Oxygen Sensor Circuit
G122210Courtesy of ISUZU MOTOR CO.
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