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Home >> Oldsmobile >> 1987 >> Calais Base, 4D Sedan, 2.5 U, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> 2.3L VIN [D] CEC Tests W/Codes >> Diagnostic Code Flow Charts (Code Charts) >> Code 13 - Open Oxygen (O2) Sensor Circuit >> Diagnostic Aids

Diagnostic Aids

Normal scan voltage ranges between .1-1.0 volt (100-999 mV), while in "closed loop". Code 13 will set in 20 seconds if voltage remains between .35-.55 volt. System will go into "open loop" in 15 seconds. See INTERMITTENTS in the CEC TESTING W/O CODES (TROUBLE SHOOTING) article in the ENGINE PERFORMANCE section.

Fig 1: Code 13 Schematic - Open O2 Sensor Circuit
G51731
Fig 2: Code 13 Flow Chart - Open O2 Sensor Circuit
G57971
Fig 3: Code 13 Flow Chart - Open O2 Sensor Circuit
GB0046209
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