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Home >> Chevrolet >> 1990 >> Caprice Base, 4.3 Z, 4L60/MD8 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4.3L TBI >> Pcm/BCM Code Charts >> Code 13, Open Oxygen (O2) Sensor Circuit >> Test Number 3)

Test Number 3)

This tests O2 sensor circuit wiring. Use only a high impedance (10-megohm minimum) digital voltmeter.

NOTE: Caprice O2 sensor uses a heating element. Heating element is not controlled by ECM.
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