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Three wire O2 sensor voltage
Measuring voltage at purple wire, harness side, idling hot, we are seeing .55 volts [...] the scanner O2 voltage pid is fluctuating between 440 to 480. Should this not be a steady 450, o2 disconnected ?. Have checked O2 and PCM grounds, adding a ground wire to... Login to read more. 
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| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
1994 Chevrolet K1500 Suburban 5.7L
| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
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