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Malibu Base
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Engine Control System Self-Diagnostics - 3.1L Engine
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DTC P1635: 5-Volt Reference Low
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Conditions For Setting DTC
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Conditions For Setting DTC
The PCM detects a voltage out of tolerance condition on the 5-volt reference 1 circuit.
The above condition is present for longer than 10 seconds.