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Home >> Pontiac >> 2003 >> Aztek AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1635: 5-Volt Reference 1 Circuit >> Diagnostic Aids
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Diagnostic Aids

If any sensor using a 5-volt bias voltage, such as the Intake Air Temperature (IAT) sensor or fuel sensor is shorted to voltage, DTC P1639 may set in addition to DTC P1635. For an intermittent condition, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 3.4L AZTEK & RENDEZVOUS article.

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