Diagnostic Aids
WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
- If a DTC P0452 is intermittent, road test the vehicle while observing the FTP sensor with a scan tool. A momentary reading of -30.0 mm Hg (-16 in H2O) or less may indicate an intermittent short to ground in the sensor input circuit.
- If a DTC P0452 is intermittent, driving the vehicle under the conditions outlined in the Inspection/Maintenance (I/M) section can verify whether the fault is present. Refer to Inspection/Maintenance (I/M) Evaporative Emission (EVAP) System Set Procedure .
- An intermittent malfunction may be caused by a fault in the sensor electrical circuit. Inspect the wiring harness and the components for an intermittent condition. Refer to Intermittent Conditions .
Repair any electrical circuit faults that were found. Refer to Wiring Repairs in Wiring Systems.
The information included in the Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC first set.