Pinpoint Test W : Aspirator Valve Control Circuit Faults: Notes
WARNING: This page is about a different car, the 2016 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The aspirator valve is also known as the vacuum solenoid valve.
Normal Operation and Fault Conditions
The ABS module uses a sensor mounted on the brake booster to monitor booster vacuum. The vacuum on-demand system keeps the brake booster vacuum at a predetermined level. When a low vacuum condition is detected by the ABS module, a message is sent to the PCM. The PCM responds by grounding the aspirator valve and allowing air to flow from the brake booster, creating additional vacuum in the booster.
An aspirator valve failure or an aspirator valve circuit fault results in the PCM setting a DTC. A hard brake pedal may also be present when one of these Diagnostic Trouble Codes (DTCs) is set.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P103C | Aspirator Valve Control Circuit/Open | This DTC sets in the PCM if the aspirator valve control circuit is open, the valve is open internally or there is no voltage being supplied to the valve. |
| P103D | Aspirator Valve Control Circuit Low | This DTC sets in the PCM if the aspirator valve control circuit is shorted to ground or the valve is shorted internally. |
| P103E | Aspirator Valve Control Circuit High | This DTC sets in the PCM if the aspirator valve control circuit is shorted to voltage or the valve is shorted internally. |
Possible Causes
- Wiring, terminals or connectors
- Vacuum hose aspirator valve
Visual Inspection and Diagnostic Pre-checks
- Make sure the aspirator valve housing is not cracked, missing pieces or damaged.