Circuit/System Verification
- Ignition ON, observe the DTC information with a scan tool. DTCs P0107, P0108, P0122, or P0123 should not be set.
- If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Start the engine and observe the scan tool MAP sensor pressure parameter. The MAP sensor pressure parameter should change while starting the engine.
- Engine idling, observe the scan tool MAP Sensor pressure parameter. The reading should be between 32-48 kPa.
- Compare the MAP sensor pressure parameter to the pressure parameter of a known good vehicle. The reading should be within 3 kPa of the known good vehicle.
- Compare the MAP sensor pressure parameter to the reading in the table. The MAP sensor pressure parameter should be within the specified range indicated on the table.
- Snap the throttle while observing the MAP sensor pressure parameter on the scan tool. The MAP sensor pressure parameter should change rapidly when the throttle position changes.
- If the vehicle passes the Circuit/System Verification test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.
IMPORTANT:
In extreme cold weather conditions ice may form in the vacuum source to the MAP sensor and may set a DTC. Inspect the MAP sensor and the vacuum source for ice, moisture, or other restrictions.
IMPORTANT:
The vehicle used for the comparison is not limited to the same type of vehicle being serviced. A vehicle known to provide an accurate reading is acceptable.
IMPORTANT:
The Altitude vs Barometric Pressure table indicates a pressure range for a given altitude under normal weather conditions. Weather conditions consisting of very low or very high pressure and/or very low or very high temperature may cause a reading to be slightly out of range.