Circuit/System Verification
- Ignition ON, verify that the following DTCs are not set: P0107, P0108, or P0651. If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.
- Verify that none of the following conditions exist:
- Leaking exhaust gas recirculation (EGR) valve
- Restricted exhaust-Refer to Restricted Exhaust .
- Engine mechanical condition--For example, low compression or incorrect timing belt installation. Refer to Symptoms - Engine Mechanical or Timing Belt Inspection .
- Determine the current vehicle testing altitude. Compare the MAP sensor pressure parameter to the reading in the Altitude Versus Barometric Pressure table . The MAP sensor pressure parameter should be within the specified range indicated in the table.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.
- 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.
- 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.
- Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.