This diagnostic test monitors Throttle Position (TP) sensor, Engine Speed, Manifold Absolute Pressure (MAP), EGR Flow, and Air Conditioning (A/C) clutch status. Engine operation requires that a large change in manifold pressure must be preceded by a change in engine load due to changes in throttle angle, engine speed, EGR flow or A/C clutch status. If TP sensor, engine speed, EGR Flow, and A/C Clutch remain constant, and there is a rapid change in MAP, DTC P0106 will set.

MAP changes by more than 10 kPa in 12.5 milliseconds during a period when engine speed varied less than 4 RPM, throttle angle varied less than 1 degree, EGR fuel compensation varied less than 4%, A/C clutch did not cycle, overheat/low coolant condition was not present, and traction control was not active.

Perform the Powertrain Ground Check chart in this section looking for poor or open grounds which could cause an intermittent signal problem.

Use the scan tool snapshot and graph function to aid in diagnosing sensor performance failures. Refer to scan tool users guide for further information.

Number(s) below refer to the step number(s) on the Diagnostic Table.

2. Since a misfire can cause DTC P0106 to set, if a misfire has occurred, it should be diagnosed first.

3. Checking if the MAP sensor can read barometric pressure correctly (85 to 105 kPa). An accurate Indicator of the expected MAP reading for any elevation can be obtained by multiplying the local barometer reading from the weather service by 3.4. This will indicate the approximate MAP (BARO) reading in kPa with the key ON and the engine OFF.

4. Checking the MAP sensor's ability to react to a known vacuum (26 to 34 kPa).

5. Checking the MAP sensor's ability to react to a known vacuum (26 to 34 kPa).

6. Checking the MAP sensor's ability to react to a sudden change in vacuum.