P0108

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
The Manifold Absolute Pressure (MAP) sensor responds to changes in intake manifold pressure. The PCM supplies a 5 volt reference and a ground for the MAP sensor. The MAP sensor provides a signal to the PCM relative to the pressure changes in the manifold. With low manifold absolute pressure (high vacuum such as during idle or deceleration), the PCM should detect a low MAP sensor signal voltage. With high manifold absolute pressure (low vacuum such as key ON, engine OFF or wide-open throttle), the PCM should detect a high MAP sensor signal voltage. The PCM monitors the MAP signals for voltages outside the normal range of the MAP sensor. If the PCM detects a MAP sensor voltage that is excessively high, DTC P0108 will set.

CONDITIONS FOR RUNNING THE DTC
^ TP sensor DTCs are not set.
^ Engine Speed is more than 1000 RPM.
^ Throttle angle is less than 90 percent when engine speed is less than 1000 RPM.
^ Throttle angle is less than 97 percent when engine speed in more than 1000 RPM.

CONDITIONS FOR SETTING THE DTC
^ The MAP sensor signal voltage is more than 49 volts.
^ The condition exists for less than 1 second.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM illuminates the Malfunction Indicator Lamp (MIL) during the second consecutive trip in which the diagnostic test runs and fails.
^ The PCM stores the conditions present when the DTC set as Freeze Frame and Fail Records data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM will turn the MIL OFF after the third consecutive trip in which the diagnostic runs and passes.
^ The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using the scan tool Clear DTC Information function.

DIAGNOSTIC AIDS
For intermittent conditions, refer to DTC P1106 Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage and/or Symptoms. P1106 Symptom Related Diagnostic Procedures