p0180?? what is this??

[d_805_dawg]

Hello, here again with another problem, I did a search but I couldn't find any info, what does p0108 means exactly and what should I chage to make it go away? again, thank you all for your great input.

[Eggert]

Hi,
short answer: dealer item because of need for scan tool.

Please specify model and year.
P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input
From http://www.obdii.com/codes.html

Service manual says:
DTC P0108

Circuit Description
The manifold absolute pressure (MAP) sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load. The MAP sensor has the following:
• A 5-volt reference circuit
• A low reference circuit
• A signal circuit
The powertrain control module (PCM) supplies 5 volts to the MAP sensor on the 5-volt reference circuit. The PCM also provides a ground on the low reference circuit. The MAP sensor provides a signal to the PCM on the signal circuit which is relative to the pressure changes in the manifold. The PCM should detect a low signal voltage at a low MAP, such as during an idle or a deceleration. The PCM should detect a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a wide open throttle (WOT). Certain vehicle models will also use the MAP sensor in order to determine the barometric pressure (BARO). This occurs when the ignition switch is turned ON, with the engine OFF. The BARO reading may also be updated whenever the engine is operated at WOT. The PCM monitors the MAP sensor signal for voltage outside of the normal range.
If the PCM detects a MAP sensor signal voltage that is excessively high, DTC P0108 will set.
Conditions for Running the DTC
• The following DTCs are without Electronic Throttle Control (ETC):
DTC P0121, P0122, or P0123 are not set.
• The following DTCs are with Electronic Throttle Control (ETC):
DTCs P1120, P1125, P1220, P1221, P1275, P1276, P1280, P1281, P1285, P1286, P1514, P1515, P1516, P1517, or P1518 are not set.
• The engine is running.
• The throttle angle is 0 percent when the engine speed is less than 1200 RPM.
• The throttle angle is less than 20 percent when the engine speed is more than 1200 RPM.
Conditions for Setting the DTC
The MAP sensor voltage is more than 4.9 volts for more than 4 seconds.

Action Taken When the DTC Sets
• The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
• The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC
• The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
• A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
• A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
• Use a scan tool in order to clear the MIL and the DTC.
Diagnostic Aids
• Inspect the MAP sensor vacuum source for the following conditions:
- Leaks
- Restrictions
- Poor connections
• If an intermittent condition exists, refer to Intermittent Conditions.
Test Description
The numbers below refer to the step numbers on the
diagnostic table.
2. The MAP sensor 5-volt reference circuit is shared with other sensors. If DTC P1635 is set, the 5-volt reference circuit is either shorted to ground, or is shorted to voltage. Diagnose this condition first. The short may be on another sensor's 5-volt reference circuit.
4. Operate the vehicle within the same conditions as when the DTC failed. If you cannot duplicate the DTC, use the information included in the Freeze Frame and Failure Records data in order to locate an intermittent condition.

The diagnostic table (more than a page long) says scan tool this and scan tool that, so I did not post it here.
Scan tool costs $3,000 and usually only dealers have it.

Take care, Eggert