Just installed cam and headers on an 02 A4. Running great. Check engine light came on and showed the following codes. Po106H & U1000H. Can anyone please help.
:eek:

 

U1000H H=history meaning it happened before and not now is loss of communication undetermined RFA. The PCM lost comm. with something check for loose wires to MAF or intake air temp sender, etc.

PO106 I don't have in my list. It can be loss of comm. to MAF or MAP sensor voltage problem. It kinda falls in between the two on my list, if Po1o6 is the correct number.

 

Thanks alot for the info!

 

1000 - 1255 codes can bascially be ignored. They typicall occur when another signal takes priority and bumps another signal on the communications bus.


DTC P0106
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 a 5-volt reference circuit, a low reference circuit, and 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 that 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 the normal range. The PCM calculates a predicted value for the MAP sensor based on the throttle position and the engine speed. The PCM then compares the predicted value to the actual MAP sensor signal. DTC P0106 will set if the MAP sensor signal is not within the predicted range.

Conditions for Running the DTC
The engine is running
The engine speed is between 400-5,000 RPM
The change in the engine speed is less than 125 RPM
DTC P0101- P0103, P0107, P0108, P0440, P0442, P0443, P0446, P1120, P1125, P1220, P1221,P1275, P1276, P1280, P1281, P1285, P1286, P1514, P1515, P1516, P1517, or P1518 are not set.
The traction control is not active.
The A/C compressor clutch is steady.
The power steering is stable.
The clutch switch state does not change.
The brake switch state does not change.
All conditions are stable for 1 second.
Conditions for Setting the DTC
The actual MAP sensor signal is not within the predicted range for 2 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.
Clear the MIL and the DTC with a scan tool.
Diagnostic Aids
Inspect for the following conditions:
Restrictions in the MAP sensor vacuum source.
The MAP sensor seal is missing or damaged.
Vacuum hoses that are disconnected, damaged, or incorrectly routed.
Intake manifold vacuum leaks
Vacuum leaks at the throttle body
If an intermittent exists, refer to Intermittent Conditions .

 

That went about 10 floors over my head. I checked out your website and
think I better spend some time there for OBDII- course 101.

thanks! :confused:

 

Shawn,

You NEVER cease to amaze me!