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  1. #1
    txbikerdude
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    Default finally got a code off my car... now what the h&&% does it mean? :)

    Ok finally rented a $250 code scanner from the auto parts store and plugged it in my car. I get the following error, but I have no idea what in the heck it means or how to fix it

    P0106
    Manaifold Absolute Pressure / Barometric Pressure Circuit Range / Performance Problem



    Can anyone point in me in the right direction on what this means and how to fix it?

  2. #2
    Member gmjunkie's Avatar
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    03 Z-51,78 L82 Coupe

    Default

    Quote Originally Posted by txbikerdude View Post
    Ok finally rented a $250 code scanner from the auto parts store and plugged it in my car. I get the following error, but I have no idea what in the heck it means or how to fix it

    P0106
    Manaifold Absolute Pressure / Barometric Pressure Circuit Range / Performance Problem



    Can anyone point in me in the right direction on what this means and how to fix it?
    It means unless you know and understand the electronics on these cars,You should probly be headed to the dealer!



    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 the following circuits:
    • A 5-volt reference circuit
    • A low reference circuit
    • A MAP sensor signal circuit
    The engine control module (ECM) supplies 5 volts to the MAP sensor on the 5-volt reference circuit. The ECM, also, provides a ground on the low reference circuit. The MAP sensor provides a signal to the ECM on the MAP sensor signal circuit which is relative to the pressure changes in the manifold. The ECM should detect a low signal voltage at a low MAP, such as during an idle or a deceleration. The ECM 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). The MAP sensor is also used 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 ECM monitors the MAP sensor signal for voltage outside of the normal range.
    The ECM calculates a predicted value for the MAP sensor based on throttle position and engine speed. The ECM then compares the predicted value to the actual MAP sensor signal. If the ECM detects that the MAP sensor signal is not within the predicted range, DTC P0106 sets.
    DTC Descriptor

    This diagnostic procedure supports the following DTC:
    DTC P0106 Manifold Absolute Pressure (MAP) Sensor Performance
    Conditions for Running the DTC

    • DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0335, and P0336 are not set.
    • The engine speed is between 400-6,800 RPM.
    • The change in engine speed is less than 125 RPM.
    • The engine coolant temperature (ECT) is between 70-125°C (158-257°F).
    • The intake air temperature (IAT) is between -7°C and +125°C (+19°F and +257°F).
    • The above conditions are present for more than 1 second.
    • DTC P0106 runs continuously when the above conditions are met.
    Conditions for Setting the DTC

    The MAP signal is more than 15 kPa from the predicted MAP signal 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.
    • Clear the MIL and the DTC with a scan tool.
    • Test Description



    The numbers below refer to the step numbers on the diagnostic table.
    1. This step tests the ability of the MAP sensor to correctly indicate BARO.
      This step tests the ability of the MAP sensor to respond to an increase in engine vacuum.
    2. This step tests for a proper MAP sensor pressure with an applied vacuum.
    Step
    Action
    Values
    Yes
    No
    Schematic Reference: Engine Controls Schematics
    Connector End View Reference:
    Engine Control Module (ECM) Connector End Views or Engine Controls Connector End Views
    1
    Did you perform the Diagnostic System Check - Vehicle?
    --
    Go to Step 2
    Go to Diagnostic System Check - Vehicle
    2
    Are DTCs P0107 or P0108 set?
    --
    Go to Diagnostic Trouble Code (DTC) List - Vehicle
    Go to Step 3
    3
    Inspect for the following conditions:
    • Vacuum hoses that are disconnected, damaged, or incorrectly routed
    • Manifold absolute pressure (MAP) sensor seal that is missing or damaged
    • Restrictions in the MAP sensor vacuum source
    • Intake manifold vacuum leaks
    Did you find and correct the condition?
    --
    Go to Step 22
    Go to Step 4
    4
    Important: The vehicle used for the comparison is not limited to the same type of vehicle as is being serviced. A vehicle known to provide an accurate reading is acceptable.

    Do you have access to another vehicle in which the MAP sensor pressure can be observed with a scan tool?
    --
    Go to Step 5
    Go to Step 6
    5

    1. Turn ON the ignition, with the engine OFF.Observe the MAP sensor pressure with a scan tool.Observe the MAP sensor pressure in the known good vehicle with a scan tool.
    2. Compare the values.
    Is the difference between the values less than the specified value?
    3 kPa
    Go to Step 7
    Go to Step 12
    6
    Important: The Altitude vs. Barometric Pressure table indicates a pressure range for a given altitude under normal weather conditions. Weather conditions consisting of very low or very high pressure and/or very low or very high temperature may cause a reading to be slightly out of range.

    1. <LI type=1>Turn ON the ignition, with the engine OFF. <LI type=1>Observe the MAP sensor pressure with a scan tool. Refer to Altitude vs Barometric Pressure .
    2. The MAP sensor pressure should be within the range specified for your altitude.
    Does the MAP sensor indicate the correct barometric pressure?
    --
    Go to Step 7
    Go to Step 12
    7

    1. Turn OFF the ignition. Remove the MAP sensor from the intake manifold. Refer to Manifold Absolute Pressure (MAP) Sensor Replacement . Leave the MAP sensor connected to the electrical harness. Connect a J 23738-A Mityvac to the MAP sensor. Turn ON the ignition, with the engine OFF.Observe the MAP sensor pressure with a scan tool.
    2. Apply vacuum to the MAP sensor with the J 23738-A until 5 inches Hg is reached.
    Does the MAP sensor pressure change?
    --
    Go to Step 8
    Go to Step 12

    8
    1. Observe the MAP sensor pressure with the scan tool.
    2. Apply vacuum to the MAP sensor with the J 23738-A in 1 inch Hg increments until 15 inches Hg is reached. Each 1 inch Hg should decrease MAP sensor pressure by 3-4 kPa.
    Is the decrease in MAP sensor pressure consistent?
    --
    Go to Step 9
    Go to Step 12
    9

    1. Observe the MAP sensor pressure with the scan tool.
    2. Apply vacuum with the J 23738-A until 20 inches Hg is reached.
    Is the MAP sensor pressure less than the specified value?
    34 kPa
    Go to Step 10
    Go to Step 12

    10
    1. Observe the MAP sensor pressure with the scan tool.
    2. Disconnect the J 23738-A from the MAP sensor.
    Does the MAP sensor pressure return to the original reading observed in step 4 or step 5?
    --
    Go to Step 11
    Go to Step 20
    11
    Inspect for the following conditions:
    • Incorrect cam timing--Refer to Timing Chain and Sprockets Replacement for the correct timing.
    • Restricted exhaust flow--Refer to Restricted Exhaust .
    • Worn piston rings--Refer to Engine Compression Test .
    Did you find and correct the condition?
    --
    Go to Step 22
    Go to Intermittent Conditions
    12
    Test for an intermittent and a poor connection at the MAP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
    Did you find and correct the condition?
    --
    Go to Step 22
    Go to Step 13

    13
    1. Disconnect the MAP sensor harness connector. Turn ON the ignition, with the engine OFF. Measure the voltage from the 5-volt reference circuit of the MAP sensor to a good ground, with a DMM. Note the measurement as "Supply voltage".Connect a test lamp and a DMM in series between the 5-volt reference circuit and the low reference circuit of the MAP sensor at the harness connector.
    2. Measure the amperage with the DMM. Note the measurement as "Amperage".
    Is the amperage equal to the specified value?
    0 mA
    Go to Step 17
    Go to Step 14

    14
    1. Remove the DMM from the circuit.Connect the test lamp between the 5-volt reference circuit and the low reference circuit of the MAP sensor, at the harness connector.Measure the voltage from the 5-volt reference circuit at the test lamp to a good ground, with the DMM. Note the measurement as "Load voltage drop". Subtract the "Load voltage drop" from the "Supply voltage". Note the result as "Supply voltage drop".
    2. Divide the "Supply voltage drop" by the amperage.
    Is the result more than the specified value?
    5 ohms
    Go to Step 16
    Go to Step 15

    15
    1. Measure the voltage from the low reference circuit of the MAP sensor at the test lamp to a good ground, with the DMM. Note the result as "Low reference voltage drop".
    2. Divide the "Low reference voltage drop" by the amperage.
    Is the result more than the specified value?
    5 ohms
    Go to Step 18
    Go to Step 20
    16
    Test the 5-volt reference circuit between the engine control module (ECM) and the MAP sensor for high resistance. Refer to Circuit Testing and Wiring Repairs .
    Did you find and correct the condition?
    --
    Go to Step 22
    Go to Step 19
    17
    Test the low reference circuit between the ECM and the MAP sensor for an open. Refer to Circuit Testing and Wiring Repairs .
    Did you find and correct the condition?
    --
    Go to Step 22
    Go to Step 19
    18
    Test the low reference circuit between the ECM and the MAP sensor for high resistance. Refer to Circuit Testing and Wiring Repairs .
    Did you find and correct the condition?
    --
    Go to Step 22
    Go to Step 19
    19
    Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
    Did you find and correct the condition?
    --
    Go to Step 22
    Go to Step 21
    20
    Replace the MAP sensor. Refer to Manifold Absolute Pressure (MAP) Sensor Replacement .
    Did you complete the replacement?
    --
    Go to Step 22
    --
    21
    Replace the ECM. Refer to Control Module References for replacement, setup, and programming.
    Did you complete the replacement?
    --
    Go to Step 22
    --

    22
    1. Clear the DTCs with a scan tool.Turn OFF the ignition for 30 seconds.Start the engine.
    2. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
    Did the DTC fail this ignition?
    --
    Go to Step 2
    Go to Step 23
    23
    Observe the Capture Info with a scan tool.
    Are there any DTCs that have not been diagnosed?
    --
    Go to Diagnostic Trouble Code (DTC) List - Vehicle
    System OK

    junk!!
    "WARNING"
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    www.gmjunkie.com
    Founding Member: 10 Corvettes Anonymous


  3. #3
    txbikerdude
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    Default

    where is the MAP sensor located in the engine????

  4. #4
    Member gmjunkie's Avatar
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    #3

    junk!!
    "WARNING"
    The views and opinions of this forum user might not be suitable for others, this user may appear to be heavily over-medicated, under medicated, intoxicated, listening to the voices in his head or just plain being an ass, so some viewers may be offended!~!!!
    www.gmjunkie.com
    Founding Member: 10 Corvettes Anonymous


  5. #5
    txbikerdude
    Guest

    Default

    good man!! thank you!!

    well I found it, car still runs rough but runs with the MAP unplugged... Called and ordered a replacement MAP sensor via my dealer.... so we will see..

    thank you again

  6. #6
    txbikerdude
    Guest

    Default

    Well CRAP..... I replaced the sensor with a new one from the dealer, and the car still runs rough\wont start. still throws out the same code

  7. #7
    Member gmjunkie's Avatar
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    As I said in my first post!!

    Quote Originally Posted by gmjunkie View Post
    It means unless you know and understand the electronics on these cars,You should probly be headed to the dealer!


    Quote Originally Posted by txbikerdude View Post
    Well CRAP..... I replaced the sensor with a new one from the dealer, and the car still runs rough\wont start. still throws out the same code
    Tests needs to be done things need to be checked!There is more to todays vehicles than just scanning it and changing a part! Thats what separates the Technicians from the Parts Changers!!
    junk!!
    "WARNING"
    The views and opinions of this forum user might not be suitable for others, this user may appear to be heavily over-medicated, under medicated, intoxicated, listening to the voices in his head or just plain being an ass, so some viewers may be offended!~!!!
    www.gmjunkie.com
    Founding Member: 10 Corvettes Anonymous


  8. #8
    txbikerdude
    Guest

    Default

    thanks... that made me feel better about my car not running.

  9. #9
    Member tim414's Avatar
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    2010 '427' Z06 JetStream Blue

    Default

    Quote Originally Posted by txbikerdude View Post
    thanks... that made me feel better about my car not running.
    I was curious, did you find out what the problem was????

  10. #10
    Technical Writer for Internet & Print Media
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    Quote Originally Posted by txbikerdude View Post
    Well CRAP..... I replaced the sensor with a new one from the dealer, and the car still runs rough\wont start. still throws out the same code
    First, you need to get out of the state-of-mind which has you "guessing" at the solution, then buying parts you don't need.

    Next, you need to carefully read the FSM excerpt that Junk posted and follow the instructions.

    Third, know that the majority of engine controls problems are not with sensors or actuators but are with wiring and connections.

    Yeah...a new MAF can be a solution to this DTC but there is a host of other solutions, too, such as vacuum leaks, engine mechanical problems, MAF wiring and connections or maybe even the ECM.

    My advice would be: if you don't own a scan tester or following FSM diagnostic procedures is something your prefer not to do, I'd take the car to a service facility experienced with engine controls diagnostics because having them fix the car may end-up being less expensive that replacing parts on a trial-and-error basis.

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