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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1577 (Engine Controls And Fuel - 3.5L (L66) - DTC P2227 To DTC P2649) >> DTC P2227 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic table.

  1. 1:  The Diagnostic System Check - Vehicle prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool, if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
  2. 2:  This step checks for a MAP sensor fault.
  3. 3:  This step checks the accuracy of the MAP sensor. The MAP sensor should indicate atmospheric pressure when the ignition is ON and the engine is not running.
  4. 4:  This step checks for a faulty BARO sensor. The BARO sensor and the MAP sensor should indicate approximately the same pressure when the ignition is ON and the engine is not running.
  5. 8:  After replacing the PCM, a new minimum throttle position and idle speed must also be established.
DTC P2227

Step Action Value(s) Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module 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  Is there a Current or Pending DTC P0107 or DTC P0108 set? - Go to DTC P0107 or DTC P0108 Go to Step 3 
3 
  1. Turn ON the ignition, leaving the engine OFF.
  2. Clear the scan tool information.
  3. Select the MAP sensor parameter on the scan tool.
Is the manifold absolute pressure (MAP) sensor pressure reading near the specified value?		 97-100 kPa at sea level Go to Step 4  Go to Step 7 
4 
  1. Turn ON the ignition, leaving the engine OFF.
  2. Compare the pressure readings of the barometric pressure (BARO) sensor and the MAP sensor on the scan tool.
Is the difference between the BARO pressure and the MAP pressure more than the specified value?		 3 kPa Go to Step 8  Go to Step 5 
5
  1. Use the scan tool in order to clear the DTCs.
  2. Start the engine.
  3. Operate the vehicle within the Freeze Frame conditions as specified or until the DTC P2227 diagnostic test has run. Refer to the Test Description above.
Is DTC P2227 set?		 - Go to Step 6  Go to Diagnostic Aids
6
  1. Select the Freeze Frame/Failure Record for the current DTC P2227 on the scan tool.
  2. Review the MAP sensor readings in the Freeze Frame/Failure Record.
Were the recorded MAP sensor readings normal?		 - Go to Step 8  Go to Step 7 
7
  1. Inspect the MAP sensor for the following conditions:
    • A skewed or incorrectly calibrated MAP sensor
    • A blockage or restriction in the MAP sensor vacuum supply
    • Electrical resistance in the MAP sensor signal circuit
  2. Repair as necessary.
Did you complete the action?		 - Go to Step 9  -
8 
  1. Replace the powertrain control module (PCM). Refer to Control Module References for replacement, setup, and programming.
  2. Perform the idle learn procedure. Refer to Idle Learn .
Did you complete the replacement?		 - Go to Step 9  -
9
  1. Use the scan tool in order to clear the DTCs.
  2. Turn the ignition OFF for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text or until the DTC P2227 diagnostic test has run.
Does the DTC run and pass?		 - Go to Step 10  Go to Step 2 
10 With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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