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HOMESERVICE MANUALSBUICK2006TERRAZA CXL, 3.5 L, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 146 (ENGINE CONTROL SYSTEM - 3.6L (LY7) - DTC P0008 TO DTC P0133)DTC P0101TEST DESCRIPTION
2006 Buick Terraza CXL, 3.5 L, AWD

Test Description

2006 Buick Terraza CXL, 3.5 L, AWDSECTION Test Description
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 3:  A circuit failure may cause this DTC to set. If DTC P0102 or P0103 are set, diagnose DTC P0102 or P0103 first.
  2. 6:  This step tests for high resistance in the ignition 1 voltage circuit of the MAF sensor. If the DMM does not display near battery voltage there is high resistance in the circuit.
  3. 8:  The ECM produces a measurable steady-state amperage that provides the 5-volt reference to the MAF sensor. If the amperage on the 5-volt reference circuit is less than 80 mA, test the 5-volt reference circuit for an open or a high resistance.
  4. 9:  This step tests for high resistance in the signal circuit of the MAF sensor.
  5. 10:  This step tests for high resistance in the low reference circuit of the MAF/intake air temperature (IAT) sensor. The MAF sensor and the IAT sensor share the low reference circuit. If there is a condition with the low reference circuit, a MAF and IAT sensor DTC may set. The ECM must be completely powered down to obtain an accurate resistance reading. It may take up to 30 minutes for the ECM to power down after the ignition key is removed. Removal of the ECM fuse or the PCM/ETC fuse, allows the ECM to power down completely.
  6. 15:  Inspect the MAF/IAT sensor connector for water intrusion, corrosion and bent or damaged terminals.
  7. 16:  Inspect the ECM connectors for water intrusion, corrosion and bent or damaged terminals.
DTC P0101

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 in Vehicle DTC Information
2
IMPORTANT: If you were sent here from a fuel trim DTC, go to step 5 of this diagnostic procedure.
  1. Start the engine.
  2. Observe the Diagnostic Trouble Code (DTC) Information with a scan tool.
Does the DTC fail this ignition?		 - Go to Step 3  Go to Step 4 
3  Is DTC P0102 or DTC P0103 also set? - Go to DTC P0102  or DTC P0103  Go to Step 5 
4
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. 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 5  Go to Diagnostic Aids
5 Inspect for the following conditions:
  • An engine vacuum leak
  • An air leak in the intake air duct between the mass air flow (MAF) sensor and the throttle body
  • A plugged or collapsed intake air duct
  • Objects that block the MAF sensor air inlet
  • An air filter element that is restricted
  • A restricted throttle plate or for carbon build-up around the throttle plate
  • An unseated engine oil dip stick
  • A loose or missing engine oil fill cap
  • An over filled crankcase

Did you find and correct the condition?		 - Go to Step 20  Go to Step 6 
6 
  1. Turn OFF the ignition.
  2. Disconnect the MAF/intake air temperature (IAT) sensor.
  3. Turn ON the ignition, with the engine OFF.
    4. NOTE: Do NOT use the low reference circuit in the component harness connector for this test. Damage to the control module may occur due to excessive current draw.
    RENDER: 1.0x

    NO RELATED

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    When to See a Mechanic

    Stop DIY work and contact a certified mechanic immediately if any of the following apply:

    • • You smell fuel, burning insulation, or see smoke.
    • • Brakes feel soft, pull hard to one side, or make grinding noises.
    • • The engine overheats, stalls repeatedly, or misfires under load.
    • • You are missing required tools, torque specs, or safe lifting equipment.
    • • You are not confident in the next step or safety outcome.