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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1865 (Engine Controls And Fuel - 3.5L (L66) - DTC P0506 To DTC P2199) >> DTC P0507 >> 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 prompts the technician to check for any condition that can affect the ability of the TAC motor to control engine idle speed. A DTC P0507 can set even if there is no fault in the TAC system. Any condition that can affect the idle speed of the engine must be repaired first, in order to enable proper diagnosis of the DTC P0507.
  3. 4:  This step tests whether the PCM can operate the TAC motor with the scan tool. The TAC motor can be commanded to increase and/or decrease engine speed by using the scan tool Engine Speed Control function. The Engine Speed Control function of the scan tool is disabled when the engine temperature is less than 85°C (185°F).
DTC P0507

Step Action Value(s) Yes No
1  Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Inspect the engine for any of the following conditions:
    • A stuck or damaged throttle valve or throttle body
    • A vacuum or intake air leaks
    • An evaporative emission (EVAP) system malfunction
    • Faulty positive crankcase ventilation (PCV) system operation

      Refer to Crankcase Ventilation System Inspection/Diagnosis .

  2. Repair the condition as necessary.
Did you find and correct a condition?		 - Go to Step 4  Go to Step 3 
3
  1. Use the scan tool in order to clear the DTCs.
  2. Perform the Idle Learn Procedure. Refer to Idle Learn .
  3. Turn OFF the engine for 30 seconds.
  4. Start the engine.
  5. Observe the Desired Idle Speed and Engine Speed parameters on the scan tool.
Are the Engine Speed and the Desired Idle Speed within the specified value of each other?		 200 RPM Go to Step 6  Go to Step 4 
4 
  1. Start the engine.
  2. Select Engine Speed Control in the Special Functions menu of the scan tool. Refer to Scan Tool Output Controls .
  3. Use the scan tool to command the throttle actuator control (TAC) motor to decrease the engine speed to the Desired Idle Speed.
Did the engine speed decrease as commanded by the scan tool to the Desired Idle Speed?		 - Go to Rough, Unstable, or Incorrect Idle and Stalling Go to Step 5 
5
  1. Locate the malfunction in the TAC system.
  2. Repair as necessary.
Did you complete the repair?		 - Go to Step 6  -
6
  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 or until the DTC P0507 diagnostic has passed.
Does the DTC run and pass?		 - Go to Step 7  Go to Step 2 
7 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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