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Home >> Pontiac >> 2007 >> Vibe Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - DTC P0452 To DTC P2138 >> DTC P0505 >> Test Description

Test Description

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

  1. 1:  A 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. 5:  This step verifies the correct position of the throttle plate. If the TP sensor value at idle is above or below the specified range, DTC P0505 can set.
  3. 10:  This step determines the cause of a too large or too small throttle opening. The fault can be with the throttle body or with the TAC module.
DTC P0505

Step Action Value(s) Yes No
1  Did you perform A Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Are there any other DTCs set? - Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 3 
3
  1. Start the engine.
  2. Run the engine until a normal operating temperature of at least 80°C (174°F) is achieved.
  3. Allow the engine to idle for at least 15 minutes after reaching operating temperatures.
  4. Operate the engine at 2,500 RPM for 90 seconds.
  5. Release the throttle and wait 30 seconds while the engine idle stabilizes.
  6. Observe the Engine Speed and TP Sensor parameters on the scan tool with the transmission in Park or Neutral.
Are the Engine Speed and the throttle position (TP) sensor within the specified ranges?		 650-750 RPM
8-13% TP Sensor		 Go to Step 4  Go to Step 5 
4
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC.
Is there a DTC P0505 in Last Test Failed?		 - Go to Step 5  Go to Diagnostic Aids
5  Is the TP sensor value within the specified range? 8-13% TP Sensor Go to Step 6  Go to Step 10 
6
  1. Inspect the positive crankcase ventilation (PCV) system for the following conditions:
    • Inspect for the correct operation of the PCV system.
    • Inspect for the correct PCV valve.
  2. Repair or replace as necessary.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 7 
7
  1. Inspect the intake air system for the following conditions:
    • Inspect for any blockage or restrictions.
    • Inspect for leaks in the ducts, fittings, and gaskets from the mass air flow (MAF) sensor to the intake manifold.
  2. Repair or replace as necessary.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 8 
8
  1. Inspect the throttle body for the following conditions:
    • Inspect for any blockage or restrictions in throttle bore.
    • Inspect for leaks at the throttle body connections.
    • Inspect for a worn or damaged throttle plate and bore.
  2. Repair or replace as necessary. Refer to Throttle Body Assembly Replacement .
Did you find and correct the condition?		 - Go to Step 11  Go to Step 9 
9
  1. Inspect the carpet or floor mat for interfering with the free movement of the accelerator pedal.
  2. Inspect for a binding or damaged accelerator pedal assembly. Repair or replace as necessary.
Did you find and correct the condition?		 - Go to Step 11  Go to Rough, Unstable, or Incorrect Idle and Stalling
10 
  1. Inspect the throttle body for the following conditions:
    • Inspect for any blockage or restrictions in throttle bore.
    • Inspect for excessive carbon deposits on the throttle plate and bore.
    • Inspect for a binding or damaged throttle plate and bore.
  2. Repair or replace as necessary. Refer to Throttle Body Assembly Replacement .
Did you complete the action?		 - Go to Step 11  -
11
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC.
Is there a DTC P0505 in Last Test Failed?		 - Go to Step 2  Go to Step 12 
12 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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