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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 701 (Engine Controls And Fuel - 2.0L - DTC P1183 To DTC P2261) >> DTC P2261 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
DTC P2261

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Boost Control System Description: Boost Control System Description
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to DIAGNOSTIC SYSTEM CHECK - VEHICLE
2 
IMPORTANT: This diagnostic assumes that the engine is in satisfactory mechanical condition and able to provide sufficient vacuum to operate the boost control system.
  1. Turn OFF the ignition.
  2. Review the vacuum schematics in the Boost Control System Description. Refer to Boost Control System Description .
  3. Inspect for the following conditions
    • The vacuum lines for any cracking, loose fit, and for the proper connections at the following:
      • The bypass valve actuator
      • The bypass valve solenoid
      • The supercharger intake plenum
      • The engine intake manifold
    • The bypass valve actuator for sticking, binding, or damage
    • The bypass valve lever for damage
    • The bypass valve linkage for sticking, binding, or damage
    • The boost control solenoid for damage
Did you find and correct the condition?		 - Go to Step 15  Go to Step 3 
3
  1. Disconnect the boost signal hose from the bypass valve actuator.
  2. Connect a vacuum gauge to the boost signal hose.
  3. Start and idle the engine in park.
  4. Turn OFF all lights and accessories.
Is the vacuum at the specified value?		 0 in Hg Go to Step 4  Go to Step 10 
4
  1. Select Boost Control in the Engine Output Controls.
  2. Command the Boost Control Solenoid to 0 percent duty cycle with a scan tool.
  3. Observe the vacuum gauge.
Is the vacuum more than the specified value?		 15 in Hg Go to Step 5  Go to Step 8 
5
  1. Reconnect the boost signal hose to the bypass valve actuator.
  2. Disconnect the inlet vacuum signal hose from the bypass valve actuator.
  3. Connect a vacuum gauge to the inlet vacuum signal hose.
Is the vacuum more than the specified value?		 15 in Hg Go to Step 6  Go to Step 12 
6
  1. Turn OFF the ignition.
  2. Connect a vacuum pump to the inlet vacuum signal port on the bypass valve actuator.
  3. Slowly apply vacuum to the specified value, while observing the bypass valve actuator.
Does the bypass valve actuator retract?		 18 in Hg Go to Step 7  Go to Step 11 
7
  1. Connect the inlet vacuum signal hose to the bypass valve actuator.
  2. Disconnect the boost signal hose from the bypass valve actuator.
  3. Connect a vacuum pump to the boost signal port on the bypass valve actuator.
  4. Start and idle the engine in park.
  5. Slowly apply vacuum to the specified value.
Is the voltage more than the specified value?		 20 in Hg System OK Go to Step 11 
8
  1. Connect the boost signal hose to the bypass valve actuator.
  2. Disconnect the boost signal hose from the boost control solenoid.
  3. Connect a vacuum gauge to the boost signal port on the boost control solenoid.
  4. Command the boost control solenoid to 0 percent duty cycle.
Is the vacuum more than the specified value?		 15 in Hg Go to Step 14  Go to Step 9 
9
  1. Disconnect the boost source hose from the boost control solenoid.
  2. Connect a vacuum gauge to the boost source hose.
Is the vacuum more than the specified value?		 15 in Hg Go to Step 10  Go to Step 13 
10 Replace the boost control solenoid. Refer to BOOST CONTROL SOLENOID REPLACEMENT .
Did you complete the replacement?		 - Go to Step 15  -
11 Replace the bypass valve actuator. Refer to BYPASS VALVE ACTUATOR REPLACEMENT .
Did you complete the replacement?		 - Go to Step 15  -
12 Repair the inlet vacuum signal hose or the port for a restriction or blockage.
Did you complete the repair?		 - Go to Step 15  -
13 Repair the boost source hose or the port for a restriction or blockage.
Did you complete the repair?		 - Go to Step 15  -
14

Repair the boost signal hose or the port for a restriction or blockage.


Did you complete the repair?		 - Go to Step 15  -
15
  1. Connect any disconnected components.
  2. Clear the DTCs with a scan tool.
  3. Turn OFF the ignition for 90 seconds.
  4. Operate the vehicle within the conditions necessary to verify the repair.
Did you verify the repair?		 - Go to Step 16  Go to Step 2 
16

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
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