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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1381 (Engine Control System Diagnosis (DTC P0505 To DTC P2445) -- 1.8L (LNK)) >> Diagnosis >> DTC P1011 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Vibe. 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. 1:  The Diagnostic System Check-Engine Controls 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 whether the rocker arm oil control solenoid is stuck ON. When ON at idle or low engine speed, the solenoid increases valve lift enough to cause the engine to run rough or stall.
  3. 7:  The rocker arm oil pressure switch is closed when oil pressure is less than 20 kPa (3 psi).
  4. 9:  This step visually inspects the operation of the rocker arm oil control solenoid. The solenoid plunger and spool valve movement should be smooth and rapid from extended to retracted positions.
DTC P1011

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Powertrain Control Module (PCM) Connector End Views  or  Engine Controls Connector End Views 
1  Did you perform the Diagnostic System Check-Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls
2  Is the engine running rough or stalling? - Go to Step 5  Go to Step 3 
3
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Run the engine at idle for 1 minute.
Did a DTC P1011 set?		 - Go to Step 7  Go to Step 4 
4 Operate the vehicle within the Freeze Frame conditions as specified.
Did a DTC P1011 set?		 - Go to Step 9  Go to Intermittent Conditions
5
  1. Disconnect the electrical connector of the rocker arm oil control solenoid.
  2. Start the engine.
Is the engine still running rough or stalling?		 - Go to Step 11  Go to Step 6 
6
  1. Test for a short to voltage or a short to ground in the electrical circuits of the rocker arm oil control solenoid.
  2. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct a condition?		 - Go to Step 15  Go to Step 14 
7 
  1. Disconnect the electrical connector of the rocker arm oil pressure switch.
  2. Measure the resistance of the rocker arm oil pressure switch.
Is the resistance less than the specified value?		 3Ω Go to Step 8  Go to Step 13 
8
  1. Test for an open in the input circuit of the rocker arm oil pressure switch.
  2. Inspect for poor electrical connections at the rocker arm oil pressure switch or the PCM. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
  3. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct a condition?		 - Go to Step 15  Go to Step 9 
9 
  1. Remove the rocker arm oil control solenoid. Refer to Rocker Arm Oil Control Solenoid Valve Replacement .
  2. Turn ON the ignition, with the engine OFF.
  3. Connect the rocker arm oil control solenoid to B+ and ground with a pair of fused jumper wires.
  4. Observe the movement of the solenoid plunger when electrical voltage is applied and removed.
Does the solenoid plunger extend to the specified value when voltage is applied and then retract smoothly when voltage is removed?		 3 mm (0.125 in) Go to Step 10  Go to Step 12 
10
  1. Test for an intermittent short to voltage or short to ground in the electrical circuits of the rocker arm oil control solenoid.
  2. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct a condition?		 - Go to Step 15  Go to Step 14 
11
  1. Inspect for a restriction or blockage in the oil return passage of the rocker arm oil control system.
  2. Repair as necessary.
Did you find and correct a condition?		 - Go to Step 15  Go to Step 12 
12 Replace the rocker arm oil control solenoid valve. Refer to Rocker Arm Oil Control Solenoid Valve Replacement .
Did you complete the replacement?		 - Go to Step 15  -
13 Replace the rocker arm oil pressure switch. Refer to Rocker Arm Oil Pressure Switch Replacement .
Did you complete the replacement?		 - Go to Step 15  -
14 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
Did you complete the replacement?		 - Go to Step 15  -
15
  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 as specified in the supporting text.
Does the DTC run and pass?		 - Go to Step 16  Go to Step 2 
16 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 System OK
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