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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1870 (Engine Controls And Fuel - 3.5L (L66) - DTC P2227 To DTC P2649) >> DTC P2647 >> 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 on 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 checks whether the condition that caused the DTC to set still exists.
  3. 4:  The rocker arm oil pressure switch is closed when oil pressure is less than 49 kPa (7 psi).
  4. 8:  This step tests for a stuck on rocker arm oil control solenoid.
  5. 14:  After replacing the PCM, a new minimum throttle position and idle speed must also be established.
DTC P2647

Step Action Values Yes No
Connector End View Reference: Powertrain Control Module 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
2 
  1. Install a scan tool.
  2. Start the engine.
  3. Observe the Intake Rocker Arm Actuator Oil Pressure Switch parameter on the scan tool.
Is the oil pressure switch indicating ON?		 - Go to Step 4  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. Operate the vehicle within the Freeze Frame conditions as specified or within the Conditions for Running the DTC.
Did a DTC P2647 set?		 - Go to Step 4  Go to Intermittent Conditions
4 
  1. Turn OFF the ignition.
  2. Disconnect the electrical connector of the rocker arm oil pressure switch.
  3. Measure the resistance of the rocker arm oil pressure switch.
Is the resistance less than the specified value?		 3 Ω Go to Step 5  Go to Step 12 
5
  1. Connect a DMM to the signal circuit of the oil pressure switch and a good ground.
  2. Turn ON the ignition, with the engine OFF.
Is the signal circuit voltage more than the specified value?		 6.9 V Go to Step 6  Go to Step 7 
6
  1. Test for an open or high resistance in the ground circuit of the rocker arm oil pressure switch.
  2. Inspect for poor electrical connections at the rocker arm oil pressure switch and G107. Refer to Testing for Intermittent Conditions and Poor Connections .
  3. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct a condition?		 - Go to Step 15  Go to Step 8 
7
  1. Test for an open in the input circuit of the rocker arm oil pressure switch.
  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct a condition?		 - Go to Step 15  Go to Step 13 
8 
  1. Remove the oil pressure switch.
  2. Install the EN 46332  Oil Pressure Gage Adapter to the engine. See Special Tools .
  3. Install the oil pressure gage from the SA9127E  Bar Gage Set to the adapter.
  4. Install the oil pressure switch to the adapter.
  5. Start the engine.
Is the oil pressure indicated on the oil pressure gage more than the specified value?		 49 kPa (7 psi) Go to Step 9  Go to Step 11 
9
  1. Inspect for any of the following conditions:
    • A stuck or binding spool valve
    • A damaged and leaking spool valve
    • A broken spool valve spring
  2. Repair any condition as necessary.
Did you find and correct a condition?		 - Go to Step 15  Go to Step 10 
10 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  -
11 Inspect for poor electrical connections at the rocker arm oil pressure switch. Refer to Testing for Intermittent Conditions and Poor Connections .
Did you find and correct a condition?		 - Go to Step 15  Go to Step 13 
12 Replace the rocker arm oil pressure switch. Refer to Rocker Arm Oil Pressure Switch Replacement .
Did you complete the replacement?		 - Go to Step 15  -
13 Inspect for poor electrical connections at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections .
Did you find and correct a condition?		 - Go to Step 15  Go to Step 14 
14 
  1. Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
  2. Perform the idle learn procedure. Refer to Idle Learn .
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 - Vehicle System OK
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