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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 P0641 >> 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. 12:  After replacing the PCM a new minimum throttle position and idle speed must also be established.
DTC P0641

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. Observe the Freeze Frame/Failure Records for this DTC.
  2. Clear the DTC information with a scan tool.
  3. Turn OFF the ignition for 30 seconds.
  4. Start the engine.
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Does the DTC fail this ignition?		 - Go to Step 3  Go to Diagnostic Aids
3
  1. Turn OFF the ignition.
  2. Disconnect the manifold absolute pressure (MAP) sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the 5-volt reference circuit of the MAP sensor to a good ground with a DMM.
Is the voltage within the specified range?		 4.8-5.2 V Go to Step 9  Go to Step 4 
4 Is the voltage measured in step 3 more than the specified value? 5.2 V Go to Step 8  Go to Step 5 
5
  1. Disconnect the accelerator pedal position (APP) sensor.
  2. Measure again the voltage from the 5-volt reference circuit of the MAP sensor to a good ground with the DMM.
Is the voltage within the specified range?		 4.8-5.2 V Go to Step 10  Go to Step 6 
6
  1. Disconnect the automatic transmission output shaft speed (AT OSS) sensor.
  2. Measure again the voltage from the 5-volt reference circuit of the MAP sensor to a good ground with the DMM.
Is the voltage within the specified range?		 4.8-5.2 V Go to Step 11  Go to Step 7 
7
  1. Turn OFF the ignition.
  2. Disconnect the powertrain control module (PCM).
  3. Test all of the 5-volt reference 1 circuits for a short to ground. Refer to Circuit Testing .
  4. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 13  Go to Step 12 
8
  1. Turn OFF the ignition.
  2. Disconnect the PCM.
  3. Turn ON the ignition, with the engine OFF.
  4. Test all 5-volt reference 1 circuits for a short to voltage. Refer to Circuit Testing .
  5. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 13  Go to Step 12 
9 Replace the MAP sensor. Refer to Manifold Absolute Pressure Sensor Replacement .
Did you complete the replacement?		 - Go to Step 13  -
10 Replace the APP sensor. Refer to Accelerator Pedal Position Sensor Replacement .
Did you complete the replacement?		 - Go to Step 13  -
11 Replace the AT OSS sensor. Refer to Output Speed Sensor Replacement .
Did you complete the replacement?		 - Go to Step 13  -
12 
  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 13  -
13
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 14 
14 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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