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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1862 (Engine Controls And Fuel - 3.5L (L66) - DTC P0223 To DTC P0499) >> DTC P0443 >> 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. 2:  This step tests if the concern is active. The EVAP purge solenoid is pulse width modulated (PWM). Clicking should be heard or felt when the purge solenoid is commanded to 20 percent and should stop when the EVAP purge solenoid is commanded to 0 percent. The rate at which the solenoid cycles should increase as the commanded state is increased and decreased as the commanded state is decreased. Repeat the commands as necessary.
  2. 5:  This step tests if a ground is constantly being applied to the EVAP purge solenoid.
  3. 6:  This step verifies that the control module is providing ground to the EVAP purge solenoid.
  4. 13:  After replacing the PCM, a new minimum throttle position and idle speed must also be established.
DTC P0443

Step Action 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. Turn ON the ignition, with the engine OFF.
  2. Command the evaporative emission (EVAP) purge solenoid to 20 percent and then to 0 percent with a scan tool,
Do you hear or feel a clicking from the EVAP purge solenoid when the solenoid is commanded to 20 percent?		 Go to Step 3  Go to Step 4 
3
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Turn ON the ignition, with the engine OFF.
  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 4  Go to Intermittent Conditions
4
  1. Turn OFF the ignition.
  2. Disconnect the EVAP purge solenoid.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the ignition 1 voltage circuit of the EVAP purge solenoid with a test lamp that is connected to a good ground. Refer to Probing Electrical Connectors .
Does the test lamp illuminate?		 Go to Step 5  Go to Step 11 
5 
  1. Connect a test lamp between the control circuit of the EVAP purge solenoid and the ignition 1 voltage circuit of the EVAP purge solenoid.
  2. Command the EVAP purge solenoid to 0 percent with a scan tool.
Does the test lamp illuminate?		 Go to Step 8  Go to Step 6 
6  Command the EVAP purge solenoid to 20 percent with a scan tool.
Does the test lamp illuminate or pulse when the EVAP purge solenoid is commanded to 20 percent?		 Go to Step 9  Go to Step 7 
7 Test the control circuit of the EVAP purge solenoid for an open or short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 10 
8 Test the control circuit of the EVAP purge solenoid for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 13 
9 Test for an intermittent and for a poor connection at the EVAP purge solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 12 
10 Test for an intermittent and for a poor connection at the control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 13 
11 Repair the open or short to ground in the ignition 1 voltage circuit of the EVAP purge solenoid. Refer to Wiring Repairs .
Did you complete the repair?		 Go to Step 14  -
12 Replace the EVAP purge solenoid. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
Did you complete the replacement?		 Go to Step 14  -
13 
  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 14  -
14
  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 15 
15 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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