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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 P0403 >> 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. 5:  This step checks for an open in the EGR solenoid control circuit. The PCM provides a 12 volt bias signal on the solenoid control circuit that is pulled low when the solenoid is OK and has a good ground.
  2. 6:  This step tests whether the PCM is actually commanding ON the EGR valve.
  3. 12:  After replacing the PCM a new minimum throttle position and idle speed must be established.
DTC P0403

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. Start and run the engine until the coolant temperature is 85°C (185°F).
  2. Command the exhaust gas recirculation (EGR) from 0 percent to 100 percent with a scan tool. Refer to Scan Tool Output Controls .
  3. Observe the EGR position sensor parameter with the scan tool.
Is the EGR Sensor parameter within the specified value?		 3.0-3.2 V 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. 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 4  Go to Intermittent Conditions
4
  1. Turn OFF the ignition.
  2. Disconnect the EGR valve.
  3. Measure the resistance of the EGR solenoid with a DMM.
Is the solenoid resistance within the specified value?		 6.3-7.0 Ω at 20°C (68°F) Go to Step 5  Go to Step 11 
5 
  1. Connect the DMM to the EGR solenoid control circuit and ground.
  2. Turn ON the ignition, with the engine OFF.
Is the voltage near the specified value?		 12 V Go to Step 6  Go to Step 7 
6 
  1. Connect a test lamp between the EGR solenoid control circuit and the EGR solenoid ground circuit.
  2. Command the EGR valve from 0-100 percent with the scan tool.
Does the test lamp illuminate?		 - Go to Step 9  Go to Step 8 
7 Test the EGR solenoid high control circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 13  Go to Step 10 
8 Test the EGR solenoid ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct a condition?		 - Go to Step 13  Go to Step 12 
9 Test for an intermittent and for a poor connection at the EGR valve. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 13  Go to Step 11 
10 Test for an intermittent and for a poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 13  Go to Step 12 
11 Replace the EGR valve. Refer to Exhaust Gas Recirculation Valve 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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