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Home >> Chevrolet >> 2003 >> Tracker 2D Utility, 4WD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 2.0L >> Diagnostic Tests >> DTC P0403: EGR Solenoid Control Circuit >> Test Description

Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 1 -  The Diagnostic System Check - Engine Controls prompts the technician to complete some basic checks and to 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 the ignition positive voltage supply to the EGR coils.
  3. 4 -  This step tests the operation of the EGR valve. If the EGR valve responds to commands from the scan tool and the engine reacts to the valve opening, the system is operating normally at this time.
  4. 5 -  This step determines which EGR coil control circuits may be at fault. If a DTC P0403 resets within one minute, the circuits referred to in step  8 or the PCM are at fault. If DTC P0403 DOES NOT reset within one minute, the circuits referred to in step  6 or the PCM are at fault.
  5. 11 -  Clearing the DTCs by removing the DOME fuse also clears the PCM long term memory. Using the scan tool to clear DTCs leaves the long term memory active. DTC emitting diagnostics may not run to completion as expected unless the long term memory is cleared. Removal of DOME fuse also clears the time display of the radio. The DTC P0403 diagnostic can be monitored on the scan tool under the Not Ran Since Code Cleared selection in the DTC Information menu. If a DTC P0403 appears in the Not Ran Since Code Cleared list, the DTC P0403 diagnostic has not yet run. When the DTC P0403 does not appear in the Not Ran Since Code Cleared list, the DTC P0403 diagnostic has run. If the MIL is NOT illuminated, and there is no Pending DTC Status in DTC Information, the DTC P0403 diagnostic has passed. The DTCs MUST be cleared in order to view the Current Status of the Not Ran Since Code Cleared list. DO NOT forget that the Not Ran Since Code Cleared list only indicates that the test has run, not whether the test passed or failed. The DTC Information screen must be checked for Current or Pending status, in order to determine the outcome of the diagnostic test involved.
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