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Home >> Chevrolet >> 2003 >> Tracker 2D Utility, 4WD, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System Self-Diagnostics - 2.5L) >> Diagnostic Tests >> DTC P0403: EGR Solenoid Control Circuit >> Diagnostic Procedures
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Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Disconnect the EGR valve electrical connector. Turn ignition on, with engine off. Connect a test light between the harness side of terminal 2 and ground. Connect a test light between the harness side of terminal 5 and ground. Does the test light illuminate on both circuits? If yes, go to next step. If no, go to step  6 .
  3. Using DVOM, check resistance between EGR harness connector terminals No. 1 and 2, terminals No. 2 and 3, terminals No. 5 and 6, terminals No. 4 and 5. Resistance should be 20-24 ohms at 68°F (20°C). Check resistance between EGR valve body and EGR valve terminals No. 2 and 5. Resistance should be infinite. Does the EGR valve pass all the resistance tests? If yes, go to next step. If no, go to step  7 .
  4. Connect the EGR valve electrical connector. Install a scan tool. Start engine. Operate the engine until the engine reaches a normal operating temperature. Perform the scan tool Clear DTC Information function. Using the scan tool, gradually command the EGR valve open to 100 percent. Does the engine run rough or stall? If yes, go to DIAGNOSTIC AIDS  . If no, go to next step.
  5. Test the EGR coil control circuits for an open or a short circuit. Repair the open or the short in the EGR coil control circuit. Did you find and correct Condition? If yes, go to step  10 . If no, go to step  8 .
  6. Repair the open in the ignition positive voltage circuit. After repairs, go to step  10 .
  7. Replace EGR valve. After replacing EGR valve, go to step  10 .
  8. Inspect the PCM and the EGR sensor electrical connectors for poor connections. Repair as necessary. Did you find and correct Condition? If yes, go to step  10 . If no, go to next step.
  9. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  10. Turn ignition off. Remove DOME fuse for 30 seconds. Reinstall fuse. Reset radio clock time. Start engine and operate vehicle within the Conditions For Running the DTC or until DTC P0403 diagnostic test has run. See CONDITIONS FOR RUNNING DTC  . If DTC runs and passes, go to next step. If DTC resets, go to step  2 .
  11. Using scan tool, observe stored information and Capture Info. If scan tool displays any undiagnosed DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no other DTCs are displayed, system is okay.
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