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Home >> Isuzu >> 2000 >> Rodeo LSE, 2.2 D >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.2L >> Diagnostic Trouble Code Identification >> DTC P0406: EGR Sensor Circuit High >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic II (OBD-II) system check. See SELF-DIAGNOSTICS - INTRODUCTION article. Go to next step.
  2. Turn ignition on. Using scan tool, read and record FAILURE RECORDS data for DTC P0406. Clear DTC from PCM memory. Operate vehicle within conditions noted in FAILURE RECORDS data. Using scan tool, read specified DTC. If scan tool displays DTC P0406 RAN AND PASSED, see DIAGNOSTIC AIDS . If scan tool does not display DTC P0406 RAN AND PASSED, go to next step.
  3. Turn ignition off. Disconnect EGR valve harness connector. Turn ignition on. Using DVOM, check for voltage at ignition feed circuit terminal of EGR valve harness connector. If reading is about 12 volts, go to step  5. If reading is not about 12 volts, go to next step.
  4. Check for an open or shorted condition in the ignition feed circuit. Ensure ENGINE IG (15-amp) fuse is okay. Repair as necessary. Retest system. If an open or shorted condition does not exist, go to step  7.
  5. Using DVOM, check resistance of the EGR solenoid. If reading is less than 5 ohms, go to next step. If reading is greater than 5 ohms, go to step  14.
  6. Check EGR solenoid valve low circuit between EGR valve and PCM for an open or shorted condition. Repair as necessary. Retest system. If an open or shorted condition does not exist, go to step  15.
  7. Turn ignition off. Disconnect EGR valve harness connector. Turn ignition on. Observe EGR value on scan tool. If reading is zero volts and zero percent, go to step  9. If reading is not as specified, go to next step.
  8. Check EGR position feedback circuit between EGR sensor and PCM for an open or shorted condition. Repair as necessary. Retest system. If an open or shorted condition does not exist, go to step  15.
  9. Using DVOM, check for voltage on EGR 5-volt reference circuit at EGR harness connector. If reading is about 5 volts, go to step  11. If reading is not about 5 volts, go to next step.
  10. Check EGR valve 5-volt reference circuit between EGR valve and PCM for an open or shorted condition. Repair as necessary. Retest system. If an open or shorted condition does not exist, go to next step.
  11. Turn ignition off. Connect DVOM between 5-volt reference circuit and ground circuit terminals of EGR valve harness connector. Turn ignition on. If reading is about 5 volts, go to step  13. If reading is not about 5 volts, go to next step.
  12. Check EGR ground circuit for an open or shorted condition. Repair as necessary. Retest system. If ground circuit is okay, go to step  15.
  13. Turn ignition off. Using a fused jumper wire, connect 5-volt reference circuit and EGR feedback circuit terminals of EGR valve harness connector. Turn ignition on. Observe EGR value on scan tool. If reading is 5 volts and 100 percent, go to next step. If value is not as specified, go to step  15.
  14. Replace EGR valve. Retest system.
  15. Replace and reprogram PCM using required equipment. See PROGRAMMING .
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