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Exhaust Gas Recirculation System Check

WARNING: This page is about a different car, the 2002 Isuzu Trooper, 2002 Isuzu Rodeo Sport, 2002 Isuzu Rodeo, 2002 Isuzu Axiom, and 2002 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check EGR valve for looseness. If EGR valve is loose, tighten fasteners as necessary. If no problem is found, go to next step.
  2. Start engine, and run until engine is at normal operating temperature. Connect Tech 2 or equivalent scan tool to Data Link Connector (DLC). DLC is located under small cover on lower left side of instrument panel. On scan tool, select MISCELLANEOUS TESTS and then EGR TEST. Using scan tool, command EGR valve 50 percent On. If engine begins to run roughly and loses RPM, testing is complete. If engine does not perform as specified, go to next step.
  3. Turn ignition off. Disconnect EGR valve 5-pin harness connector. Using test light connected to ground, probe EGR valve ignition feed circuit. See IDENTIFYING EGR VALVE IGNITION CIRCUITS table. If test light illuminates, go to step  5. If test light does not illuminate, go to next step.
    IDENTIFYING EGR VALVE IGNITION CIRCUITS

    Model Terminal No. (Wire Color)
    Except Trooper 4 (Gray/Red)
    Trooper 4 (Red/Blue)
  4. Repair open or short to ground in EGR valve ignition feed circuit between PCM and EGR valve. See WIRING DIAGRAMS article. After repair, repeat step  2.
  5. Remove EGR valve. Check EGR pintle, valve passages and adapter for excessive deposits, obstructions or restrictions. If problem is found, go to next step. If no problem is found, go to step  7.
  6. Clean or replace EGR valve or components as necessary. After repair, go to next step.
  7. Holding EGR valve case to ground. Using scan tool, command EGR ON. Observe EGR valve pintle for movement. If EGR pintle moves as commanded, go to next step. If EGR pintle does not move as commanded, perform DTC P1406 in SELF-DIAGNOSTICS - TROOPER 3.5L or SELF-DIAGNOSTICS - AXIOM 3.5L, PASSPORT, RODEO & RODEO SPORT 3.2L article. For Rodeo and Rodeo Sport 2.2L, perform DTC P0404 in SELF-DIAGNOSTICS - RODEO & RODEO SPORT 2.2L .
  8. Remove EGR inlet and outlet pipes from intake and exhaust manifolds. Check for excessive deposits, obstructions or restrictions. If problem is found, clean or replace EGR valve or components as necessary. After repair, repeat step  2.
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