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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls [Self-Diagnostics 3.0L]) >> Diagnostic Tests >> DTC P2228: EGR Boost Sensor Circuit - Low Input >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
  2. Verify Related Repair Information Availability -  Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
  3. Inspect EGR Boost Sensor Connector For Poor Connection -  Turn ignition off. Disconnect EGR boost sensor 3-pin harness connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). If malfunction is not present, go to next step. If malfunction is present, repair or replace terminal. After repair, go to step  9.
  4. Inspect EGR Boost Sensor Power Circuit For Open Circuit -  Turn ignition on, engine off. Measure voltage between EGR boost sensor 3-pin harness connector terminal "C" (Red/Black wire) and body ground. See Fig 1. If voltage reading is present, go to next step. If no voltage is present, repair open circuit in Red/Black wire between EGR boost sensor 3-pin harness connector terminal "C" and PCM 104-pin harness connector terminal No. 90 or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  9.
    Fig 1: Identifying EGR Boost Sensor Circuits & Harness Connector Terminals
    G00256843Courtesy of MAZDA MOTORS CORP.
  5. Inspect EGR Boost Sensor Signal Circuit For Short To Ground -  Turn ignition off. Check for continuity between EGR boost sensor 3-pin harness connector terminal "A" (Pink wire) and body ground. If no continuity is present, go to next step. If continuity is present, repair short circuit to ground in Pink wire between EGR boost sensor 3-pin harness connector terminal "A" and PCM 104-pin harness connector terminal No. 34 or replace wire harness. After repair, go to step  9.
  6. Inspect EGR Boost Sensor -  Inspect EGR boost sensor. Refer to EGR BOOST SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If EGR boost sensor is okay, go to next step. If EGR boost sensor is faulty, replace EGR boost sensor. After repair, go to step  9.
  7. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 104-pin harness connector. Inspect for poor connection (such as damaged, pulled-out terminals or corrosion). If malfunction is not present, go to next step. If malfunction is present, repair or replace terminal. After repair, go to step  9.
  8. Inspect EGR Boost Sensor Signal Circuit For Open Circuit -  Turn ignition off. Check for continuity in Pink wire between EGR boost sensor 3-pin harness connector terminal "A" and PCM 104-pin harness connector terminal No. 34. See Fig 1. If continuity is present, go to next step. If continuity is not present, repair open circuit in Pink wire between EGR boost sensor 3-pin harness connector terminal "A" and PCM 104-pin harness connector terminal No. 34 or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to next step.
  9. Verify Trouble Shooting Of DTC P2228 Is Completed -  Make sure to reconnect all disconnected connectors. Turn ignition on, engine off. Clear DTC from PCM memory using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and run at idle. If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
  10. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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