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Home >> Mazda >> 2003 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0107: BARO Circuit - Low Input >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify Related Repair Information Availability -  Turn ignition off. Connect scan tool to DLC-2. Turn ignition on, engine off. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step  6.
  2. Check Signal Circuit Voltage When EGR Boost Sensor Connector Is Disconnected -  Disconnect EGR boost sensor 3-pin harness connector. Turn ignition on, engine off. Measure voltage between ground and EGR boost sensor 3-pin harness connector terminal "A" (Red/Blue wire). See Figure. If voltage reading is more than 4.9 volts, go to next step. If voltage reading is not as specified, go to step  4.
    NOTE: If DTC P0122 and P0452 are present with P0107, go to REFERENCE VOLTAGE TEST .
  3. Check Power Supply Circuit Voltage At EGR Boost Sensor Connector -  Turn ignition on, engine off. Measure voltage between ground and EGR boost sensor 3-pin harness connector terminal "C" (Pink/Black wire). See Figure. If 4.5-5.5 volts are present, check for poor connection due to damaged, pulled-out terminals, corrosion, etc. Repair or replace terminals as necessary. If terminals are okay, replace EGR boost sensor. After repair, go to step  6. If 4.5-5.5 volts are not present, repair open circuit in Pink/Black wire between EGR boost sensor 3-pin harness connector terminal "C" and PCM 104-pin harness connector terminal No. 90. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  6.
  4. Inspect EGR Boost Sensor Signal Circuit For Short To Ground -  Turn ignition off. Disconnect PCM 104-pin harness connector. Check continuity between EGR boost sensor 3-pin harness connector terminal "A" (Red/Blue wire) and ground. See Figure. If continuity is not present, go to next step. If continuity is present, repair short circuit to ground in Red/Blue wire between EGR boost sensor 3-pin harness connector terminal "A" and PCM 104-pin harness connector terminal No. 34. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. Go to next step.
  5. Inspect EGR Boost Sensor Signal & Ground Circuit For Intermediate Short -  Check continuity between EGR boost sensor 3-pin harness connector terminals "A" (Red/Blue wire) and "B" (Orange wire). If continuity is not present, go to next step. If continuity is present, repair short between circuits. After repair, go to next step.
  6. Verify Trouble Shooting Of DTC P0107 Completed -  Reconnect all connectors. Turn ignition on, engine off. Clear DTC from memory. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0107 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. After repair, go to next step. If same DTC P0107 is not present, go to next step.
  7. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, follow appropriate DTC diagnostic procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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