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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 60 (Engine Controls [Self-Diagnostics 2.3L]) >> Diagnostic Tests >> DTC P2123: Accelerator Pedal Position Sensor No. 1 Circuit - High 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 APP Sensor Connector -  Turn ignition off. Verify APP sensor harness connector is connected securely. If connector is okay, go to next step. If connector is loose, reconnect connector securely. After repair, go to step  11.
  4. Inspect APP Sensor Connector For Poor Connection -  Disconnect APP sensor connector. Inspect for poor connection (such as damaged, pulled-out terminals, corrosion). If any malfunction is present, repair or replace suspected terminal. After repair, go to step  11.
  5. Inspect APP Sensor -  Perform APP sensor inspection. Refer to ACCELERATOR PEDAL POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If APP sensor is okay, go to next step. If APP sensor is faulty, replace APP sensor. After repair, go to step  11.
  6. Inspect APP1 Signal Circuit For Short To Power -  Turn ignition on, engine off. Measure voltage between APP sensor 6-pin harness connector terminal "F" (White wire) and body ground. See Figure. If voltage reading more than 4.9 volts, repair or replace short circuit to power in White wire between APP sensor 6-pin harness connector terminal "F" and PCM 27-pin harness connector terminal "3D". See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  11.
  7. Verify APP Sensor Ground Circuit For Open Circuit -  Disconnect PCM 27-pin harness connector. Check for continuity in Red/Green wire between APP sensor 6-pin harness connector terminal "E" and PCM 27-pin harness connector terminal "3A". If continuity is present, go to next step. If continuity is not present, repair open circuit in Red/Green wire between APP sensor 6-pin harness connector terminal "E" and PCM 27-pin harness connector terminal "3A" or replace wire harness. After repair, go to step  11.
  8. Verify APP Sensor Signal Circuit For Open Circuit -  Disconnect PCM 27-pin harness connector. Check for continuity in White wire between APP sensor 6-pin harness connector terminal "F" and PCM 27-pin harness connector terminal "3D". If continuity is present, go to next step. If continuity is not present, repair open circuit in White wire between APP sensor 6-pin harness connector terminal "F" and PCM 27-pin harness connector terminal "3D" or replace wire harness. After repair, go to step  11.
  9. Inspect PCM Connector For Poor Connection -  Inspect for poor connection (such as damaged, pulled-out terminals, corrosion). If terminals are okay, go to next step. If malfunction is present, repair or replace terminal. After repair, go to step  11.
  10. Verify APP Sensor Signal Circuit For Short To Constant Voltage Circuit -  Check for continuity between APP sensor 6-pin harness connector terminal "D" (Blue/Yellow wire) and terminal "F" (White wire). See Figure. If continuity is not present, go to next step. If continuity is present, repair short circuit in wire harness between APP sensor 6-pin harness connector and PCM 27-pin harness connector or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to next step.
  11. Verify Trouble Shooting Of DTC P2123 Is Completed -  Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. Turn ignition off. Start engine and warm up completely. If same DTC is not present, go to next step. If 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.
  12. 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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