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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 P2128: Accelerator Pedal Position Sensor No. 2 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 connector is connected securely. If connector is okay, go to next step. If connector is loose, reconnect connector securely. After repair, go to step  10.
  4. Inspect APP Sensor Connector For Poor Connection -  Disconnect APP sensor 6-pin harness connector. Inspect for poor connection (such as damaged, pulled-out terminals, corrosion). If malfunction is not present, go to next step. If any malfunction is present, repair or replace terminal. After repair, go to step  10.
  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  10.
  6. Inspect APP2 Signal Circuit For Short To Power -  Turn ignition on, engine off. Measure voltage between APP sensor 6-pin harness connector terminal "C" (Blue/Yellow wire) and body ground. See Figure. If voltage reading is not more than 4.9 volts, go to next step. If voltage reading is more than 4.9 volts, repair short circuit to power in Blue/Yellow wire between APP sensor 6-pin harness connector terminal "C" and PCM 30-pin harness connector terminal "2A" or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  10.
  7. Verify APP Sensor Ground Circuit For Open Circuit -  Disconnect PCM harness connectors. Check for continuity in Brown wire between APP sensor 6-pin harness connector terminal "B" and PCM 30-pin harness connector terminal "2H". If continuity is present, go to next step. If continuity is not present, repair open circuit in Brown wire between APP sensor 6-pin harness connector terminal "B" and PCM 30-pin harness connector terminal "2H" or replace wire harness. After repair, go to step  10.
  8. Inspect PCM Connector For Poor Connection -  Inspect for poor connection (such as damaged, pulled-out terminals, corrosion). If malfunction is not present, go to next step. If any malfunction is present, repair or replace suspected terminal. After repair, go to step  10.
  9. Verify APP Signal Circuit For Short To Constant Voltage Circuit -  Check for continuity between APP sensor 6-pin harness connector terminal "A" (Red/Black wire) and terminal "C" (Blue/Yellow wire). See Figure. If continuity is not present, go to next step. If continuity is present, repair short between circuits in wire harness or replace wire harness. After repair, go to next step.
  10. Verify Trouble Shooting Of DTC P2128 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.
  11. 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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