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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 P2127: Accelerator Pedal Position Sensor No. 2 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. Classify APP Sensor Or Harness Malfunction -  Connect WDS or equivalent. Access APP2 PID. Disconnect APP sensor 6-pin harness connector. Connect a jumper wire between APP sensor 6-pin harness connector terminal "A" (Red/Block wire) and "C" (Blue/Yellow wire). See Fig 1. If PID value is about 100 percent, go to next step. If PID value is not about 100 percent, go to step  5.
    Fig 1: Identifying Accelerator Pedal Position Sensor Circuits & Harness Connector Terminals
    G00221526Courtesy of MAZDA MOTORS CORP.
  4. 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  8.
  5. Inspect Power Supply Circuit Voltage At APP Sensor Connector -  Turn ignition on, engine off. Measure voltage at APP sensor 6-pin harness connector terminal "A" (Red/Black wire). If voltage reading is 4.5-5.5 volts, go to next step. If voltage reading is not 4.5-5.5 volts, repair open circuit in Red/Black wire between APP sensor 6-pin harness connector terminal "A" and PCM 30-pin harness connector terminal "2K" or replace wire harness. After repair, go to step  8.
  6. Verify APP2 Signal Circuit For Open Circuit -  Turn ignition off. Check for continuity Blue/Yellow wire between APP sensor 6-pin harness connector terminal "C" and PCM 30-pin harness connector terminal "2A". See Fig 1. If continuity is present, go to next step. If continuity is not present, repair open circuit 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  8.
  7. Verify APP2 Signal Circuit For Short To Ground -  Check for continuity between APP sensor 6-pin harness connector terminal "C" (Blue/Yellow wire) and body ground. If continuity is not present, go to next step. If continuity is present, repair short circuit to ground 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. After repair, go to next step.
  8. Verify Trouble Shooting Of DTC P2127 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.
  9. 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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