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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 59 (Engine Controls [Self-Diagnostics 3.0L]) >> Diagnostic Tests >> DTC P2122: Accelerator Pedal Position Sensor No. 1 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 APP Sensor Connector For Poor Connection -  Turn ignition off. Disconnect APP sensor 6-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 APP Sensor No. 1 Power Circuit For Open Circuit -  Turn ignition on, engine off. Measure voltage between APP sensor 6-pin harness connector terminal "D" (Gray wire) and body ground. See Fig 1. 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 Gray wire between APP sensor 6-pin harness connector terminal "D" and PCM 104-pin harness connector terminal No. 43 or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  9.
    Fig 1: Identifying Accelerator Pedal Position Sensor No. 1 Circuits & Harness Connector Terminals
    G00256841Courtesy of MAZDA MOTORS CORP.
  5. Verify APP Sensor No. 1 Signal Circuit For Short To Ground -  Turn ignition off. Check for continuity between APP sensor 6-pin harness connector terminal "F" (White wire) and body ground. If no continuity is present, go to next step. If continuity is present, repair short circuit to ground in White wire between APP sensor 6-pin harness connector terminal "F" and PCM 104-pin harness connector terminal No. 9 or replace wire harness. After repair, go to step  9.
    NOTE: APP sensor is an integral part of the accelerator pedal and must be replaced as an assembly.
  6. Inspect APP Sensor No. 1 -  Inspect APP sensor No. 1. Refer to ACCELERATOR PEDAL POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If no malfunction is present, go to next step. If APP sensor No. 1 is faulty, replace accelerator pedal assembly. 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. Verify APP Sensor No. 1 Signal Circuit For Open Circuit -  Turn ignition off. Check for continuity between APP sensor 6-pin harness connector terminal "F" (White wire) and PCM 104-pin harness connector terminal No. 9. See Fig 1. 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 104-pin harness connector terminal No. 9 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 P2122 Is Completed -  Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Turn ignition on, engine off. 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.
  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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