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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 P0123: Throttle Position Sensor - 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 Throttle Body Connector -  Turn ignition off. Verify throttle body 6-pin harness connector is connected securely. If connector is okay, go to next step. If connector is loose, reconnect connector. After repair, go to step  10.
  4. Inspect Throttle Body Connection For Poor Connection -  Disconnect throttle body 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 malfunction is present, repair or replace suspected terminal. After repair, go to step  10.
  5. Inspect TP Sensor -  Turn ignition off and remove fused jumper wire. Check TP sensor operation. See THROTTLE POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If TP sensor is okay, go to next step. If TP sensor is faulty, replace throttle body. After repair, go to step  10.
  6. Inspect TP1 Signal Circuit For Short To Power -  Turn ignition on, engine off. Measure voltage between throttle body 6-pin harness connector terminal "A" (Brown 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 to power circuit between 6-pin harness connector terminal "A" (Brown wire) and PCM 27-pin harness connector terminal "3M" (Brown/Yellow wire). See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  10.
  7. Verify TP Sensor Ground Circuit For Open Circuit -  Check continuity between throttle body 6-pin harness connector terminal "D" (White/Blue wire) and body ground. If continuity is present, repair or replace open circuit between throttle body 6-pin harness connector terminal "D" (White/Blue wire) and PCM 27-pin harness connector terminal "3K" (Pink/Blue wire). After repair, go to step  10.
  8. Inspect PCM Connector For Poor Connection -  Disconnect PCM harness connectors. Inspect for poor connection (such as damaged, pulled-out terminals, corrosion). If malfunction is present, repair terminal. After repair, go to step  10. If malfunction is not found, go to next step.
  9. Verify TP Signal Circuit For Short To Constant Voltage Circuit -  Inspect continuity between throttle body 6-pin harness connector terminal "A" (Brown wire) and "B" (White wire). See Figure. If continuity is present, repair or replace suspected harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to next step.
  10. Verify Trouble Shooting Of DTC P0123 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 it up completely. If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of 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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