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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 High Input Or Low Input -  Connect WDS or equivalent to DLC-2. Access BOO PID. Verify BOO PID during brake pedal operation. If BOO PID is always OFF, go to next step. If BOO PID is not always OFF, go to step  10
  4. Inspect Brake Switch Connector For Poor Connection -  Turn ignition off. Disconnect brake switch 4-pin harness connector. Inspect for poor connection (such as damaged, pulled-out terminals, corrosion). If there are no malfunctions, go to next step. If there are any malfunctions, repair or replace suspected terminal. After repair, go to step  14.
  5. Classify Brake Switch Or Circuit -  Connect WDS or equivalent to DLC-2. Access BOO PID. Connect fused jumper wire between brake switch terminal "A" (Green/Orange wire) and terminal "B" (Green/White wire). If BOO PID is ON, go to next step. If BOO PID is OFF, go to step  7.
  6. Inspect Brake Switch -  Inspect brake switch. Refer to BRAKELIGHT SWITCH under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If brake switch is okay, go to step  14. If brake switch is faulty, replace brake switch. After repair, go to step  14.
  7. Inspect Brake Switch Power Circuit For Open Circuit -  Measure voltage between brake switch 4-pin harness connector terminal "B" (Green/White wire) and body ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open circuit in Green/White wire between brake switch 4-pin harness connector terminal "B" and positive battery terminal. After repair, go to step  14.
  8. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM harness connectors. Inspect for poor connection (such as damaged, pulled-out terminals, corrosion). If connections are okay, go to next step. If any malfunctions are present, repair or replace faulty terminal. After repair, go to step  14.
  9. Inspect Brake Switch Signal Circuit For Open Circuit -  Check for continuity in Green/Yellow wire between brake switch 4-pin harness connector terminal "D" and PCM 30-pin harness connector terminal "1K". If continuity is present, go to next step. If continuity is not present, repair open circuit in Green/Yellow wire between brake switch 4-pin harness connector terminal "D" and PCM 30-pin harness connector terminal "1K". After repair, go to step  14.
  10. Inspect Brake Switch Connector For Poor Connection -  Turn ignition off. Disconnect brake switch 4-pin harness connector. Inspect for poor connection (such as damaged, pulled-out terminals, corrosion). If there are no malfunctions, go to next step. If there are any malfunctions, repair or replace suspected terminal. After repair, go to step  14.
  11. Classify Brake Switch Or Circuit -  Connect WDS or equivalent to DLC-2. Access BOO PID. Verify that BOO PID changes from ON to OFF when brake switch 4-pin harness connector is disconnected. If BOO PID changes from ON to OFF, go to next step. If BOO PID does not change from ON to OFF, go to step  13.
  12. Inspect Brake Switch -  Inspect brake switch. Refer to BRAKELIGHT SWITCH under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If brake switch is okay, go to step  14. If brake switch is faulty, replace brake switch. After repair, go to step  14.
  13. Inspect Brake Switch Signal Circuit For Short To Power -  Measure voltage between brake switch 4-pin harness connector terminal "D" (Green/Yellow wire) and body ground. See Figure. If battery voltage is not present, go to next step. If battery voltage is present, repair short circuit to power in Green/Yellow wire between brake switch 4-pin harness connector terminal "D" and PCM 30-pin harness connector terminal "1K". See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to next step.
  14. Verify Trouble Shooting Of DTC P0703 Is Completed -  Make sure to reconnect all disconnected connectors. Clear DTC from memory using WDS or equivalent. Drive vehicle at 18.6 MPH or more. Depress and release brake pedal more than 8 times while driving vehicle. 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.
  15. 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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