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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 P0571: Brake Switch Circuit - Malfunction >> 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 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  10.
  4. 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 next step. If brake switch is faulty, replace brake switch. After repair, go to step  10.
  5. Inspect GND Circuit Of Brake Switch No. 2 For Open Circuit -  Check for continuity between brake switch 4-pin harness connector terminal "C" (Black/Orange wire) and body ground. See Fig 1. If continuity is present, go to next step. If continuity is not present, repair open circuit in Black/Orange wire between brake switch 4-pin harness connector terminal "C" and ground terminal. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  10.
    Fig 1: Identifying Brake Switch Circuits & Harness Connector Terminals
    G00221515Courtesy of MAZDA MOTORS CORP.
  6. Inspect Signal Circuit Of Brake Switch No. 2 For Short To Ground -  Check for continuity between brake switch 4-pin harness connector terminal "A" (Green/Orange wire) and body ground. If continuity is not present, go to next step. If continuity is present, repair short circuit in Green/Orange wire between brake switch 4-pin harness connector terminal "A" and PCM 27-pin harness connector terminal "3T". After repair, go to step  10.
  7. 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  10.
  8. Inspect Signal Circuit Of Brake Switch No. 2 For Open Circuit -  Check for continuity in Green/Orange wire between brake switch 4-pin harness connector terminal "A" and PCM 27-pin harness connector terminal "3T". See Fig 1. If continuity is present, go to next step. If continuity is not present, repair open circuit in Green/Orange wire between brake switch 4-pin harness connector terminal "A" and PCM 27-pin harness connector terminal "3T". See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  10.
  9. Inspect Signal Circuit Of Brake Switch No. 2 For Short To Power -  Turn ignition on, engine off. Measure voltage between brake switch terminal "A" (Green/Orange wire) and body ground. If battery voltage is present, repair short circuit to power in Green/Orange wire between brake switch 4-pin harness connector terminal "A" and PCM 27-pin harness connector terminal "3T". After repair, go to next step.
  10. Verify Trouble Shooting Of DTC P0571 Is Completed -  Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. Turn ignition on, engine off. Depress and release brake pedal more than 5 times. 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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