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Home >> Mazda >> 1997 >> MPV ES, 3.0 3 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Circuit Tests >> DTC P0703 - Brake Switch Malfunction >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Inspect all applicable harness connectors. Repair as needed. Turn ignition on. Access ECM harness connector. ECM is mounted to passenger floor, behind glove box. Using voltmeter, backprobe applicable ECM harness connector. Measure voltage between ground and terminal No. 1Q.
  2. Voltage should be less than 1 volt with brake pedal released or battery voltage with brake pedal depressed. If voltage is within specification, go to step 4). If voltage is not within specification, go to next step.
  3. Turn ignition off. Disconnect ECM harness connectors. Check continuity of White/Green wire between terminal No. 1Q on ECM connector and brake switch terminal. Repair as needed. If continuity exists, go to next step.
  4. Erase DTC. See CLEARING CODES  . If DTC is present, replace ECM. If DTC is not present, intermittent poor harness connection may have caused DTC to originally set.
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