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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 69 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0703, DTC P1572 Or DTC P1703 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed and brake pedal was applied during KOEO self-test, perform KOEO self-test again and avoid applying brake pedal during test. If brake pedal was not applied and released during KOER self-test, perform KOER self-test again and ensure brake pedal is applied and released. For KOEO DTC P0703, P1572 or P1703, go to step next step. For KOER DTC P0703, P1572 or P1703, go to step  3.
  2. DTCS P0703 & P1703: Check Operation Of Stoplamps -  Apply and release brake pedal several times and observe stop lamp operation. If stop lamps operate normally, go to next step. If stop lamps are never on, go to step  4. If stop lamps are always on, go to step  6.
  3. Check For PCM BPP/BOO PID Cycling -  Turn ignition on, engine off. Access BPP/BOO PID with scan tool. Apply and release brake pedal several times while viewing BPP/BOO PID. If BPP/BOO PID cycles ON/OFF, problem is intermittent. Refer to INTERMITTENT  testing under SYSTEM TESTS. If BPP/BOO PID does not cycle ON/OFF, go to step  9.
    4. NOTE: Check the condition of the stop lamp bulbs before starting this test.
  4. Check For Power To BPP Switch -  Disconnect BPP switch 2-pin harness connector. Measure B+ input voltage between chassis ground and BPP switch harness connector (Light Green/Red wire). If voltage reading is more than 10 volts, go to next step. If voltage reading is not as specified, verify integrity of No. 24 fuse (15-amp) for B+ to BPP switch. If okay, repair open in B+ circuit (Light Green/Red wire). If No. 24 fuse (15-amp) is damaged, check for short to ground B+ circuit (Light Green/Red wire), BPP circuit (Light Green wire), stop lamp PWR circuit (light Green wire) and any other associated circuits. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. Repair as necessary. After repair, go to step  10.
  5. Verify Integrity Of BPP Switch -  Connect DVOM test probes to BPP switch terminals. Apply brake pedal while monitoring resistance reading. If resistance reading is less than 5 ohms, repair open circuit between BPP switch and stop lamp ground. After repair, go to step  10. If resistance reading is not as specified, replace BPP switch. After repair, go to step  10.
  6. Verify BPP Switch Is Not Always Closed -  Turn ignition off. Disconnect BPP switch harness connector. Turn ignition on, engine off. If stop lamps are still on, go to next step. If stop lamps are not on, ensure BPP switch is installed correctly. If BPP switch is installed correctly, replace BPP switch. After repair, go to step  10.
  7. Check For Short To Power In PCM -  Turn ignition off. Disconnect PCM 104-pin harness connector. Turn ignition on, engine off. If stop lamps are still on, go to next step. If stop lamps are not on, replace PCM. After repair, go to step  10.
  8. Check Stop Lamp Circuit For Short To Power In Harness -  One at a time, disconnect all modules associated with stop lamp circuit (PCM, cruise control, GEM, 4WABS and RABS). See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After disconnecting each module, turn ignition on and observe stop lamps. Turn ignition off. Repeat until each associated module has been disconnected or stop lamps turn off. If stop lamps turned off when any modules were disconnected, go to appropriate MODULE COMMUNICATIONS NETWORK article in ACCESSORIES & EQUIPMENT.
  9. Check For BPP Circuit Cycling -  Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure voltage between breakout box terminals No. 92 (BPP) and No. 76 (PWR GND) while applying and releasing brake pedal. If voltage reading cycles, replace PCM. After repair, go to next step. If voltage reading does not cycle, repair open in BPP circuit (Light Green wire) to PCM 104-pin harness connector terminal No. 92. After repair, go to next step.
  10. Verify Trouble Shooting Of DTCs Completed -  Reconnect all disconnected connectors. Clear DTCs from PCM memory using scan tool. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is not present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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