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Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. 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:
    • If brake pedal was applied during KOEO Self-Test, perform KOEO again and avoid applying brake pedal during test.
    • If brake pedal was not applied and released during KOER Self-Test, perform KOER again and make sure to apply and release brake pedal.
    • For KOEO DTC P0703 or P1703, go to step  2 .
    • For KOER DTC P0703 or P1703, go to step  3 .

  2. DTCs P0703 & P01703: Check Operation Of Stoplights

    While observing stoplights, apply and release brake pedal several times. If stoplights operate normally, go to next step. If stoplights do not operate properly:
    • For stoplights inoperable, go to step  4 .
    • For stoplights always on, go to step  6 .

  3. Check For PCM BPP/BOO PID Cycling

    With KOEO, access BPP/BOO PID with scan tool. While observing BPP/BOO PID, apply and release brake pedal several times. If BPP/BOO cycles ON/OFF, go to INTERMITTENT  under SYSTEM TESTS. If BPP/BOO does not cycle ON/OFF, go to step  9 .
    NOTE: Before performing next test step, verify stoplight bulbs are okay.

  4. Check For Power To BPP Switch

    Disconnect BPP switch. Measure B+ input voltage between Fuse No. 9 at BPP switch and chassis ground. See Fig 1 . If voltage is more than 10 volts, go to step  5 . If voltage is 10 volts or less, verify integrity of Fuse No. 9 for B+ to BPP switch. If Fuse No. 9 is okay, repair open B+ circuit. If Fuse No. 9 is open, check B+ circuit, BPP circuit, stoplight PWR circuit and any other associated circuits for short to ground. See WIRING DIAGRAMS article. Repair as necessary. Go to step  10 .
    Fig 1: Identifying BPP Switch Circuits
    G00155550Courtesy of MAZDA MOTORS CORP.

  5. Verify Integrity Of BPP Switch

    Connect DVOM leads to Fuse No. 9 and GND circuits of BPP switch. See Fig 1 . While observing DVOM, apply brake pedal. If resistance is less than 5 ohms, repair open circuit between BPP switch and stoplight switch ground. Go to step  10 . If resistance is 5 ohms or more, replace faulty BPP switch. Go to step  10 .

  6. Verify BPP Switch Is Not Always Closed

    Turn ignition off. Disconnect BPP switch harness connector. Turn ignition on. Observe stoplights. If stoplights are still on, go to next step. If stoplights are now off, verify proper installation of BPP switch. If installation is okay, replace faulty BPP switch. Go to step  10 .

  7. Check For Short To Power In PCM

    Turn ignition off. Disconnect PCM connector. Turn ignition on. Observe stoplights. If stoplights are still on, go to next step. If stoplights are now off, replace faulty PCM. Go to step  10 .

  8. Check Stoplight Circuit For Short To Power In Harness

    Disconnect all modules (one at a time) that are associated with stoplight circuit (PCM, cruise control, GEM, 4WABS). After disconnecting each module, turn ignition on and observe stoplights. Turn ignition off. Repeat ignition cycling until each module has been disconnected or stoplights are off. If stoplights turn off when any of the modules are disconnected, go to appropriate MODULE COMMUNICATIONS NETWORK article in ACCESSORIES & EQUIPMENT. If stoplights do not turn off when modules are disconnected, repair short to power in stoplight circuit. See WIRING DIAGRAMS article. Go to step  10 .

  9. Check For BPP Circuit Cycling

    Turn ignition off. Disconnect PCM connector. Install breakout box, leaving PCM disconnected. Measure voltage between breakout box terminals No. 92 (BPP circuit) and No. 77 (PWR GND circuit) while applying and releasing brake pedal. If voltage cycles, replace faulty PCM. Go to next step. If voltage does not cycle, repair open BPP circuit to PCM. See WIRING DIAGRAMS article. Go to next step.

  10. Verify Trouble Shooting Of DTCs Completed

    Reconnect all electrical connectors. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no DTCs are set, trouble shooting is complete.
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