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HOMESERVICE MANUALSMAZDA2006B4000 BASE, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE SYMPTOM TROUBLESHOOTING - (3 OF 5)DTC APPLICATION CHART - POWERTRAIN CONTROL MODULE (PCM)BRAKE PEDAL POSITION (BPP) SWITCH MALFUNCTION

2006 Mazda B4000 Base, Automatic

Brake Pedal Position (BPP) Switch Malfunction

2006 Mazda B4000 Base, AutomaticSECTION Brake Pedal Position (BPP) Switch Malfunction

DTC P0703, P1703 DETECTION CONDITION & POSSIBLE CAUSES

DTC P0703, P1703	BRAKE PEDAL POSITION (BPP) SWITCH MALFUNCTION
DETECTION CONDITION	P0703 indicates that the powertrain control module (PCM) did not receive a BPP input. P1703 indicates the BPP signal was high (KOEO) or BPP signal did not cycle high and low (KOER).
POSSIBLE CAUSE	Open or short in BPP circuit Open or short in stoplamp circuits Damaged PCM Malfunction in module(s) connected to BPP circuit Damaged brake switch Misadjusted brake switch
HINT	BPP Switch Description Used by the PCM to disengage the transmission torque converter clutch and an input to the idle speed control for idle quality. Hard wired to the PCM and supplies battery positive voltage (B+) when the vehicle brake pedal is applied. The PCM receives BPP information through the SCP link. This pinpoint test will only verify Self-Test was performed correctly. For detail wiring information, refer to the appropriate SYSTEM WIRING DIAGRAM article.
Courtesy of MAZDA MOTORS CORP.

DTC P0703, P1703 DIAGNOSTIC PROCEDURE

DTC P0703, P1703		BRAKE PEDAL POSITION (BPP) SWITCH MALFUNCTION
STEP	INSPECTION		ACTION
1	Was the PCM quick test performed?	Yes	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 next step. For KOER DTC P0703 or P1703: Go to step 3.
1	Was the PCM quick test performed?	No	Perform PCM quick test. See PCM QUICK TEST .
2	DTCS P0703 AND P1703: CHECK OPERATION OF STOPLAMPS Apply and release the brake pedal several times and observe stoplamp operation. Do brake lamps operate normally?	Yes	Go to next step.
2		No	For stoplamps never on: Go to step 4. For stoplamps always on: Go to step 6.
3	CHECK FOR PCM BPP/BOO PID CYCLING Key on, engine off (KOEO). Access BPP/BOO PID with WDS or equivalent tester. Apply and release brake pedal several times while viewing BPP/BOO PID. Does the BPP/BOO PID cycle ON/OFF?	Yes	See GENERAL PINPOINT TEST 4: INTERMITTENT .
3		No	Go to step 9.
4	CHECK FOR POWER TO BPP SWITCH NOTE: Check the condition of the stoplamp bulbs before starting this test. Disconnect BPP switch. Measure B+ input voltage circuit BR, between the BPP switch and chassis ground. Is voltage greater than 10 V?	Yes	Go to next step.
4		No	Verify integrity of smart junction box fuse 32 for B+ to brake pedal position switch. If OK, repair open in B+ circuit. If fuse is damaged, check B+ circuit, BPP circuit, stop lamp PWR circuit and any other associated circuits for short to ground. See appropriate SYSTEM WIRING DIAGRAMS article. Repair as necessary. Go to step 10.
5	VERIFY INTEGRITY OF BPP SWITCH Connect multimeter test probes to pin 2 and pin 3 at the BPP switch. Apply brake pedal while monitoring reading. Is the resistance less than 5.0 ohms?	Yes	Repair open circuit between BPP switch and stoplamp ground. Go to step 10.
5		No	Replace BPP switch. See STOPLAMP SWITCH . Go to step 10.
6	VERIFY BPP SWITCH IS NOT ALWAYS CLOSED Key OFF. Disconnect BPP switch harness connector. Key on, engine off (KOEO). Are stoplamps still on?	Yes	Go to next step.
6		No	Verify proper installation of BPP switch. If OK, replace switch. See STOPLAMP SWITCH . Go to step 10.
7	CHECK FOR SHORT TO POWER IN PCM Key OFF. Disconnect PCM. Key on, engine off (KOEO). Are stoplamps still on?	Yes	Go to next step.
7		No	Replace PCM. See POWERTRAIN CONTROL MODULE (PCM) REMOVAL / INSTALLATION . Go to step 10.
8	CHECK STOPLAMP CIRCUIT FOR SHORT TO POWER IN HARNESS One at a time, disconnect all modules associated with the stoplamp circuit (PCM, cruise control, SJB, ABS). After disconnecting each module, turn key on and observe stoplamps. Turn key off. Repeat until each associated module has been disconnected or stoplamps turn off. Do stoplamps turn off when any of the modules are disconnected?	Yes	Go to the appropriate article for further diagnosis of appropriate module.
8		No	Repair short to power in stoplamp circuit. Go to step 10.
9	CHECK FOR BPP CIRCUIT CYCLING Key OFF. Disconnect PCM. Install breakout box, leave PCM disconnected. Measure voltage between PCM test pin 92 (BPP) and PCM test pin 77 (PWR GND) while applying and releasing the brake. Does the voltage cycle?	Yes	Replace PCM. See POWERTRAIN CONTROL MODULE (PCM) REMOVAL / INSTALLATION . Go to next step.
9		No	Repair open in BPP circuit to PCM. Go to next step.
10	VERIFY TROUBLESHOOTING OF DTCs COMPLETED Connect all disconnected connectors. Clear DTCs from PCM memory using WDS or equivalent tester. Perform PCM Quick Test. Is same DTC present?	Yes	Replace PCM. See POWERTRAIN CONTROL MODULE (PCM) REMOVAL / INSTALLATION . Repeat PCM Quick Test.
10		No	If any other DTC is present, go to applicable DTC inspection. See DIAGNOSTIC TROUBLE CODE (DTC) INDEX - POWERTRAIN CONTROL MODULE (PCM) . If no DTC is present, troubleshooting is complete.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.