Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA2009B2300 L4-2.3LREPAIR AND DIAGNOSISSTEERING AND SUSPENSIONWHEELS AND TIRESTIRE MONITORING SYSTEMTESTING AND INSPECTIONPINPOINT TESTSPINPOINT TEST 3: TPMS INDICATOR FLASHES WHEN THE IGNITION KEY IS TURNED TO THE ON POSITION AND DTC B2872 IS PRESENT
2009 Mazda B2300 L4-2.3L
Pinpoint Test 3: TPMS Indicator Flashes When The Ignition Key Is Turned To The On Position And DTC B2872 Is Present
2009 Mazda B2300 L4-2.3LSECTION Pinpoint Test 3: TPMS Indicator Flashes When The Ignition Key Is Turned To The On Position And DTC B2872 Is Present
PINPOINT TEST 3: TPMS INDICATOR FLASHES WHEN THE IGNITION KEY IS TURNED TO THE ON POSITION AND DTC B2872 IS PRESENT
Normal OperationIf there is a fault in the tire pressure monitoring system (TPMS), such as a damaged or missing sensor(s), damaged module or a communication issue within the vehicle, DTCs are set in the smart junction box (SJB), the TPMS warning indicator will flash for 70 seconds and then remain ON solid when the ignition switch is turned to the ON position and the message center (if equipped) will display TIRE PRESSURE SENSOR FAULT. If the SJB does not get a response from all 4 TPMS sensors, DTC B287A may be set and the message center (if equipped) will display TIRE PRESSURE MONITOR FAULT.
This pinpoint test is intended to diagnose the following:
- TPMS sensor(s) missing
- TPMS sensor(s) not trained to the vehicle
- TPMS sensor(s) swapped due to wheel swap
- TPMS sensor(s) damaged
- Vehicle communication issue
- SJB
NOTE:If a warranty case is opened for an actual TPMS fault, document and include the actual tire pressure data in all warranty communications.
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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.