Safety Warning

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HOMESERVICE MANUALSMAZDA2023CX-5 SREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMON-BOARD DIAGNOSTIC - ENGINE CONTROL (VIN M) (5 OF 6)DTC P1450-00: EVAPORATOR SYSTEM - ABNORMAL NEGATIVE PRESSURE IN FUEL TANKDETAILS ON DTCS

2023 Mazda CX-5 S

Details On DTCs

2023 Mazda CX-5 SSECTION Details On DTCs

DTC P1450:00 [PCM - SKYACTIV-G 2.5, VIN M) DETECTION CONDITION AND POSSIBLE CAUSE

DESCRIPTION	Evaporator system: abnormal negative pressure in fuel tank
DETECTION CONDITION	Determination conditions	Target negative pressure exceeding the specified time or more is generated from negative pressure inducted to the fuel tank by the operation of the purge solenoid valve after the fuel tank is sealed (CV solenoid valve ON).
	Preconditions	Evaporative gas flow amount: Exceeds 10, 000 cm³ /min or fuel tank vacuum is high Fuel tank pressure: -4, 340.2-4, 030.1 Pa {-442.57-410.95 kgf/m² , -0.62949-0.58452 psi} ^1 IAT sensor No. 1: 4.44-43.33°C {40.0-109.9°F} ^1 Vehicle speed: 64-145 km/h {40.0-90.0 mph}* Barometric pressure: above 72.23 kPa {0.7365 kgf/cm² , 10.48 psi} ^1 Period ignition is switched off before engine starts: 210 min or more Fuel level in fuel tank: 15-85 % ^1 Minimum value of intake manifold vacuum: 4 kPa {0.04 kgf/cm² , 0.6 psi} or more Minimum value of intake air amount: above 2 g/sec Battery voltage: above 11 V ^1 The following DTCs are not detected: ECT sensor: P0117:00, P0118:00 TP sensor No. 1: P0122:00, P0123:00 TP sensor No. 2: P0222:00, P0223:00 Purge solenoid valve: P0443:00 CV solenoid valve: P0446:00 MAF sensor: P0100:00 Fuel tank pressure sensor: P0451:00, P0452:00, P0453:00 IAT sensor No. 1: P0110:00 MAP sensor: P0069:00, P0107:00, P0108:00 BARO sensor: P2226:00, P2228:00, P2229:00 VSS signal: P0500:00 Fuel gauge sender unit: P0460:00, P0461:00, P0462:00, P0463:00 1: Standard can be verified by displaying PIDs using M-MDS
	Malfunction determination period	75 s period
	Drive cycle	2
	Self test type	CMDTC self test
	Sensor used	Fuel tank pressure sensor
FAIL-SAFE FUNCTION	Not applicable
VEHICLE STATUS WHEN DTCs ARE OUTPUT	Illuminates check engine light.
POSSIBLE CAUSE	Fuel tank pressure sensor malfunction Restriction between charcoal canister and release-side passage CV solenoid valve malfunction Charcoal canister malfunction Clogging between fuel tank and fuel tank pressure sensor Purge solenoid valve malfunction PCM malfunction

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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.