Monday, June 18, 2012

Hyundai, check engine light is on, P0452

VEHICLE: 2007 Hyundai Veracruz SE 3.8L, V6, MFI, DOHC, VIN C

MILEAGE: 64,793

Customer Concern: The check engine light is on with an Evaporative Emissions (EVAP) pressure sensor low input automotive diagnostic code of P0452.

Tests: 1. Check the Fuel Tank Pressure Sensor (FTPS) for a 5 volt reference at the Brown wire, ground of less than 0.05 volts at the Gray/Black wire, and check the Green signal wire for about 2.5 volts with no pressure of vacuum in the fuel tank or EVAP system. Remove the fuel cap and see if the voltage changes.

2. If the voltage was low and came up with the cap off, check for a restriction in the charcoal canister or EVAP filter. Test the canister closed valve to be open at rest and closed when energized, test it several times to see if it sticks.

Potential Causes: Fuel Tank Pressure Sensor (FTPS)

Canister Closed Valve (CCV)

Charcoal Canister

EVAP Canister Vent Filter

Confirmed Fix: Replaced Fuel Tank Pressure Sensor (FTPS)

Tech Tips: This vehicle has a 5 year/60,000 mile bumper to bumper warranty and a 10 year/100,000 mile power train warranty

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