P0442 - Evaporative Emission System Leak Detected (Small Leak)

4-68 Powertrain DTC Charts and Descriptions

Diagnostic Trouble Code (DTC) Charts and Descriptions

P0442 - Evaporative Emission System Leak Detected (Small Leak) (Continued)

All GO to Pinpoint Test HX.

P0443 - Evaporative Emission System Purge Control Valve Circuit

Description: This DTC sets when the signal moves outside the minimum or maximum limit for the commanded state.

Possible Causes: • VPWR circuit open

• EVAPCP circuit open

• EVAPCP circuit short to ground

• EVAPCP circuit short to voltage

• Damaged EVAP purge valve

• Damaged PCM

Diagnostic Aids: To verify normal function, monitor the EVMV PID or EVAPCP PID and the signal voltage (PCM control side).

With the valve closed, the EVMV indicates 0 mA (0% duty cycle for EVAPCP) and voltage approximately equal to battery voltage. When the valve is commanded fully open, EVMV indicates 1,000 mA (100% duty cycle for EVAPCP) and a voltage drop of 3 volts minimum is normal.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test HX.

P0446 - Evaporative Emission System Vent Control Circuit

Description: This DTC sets when the signal moves outside the minimum or maximum allowable calibrated parameters for a

specified EVAP canister vent valve duty cycle by PCM command.

Possible Causes: • VPWR circuit open

• KAPWR circuit open

• CANV circuit open

• CANV circuit short to ground

• CANV circuit short to voltage

• CANV circuit short to KAPWR

• Damaged EVAP canister vent valve

• Damaged PCM

Diagnostic Aids: To verify normal function, monitor the EVAP canister vent valve signal PID EVAPCV and the signal voltage

(PCM control side). With the valve open, EVAPCV indicates 0% duty cycle and a voltage approximately equal to battery voltage. When the valve is commanded fully closed, EVAPCV indicates 100% duty cycle, and a minimum voltage drop of 4 volts is normal.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test HX.

P0451 - Evaporative Emission System Pressure Sensor/Switch Range/Performance

Description: This DTC sets when a fuel tank pressure (FTP) sensor range (offset) concern is detected. The FTP sensor

output is offset by greater than 1.7 inches of water or less than -1.7 inches of water.

Possible Causes: • FTP circuit intermittent open

• FTP circuit intermittent short

• FTP sensor intermittent open

• FTP sensor intermittent short

• Contaminated FTP sensor

• Damaged FTP sensor

• Damaged PCM

Diagnostic Aids: With the FTP sensor at atmospheric pressure, the FTP PID normally indicates 0 inches of water. Remove the

fuel filler cap or, for vehicles with a capless fuel filler pipe, install the supplemental refueling adaptor provided with the vehicle to open the capless fuel tank filler pipe. After installing the supplemental refueling adaptor or removing the fuel filler cap, wait one minute to allow the pressure in the fuel tank to equalize with the ambient air pressure before accessing the PID.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test HX.

2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015