Intention of troubleshooting procedure

WARNING: This page is about a different variant/trim than selected.

Step 1
- Visually verify that there are no traces of freezing on the fuel tank pressure sensor.
Step 2-3
- Inspect the charcoal canister for clogging.
Step 4
- Perform a unit inspection of the CV solenoid valve.
Step 5
- Verify that there is no breakage or clogging in the evaporative hose.
Step 6
- Perform a unit inspection of the fuel tank pressure sensor.
Repair completion verification
- Verify that the primary malfunction is resolved and there are no other malfunctions.

P0451-00: (PCM - VIN Y) TROUBLESHOOTING DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	PURPOSE: VISUALLY VERIFY THAT THERE ARE NO TRACES OF FREEZING ON FUEL TANK PRESSURE SENSOR Visually inspect for fuel tank pressure sensor. Can traces of freezing be verified on the fuel tank pressure sensor?	Yes	Evaporative gas freezes when the ambient temperature is low, and it is highly possible that the fuel tank pressure sensor measurement is affected because the vehicle was not refueled appropriately. Replace the fuel and perform the repair completion verification 1.
1		No	Go to Step 5.
2	PURPOSE: INSPECTION OF CHARCOAL CANISTER MAIN FOR CLOGGING Inspect for clogging in the charcoal canister main. (Refer to CHARCOAL CANISTER INSPECTION (VIN Y) in the service information.) Is there any malfunction?	Yes	Replace the charcoal canister and perform the repair completion verification 1. (Refer to CHARCOAL CANISTER REMOVAL/INSTALLATION (VIN Y) in the service information.)
2		No	Go to the next step.
3	PURPOSE: INSPECTION OF CHARCOAL CANISTER SUB FOR CLOGGING Inspect for clogging in the charcoal canister sub. (Refer to CHARCOAL CANISTER INSPECTION (VIN Y) in the service information.) Is there any malfunction?	Yes	Replace the charcoal canister and perform the repair completion verification 1. (Refer to CHARCOAL CANISTER REMOVAL/INSTALLATION (VIN Y) in the service information.)
3		No	Go to the next step.
4	PURPOSE: INSPECT CV SOLENOID VALVE FOR MALFUNCTION Inspect the applicable part. (Refer to CANISTER VENT (CV) SOLENOID VALVE INSPECTION (VIN Y) in the service information.) Is the part normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to CANISTER VENT (CV) SOLENOID VALVE REMOVAL/INSTALLATION (VIN Y) in the service information.)
5	PURPOSE: INSPECTION OF EVAPORATIVE HOSE FOR BREAKAGE OR CLOGGING Inspect for breakage or clogging in the evaporative hose (hose between CV solenoid valve and atmosphere). Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
5		No	Go to the next step.
6	PURPOSE: INSPECT FUEL TANK PRESSURE SENSOR FOR MALFUNCTION Inspect the applicable part. (Refer to FUEL TANK PRESSURE SENSOR INSPECTION (VIN Y) in the service information.) Is the part normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to FUEL TANK PRESSURE SENSOR REMOVAL/INSTALLATION (VIN Y) in the service information.)
Repair completion verification 1	PURPOSE: VERIFY THAT VEHICLE IS REPAIRED Install/connect the part removed/disconnected during the troubleshooting procedure. Clear the DTC recorded in the memory. (see CLEARING DTC .) Replicate the vehicle conditions at the time the DTC was detected using the following procedure. Implement the repeatability verification procedure. (See REPEATABILITY VERIFICATION PROCEDURE .) Perform the DTC inspection for the PCM. (See DTC INSPECTION .) Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] .) If the CAN communication is normal, perform the diagnosis from Step 1. If the malfunction recurs, replace the PCM, then go to the next step. (Refer to PCM REMOVAL/INSTALLATION (VIN Y) in the service information.)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	PURPOSE: VERIFY IF OTHER DTCs DISPLAYED Perform the DTC inspection. (See DTC INSPECTION .) Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.