Evaporative Emissions System: Service Precautions
Fuel Cap Warning MessageThe ECM detects whether the fuel fill cap is loose or missing under certain conditions and alerts the driver by showing the information in the odometer/outside temperature display. If the ECM detects a small volume leak, the MIL may come on during the third drive cycle and store a DTC.
First drive cycle
During the first drive cycle after a cold start, the ECM alerts the driver to check the fuel fill cap by showing a "CHECK FUEL CAP" message in the odometer/outside temperature display (A), and it stores Temporary DTC P0457 "Evaporative Emission (EVAP) System Leak Detected/Fuel Fill Cap Loose or Missing". Tightening the fuel cap does not make the message go off immediately.
To make the message go off (With the HDS)
Procedure
1. Tighten the fuel fill cap until it clicks.
2. Clear the Temporary DTC with the HDS.
3. Verify there is no leak by doing the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS.
To make the message go off (Without the HDS)
Procedure
1. Tighten the fuel fill cap until it clicks.
2. Turn the ignition switch OFF.
3. Start the engine, and drive at a steady speed over 28 mph (45 km/h), without moving the accelerator pedal, for about 1 minute. Do step 2 and 3 several times.
Second drive cycle
During the second drive cycle after a cold start, if the fuel fill cap is still loose or missing, the ECM alerts the driver to check the fuel fill cap by showing a "CHECK FUEL CAP" message in the odometer/outside temperature display as same as the first drive cycle. Tightening the fuel cap does not make the message go off immediately.
Third drive cycle
During the third drive cycle after a cold start, if the fuel fill cap is still loose or missing, the ECM stores DTC P0457 "Evaporative Emission (EVAP) System Leak Detected/Fuel Fill Cap Loose or Missing". The malfunction indicator lamp (MIL) (A) comes on, and the "CHECK FUEL CAP" message goes off.