Evaporative Emissions System: Service Precautions
Fuel Cap Warning MessageThe ECM/PCM detects whether the fuel fill cap is loose or missing under certain conditions and alerts the driver by showing the information in the odometer/trip meter display. If the ECM/PCM detects a small volume leak, the MIL may come on during the second drive cycle and store a DTC.
First drive cycle
During the first drive cycle after a cold start, the ECM/PCM alerts the driver to check the fuel fill cap by showing a "CHECK FUEL CAP" message in the odometer/trip meter display (A), and it stores Temporary DTC P0457 "Evaporative Emission (EVAP) System Leak Detected/Fuel Cap Loose or Missing".
Tightening the fuel cap does not make the message go off immediately.
To make the message go off
Tighten the fuel fill cap three clicks, and do this procedure several times.
1. Turn the ignition switch OFF.
2. Start the engine, and drive at a steady speed over 28 mph (45 km/h), without moving the accelerator pedal, for about 1 minute.
Second drive cycle
During the second drive cycle after a cold start, if the fuel fill cap is still loose or missing, the ECM/PCM alerts the driver to check the fuel fill cap by showing a "CHECK FUEL CAP" message in the odometer/trip meter 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/PCM stores DTCP0457 "Evaporative Emission (EVAP) System Leak Detected/Fuel Cap Loose or Missing". The malfunction indicator lamp (MIL) (A) comes on, and the "CHECK FUEL CAP" message goes off.