DTC P2610 ECM / PCM Internal Engine Off Timer Performance: Description

To ensure the accuracy of the EVAP (Evaporative Emission) monitor values, the soak timer, which is built into the ECM (included in the HV control ECU), measures 5 hours (+/-15 minutes) from the time the ignition switch is turned off, before the monitor begins to run. This allows the fuel to cool down, which stabilizes the Fuel Tank Pressure (FTP). When 5 hours have elapsed, the ECM turns on.