Ecm / pcm internal engine off timer performance

To ensure the accuracy of the evap (evaporative emission) monitor values, the soak timer, which is built into the ecm, measures 5 hours (+-15 minutes) from when the ignition switch is turned off, before the monitor is run. This allows the fuel to cool down, which stabilizes the evap pressure. When 5 hours have elapsed, the ecm turns on.

5 Hours after the ignition switch is turned off, the soak timer activates the ecm to begin the evap system monitor. While the engine is running, the ecm monitors the synchronization of the soak timer and the cpu clock. If these two are not synchronized, the ecm interprets this as a malfunction, illuminates the mil and sets the dtc (2 trip detection logic).

• Dtc p2610 is set if an internal ecm problem is detected. Diagnostic procedures are not required.

1. 1
   Replace ecm
2. 2
   Replace the ecm (see page es-429).

   

1. 1
   Check whether dtc output recurs
2. 2
   Connect the intelligent tester to the dlc3.
3. 3
   Turn the ignition switch on.
4. 4
   Turn the tester on.
5. 5
   Clear dtcs (see page es-35).
6. 6
   Start the engine and wait for 10 minutes or more.
7. 7
   On the tester, select the following menu items: diagnosis / enhanced obd ii / dtc info / pending codes.
8. 8
   If no pending dtc is displayed, the repair has been successfully completed.