Toyota 2GR-FE Manual page 541

DTC P2610
DTC SUMMARY
DTC No. Monitoring Item
Soak timer (built
P2610
into ECM)
DESCRIPTION
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 Fuel Tank Pressure (FTP). When 5
hours have elapsed, the ECM turns on.
Soak Timer Circuit (fig. 3):
IG2
Ignition Switch
ST/AM2
FL MAIN
Battery
MONITOR DESCRIPTION
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).
MONITOR STRATEGY
Required Sensors/Components
Frequency of Operation
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ECM / PCM Internal Engine Off Timer Perfor-
mance
DTC Detection Condition
ECM internal malfunction
IG2
Main Body
ECU
IG2D
EFI
EFI MAIN
Trouble Area
ECM
IGN
IGSW
Soak Timer
IC
Power
+B
Source IC
EFI No. 2
Main Relay
MREL
Control IC
ECM
Once per driving cycle
ES–385
Detection
Detection Timing
Logic
Engine running 2 trip
ECM
A136968E01
ES