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DI-866
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDSA-01
DTC P2610 ECM/PCM Internal Engine OFF Timer Perfor-
mance
DTC SUMMARY
Detection Detection
DTC Monitoring Items Malfunction Detection Conditions Trouble Areas
Timings Logic
Engine
P2610 Soak timer (built into ECM) ECM internal malfunction ECM 2 trip
running
CIRCUIT 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 moni-
tor 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
Ignition Switch ECM
IGSW
+B Power
EFI MAIN Source IC
15 A
MREL Main Relay
Control IC
Battery
Soak Timer IC
A23667
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
Related DTCs P2610 Soak timer (built into ECM)
Required sensors/components ECM
Frequency of operation Once per driving cycle
Duration 10 min.
MIL operation 2 driving cycles
Sequence of operation None
DI-867
DIAGNOSTICS - ENGINE (2UZ-FE)
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-437
DTCs are not present
Battery voltage 8V -
Ignition switch ON
Starter OFF
Engine Running
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
Soak time measurement when ECM CPU clock counts 10
Less than 7 min., or more than 13 min.
min.
INSPECTION PROCEDURE
HINT:
S DTC P2610 is set if an internal ECM problem is detected. Diagnostic procedures are not required. ECM
replacement is required.
S Read freeze frame data using a hand-held tester. Freeze frame data record the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle
was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and
other data, from the time the malfunction occurred.
1 Replace ECM (See page SF-82).
NEXT
Check whether DTC output recurs.
(a) Connect a hand-held tester to the DLC3.
(b) Turn the ignition switch to ON.
(c) Clear DTCs (see page DI-462).
(d) Start the engine and wait for 10 minutes or more.
(e) On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PEND-
ING CODES.
(f) If no pending DTC is displayed, the repair has been successfully completed.
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