Last Modified: 11-29-2007 1.6 C
Service Category: Engine/Hybrid System Section: Engine Control
Model Year: 2008 Model: Sequoia Doc ID: RM000000T6X03LX
Title: 2UZ-FE ENGINE CONTROL: SFI SYSTEM: DTC SUMMARY (2008 Sequoia)

DTC

P2610

ECM / PCM Internal Engine Off Timer Performance

DTC SUMMARY

DTC No.

Monitoring Item

DTC Detection Condition

Trouble Area

Detection Timing

Detection Logic

P2610

Soak timer (built into ECM)

ECM internal malfunction

ECM

Engine running

2 trip

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 EVAP pressure. When 5 hours have elapsed, the ECM turns on.

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 stores the DTC (2 trip detection logic).

MONITOR STRATEGY

Required Sensors/Components

ECM

Frequency of Operation

Once per driving cycle

Duration

10 minutes

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTC not present

None

Ignition switch

ON

Engine

Running

Battery voltage

8 V or more

Starter

OFF

TYPICAL MALFUNCTION THRESHOLDS

Soak timer measurement when ECM CPU clock counts 10 minutes

Less than 7 minutes, or more than 13 minutes

INSPECTION PROCEDURE

HINT:

  • DTC P2610 is set if an internal ECM problem is detected. Diagnostic procedures are not required. ECM replacement is necessary.
  • Read freeze frame data using the Techstream. Freeze frame data records 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.

PROCEDURE

1.

REPLACE ECM

(a) Replace the ECM 2UZ-FE ENGINE CONTROL: ECM: REMOVAL (2008 Sequoia) .

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2.

CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream ON.

(d) Clear DTCs 2UZ-FE ENGINE CONTROL: SFI SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

(e) Start the engine and wait for 10 minutes or more.

(f) On the Techstream, enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

(g) If no pending DTC is displayed, the repair has been successfully completed.

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