Toyota Tundra Service Manual: ECM / PCM Internal Engine Off Timer Performance (P2610)

Toyota Tundra Service Manual / Engine, Hybrid System / 1ur-fe Engine Control / Sfi System / ECM / PCM Internal Engine Off Timer Performance (P2610)

DTC SUMMARY

DTC No.

Monitoring Item

Malfunction Detection Condition

Trouble Area

Detection Timing

Detection Logic

P2610

Soak timer (built into ECM)

ECM internal malfunction

(2 trip detection logic)

ECM

Engine running

2 trip

DESCRIPTION

The soak timer operates after the ignition switch is turned off. When a certain amount of time has elapsed after turning the ignition switch off the soak timer activates the ECM to perform malfunction checks which can only be performed after the engine is stopped. The soak timer is built into the ECM.

MONITOR DESCRIPTION

  1. 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. If the soak timer activates the ECM even though only a short amount of time has elapsed since the ignition switch was turned off, or if the soak timer does not activate the ECM even though a considerable amount of time has elapsed since the ignition switch was turned off, the ECM determines that the soak timer is malfunctioning, illuminates the MIL and stores a DTC the next time the ignition switch is turned ON.

MONITOR STRATEGY

Required Sensors/Components

ECM

Frequency of Operation

Once per driving cycle

Duration

2 times: Case 1

-: Case 2 and 3

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever following DTCs are not stored

None

Case 1

All of the following conditions are met

-

Battery voltage

8 V or higher

Ignition switch

OFF

CPU clock elapsed time

1.96608 seconds or more

Case 2

All of the following conditions are met

-

Internal engine off timer (elapsed time from engine stop)

10 minutes or more, and less than 30 minutes

Battery voltage

8 V or higher

Ignition switch

ON

Starter

OFF

Case 3

All of the following conditions are met

-

Internal engine off timer (elapsed time from engine stop)

40 minutes or more

Battery voltage

8 V or higher

Ignition switch

ON

Starter

OFF

TYPICAL MALFUNCTION THRESHOLDS

Case 1

One of the following conditions is met

Condition A, B or C

A. Both of the following conditions are met

Condition (a) and (b)

(a) CPU clock elapsed time

1.96608 seconds or more, and less than 8.323072 seconds

(b) Internal Engine off timer

9.375 seconds or more

B. Both of the following conditions are met

Condition (c) and (d)

(c) CPU clock elapsed time

8.323072 to 10.420224 seconds

(d) Internal Engine off timer

18.75 seconds or more

C. Both of the following conditions are met

Condition (e) and (f)

(e) CPU clock elapsed time

More than 10.420224 seconds

(f) Internal Engine off timer

Less than 9.375 seconds

Case 2

ECM started by internal engine off timer last trip

Yes

Case 3

ECM started by internal engine off timer last trip

No

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on.
  6. Start the engine.
  7. Idle the engine for 10 minutes or more.
  8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
  9. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  11. Input the DTC: P2610.
  12. Check the DTC judgment result.

    Tester Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    If the judgment result shows ABNORMAL, the system has a malfunction.

  13. If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

CAUTION / NOTICE / HINT

HINT:

  • DTC P2610 is stored 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 (See page ).

NEXT

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 (See page ).

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

(f) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

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

NEXT

END

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