Toyota Avalon (XX50): ECM/PCM Engine Off Timer Performance Signal Invalid (P261029,P261093). Parts Location. Precaution

ECM/PCM Engine Off Timer Performance Signal Invalid (P261029,P261093)

DTC SUMMARY

DESCRIPTION

The soak timer operates after the engine switch is turned off. When a certain amount of time has elapsed after turning the engine 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

If the soak timer activates the ECM even though only a short amount of time has elapsed since the engine 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 engine switch was turned off, the ECM determines that the soak timer is malfunctioning, illuminates the MIL and stores a DTC the next time the engine switch is turned on (IG).

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

HINT:

• After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

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• When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

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1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
5. Turn the engine switch off and wait for at least 30 seconds.
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].
7. Turn the engine switch off and wait for at least 15 seconds [B].
8. Start the engine [C].
9. Stop the engine and leave the vehicle for 60 minutes or more [D].
10. Turn the engine switch on (IG).
11. Turn the Techstream on.
12. Enter the following menus: Powertrain / Engine / Trouble Codes [E].
13. 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.
14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
15. Input the DTC: P261029 or P261093.
16. Check the DTC judgment result.

    Techstream 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

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
    • [A] to [E]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CAUTION / NOTICE / HINT

HINT:

• DTC P261029 or P261093 is set if an internal ECM problem is detected. Diagnostic procedures are not required. ECM replacement is required.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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

(a) Replace the ECM.

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NEXT

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTC.

(e) Turn the engine switch off and wait for at least 30 seconds.

NEXT

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

(c) If no pending DTC is output, the repair has been successfully completed.

NEXT

END

Parts Location

PARTS LOCATION

ILLUSTRATION

ILLUSTRATION

ILLUSTRATION

ILLUSTRATION

ILLUSTRATION

Precaution

PRECAUTION

INITIALIZATION

NOTICE:

• Before replacing the ECM, refer to Registration.

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• Perform Registration (VIN registration) after replacing the ECM.

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• Perform Learning Value Reset and Idle Learning after replacing or servicing parts related to engine operation.

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• Make sure to perform Reset Memory (A/T initialization), when replacing the automatic transaxle assembly, ECM or engine assembly.

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• When the cable is disconnected from the negative (-) battery terminal, initialize the following system(s) after the cable is reconnected.

  System Name	See Procedure
  Lane Departure Alert System (w/ Steering Control)
  Intelligent Clearance Sonar System
  Parking Assist Monitor System
  Panoramic View Monitor System
  Pre-collision System
  Lighting System (for Gasoline Model with Cornering Light)

WHEN USING TECHSTREAM

CAUTION:

Observe the following items for safety reasons:

• Before using the Techstream, read the instruction manual.
• Prevent the Techstream cable from being caught on the pedals, shift lever or steering wheel when driving with the Techstream connected to the vehicle.
• When driving the vehicle for testing purposes using the Techstream, 2 persons are required. One drives the vehicle, and the other operates the Techstream.