Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001GHAM
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 03/2019]
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P1049; VALVEMATIC Circuit B1; 2020 MY Corolla [01/2019 - 03/2019]

DTC

P1049

VALVEMATIC Circuit B1

DESCRIPTION

The EDU in the continuously variable valve lift controller assembly monitors the driver circuit in the continuously variable valve lift controller assembly and detects malfunctions.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P1049

VALVEMATIC Circuit B1

EDU internal error (1 trip detection logic).

Continuously variable valve lift controller assembly

Comes on

DTC stored

MONITOR DESCRIPTION

When the ECM determines that there is a malfunction in the continuously variable valve lift controller assembly control circuit, it illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P1049: Rocker arm control module performance

Required Sensors/Components (Main)

Continuously variable valve lift controller assembly

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

3 times: Case 1

0.1 seconds: Case 2

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

All of the following conditions are met

-

Battery voltage

8 V or higher

Starter

Off

Time after starter on to off

0.5 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

Case 1

One of the following conditions is met

-

CPU I/O error

Judged

Specific random access memory error

Judged

Read only memory error

Judged

Case 2

One of the following conditions is met

-

ASIC: Position comparison error

Judged

ASIC: Communication error

Judged

ASIC: Position comparison cancel error

Judged

ASIC: Clock frequency error

Judged

EEPROM error

Judged

ASIC: Current flow pattern signal error

Judged

Battery voltage monitor error

Judged

Shutdown-control error

Judged

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Start the engine and warm it up.
  3. Turn the Techstream on.
  4. Clear the DTCs.
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Start the engine and idle it for 20 seconds.
  7. Turn the Techstream on.
  8. Clear the DTCs.
  9. Turn the ignition switch off and wait for at least 30 seconds.
  10. Start the engine and idle it for 20 seconds.
  11. Turn the ignition switch off and wait for at least 30 seconds.
  12. Turn the ignition switch to ON.
  13. Turn the Techstream on.
  14. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
  15. 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.
  16. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  17. Input the DTC: P1049.
  18. 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

    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 NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
  19. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs.

    Click here 2020 MY Corolla [01/2019 - 03/2019]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

    HINT:

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

CAUTION / NOTICE / HINT

NOTICE:

When one of the following DTCs is output and the MIL is illuminated, actuator position learning is performed during the next trip. After the system returns to normal, actuator position learning is performed during the next trip and the MIL remains illuminated until learning is complete.

Actuator position learning is performed when these DTCs are output.

P1049, P104A, P1055, P2646, P2647, P2648, P2649, P264A, U011B

HINT:

  • If DTC P104A is output at the same time as DTC P1049, disregard DTC P104A and proceed with the inspection.
  • After performing repairs, perform the following procedures and check that DTCs are not output again.
  • After using the Techstream to perform minimum valve lift learning, keep the engine idling for 30 seconds to complete learning. Otherwise, the VALVEMATIC system may not operate normally, causing poor acceleration, etc.
  • 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

1.

REPLACE CONTINUOUSLY VARIABLE VALVE LIFT CONTROLLER ASSEMBLY

(a) Replace the continuously variable valve lift controller assembly.

Click here 2020 MY Corolla [01/2019 - 03/2019]; 2ZR-FAE (ENGINE CONTROL): CONTINUOUSLY VARIABLE VALVE LIFT CONTROLLER: REMOVAL

HINT:

Perform "Inspection After Repair" after replacing the continuously variable valve lift controller assembly.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

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