Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001HT57 |
Model Year Start: 2020 |
Model: Corolla |
Prod Date Range: [03/2019 - 11/2022] |
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P1049; VALVEMATIC Circuit B1; 2020 - 2023 MY Corolla [03/2019 - 11/2022] |
DTC
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P1049
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VALVEMATIC Circuit B1
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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.
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Detection Item
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DTC Detection Condition
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Trouble Area
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MIL
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Memory
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Note
|
P1049
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VALVEMATIC Circuit B1
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EDU internal error (1 trip detection logic).
|
Continuously variable valve lift controller assembly
|
Comes on
|
DTC stored
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DTC for Mexico Models
- Applies
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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
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P1049: Rocker arm control module performance
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Required Sensors/Components (Main)
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Continuously variable valve lift controller assembly
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Required Sensors/Components (Related)
|
-
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Frequency of Operation
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Continuous
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Duration
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3 times: Case 1
0.1 seconds: Case 2
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MIL Operation
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Immediate
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Sequence of Operation
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None
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TYPICAL ENABLING CONDITIONS
Monitor runs whenever the following DTCs are not stored
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None
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All of the following conditions are met
|
-
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Battery voltage
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8 V or higher
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Starter
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Off
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Time after starter on to off
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0.5 seconds or more
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TYPICAL MALFUNCTION THRESHOLDS
Case 1
One of the following conditions is met
|
-
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CPU I/O error
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Judged
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Specific random access memory error
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Judged
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Read only memory error
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Judged
|
Case 2
One of the following conditions is met
|
-
|
ASIC: Position comparison error
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Judged
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ASIC: Communication error
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Judged
|
ASIC: Position comparison cancel error
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Judged
|
ASIC: Clock frequency error
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Judged
|
EEPROM error
|
Judged
|
ASIC: Current flow pattern signal error
|
Judged
|
Battery voltage monitor error
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Judged
|
Shutdown-control error
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Judged
|
CONFIRMATION DRIVING PATTERN
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Connect the Techstream to the DLC3.
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Start the engine and warm it up.
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Turn the Techstream on.
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Clear the DTCs.
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Turn the ignition switch off and wait for at least 30 seconds.
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Start the engine and idle it for 20 seconds.
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Turn the Techstream on.
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Clear the DTCs.
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Turn the ignition switch off and wait for at least 30 seconds.
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Start the engine and idle it for 20 seconds.
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Turn the ignition switch off and wait for at least 30 seconds.
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Turn the ignition switch to ON.
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Turn the Techstream on.
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Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
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Read the pending DTCs.
HINT:
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If a pending DTC is output, the system is malfunctioning.
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If a pending DTC is not output, perform the following procedure.
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Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
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Input the DTC: P1049.
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Check the DTC judgment result.
Techstream Display
|
Description
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NORMAL
|
-
DTC judgment completed
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System normal
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ABNORMAL
|
-
DTC judgment completed
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System abnormal
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INCOMPLETE
|
-
DTC judgment not completed
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Perform driving pattern after confirming DTC enabling conditions
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N/A
|
-
Unable to perform DTC judgment
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Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
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HINT:
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If the judgment result shows NORMAL, the system is normal.
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If the judgment result shows ABNORMAL, the system has a malfunction.
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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
HINT:
-
If a permanent DTC is output, the system is malfunctioning.
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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
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HINT:
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If DTC P104A is output at the same time as DTC P1049, disregard DTC P104A and proceed with the inspection.
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After performing repairs, perform the following procedures and check that DTCs are not output again.
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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.
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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.
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REPLACE CONTINUOUSLY VARIABLE VALVE LIFT CONTROLLER ASSEMBLY
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(a) Replace the continuously variable valve lift controller assembly.
Click here
HINT:
Perform "Inspection After Repair" after replacing the continuously variable valve lift controller assembly.
Click here
NEXT |
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END
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