Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001HT5D |
Model Year Start: 2020 |
Model: Corolla |
Prod Date Range: [03/2019 - 11/2022] |
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P10A0,P1055; VALVEMATIC Angle Difference(CSS); 2020 - 2023 MY Corolla [03/2019 - 11/2022] |
DTC
|
P10A0
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VALVEMATIC Angle Difference(CSS)
|
DTC
|
P1055
|
VALVEMATIC Angle Difference (ECU)
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DESCRIPTION
The VALVEMATIC system is able to continuously change the valve lift amount and valve timing. The VALVEMATIC system cooperates with the VVT-i to adjust the valve lift amount and valve timing optimally according to driving conditions. The ECM calculates the target intake air amount based on the amount the accelerator pedal is depressed and the engine speed to determine the valve lift amount (duration), valve timing and throttle valve opening angle. The continuously variable valve lift controller assembly operates the actuator to adjust the duration to the duration requested by the ECM via CAN communication. The actual operating conditions are monitored by the sensors in the continuously variable valve lift controller assembly, which sends the actual duration value to the ECM. The continuously variable valve lift controller assembly consists of the EDU, actuator, differential roller gear, angle sensor and position sensor.
*1
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ECM
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*2
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Continuously Variable Valve Lift Controller Assembly
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*3
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EDU
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*4
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Actuator
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*5
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Differential Roller Gear
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*6
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Position Sensor and Angle Sensor
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*7
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Engine
|
*8
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Continuously Variable Valve Train
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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
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P1055
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VALVEMATIC Angle Difference (ECU)
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The actual duration differs from the requested duration by 14.5°CA or higher for a certain period of time (1 trip detection logic).
|
-
Continuously variable valve lift controller assembly
-
Camshaft housing sub-assembly
|
Comes on
|
DTC stored
|
DTC for Mexico Models
- Applies
|
P10A0
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VALVEMATIC Angle Difference(CSS)
|
The actual duration differs from the requested duration by 14.5°CA or higher for a certain period of time (1 trip detection logic).
|
-
Continuously variable valve lift controller assembly
-
Camshaft housing sub-assembly
|
Comes on
|
DTC stored
|
DTC for Mexico Models
- Does not apply
|
Perform the following procedures to confirm that the VALVEMATIC system is operating normally.
-
Connect the Techstream to the DLC3.
-
Start the engine.
-
Turn the Techstream on.
-
Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VALVEMATIC(ENG ON) / Data List / VALVEMATIC Current Angle and VALVEMATIC Target Angle.
Click here
NOTICE:
Make sure the following conditions are met when performing the Active Test.
-
The engine is idling.
-
The engine coolant temperature is 40°C (104°F) or higher.
-
The vehicle is stationary.
-
The shift lever is in P or N (neutral).
The "VALVEMATIC Current Angle" follows the "VALVEMATIC Target Angle".
HINT:
Perform a simulation test by referring to the engine coolant temperature and intake air temperature recorded in the Freeze Frame Data.
When the Active Test results are abnormal, remove the continuously variable valve lift controller assembly from the camshaft housing sub-assembly and perform the "Activate the VALVEMATIC(ENG OFF)" Active Test with the continuously variable valve lift controller assembly removed to determine whether the problem is with the continuously variable valve lift controller assembly or camshaft housing sub-assembly.
MONITOR DESCRIPTION
The ECM monitors the continuously variable valve lift controller assembly and detects malfunctions. If the actual duration differs from the requested duration by 14.5°CA or higher, the ECM illuminates the MIL and stores a DTC. DTC P10A0 is usually only stored if a malfunction is detected during cold engine start. DTC P1055 is stored if a malfunction is detected in any other situation.
MONITOR STRATEGY
Related DTCs
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P10A0: VALVEMATIC system target error / slow response malfunction for VALVEMATIC cold start strategy
P1055: VALVEMATIC system target error / slow response malfunction
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Required Sensors/Components (Main)
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Continuously variable valve lift controller assembly
Camshaft housing sub-assembly
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Required Sensors/Components (Related)
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-
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Frequency of Operation
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Continuous
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Duration
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8 seconds or less
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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
P10A0
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
|
-
|
Engine coolant temperature
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-20°C (-4°F) or higher
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Motor activation
|
Active
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Engine speed
|
300 rpm or higher
|
Battery voltage
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8 V or higher
|
Cold start conditions* of secondary parameters in VALVEMATIC cold start strategy are met
|
-
|
P1055
Monitor runs whenever the following DTCs are not stored
|
None
|
All of the following conditions are met
|
-
|
Engine coolant temperature
|
-20°C (-4°F) or higher
|
Motor activation
|
Active
|
Engine speed
|
300 rpm or higher
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Battery voltage
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8 V or higher
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Cold start conditions* of secondary parameters in VALVEMATIC cold start strategy are not met
|
-
|
*: Cold start conditions is all of the following conditions are met
|
-
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Engine coolant temperature
|
-10°C (14°F) or higher, and less than 60°C (140°F)
|
Idle
|
On
|
Target valve event angle
|
150°CA
|
TYPICAL MALFUNCTION THRESHOLDS
Separation of valve event angle [target - actual angle]
|
14.5°CA or higher
|
CONFIRMATION DRIVING PATTERN
P10A0
-
Connect the Techstream to the DLC3.
-
Start the engine and warm it up (until the engine coolant temperature 75°C (167°F) or higher).
-
Turn the Techstream on.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Turn the ignition switch off and wait for at least 30 seconds.
-
Turn the ignition switch to ON.
-
Turn the Techstream on.
-
Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
-
Check that the "Coolant Temp" is between -10 to 60°C (14 to 140°F).
-
Start the engine.
-
Enter the following menus: Powertrain / Engine and ECT / Data List / Accelerator Idle Position and VALVEMATIC Current Angle.
-
Check that the "Accelerator Idle Position" is ON and "VALVEMATIC Current Angle" is 150 deg(CA).
-
Idle the engine for 20 seconds.
-
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
-
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.
-
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
-
Input the DTC: P10A0.
-
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
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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.
-
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.
-
If no permanent DTC is output, the system is normal.
P1055
-
Connect the Techstream to the DLC3.
-
Start the engine and warm it up (until the engine coolant temperature 75°C (167°F) or higher).
-
Turn the Techstream on.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Turn the ignition switch off and wait for at least 30 seconds.
-
Start the engine and idle it for 20 seconds.
-
Turn the Techstream on.
-
Clear the DTCs.
-
Turn the ignition switch off and wait for at least 30 seconds.
-
Start the engine and idle it for 20 seconds.
-
Turn the ignition switch off and wait for at least 30 seconds.
-
Turn the ignition switch to ON.
-
Turn the Techstream on.
-
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
-
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.
-
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
-
Input the DTC: P1055.
-
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.
-
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.
-
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
|
PROCEDURE
1.
|
CHECK ANY OTHER DTCS OUTPUT
|
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(e) Read the DTCs.
Powertrain > Engine and ECT > Trouble Codes
Result
|
Proceed to
|
DTC P10A0 and/or P1055 are output
|
A
|
DTC P0112, P0113, P0115, P0117 or P0118 is output at same time as DTC P10A0 and/or P1055
|
B
|
HINT:
-
If an engine coolant temperature sensor malfunction DTC or intake air temperature sensor malfunction DTC is output at the same time as DTC P1055 or P10A0, check the corresponding temperature sensor first.
-
After repairing the temperature sensor, clear the DTCs, perform a simulation test and check that the temperature sensor DTC is not output.
-
When the temperature sensor DTC does not recur but DTC P1055 or P10A0 is output again, perform troubleshooting from the next step. If a DTC is not output, troubleshooting is complete.
A
|
|
|
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) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(e) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(f) Read the DTCs.
Powertrain > Engine and ECT > Trouble Codes
Result
|
Proceed to
|
DTC P10A0 or P1055 is output
|
A
|
DTCs are not output
|
B
|
B |
|
END
|
A
|
|
|
3.
|
PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VALVEMATIC(ENG OFF))
|
(a) Remove the continuously variable valve lift controller assembly from the camshaft housing sub-assembly.
Click here
(b) Reconnect the continuously variable lift controller assembly connector.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VALVEMATIC(ENG OFF) / Data List / VALVEMATIC Current Angle.
Powertrain > Engine and ECT > Active Test
Active Test Display
|
Activate the VALVEMATIC(ENG OFF)
|
Data List Display
|
VALVEMATIC Current Angle
|
(g) When the continuously variable valve lift controller assembly is operated using the Techstream, check whether the shaft moves.
Click here
NOTICE:
-
Make sure to perform the "Activate the VALVEMATIC (ENG OFF)" Active Test with the continuously variable valve lift controller assembly removed from the vehicle.
-
Perform the Active Test with the body of the continuously variable valve lift controller assembly connected to ground, as the continuously variable valve lift controller assembly is grounded through the assembly body.
Techstream Operation
|
Specified Condition
|
Low
|
VALVEMATIC Current Angle is 100 to 120 deg(CA) and shaft extends
|
High
|
VALVEMATIC Current Angle is 250 deg(CA) or more and shaft retracts
|
HINT:
-
If the malfunction does not recur, refer to the engine coolant temperature and intake air temperature recorded in the Freeze Frame Data and perform a simulation test.
-
Perform "Inspection After Repair" after replacing the camshaft housing sub-assembly or continuously variable valve lift controller assembly.
Click here
|