- DTC judgment completed
- System normal
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001HT6N |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [03/2019 - 11/2022] |
| Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P2646,P2647; "A" Rocker Arm Actuator System Performance or Stuck Off Bank 1 ENG; 2020 - 2023 MY Corolla [03/2019 - 11/2022] | ||
|
DTC |
P2646 |
"A" Rocker Arm Actuator System Performance or Stuck Off Bank 1 ENG |
|
DTC |
P2647 |
"A" Rocker Arm Actuator System Stuck On Bank 1 ENG |
DESCRIPTION
The EDU in the continuously variable valve lift controller assembly sends a motor drive request and supplies current to the motor.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Memory |
Note |
|---|---|---|---|---|---|---|
|
P2646 |
"A" Rocker Arm Actuator System Performance or Stuck Off Bank 1 ENG |
When all of the following conditions are met (1 trip detection logic):
|
|
Comes on |
DTC stored |
DTC for Mexico Models - Applies |
|
P2647 |
"A" Rocker Arm Actuator System Stuck On Bank 1 ENG |
When all of the following conditions are met (1 trip detection logic):
|
|
Comes on |
DTC stored |
DTC for Mexico Models - Applies |
Perform the following procedure 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
![2020 MY Corolla [03/2019 - 04/2020]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: DATA LIST / ACTIVE TEST](/t3Portal/stylegraphics/info.gif)
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:
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.
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 removed continuously variable valve lift controller assembly to determine whether the problem is with the continuously variable valve lift controller assembly or camshaft housing sub-assembly.
MONITOR DESCRIPTION
When the EDU in the continuously variable valve lift controller assembly detects that the actuator does not operate even though the EDU commands the actuator to operate and power is supplied to the actuator, a DTC is stored and the MIL is illuminated.
MONITOR STRATEGY
|
Related DTCs |
P2646: VALVEMATIC motor lock (stuck off) P2647: VALVEMATIC motor lock (stuck on) |
|
Required Sensors/Components (Main) |
Continuously variable valve lift controller assembly |
|
Required Sensors/Components (Related) |
- |
|
Frequency of Operation |
Continuous |
|
Duration |
7 seconds or less |
|
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 |
- |
|
Engine coolant temperature |
-20°C (-4°F) or higher |
|
Motor activation |
Active |
|
Engine speed |
300 rpm or higher |
|
Battery voltage |
8 V or higher |
|
VALVEMATIC motor current |
5 A or higher |
TYPICAL MALFUNCTION THRESHOLDS
P2646
|
Both of the following conditions are met |
- |
|
Control shaft stroke during 0.016 seconds |
Less than 0.0117 mm (0.000461 in.) |
|
Motor control duty |
80% or higher |
P2647
|
Both of the following conditions are met |
- |
|
Control shaft stroke during 0.016 seconds |
Less than 0.0117 mm (0.000461 in.) |
|
Motor control duty |
-80% or less |
CONFIRMATION DRIVING PATTERN
- 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: P2646 or P2647.
-
Check the DTC judgment result.
Techstream Display
Description
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 |
HINT:
- Do not disconnect the cable from the negative (-) battery terminal when the power supply of the continuously variable valve lift controller assembly is energized.
-
Because the VALVEMATIC system memorizes settings when the ignition switch is turned off, make sure to wait at least 1 minute after turning the ignition switch off before disconnecting the cable from the negative (-) battery terminal.
If the cable is disconnected from the negative (-) battery terminal when the power supply is energized or within 1 minute after turning the ignition switch off, DTC P2646 may be stored.
- After performing repairs, perform the following procedures and check that DTCs are not output again.
- Also, perform the "Activate the VALVEMATIC(ENG ON)" Active Test and confirm that the VALVEMATIC system is operating normally.
- 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.
- Do not disconnect the cable from the negative (-) battery terminal while power supply voltage is being supplied to the continuously variable valve lift controller assembly.
- Disconnecting the cable from the negative (-) battery terminal while power supply voltage is being supplied to the continuously variable valve lift controller assembly may cause DTC P2646 (Motor Locked) to be stored.
- 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. |
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 |
|---|---|
|
Only DTC P2646 or P2647 is output |
A |
|
DTC P0112, P0113, P0115, P0117 or P0118 is output at the same time as DTC P2646 and/or P2647 |
B |
|
DTC P264A is output |
C |
HINT:
- If an engine coolant temperature sensor malfunction DTC or intake air temperature sensor malfunction DTC is output at the same time as DTC P2646 or P2647, check the corresponding engine coolant temperature sensor or intake air temperature sensor first.
- After repairing the engine coolant temperature sensor or intake air temperature sensor, clear the DTCs, perform a simulation test and check that the engine coolant temperature sensor or intake air temperature sensor DTC is not output.
- When the engine coolant temperature sensor or intake air temperature sensor DTC does not recur but DTC P2646 or P2647 is output again, perform troubleshooting from the next step. If a DTC is not output, troubleshooting is complete.
- If DTC P264A is output at the same time, replace the continuously variable valve lift controller assembly as one or more of the position sensor and/or angle sensor in the continuously variable valve lift controller assembly are malfunctioning.
- After replacing the continuously variable valve lift controller assembly, perform a simulation test and confirm that DTCs are not output.
-
Perform "Inspection After Repair" after replacing the continuously variable valve lift controller assembly.
Click here
| B |
|
GO TO DTC CHART
|
| C |
|
REPLACE CONTINUOUSLY VARIABLE VALVE LIFT CONTROLLER ASSEMBLY
|
|
|
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 P2646 or P2647 is output |
A |
|
DTC P264A is output |
B |
|
DTCs are not output |
C |
HINT:
- If DTC P264A is output, replace the continuously variable valve lift controller assembly as the position sensor and/or angle sensor are malfunctioning.
-
Perform "Inspection After Repair" after replacing the continuously variable valve lift controller assembly.
Click here
| B |
|
REPLACE CONTINUOUSLY VARIABLE VALVE LIFT CONTROLLER ASSEMBLY
|
| C |
|
END |
|
|
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 valve lift controller assembly connector.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch to ON (do not start the engine).
(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 that the shaft moves.
Click here
HINT:
- 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 body.
OK
|
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 continuously variable valve lift controller assembly or camshaft housing sub-assembly.
Click here
| OK |
|
REPLACE CAMSHAFT HOUSING SUB-ASSEMBLY
|
| NG |
|
REPLACE CONTINUOUSLY VARIABLE VALVE LIFT CONTROLLER ASSEMBLY
|
|
|