| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001GHBP |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 11/2022] |
| Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: Lack of Power or Hesitation; 2020 - 2023 MY Corolla [01/2019 - 11/2022] | ||
|
Lack of Power or Hesitation |
DESCRIPTION
The VALVEMATIC system is able to continuously change the valve lift amount and valve timing. For engines equipped with a VALVEMATIC system, when a part such as a rocker arm in the camshaft housing has mechanical problems, the valve lift amount does not change and problems occur, such as a lack of engine power or rough idling.
CAUTION / NOTICE / HINT
A lack of engine power occurs when the throttle valve is malfunctioning or when there is a clog in the intake or exhaust system. Therefore, during the inspection, confirm that there are no clogs in any parts.
HINT:
- If the throttle valve is malfunctioning, even if the accelerator pedal is fully depressed when the engine is running, the throttle does not fully open.
- If there is a clog in the intake system, even if the accelerator pedal is fully depressed, value for MAP in the Data List is not the same as the atmospheric pressure.
When performing this inspection on a vehicle equipped with VALVEMATIC, perform the following procedures first in order to confirm that there are no VVT system malfunctions.
- Perform VVT system Active Test and confirm that the VVT follows the VVT target.
- If the VVT system Active Test results are normal, perform VALVEMATIC system Active Test.
NOTICE:
When the vehicle is not equipped with VALVEMATIC, even if the VVT system inspection (the inspection that checks if idling becomes unstable when changing the VVT to the most advanced and retarded positions through the Active Test) is performed, it cannot be determined that the malfunction is in the VVT system.
PROCEDURE
|
1. |
CHECK WHETHER DTC 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 |
|---|---|
|
DTCs are not output |
A |
|
DTCs are output |
B |
| B |
|
GO TO DTC CHART
|
|
|
2. |
PERFORM BASIC FUNCTION |
(a) Check the air cleaner filter element sub-assembly.
HINT:
If the air cleaner filter element sub-assembly is dirty, clean or replace it.
(b) Check if there are any clogs in the intake or exhaust system.
(c) Check the ignition timing.
Click here
![2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE MECHANICAL): ENGINE: ON-VEHICLE INSPECTION+](/t3Portal/stylegraphics/info.gif)
(d) Check the fuel pressure.
Click here
(e) Check the spark.
Click here
(f) Measure the cylinder compression pressure.
Click here
|
Result |
Proceed to |
|---|---|
|
Everything normal |
A |
|
Repaired problem area but malfunction recurs |
|
|
Repaired problem area and malfunction does not recur |
B |
HINT:
Perform "Inspection After Repair" after repairing or replacing the intake system, exhaust system, ignition system or engine assembly.
Click here
| B |
|
END |
|
|
3. |
READ VALUE USING TECHSTREAM |
(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 / Data List / AFS Voltage B1S1, O2S B1S2, Short FT B1S1 and Long FT B1S1.
Powertrain > Engine and ECT > Data List
|
Tester Display |
|---|
|
AFS Voltage B1S1 |
|
O2S B1S2 |
|
Short FT B1S1 |
|
Long FT B1S1 |
(e) Read the value while driving the vehicle.
|
Result |
Proceed to |
|---|---|
|
No abnormal values in Data List |
A |
|
Abnormal values in Data List |
B |
| B |
|
CHECK FUEL SYSTEM |
|
|
4. |
PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT SYSTEM (BANK 1)) |
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank1) / Data List / VVT Change Angle #1.
Powertrain > Engine and ECT > Active Test
|
Active Test Display |
|---|
|
Control the VVT System (Bank1) |
|
Data List Display |
|---|
|
VVT Change Angle #1 |
(e) Perform the Active Test. Check that the displacement angle varies.
|
Result |
Proceed to |
|---|---|
|
"VVT Change Angle #1" value changes |
A |
|
"VVT Change Angle #1" value does not change |
B |
| B |
|
CHECK VVT SYSTEM
|
|
|
5. |
PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VALVEMATIC (ENG ON)) |
(a) Connect the Techstream to the DLC3.
(b) Start the engine and warm it up until the engine coolant temperature stabilizes. (Engine coolant temperature 40°C or higher)
(c) Turn the ignition switch off.
(d) Restart the engine.
HINT:
Do not operate the accelerator pedal.
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VALVEMATIC(ENG ON) / Data List / MAP, Coolant Temp, VALVEMATIC Target Angle, VALVEMATIC Current Angle, VALVEMATIC bef Warm Up.
Powertrain > Engine and ECT > Active Test
|
Active Test Display |
|---|
|
Activate the VALVEMATIC(ENG ON) |
|
Data List Display |
|---|
|
MAP |
|
Coolant Temp |
|
VALVEMATIC Target Angle |
|
VALVEMATIC Current Angle |
|
VALVEMATIC bef Warm Up |
(g) Check the Data List "VALVEMATIC bef Warm Up" display is "ON".
HINT:
If "VALVEMATIC bef Warm Up" is not "ON".
- Restart the engine. (Do not operate the accelerator pedal.)
- Perform the Active Test "Activate the VALVEMATIC before Warm Up" to set "VALVEMATIC bef Warm Up" to "ON". (Do not operate the accelerator pedal.)
(h) Set the Active Test "Activate the VALVEMATIC(ENG ON)" to "High" and check that "VALVEMATIC Current Angle" follows "VALVEMATIC Target Angle" and the "MAP" value changes.
Standard:
|
Techstream Operation |
Result |
|---|---|
|
High |
VALVEMATIC Current Angle: 260 deg(CA) MAP: 25 to 40 kPa (3.6 to 5.8 psi) |
(i) Set the Active Test "Activate the VALVEMATIC(ENG ON)" to "OFF", and check that "VALVEMATIC bef Warm Up" returns to "ON".
(j) Set the Active Test "Activate the VALVEMATIC(ENG ON)" to "Low" and check that "VALVEMATIC Current Angle" follows "VALVEMATIC Target Angle" and the "MAP" value changes.
Standard:
|
Techstream Operation |
Result |
|---|---|
|
Low |
VALVEMATIC Current Angle: 106 deg(CA) MAP: 35 to 65 kPa (5.1 to 9.4 psi) |
OK:
When performing the Active Test, "VALVEMATIC Current Angle" follows "VALVEMATIC Target Angle" and the "MAP" value changes.
HINT:
- After the accelerator pedal is depressed and the Active Test operates once to "Low", "VALVEMATIC bef Warm Up" does not return to "ON". Therefore, in order to repeat the inspection, it is necessary to either perform the Active Test "Activate the VALVEMATIC before Warm Up" to set the VALVEMATIC system to the operating position that occurs before the engine is warmed up, or restart the engine.
- When the vehicle is driven while there is a malfunction in the VALVEMATIC system and the valve lift amount is fixed at the minimum, the vehicle speed cannot exceed 30 to 60 km/h (19 to 37 mph).
- If the intake valve advance angle is within the VALVEMATIC operation prohibition range depending on the operating state of the VVT system, the Active Test "Activate the VALVEMATIC(ENG ON)" is prohibited. If the advance angle cannot be detected due to a malfunction in the VVT system, the Active Test "Activate the VALVEMATIC(ENG ON)" is prohibited.
| OK |
|
PERFORM SIMULATION TEST |
| NG |
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