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

When the diagnosis system is changed from normal mode to check mode or vice versa, all DTCs and Freeze Frame Data recorded in normal mode are cleared. Before changing modes, always check and make a note of DTCs and Freeze Frame Data.

HINT:

DTCs which are stored in the ECM can be displayed on the Techstream. The Techstream can display the current, pending and permanent DTCs.
If a malfunction is detected during the current driving cycle, current and permanent DTCs are stored.
Some DTCs are not stored if the ECM does not detect the same malfunction again during a second consecutive driving cycle. However, such malfunctions, detected on only one occasion, are stored as pending DTCs.
Current and pending DTCs can be cleared by using the Techstream or by disconnecting the cable from the negative (-) battery terminal. However, permanent DTCs cannot be cleared using either of these two methods.
After clearing current DTCs using the Techstream (or by disconnecting the cable from the negative (-) battery terminal), permanent DTCs can be cleared when the system is determined to be normal for the relevant DTCs and then the universal trip is performed. The driving pattern to obtain a normal judgment is described under the "Confirmation Driving Pattern" for the respective DTC.

2 Trip Detection Examples

HINT:

Obtaining a normal judgment and performing a universal trip driving pattern can be done in the same driving cycle or in different driving cycles.
It is unnecessary to obtain a normal judgment if the DTCs are misfire or fuel system DTCs.

Powertrain > Engine and ECT > Trouble Codes

Powertrain > Engine and ECT > Clear DTCs

After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

(1) Disconnect the cable from the negative (-) battery terminal for more than 1 minute.

(2) Remove the EFI-MAIN NO. 1 and ETCS fuses from the engine room relay block and junction block assembly located inside the engine compartment for more than 1 minute.

Even if the following procedure is not performed, permanent DTCs are cleared by obtaining a normal judgment during 3 consecutive driving cycles.

Powertrain > Engine and ECT > Trouble Codes

If permanent DTCs are not output, it is not necessary to continue this procedure.

Powertrain > Engine and ECT > Clear DTCs

(g) Perform the respective confirmation driving patterns in order to obtain a normal judgment for the output DTCs.

HINT:

Confirmation driving patterns do not need to be performed for misfire and fuel system DTCs.
For the confirmation driving pattern, refer to the procedures for the relevant DTC.
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The driving pattern to obtain a normal judgment and the universal trip driving can be performed consecutively in the same driving cycle.

Idle the engine for 30 seconds or more.
Drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more.
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

It is possible to complete the drive pattern even if the vehicle decelerates to less than 40 km/h (25 mph) during the driving cycle provided that the vehicle is driven at 40 km/h (25 mph) or more for a total of 5 minutes.
Allow 10 minutes or more to elapse from the time the engine is started.