ECU codes

Good afternoon.

Below is how to enter diagnostics and how to read the flashes.

I also attached a code description list for you to view once you have the code.

Roy

Toyota does not provide Trouble Code driven diagnostic charts for this vehicle. Refer to "Circuit Test Charts" under "Non-Trouble Code Procedures" and testing procedures for the component or system to which the Trouble Code refers. See: Computers and Control Systems > Component Tests and General Diagnostics > Circuit Test Charts (For Trouble Code Diagnosis)
Chart numbers and components or systems related to testing for each Trouble Code are listed below.

Note: Not all Codes are applicable to all models.

Code 12: Refer to Chart 5 and Ignition System testing
Code 13: Refer to Ignition System testing
Code 14: Refer to Chart 7
Code 16: Refer to ECM testing
Code 21: Refer to Oxygen Sensor test under "Circuit Test Charts" and component/circuit testing
Code 22: Refer to Chart 4
Code 24: Refer to Chart 3
Code 25: Refer to Chart 9 and Oxygen Sensor test under "Circuit Test Charts" and component testing
Code 26: Refer to Chart 9 and Oxygen Sensor test under "Circuit Test Charts" and component testing
Code 27: Refer to Oxygen Sensor test under "Circuit Test Charts" and component testing
Code 31: Refer to Chart 3
Code 32: Refer to Chart 3
Code 41: Refer to Chart 2
Code 42: Refer to Vehicle Speed Sensor component testing
Code 43: Refer to Chart 5
Code 51: Refer to Chart 2, A/C Switch circuit, or PNP Switch (A/T) component testing
Code 52: Refer to Knock Sensor component testing
Code 53: Refer to ECM testing
Code 71: Refer to EGR Gas Temp Sensor test under "Circuit Test Charts" and component testing

pulling codes

DIAGNOSIS SYSTEM DESCRIPTION
The Electronic Control Module (ECM) contains a built-in self diagnosis system by which troubles with the engine signal network are detected and a malfunction indicator lamp on the combination meter lights up. By analyzing various signals as shown in the later table the ECM detects system malfunctions relating to the sensors of actuator. The self-diagnosis system has two modes, a normal mode and a test mode.
NORMAL MODE
If a malfunction is detected when in the normal mode, the ECM lights up the malfunction indicator lamp to inform the driver of the occurrence of a malfunction. (For some codes the light does not come on.) The light goes off automatically when the malfunction has been repaired, but the diagnostic trouble code(s) remains stored in the ECM memory (except for code Nos. 43, 51 and 53). The ECM stores the code(s) until it is cleared by removing the EFI fuse with the ignition switch off.
The diagnostic trouble code(s) can be read by the number of blinks of the malfunction indicator lamp when TE1 and E1 terminals on the DLC1 are connected. When 2 or more codes are indicated, the lowest number (code) will appear first.
TEST MODE
A test mode function has been added to the functions of the self-diagnostic system of the normal mode. This function defeats the 2 trip detection logic and narrows the parameters of acceptable tolerance for the purpose of detecting malfunctions such as poor contacts, which are difficult to detect in the normal mode.
If a malfunction is detected when in the test mode, the ECM lights up the malfunction indicator lamp to inform the technician of the occurrence of a malfunction (except for code Nos. 42, 43 and 51). In this case, TE2 and E1 terminals on the DLC1 should be connected.
In the test mode, even if the malfunction is corrected, the malfunction code is stored in the ECM memory even when the ignition switch is off (except code Nos. 42, 43, 51 and 53). This also applies in the normal mode. The diagnostic mode (normal or test) and the output of the malfunction indicator lamp can be selected by connecting the TE1, TE2 and E1 terminals on the DLC1.

ImageZoom/Print

MALFUNCTION INDICATOR LAMP CHECK
1. The malfunction indicator lamp will come on when the ignition switch is placed at ON and the engine is not running.
2. When the engine is started, the malfunction indicator lamp should go off. If the light remains on the diagnosis system has detected a malfunction or abnormality in the system.

2 TRIP DETECTION LOGIC:
Certain DTC's (21, 25, 26, 27 and 71), can be triggered by driving conditions without a malfunction present. To improve self diagnostic reliability, "2nd trip" detection logic is used.
When a fault related to any of the above DTC's is detected, the ECM retains a temporary record of the fault in memory. An actual code is set only if the same fault is recorded during the next ignition/driving cycle.
The malfunction indicator light (MIL) is only illuminated after the "2nd trip."
Because the ECM must see the fault for 2 consecutive trips, the chances of a false code are greatly reduced.

DIAGNOSIS
A specific driving pattern must be followed to recreate a fault code.
Drive the vehicle in the same manner the customer has indicated caused the fault.
Stop vehicle and turn ignition OFF.
Restart vehicle and repeat test-drive.

VERIFICATION OF REPAIR
After repairs, clear ECM memory and follow the same driving pattern used for code detection.

Alldata. You can get a daily, weekly or monthly pass through them.

They have tons of good information.

Roy