Toyota Yaris: Stop And Start System / ECU Internal Error (P164400)

HINT:

• If the cable is disconnected from the auxiliary battery terminal, stop and start control is prohibited until refresh charge is completed.

  In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item Status of Auxiliary Battery Charge Control changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the auxiliary battery fluid temperature at 11°C (52°F) or higher, the refresh charge will be completed.)

• If the GTS is not available and the Data List item Status of Auxiliary Battery Charge Control cannot be checked, charge the auxiliary battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.

  If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.

• After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.
• Allow the engine to idle for 3 minutes after it is warmed up and check that the engine idle speed is within 50 rpm of the target idle speed.

NOTICE:

• Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.

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• After replacing the engine stop and start ECU, perform learning of the external backup boost converter (eco run vehicle converter assembly).

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• After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.

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• Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

• Using the GTS, read the freeze frame data before troubleshooting. System condition information is recorded as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting.

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• If DTCs P060B1C (Analog to Digital Converter Circuit Voltage Out of Range), P060B49 (Analog to Digital Converter Internal Electronic Failure) or P060B71 (Analog to Digital Converter Actuator Stuck) and P164400 (ECU Internal Error) are output simultaneously,, perform troubleshooting for DTC P060B1C, P060B49 or P060B71 first as it may have caused DTC P164400 to be stored.

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• If DTCs P061519 (Starter Relay Circuit Current Above Threshold) and P164400 (ECU Internal Error) are output simultaneously, perform troubleshooting for DTC P061519 first as it may have caused DTC P164400 to be stored.

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• For wire harness and connector inspection procedures and precautions, refer to " "
• DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.

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Charging Control System (P160F00)

DESCRIPTION If the engine stop and start ECU receives a charging control malfunction signal from the ECM, it will blink the stop and start cancel indicator and store DTC P160F00...

Starter Circuit Stuck On (P16449E)

DESCRIPTION The engine stop and start ECU detects abnormalities in the DI (+B) value that is input from the integrated IC (stop and start backup boost converter integrated IC) to the CPU...

Other information:

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Precaution

PRECAUTION HANDLING PRECAUTION (a) Always ensure that the ignition switch is off before removing the brake actuator assembly or a sensor unless specifically instructed by the repair manual. (b) When replacing the brake actuator assembly, always replace it with a new one...

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Reassembly

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