Toyota Yaris: How To Troubleshoot Ecu Controlled Systems / General Information

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / General / Introduction / How To Troubleshoot Ecu Controlled Systems / General Information

GENERAL INFORMATION

  • A large number of ECU controlled systems are used in this vehicle. In general, ECU controlled systems are considered to be very intricate, requiring a high level of technical knowledge to troubleshoot. However, most problem checking procedures only involve inspecting the ECU controlled system circuits one by one. An adequate understanding of the system and a basic knowledge of electricity is enough to perform effective troubleshooting, accurate diagnosis and necessary repairs.
  • When using the GTS
    • Before using the GTS, read the operator's manual thoroughly.
    • If the GTS cannot communicate with the ECU controlled systems when connected to the DLC3 with the ignition switch ON and the GTS on, there is a problem on the vehicle side or the GTS side.
      1. If communication is possible when the GTS is connected to another vehicle, inspect the diagnosis data link line (bus (+) line), CANH and CANL lines, and the power source circuits of the vehicle ECUs.
      2. If communication is still not possible when the GTS is connected to another vehicle, the problem is probably in the GTS itself. Perform the Self Test procedure outlined in the GTS operator's manual.

TROUBLESHOOTING PROCEDURES

  • The troubleshooting procedures consist of diagnostic procedures for when a DTC is stored and diagnostic procedures for when no DTCs are stored. The basic idea is explained in the following table.

    Procedure Type

    Details

    Troubleshooting Method

    DTC Based Diagnosis

    The diagnostic procedure is based on the DTC that is stored.

    The malfunctioning part is identified based on the DTC detection conditions using a process of elimination.

    The possible trouble areas are eliminated one-by-one using the GTS and inspection of related parts.

    Symptom Based Diagnosis

    (No DTCs stored)

    The diagnostic procedure is based on problem symptoms.

    The malfunctioning part is identified based on the problem symptoms using a process of elimination.

    The possible trouble areas are eliminated one-by-one using the GTS and inspection of related parts.

  • Vehicle systems are complex and use many ECUs that are difficult to inspect independently. Therefore, a process of elimination is used, where components that can be inspected individually are inspected, and if no problems are found in these components, the related ECU is identified as the problem and replaced.
  • It is extremely important to ask the customer about the environment and the conditions present when the problem occurred (Customer Problem Analysis). This makes it possible to simulate the conditions and confirm the symptom. If the symptom cannot be confirmed or the DTC does not recur, the malfunctioning part may not be identified using the troubleshooting procedure, and the ECU for the related system may be replaced even though it is not defective. If this happens, the original problem will not be solved.
  • In order to prevent endless expansion of troubleshooting procedures, the troubleshooting procedures are written with the assumption that multiple malfunctions do not occur simultaneously for a single problem symptom.
  • To identify the malfunctioning part, troubleshooting procedures narrow down the target by separating components, ECUs and wire harnesses during the inspection. If the wire harness is identified as the cause of the problem, it is necessary to inspect not only the connections to components and ECUs but also all of the wire harness connectors between the component and the ECU.

DESCRIPTION

(a) The data of each system and Diagnostic Trouble Codes (DTCs) can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the GTS to check for malfunctions and perform repairs.

CHECK DLC3

(a) The vehicle ECUs use ISO 15765-4 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

7 (SIL) - 5 (SG)

Bus "+" line

During transmission

Pulse generation

4 (CG) - Body ground

Chassis ground

Always

Below 1 Ω

5 (SG) - Body ground

Signal ground

Always

Below 1 Ω

16 (BAT) - Body ground

Auxiliary battery positive

Always

11 to 14 V

6 (CANH) - 14 (CANL)

CAN bus line

Ignition switch off*

54 to 69 Ω

6 (CANH) - 4 (CG)

HIGH-level CAN bus line

Ignition switch off*

200 Ω or higher

14 (CANL) - 4 (CG)

LOW-level CAN bus line

Ignition switch off*

200 Ω or higher

6 (CANH) - 16 (BAT)

HIGH-level CAN bus line

Ignition switch off*

6 kΩ or higher

14 (CANL) - 16 (BAT)

LOW-level CAN bus line

Ignition switch off*

6 kΩ or higher

NOTICE:

*: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.

If the result is not as specified, the DLC3 may be malfunctioning. Repair or replace the harness or connector.

    How To Troubleshoot Ecu Controlled Systems

    ..

    Electronic Circuit Inspection Procedure

    ELECTRONIC CIRCUIT INSPECTION PROCEDURE BASIC INSPECTION (a) WHEN MEASURING RESISTANCE OF ELECTRONIC PARTS (1) Unless otherwise stated, all resistance measurements are standard values measured at an ambient temperature of 20°C (68°F)...

    Other information:

    Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Restarting after a Short Period of Time from an Idling Stop


    DESCRIPTION Perform this procedure if the engine restarts after an abnormally short period of time after being stopped by the stop and start system. Regarding explanations of the features of stop and start system control: Click here PROCEDURE 1...

    Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Power Steering Control Module Processor System Internal Failure (C05D604,...,C15D362)


    DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition Note C05D604 Power Steering Control Module Processor System Internal Failure ECU internal malfunction (CPU malfunction) Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C05D646 Power Steering Control Module Processor Calibration / Parameter Memory Failure ECU internal malfunction (EEPROM error) Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C05D649 Power Steering Control Module Processor Internal Electronic Failure ECU internal malfunction (Peripheral circuit malfunction) Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C10001C Control Module Internal Temperature Sensor "A" Circuit Voltage Out of Range ECU temperature sensor "A" range malfunction Power steering ECU assembly EPS warning light: Comes on The ECU judges the system has returned to normal - C152A18 Power Steering Motor "A" Circuit Current Below Threshold Motor "A" low current malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C152A19 Power Steering Motor "A" Circuit Current Above Threshold Motor "A" overcurrent Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C152B18 Power Steering Motor "B" Circuit Current Below Threshold Motor "B" low current malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C152B19 Power Steering Motor "B" Circuit Current Above Threshold Motor "B" overcurrent Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C153A00 Malfunction of Power Steering Motor "A" Inverter Pre-Driver Inverter "A" pre-driver circuit malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C153A19 Power Steering Motor "A" Inverter Circuit Current Above Threshold Inverter "A" short circuit malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C153B00 Malfunction of Power Steering Motor "B" Inverter Pre-Driver Inverter "B" pre-driver circuit malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C153B19 Power Steering Motor "B" Inverter Circuit Current Above Threshold Inverter "B" short circuit malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C154A7E Power Supply & Contrary Connection Protection Relay "A" Actuator Stuck On Contrary connection protection relay "A" short circuit malfunction (initial check) Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C154A7F Power Supply & Contrary Connection Protection Relay "A" Actuator Stuck Off Contrary connection protection relay "A" open circuit malfunction (initial check) Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C154B7E Power Supply & Contrary Connection Protection Relay "B" Actuator Stuck On Contrary connection protection relay "B" short circuit malfunction (initial check) Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C154B7F Power Supply & Contrary Connection Protection Relay "B" Actuator Stuck Off Contrary connection protection relay "B" open circuit malfunction (initial check) Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C157A11 Power Steering Motor "A" Current Sensor Circuit Short to Ground Motor "A" current sensor low voltage malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C157A62 Power Steering Motor "A" Current Sensor Signal Compare Failure Motor "A" current sensor correlation malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C157B11 Power Steering Motor "B" Current Sensor Circuit Short to Ground Motor "B" current sensor low voltage malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C157B62 Power Steering Motor "B" Current Sensor Signal Compare Failure Motor "B" current sensor correlation malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C15D11C Power Steering Motor Position Sensor "A" Circuit Voltage Out of Range Rotation angle sensor "A" range malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C15D162 Power Steering Motor Position Sensor "A" Signal Compare Failure Rotation angle sensor "A" correlation malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C15D21C Power Steering Motor Position Sensor "B" Circuit Voltage Out of Range Rotation angle sensor "B" range malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C15D262 Power Steering Motor Position Sensor "B" Signal Compare Failure Rotation angle sensor "B" correlation malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C15D31C Power Steering Motor Position Sensor "C" Circuit Voltage Out of Range Rotation angle sensor "C" range malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - C15D362 Power Steering Motor Position Sensor "C" Signal Compare Failure Rotation angle sensor "C" correlation malfunction Power steering ECU assembly EPS warning light: Comes on Ignition switch ON again - CAUTION / NOTICE / HINT NOTICE: When the power steering ECU assembly has been replaced, perform Power Steering ECU Initial Setting (assist map writing)...

    Categories

    Fuel-Filler Lid and Cap

    WARNING

    When removing the fuel-filler cap, loosen the cap slightly and wait for any hissing to stop, then remove it

    Fuel spray is dangerous. Fuel can burn skin and eyes and cause illness if ingested. Fuel spray is released when there is pressure in the fuel tank and the fuel-filler cap is removed too quickly.

    read more

     
    Copyright © 2024 www.toyaris4.com