Toyota Yaris: Can Communication System / Skid Control ECU Communication Stop Mode
DESCRIPTION
Detection Item | Symptom | Trouble Area |
Skid Control ECU Communication Stop Mode | Communication stop for "Skid Control (ABS/VSC/TRAC)" is indicated on the "Communication Bus Check" screen of the GTS. Click here
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Brake actuator assembly branch line or connector
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Power source circuit of brake actuator assembly
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Brake actuator assembly ground circuit
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Brake actuator assembly
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
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Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
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When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
1. | CHECK FOR OPEN IN CAN BUS LINES (BRAKE ACTUATOR ASSEMBLY BRANCH LINE) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the brake actuator assembly connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection | Condition | Specified Condition | A108-22 (CANH) - A108-10 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 54 to 69 Ω | |
| *a | Front view of wire harness connector (to Brake Actuator Assembly) | | |
NG |
| REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (BRAKE ACTUATOR ASSEMBLY) |
OK |
| |
2. | CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection | Condition | Specified Condition | A108-25 (GND1) - Body ground | Cable disconnected from negative (-) auxiliary battery terminal | Below 1 Ω | A108-1 (GND2) - Body ground | Cable disconnected from negative (-) auxiliary battery terminal | Below 1 Ω | |
| *a | Front view of wire harness connector (to Brake Actuator Assembly) | | |
(b) Reconnect the cable to the negative (-) auxiliary battery terminal.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
A108-13 (BM) - Body ground | Ignition switch off | 11 to 14 V |
A108-38 (+BS) - Body ground | Ignition switch off | 11 to 14 V |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
OK |
| |
3. | CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection | Condition | Specified Condition | A108-12 (IGR) - Body ground | Ignition switch ON | 10.5 to 16 V | |
| *a | Front view of wire harness connector (to Brake Actuator Assembly) | | |
OK |
| REPLACE BRAKE ACTUATOR ASSEMBLY |
NG |
| GO TO STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT) |
DESCRIPTION Symptom Trouble Area Check CAN Communication Connection
CAN main bus line, CAN branch line or connector
Power source circuit of central gateway ECU (network gateway ECU)
Central gateway ECU (network gateway ECU) ground circuit
Central gateway ECU (network gateway ECU)
Power source circuit of DLC3
DLC3 ground circuit
WIRING DIAGRAM
CAUTION / NOTICE / HINT CAUTION: When performing the confirmation driving pattern, obey all speed limits and traffic laws...
DESCRIPTION Detection Item Symptom Trouble Area Air Conditioning Amplifier Communication Stop Mode Communication stop for "Air Conditioning Amplifier" is indicated on the "Communication Bus Check" screen of the GTS...
Other information:
DESCRIPTION The battery state sensor assembly detects the voltage, current and temperature of the auxiliary battery. The charging condition is calculated from the voltage and current and output to the ECM. The ECM sends an instruction to generate voltage to the generator assembly based on that signal...
DESCRIPTION These DTCs are stored when a malfunction occurs in the CAN communication circuit. DTC No. Detection Item DTC Detection Condition Trouble Area U010087 Lost Communication With ECM/PCM "A" Missing Message When the stereo component equalizer assembly detects a CAN communication malfunction in the engine system for 1 second or more continuously 3 seconds after the ignition switch is turned to ON* CAN communication system U012987 Lost Communication With Brake System Control Module Missing Message When the stereo component equalizer assembly detects a CAN communication malfunction in the brake system for 1 second or more continuously 3 seconds after the ignition switch is turned to ON* CAN communication system U014087 Lost Communication with Body Control Module Missing Message When the stereo component equalizer assembly detects a CAN communication malfunction in the main body ECU for 3 seconds or more continuously 3 seconds after the ignition switch is turned to ON* CAN communication system HINT: *: Malfunction monitoring is not performed under the following conditions, in order to prevent erroneous detection...
Categories

Smart key
Auxiliary key
Key code number plate
To use the auxiliary key, press the knob and pull out the auxiliary key
from the smart key.

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