Toyota Yaris: Can Communication System / Certification ECU Communication Stop Mode

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Power Source & Network / Networking / Can Communication System / Certification ECU Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Certification ECU Communication Stop Mode	Communication stop for "Certification (Smart) and/or Power Management" is indicated on the "Communication Bus Check" screen of the GTS.	Certification ECU (smart key ECU assembly) branch line or connector Power source circuit of certification ECU (smart key ECU assembly) Certification ECU (smart key ECU assembly) ground circuit Certification ECU (smart key ECU assembly)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

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

NOTICE:

Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
Click here
Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
Click here
Some parts must be initialized and set when replacing or removing and installing parts.
Click here
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.
Before replacing the certification ECU (smart key ECU assembly), refer to Registration.
Click here

HINT:

Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
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 (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) BRANCH LINE)

(a) Disconnect the cable from the negative (-) auxiliary battery terminal.

(b) Disconnect the certification ECU (smart key ECU assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
H46-1 (CANH) - H46-2 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

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
H46-29 (E) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))

(b) Reconnect the cable to the negative (-) auxiliary battery terminal.

Standard Voltage:

Tester Connection	Condition	Specified Condition
H46-6 (+B) - Body ground	Ignition switch off	11 to 14 V

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

Combination Meter ECU Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Combination Meter ECU Communication Stop Mode Communication stop for "Combination Meter" is indicated on the "Communication Bus Check" screen of the GTS...

Center Airbag Sensor Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Center Airbag Sensor Communication Stop Mode Communication stop for "Airbag" is indicated on the "Communication Bus Check" screen of the GTS...

Other information:

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Engine Immobiliser System Circuit Short to Battery (B279A12)

DESCRIPTION If the communication line (IMI - EFIO) between the ECM and ID code box (immobiliser code ECU) is stuck high, the ECM will store this DTC. DTC No. Detection Item DTC Detection Condition Trouble Area Note B279A12 Engine Immobiliser System Circuit Short to Battery The communication line (IMI - EFIO) between the ECM and ID code box (immobiliser code ECU) is stuck high...

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Components

COMPONENTS ILLUSTRATION *1 NO. 2 AIR DUCT *2 COOLER PIPE GROMMET *3 COOLER EXPANSION VALVE *4 HEATER CLAMP *5 HEATER RADIATOR UNIT SUB-ASSEMBLY *6 NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY *7 NO. 1 COOLER THERMISTOR *8 UPPER HEATER CASE *9 O-ring *10 LOWER HEATER CASE N*m (kgf*cm, ft...