Toyota Yaris: Can Communication System / Engine Stop and Start ECU Communication Stop Mode

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

DESCRIPTION

Detection Item	Symptom	Trouble Area
Engine Stop and Start ECU Communication Stop Mode	Communication stop for "Stop and Go/Start" is indicated on the "Communication Bus Check" screen of the GTS. Click here	Engine stop and start ECU branch line or connector Power source circuit of engine stop and start ECU Engine stop and start ECU ground circuit Engine stop and start ECU

Detection Item

Symptom

Trouble Area

Engine Stop and Start ECU Communication Stop Mode

Communication stop for "Stop and Go/Start" is indicated on the "Communication Bus Check" screen of the GTS.

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Engine stop and start ECU branch line or connector
Power source circuit of engine stop and start ECU
Engine stop and start ECU ground circuit
Engine stop and start ECU

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.
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Before measuring the resistance of the CAN bus, turn the engine 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.
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When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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Some parts must be initialized and set when replacing or removing and installing parts.
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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.
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Inspect the fuses for circuits related to this system before performing the following procedure.

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 (ENGINE STOP AND START ECU BRANCH LINE)

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

(b) Disconnect the engine stop and start ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
H43-13 (CANH) - H43-14 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to Engine Stop and Start ECU)

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (ENGINE STOP AND START ECU)

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the engine stop and start ECU connectors.

(b) Measure the resistance according to the value(s) in the table below.

Front view of wire harness connector

(to Engine Stop and Start ECU)

Standard Resistance:

Tester Connection	Condition	Specified Condition
A66-8 (GND1) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
A66-2 (GND2) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
A67-6 (DGND) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A66-3 (BIN1) - Body ground	Always	9.5 to 14 V
A66-1 (BIN2) - Body ground	Always	9.5 to 14 V
A67-1 (+B) - Body ground	Ignition switch ON	9.5 to 14 V
H43-21 (IGR) - Body ground	Ignition switch ON	9.5 to 14 V
H43-18 (IGP) - Body ground	Ignition switch ON	9.5 to 14 V
H43-19 (ACC) - Body ground	Ignition switch ACC	9.5 to 14 V

REPLACE ENGINE STOP AND START ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

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