Toyota Yaris: Can Communication System / 4WD Control ECU Communication Stop Mode
DESCRIPTION
Detection Item | Symptom | Trouble Area |
4WD Control ECU Communication Stop Mode | Communication stop for "Four Wheel Drive Control" is indicated on the "Communication Bus Check" screen of the GTS. Click here
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4WD ECU assembly branch line or connector
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Power source circuit of 4WD ECU assembly
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4WD ECU assembly ground circuit
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4WD ECU 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 (4WD ECU ASSEMBLY BRANCH LINE) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the 4WD ECU assembly connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection | Condition | Specified Condition | O120-17 (CANH) - O120-26 (CANL) | Cable disconnected from negative (-) battery terminal | 54 to 69 Ω | |
| *a | Front view of wire harness connector (to 4WD ECU Assembly) | | |
NG |
| REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (4WD ECU 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 | O119-1 (GND) - Body ground | Cable disconnected from negative (-) battery terminal | Below 1 Ω | |
| *a | Front view of wire harness connector (to 4WD ECU Assembly) | | |
(b) Reconnect the cable to the negative (-) battery terminal.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
O119-2 (BSLC) - Body ground | Always | 11 to 14 V |
O119-24 (IG1) - Body ground | Ignition switch ON | 11 to 14 V |
OK |
| REPLACE 4WD ECU ASSEMBLY |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
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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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