Toyota Yaris: Can Communication System / Power Steering ECU Communication Stop Mode
DESCRIPTION
Detection Item | Symptom | Trouble Area |
Power Steering ECU Communication Stop Mode | Communication stop for "Power Steering (EPS)" is indicated on the "Communication Bus Check" screen of the GTS. Click here
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Power steering ECU assembly main line or connector
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Power source circuit of power steering ECU assembly
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Power steering ECU assembly ground circuit
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Power steering 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 (POWER STEERING ECU ASSEMBLY MAIN LINE) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the power steering ECU assembly connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection | Condition | Specified Condition | H1-7 (CANH) - H1-8 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 108 to 132 Ω | |
| *a | Front view of wire harness connector (to Power Steering ECU Assembly) | | |
NG |
| REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (POWER STEERING ECU ASSEMBLY) |
OK |
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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 | H2-2 (PGND) - Body ground | Cable disconnected from negative (-) auxiliary battery terminal | Below 1 Ω | |
| *a | Front view of wire harness connector (to Power Steering ECU Assembly) | | |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
OK |
| |
3. | CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) Reconnect the cable to the negative (-) auxiliary battery terminal.
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection | Condition | Specified Condition | H1-1 (IG) - Body ground | Ignition switch ON | 10.5 to 16 V | |
| *a | Front view of wire harness connector (to Power Steering ECU Assembly) | | |
OK |
| REPLACE POWER STEERING ECU ASSEMBLY |
NG |
| GO TO STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT) |
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Other information:
COMPONENTS ILLUSTRATION
*1 DIAPHRAGM OIL SEAL *2 ELECTRO MAGNETIC CONTROL COUPLING SUB-ASSEMBLY *3 ELECTRO MAGNETIC CONTROL COUPLING WIRE HARNESS *4 TRANSMISSION COUPLING CONICAL SPRING WASHER *5 TRANSMISSION COUPLING SPACER *6 REAR DIFFERENTIAL DRAIN PLUG *7 REAR DIFFERENTIAL FILLER PLUG *8 GASKET *9 REAR DIFFERENTIAL CARRIER ASSEMBLY - -
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CAUTION / NOTICE / HINT NOTICE:
When replacing the combination meter assembly, always replace it with a new one...
Categories
Before refueling, close all the doors, windows, and the liftgate/trunk
lid, and switch the ignition OFF.
To open the fuel-filler lid, pull
the remote fuel-filler lid release.
To remove the fuel-filler cap, turn it counterclockwise.
Attach the removed cap to the
inner side of the fuel-filler lid.
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