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
| -
Power steering ECU assembly main line or connector
-
Power source circuit of power steering ECU assembly
-
Power steering ECU assembly ground circuit
-
Power steering ECU assembly
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
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 (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 |
| |
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) |
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...
DESCRIPTION Detection Item Symptom Trouble Area Steering Angle Sensor Communication Stop Mode Communication stop for "Spiral cable (Steering Angle Sensor)" is indicated on the "Communication Bus Check" screen of the GTS...
Other information:
DESCRIPTION The steering sensor receives the turn signal switch information and controls the turn signal lights. WIRING DIAGRAM
PROCEDURE 1. READ VALUE USING GTS (a) Read the Data List according to the display on the GTS. Chassis > Steering Angle Sensor > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note Turn Signal Switch (Right) Turn signal switch (right) signal OFF or ON OFF: Turn signal switch not in right turn position ON: Turn signal switch in right turn position - Turn Signal Switch (Left) Turn signal switch (left) signal OFF or ON OFF: Turn signal switch not in left turn position ON: Turn signal switch in left turn position - Cornering Light/Front Side Illuminate Light Switch Turn signal switch (full turn) signal OFF or ON OFF: Turn signal switch not in left or right turn position ON: Turn signal switch in left or right full turn position - OK: Normal conditions listed above are displayed...
GENERAL INFORMATION
A large number of ECU controlled systems are used in this vehicle. In general, ECU controlled systems are considered to be very intricate, requiring a high level of technical knowledge to troubleshoot. However, most problem checking procedures only involve inspecting the ECU controlled system circuits one by 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.
read more