Toyota Yaris: Power Steering System / EPS Warning Light Circuit
DESCRIPTION
Use the following procedure if no DTCs are output but the EPS warning light is illuminated continuously.
The power steering ECU assembly controls the warning light in the combination meter assembly via CAN communication.
CAUTION / NOTICE / HINT
NOTICE:
When the power steering ECU assembly has been replaced, perform Power Steering ECU Initial Setting (assist map writing).
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PROCEDURE
1. | CHECK VEHICLE CONTROL HISTORY (POWER STEERING SYSTEM) |
(a) Enter the following menus: Chassis / EMPS / Utility / Vehicle Control History (RoB).
Chassis > EMPS > Utility
Tester Display |
Vehicle Control History (RoB) |
HINT:
The EPS warning light illuminates if any vehicle control history is stored.
Result | Proceed to |
Vehicle control history not stored for power steering ECU assembly | A |
Vehicle control history stored for power steering ECU assembly | B |
B |
| PERFORM TROUBLESHOOTING AND REPAIR REGARDING VEHICLE CONTROL HISTORY |
A |
| |
2. | INSPECT COMBINATION METER ASSEMBLY |
(a) Perform the Active Test of the combination meter assembly using the GTS.
Body Electrical > Combination Meter > Active Test
Tester Display |
EPS Warning |
(b) Check the combination meter assembly.
OK:
The EPS warning light turns on or off in accordance with the GTS operation.
OK |
| REPLACE POWER STEERING ECU ASSEMBLY |
NG |
| GO TO METER / GAUGE SYSTEM |
PROCEDURE 1. READ VALUE USING GTS (a) Read the Data List according to the display on the GTS. Chassis > EMPS > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note Battery Voltage Drop History Number of times vehicle auxiliary battery voltage dropped Min...
Other information:
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VEHICLE CONTROL HISTORY CHECK VEHICLE CONTROL HISTORY (a) Connect the GTS to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the GTS on. (d) Enter the following menus: Powertrain / Engine / Utility / Vehicle Control History (RoB). Powertrain > Engine > Utility Tester Display Vehicle Control History (RoB) Vehicle Control History (RoB) Item Code Tester Display Measurement Item Diagnostic Note X0600 Auxiliary Battery Voltage Low at Start History of low battery voltage at engine control system start - X0601 Auxiliary Battery Voltage Low at IG OFF History of low battery voltage when ignition switch off - X0602 Auxiliary Battery Discharge at IG OFF History of auxiliary battery becoming discharged when ignition switch off - X0603 Auxiliary Battery Discharge at Running History of auxiliary battery becoming discharged while vehicle being driven - X0606 Auxiliary Battery Voltage Low during Running History of low battery voltage while vehicle being driven - X0607 Auxiliary Battery Voltage High during Running History of high battery voltage while vehicle being driven - CLEAR VEHICLE CONTROL HISTORY (a) Connect the GTS to the DLC3...
Categories
The fuel gauge shows approximately how much fuel is remaining in
the tank when the ignition is switched ON. We recommend keeping
the tank over 1/4 full.

Full
1/4 Full
Empty
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