Toyota RAV4 (XA40) 2013-2018 Service Manual: Eps warning light circuit
Description
If the power steering ecu detects a malfunction, the p/s warning light comes
on. At this time, the power
steering ecu stores a dtc in its memory.
Wiring diagram

Inspection procedure
- Check for dtc
- Using the intelligent tester (with can vim), check for
dtcs and confirm that there are no problems in the can
communication system.
Ok:
can dtcs are not output.


- Read value of intelligent tester (ig power supply)
- Connect the intelligent tester (with can vim) to the
dlc3.
- Turn the ignition switch on and press the intelligent
tester main switch on.
- Select the item "ig supply" in the data list and read
the value displayed on the intelligent tester.
Main body ecu


- Inspect fuse (ecu-ig1)
- Remove the ecu-ig1 fuse from the instrument panel
junction block.
- Measure the resistance of the fuse.
Ok:
below 1 

- Check wire harness (battery - power steering ecu and body ground)

- Disconnect the a1 and e18 power steering ecu
connector.
- Measure the voltage of the wire harness side
connectors.
Standard voltage



- Perform active test by intelligent tester
- Connect the intelligent tester (with can vim) to the
dlc3.
- Turn the ignition switch on and press the intelligent
tester main switch on.
- Operate the intelligent tester according to the steps on
the display and select the active test.
Combination meter

Ok:
indicator comes on.

Replace power steering ecu
Description
The power steering ecu receives signals from the ecm and the skid control ecu
via the can
communication system.
Hint:
When 2 or more dtcs starting with [u] are output simul ...
Components
Removal
Position front wheels facing straight
ahead
Disconnect cable from negative battery
terminal
Caution:
Wait at least 90 seconds after disconnecting the
cable f ...
Other materials:
Driving the vehicle
The following procedures should be observed to ensure safe
driving:
Starting the engine
Driving
With the brake pedal depressed, shift the shift lever to d.
Release the parking brake.
Gradually release the brake pedal and gently depress the accelerator
pedal to accelerate the vehicle.
...
Parking brake system
Problem symptoms table
Hint:
Use the table below to help determine the cause of the
problem symptom. The potential causes of the symptoms are
listed in order of probability in the "suspected area" column of
the table. Check each symptom by checking the suspected
areas in the order th ...
Speaking on the phone
The following screen is displayed when speaking on the phone.
To adjust the call volume
Select “-” or “+”. You can also adjust the volume using the steering
switches or the volume knob.
To prevent the other party from hearing your voice
Select “mute”.
Inputting tones
When usin ...