Toyota RAV4 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

1. Check for dtc

1. 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.

2. Read value of intelligent tester (ig power supply)

1. Connect the intelligent tester (with can vim) to the dlc3.
2. Turn the ignition switch on and press the intelligent tester main switch on.
3. Select the item "ig supply" in the data list and read the value displayed on the intelligent tester.

Main body ecu

3. Inspect fuse (ecu-ig1)

1. Remove the ecu-ig1 fuse from the instrument panel junction block.
2. Measure the resistance of the fuse.

Ok: below 1

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

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

Standard voltage

5. Perform active test by intelligent tester

1. Connect the intelligent tester (with can vim) to the dlc3.
2. Turn the ignition switch on and press the intelligent tester main switch on.
3. 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