Toyota RAV4 Quiz
Introduction

Check and replace ecu

In this manual: Introduction
Introduction — 37Interior — 12Exterior — 432Az-fe engine mechanical — 1552Az-fe ignition — 182Az-fe charging — 232Az-fe emission control — 82az-fe exhaust — 32Az-fe fuel — 72Az-fe lubrication — 4Brake — 17Brake control — 63U140f automatic transaxle — 59Instrument panel — 8Suspension — 18Drive shaft — 23Axle — 6Tire and wheel — 30Air conditioning — 93Lighting — 45Cruise control — 21Differential — 12Door lock — 31Engine immobiliser — 21Horn — 5Can communication — 27Mirror — 5Parking brake — 5Power steering — 27Propeller shaft — 3Seat — 29Seat belt — 27Sliding roof — 25Steering column — 6Wiper and washer — 11Supplemental restraint system — 95Other system — 5Maintenance — 14
~1min read
Notice:
  • The connector should not be disconnected from the ecu. Perform the inspection from the backside of the connector on the wire harness side.
  • When no measuring condition is specified, perform the inspection with the engine stopped and the ignition switch on.
  • Check that the connectors are fully seated. Check for loose, corroded or broken wires.
Toyota RAV4. Check and replace ecu

  1. First, check the ecu ground circuit. If it is faulty, repair it. If it is normal, the ecu could be faulty.

Temporarily replace the ecu with a normally functioning one and check if the problem symptoms occur. If the problem symptoms disappear, replace the original ecu.

  1. Measure the resistance between the ecu ground terminal and body ground.

Standard resistance: Below 1 ù

  • Disconnect the ecu connector. Check the ground terminal on the ecu side and wire harness side for bending, corrosion or foreign matter. Lastly, check the contact pressure of the female terminals.

    • Test yourself

    A quick Toyota RAV4 quiz: every answer comes with an explanation and a link to the manual page.