Toyota RAV4 manuals

Toyota RAV4 Service Manual: Communication malfunction no. 1

Toyota RAV4. Communication malfunction no. 1


Description

This dtc is output when a communication error occurs between the transponder key amplifier and transponder key ecu. Some possible reasons for the communication error are: 1) 2 or more ignition keys are positioned too close together, or 2) noise is occurring in the communication line.

Toyota RAV4. Communication malfunction no. 1


Wiring diagram

Toyota RAV4. Communication malfunction no. 1


Inspection procedure

  1. Check key

Toyota RAV4. Check key


  1. Check if the ignition key being used is near other ignition keys. Also, check if the key ring is in contact with the key grip.

Result:




  1. Check for dtc

  1. Separate the keys from each other and / or remove the key ring.
  2. Clear the dtc (see page ei-18).
  3. Insert a key into the ignition key cylinder. Remove it.

    Repeat for all other keys.

  4. Check that no dtc is output.

Ok: no dtc is output.



  1. Check transponder key ecu (noise)

Toyota RAV4. Check transponder key ecu (noise)


  1. Using an oscilloscope or the intelligent tester, check for noise in the waveform between the terminals of the e5 amplifier connector and e46 ecu connector.

Ok: no noise is present (see illustration).




  1. Check wire harness (transponder key ecu - transponder key amplifier)

Toyota RAV4. Check wire harness (transponder key ecu - transponder key amplifier)


  1. Disconnect the e46 ecu connector.
  2. Disconnect the e5 amplifier connector.
  3. Measure the resistance of the wire harness side connectors.

Standard resistance




  1. Check transponder key amplifier (operation)

  1. Temporarily replacing the transponder key amplifier with a new or normally functioning one.
  2. Check that the engine starts normally.

Ok: engine starts.



End (transponder key amplifier is defective)

Communication
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Engine immobiliser system malfunction
Description This dtc is output when one of the following occurs: 1) the ecm detects errors in its own communications with the transponder key ecu; 2) the ecm detects errors in the communicat ...

Other materials:

Emission inspection and maintenance (i/m) programs
Some states have vehicle emission inspection programs which include obd (on board diagnostics) checks. The obd system monitors the operation of the emission control system. If the malfunction indicator lamp comes on The obd system determines that a problem exists somewhere in the emission contr ...

Installation
Install ecm Install the 2 brackets to the ecm with the 4 screws. Torque: 3.0 N*m (30 kgf*cm, 27 in.*Lbf) Connect the 2 ecm connectors. Notice: When connecting the connector, make sure that dirt, water and other foreign matter does not become stuck between the connector and ...

Checking monitor status
Perform monitor drive pattern Connect the intelligent tester to the dlc3. Turn the ignition switch and the tester on. Clear the dtcs (see page es-35). Run the vehicle in accordance with the applicable drive pattern described in readiness monitor drive pattern (see page es-19). Do ...

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