Toyota RAV4 (XA40) 2013-2018 Service Manual: Communication
Description
When a key is inserted into the ignition key cylinder but no communication occurs between the key and transponder key ecu, dtc b2796 is output. When a key is inserted into the ignition key cylinder but a communication error occurs between the key and transponder key ecu, dtc b2798 is output.
Wiring diagram
Inspection procedure
- Read value of intelligent tester (engine immobiliser system)
- Connect the intelligent tester (with can vim) to the dlc3.
- Turn the ignition switch on with a key that cannot start the engine.
- On the intelligent tester, enter the following menus: diagnosis / obd/mobd / immobiliser / data list / immobiliser. Read the result.
Ok: unset (key is in ignition key cylinder) appears on the screen.
- Check whether engine starts with other key
- Check whether the engine starts with the vehicle's other keys.
Ok: engine starts.
- Read value of intelligent tester (transponder key coil)
- Connect the intelligent tester (with can vim) to the dlc3.
- Turn the ignition switch on with a key that cannot start the engine.
- On the intelligent tester, enter the following menus: diagnosis / obd/mobd / immobiliser / data list / antenna coil. Read the result.
Ok: normal (transponder key coil is normal) appears on the screen.
- Check wire harness (transponder key ecu - transponder key amplifier)
- Disconnect the e46 ecu connector.
- Disconnect the e5 amplifier connector.
- Measure the resistance of the wire harness side connectors.
Standard resistance 
- Check transponder key amplifier (operation)
- Temporarily replace the transponder key amplifier with a new or normally functioning one..
- Check that the engine starts normally
Ok: engine starts normally.
End (transponder key amplifier is defective)
Unmatched key code
Description
This dtc is output when a key code that has not been registered in the
transponder key ecu is inserted
into the ignition key cylinder.
Inspection procedure
Reregister key
...
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 ...
Other materials:
Battery temperature sensor circuit
Description
The battery temperature sensor installed on the battery current sensor
detects battery temperature.
A thermistor is integrated into the battery temperature sensor, and the
resistance in the battery
temperature sensor changes according to the battery temperature.
The r ...
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 ...
Headlight relay
On-vehicle inspection
Remove headlight relay
Remove the headlight relay from the engine room
no. 2 Relay block.
Measure the resistance of the relay.
Standard resistance
If result is not as specified, replace the relay. ...
