Toyota RAV4 (XA40) 2013-2018 Service Manual: Ecm power source circuit
Description
When the ignition switch is turned on, the battery voltage is applied to the
igsw of the ecm. The output
signal from the mrel terminal of the ecm causes a current to flow to the coil,
closing the contacts of the
integration relay (efi main relay) and supplying power to either terminal +b or
+b2 of the ecm.
Wiring diagram

Inspection procedure
- Inspect fuses (p/i, am2, ig2, efi main, ign)

- Remove the p/i fuse, am2 fuse, ig2 fuse and efi main
fuse from the engine room no. 1 Relay block.
- Remove the ign fuse from the instrument panel junction
block.
- Measure the resistance of the fuses.
Standard resistance:
below 1

- Reinstall the fuses.

- Inspect relay (ig2, efi main)
- Remove the integration relay and ig2 relay from the
engine room no. 1 Relay block.
- Measure the resistance between the terminal of the
integration relay.
Standard resistance 

- Measure the resistance between the terminal of the ig2
relay.
Standard resistance 
- Reinstall the relay.

- Check harness and connector (ecm - body ground)
- Disconnect the b30 ecm connector.
- Measure the resistance.
Standard resistance 
- Reconnect the ecm connector.

- Inspect ecm (igsw voltage)
- Disconnect the b30 and a9 ecm connectors.
- Turn the ignition switch on.
- Measure the voltage between the terminals of the b30
and a9 ecm connectors.
Standard voltage 
- Reconnect the ecm connector.


- Check harness and connector (relay block - ecm, ignition switch,
battery)

- Disconnect the a9 ecm connector.

- Disconnect the e3 ignition switch connector.
- Disconnect the battery positive terminal.

- Remove the am2 fuse and ig2 relay.
- Measure the resistance between the terminals.
Standard resistance (check for open)

Standard resistance (check for short)

- Reinstall the relay and fuse.
- Reconnect the connectors.

- Inspect ignition switch (see page es-261)

- Check harness and connector (integration relay - ecm, battery, body
ground)

- Disconnect the a9 ecm connector.

- Remove the integration relay from the engine room no. 1
Relay block.
- Disconnect the integration relay connector.
- Remove the p/i fuse from the engine room no. 1 Relay
block.
- Check the resistance between the terminals.
Standard resistance (check for open)

Standard resistance (check for short)

- Reconnect the connectors.
- Reinstall the integration relay and p/i fuse.


Related dtcs
If any evap system dtcs are set, the malfunctioning area can be determined
using the table below.
Notice:
If the reference pressure difference between the first and second ch ...
Description
The ecm constantly generates 5 v power from the battery voltages supplied to
the +b (batt) terminal to
operate the microprocessor. The ecm also provides this power to the sensors
thr ...
Other materials:
Air conditioning filter
The air conditioning filter
must be changed regularly
to maintain air conditioning
efficiency.
Removal method
1. Turn the engine switch to
OFF.
2. Open the glove box and slide
off the damper.
3. Push in each side of the
glove box to disconnect the
claws, and then slowly and
fully open the glove bo ...
Air inlet control servo motor
Components
Removal
Remove blower assembly
Remove the blower (see page ac-203).
Remove air inlet control servo motor (see
page ac-210)
Inspection
Inspect air inlet control servo motor (for automatic air conditioning
system)
Inspect the servo motor operation. ...
Maintenance data
(fuel, oil level, etc.)
Dimensions and weights
*: Unladen vehicle
Vehicle identification
Vehicle identification number
The vehicle identification number (vin) is the legal identifier for
your vehicle. This is the primary identification number for your
toyota. It is used in registering the ownership of your vehicl ...