Toyota RAV4 Service Manual: Solenoid circuit

Description

This solenoid is turned on in accordance with signals from the skid control ecu and controls the pressure on the wheel cylinders to control the braking force.

The solenoid and solenoid relay are built into the abs and traction actuator.

Hint:

Dtcs c0226/21, c0236/22, c0246/23, c0256/24 and c1225/25: the skid control ecu begins to detect these dtcs when the vehicle speed exceeds 6 km/h (4 mph).

Wiring diagram

Inspection procedure

1. Reconfirm dtc

1. Clear the dtc(s) (see page bc-47).
2. Start the engine.
3. Drive the vehicle at 6 km/h (4 mph) or more to activate the initial check.
4. Check if the same dtc(s) is output (see page bc-47).

Result 

Hint:

The dtcs may be stored due to a malfunction in the connector terminal.

Replace abs and traction actuator

Description

If a dtc related to the motor line is stored, the vsc fail (fail-safe) relay cuts off the power supply to the vsc mtr relay and performs the fail-safe operation.

While the abs, trc, vsc, or ba is operating, the skid control ecu turns the vsc fail relay on and activates the pump motor in the abs and traction actuator.

These dtcs may be stored if the motor relay (+bm) voltage becomes lower than the dtc detecting condition due to insufficient output from the battery or alternator.

Hint:

Dtcs c0273/13, c0274/14 and c1361/91: the skid control ecu begins to detect these dtcs when the vehicle speed exceeds 6 km/h (4 mph).

Wiring diagram

Inspection procedure

1. Perform active test by intelligent tester (motor relay)

1. Select the active test, generate a control command, and then check that the abs motor relay operates.

Ok: the operation sound of the abs motor can be heard.

2. Inspect fuse (abs1)

1. Remove the abs1 h-fuse from the engine room no. 1 Relay block.
2. Measure the resistance of the fuse.

Standard resistance: below 1

3. Inspect vsc motor relay (marking: vsc mtr)

1. Remove the vsc motor relay from the engine room no.

   1 Relay block.

2. Measure the resistance of the relay.

Standard resistance

4. Inspect fail-safe relay (marking: vsc fail)

1. Remove the faile-safe relay from the engine room no. 1 Relay block.
2. Measure the resistance of the relay.

Standard resistance

5. Check wire harness (fail-safe relay - battery)

1. Remove the fail-safe relay from the engine room no. 1 Relay block.
2. Measure the voltage of the wire harness side connector.

Standard voltage

6. Check engine room no. 1 Relay block (fail-safe relay - vsc motor relay and body ground)

1. Remove the fail-safe and vsc motor relays from the engine room no. 1 Relay block.
2. Measure the resistance of the relay terminals.

Standard resistance

7. Check wire harness (engine room no. 1 Relay block - skid control ecu)

1. Disconnect the a19 ecu connector.
2. Remove the fail-safe and vsc motor relays from the engine room no. 1 Relay block.
3. Measure the resistance of the wire harness connectors.

Standard resistance

8. Reconfirm dtc

1. Clear the dtc(s) (see page bc-47).
2. Start the engine
3. Drive the vehicle at 6 km/h (4 mph) or more to activate the initial check.
4. Check if the same dtc(s) is output (see page bc-47).

Result

Replace abs and traction actuator assembly