Toyota RAV4 Service Manual: Low battery positive voltage

Description

When there is an abnormality in the power supply circuit of the brake actuator (skid control ecu), the skid control ecu sets a dtc and the operation is prohibited by the fail-safe function. This dtc is set when the voltage supplied to terminal ig1 is outside the dtc detection threshold, due to abnormalities of the battery, power source circuits or charging circuits such as the alternator circuit.

The fail-safe function is canceled when the voltage to terminal ig1 returns to normal.

Wiring diagram

Inspection procedure

1. Inspect fuse (ecu-ig1)

1. Remove the ecu-ig1 fuse from the instrument panel junction block.
2. Measure the resistance of the fuse.

Standard resistance: below 1

2. Inspect battery

1. Check the battery voltage.

Standard voltage: 11 to 14 v

3. Check wire harness (skid control ecu - battery)

1. Disconnect the a19 ecu connector.
2. Measure the voltage of the wire harness side connector.

Standard voltage

4. Check wire harness (skid control ecu - body ground)

1. Disconnect the a19 ecu connector.
2. Measure the resistance of the wire harness side connector.

Standard resistance 

5. Reconfirm dtc

1. Clear the dtc (see page bc-47).
2. Drive the vehicle at 3 km/h (2 mph) or more for several seconds.
3. Check if the same dtc is output (see page bc-47).

Result

Replace abs and traction actuator assembly