Toyota RAV4 manuals

Toyota RAV4 (XA40) 2013-2018 Service Manual: Ecm communication circuit malfunction

Toyota RAV4. Ecm communication circuit malfunction


Description

The circuit is used to send trc and vsc control information from the skid control ecu to the ecm, and engine control information from the ecm to the skid control ecu.

Toyota RAV4. Ecm communication circuit malfunction


Inspection procedure

Hint:

Check that the part numbers of the installed ecm and skid control ecu are correct before performing the following procedure.

  1. Reconfirm dtc

  1. Clear the dtc (see page bc-47).
  2. Start the engine.
  3. Check if the same dtc is output (see page bc-47).

Result




Replace ecm

Zero point calibration

Toyota RAV4. Zero point calibration


Description

The abs and traction actuator (skid control ecu) receives signals from the yaw rate and deceleration sensor via the can communication system. The yaw rate sensor has a built-in deceleration sensor and detects the vehicle's condition using 2 circuits (gl1, gl2). If there are problems in the bus lines between the yaw rate and deceleration sensor and the can communication system, dtcs u0123/62 (yaw rate sensor communication trouble) and u0124/95 (deceleration sensor communication trouble) are output.

The dtcs are also output when the calibration has not been completed.

Toyota RAV4. Zero point calibration


Wiring diagram

Toyota RAV4. Wiring diagram


Inspection procedure

Notice:

When replacing the abs and traction actuator, perform the zero point calibration (see page bc- 24).

Hint

When dtc u0123/62, u0124/95 or u0126/63 is output together with dtc c1210/36 or c1336/39, inspect and repair trouble areas indicated by dtc u0123/62, u0124/95 or u0126/63 first.

  1. Check yaw rate sensor installation

  1. Check that the yaw rate sensor has been installed properly (see page bc-211).

Ok: the sensor is tightened to the specified torque.

The sensor is not tilted.



  1. Perform zero point calibration of yaw rate sensor

  1. Perform zero point calibration of the yaw rate and deceleration sensor (see page bc-24).


  1. Reconfirm dtc

  1. Clear the dtc(s) (see page bc-47).
  2. Start the engine.
  3. Drive the vehicle and turn the steering wheel to the right and left at a speed of 45 km/h (28 mph) or more.
  4. Check if the same dtc(s) is recorded (see page bc- 47).

Result


Hint:



Replace abs and traction actuator assembly

Engine control system malfunction
Description If a malfunction in the engine control system is detected, the operations of vsc and trc are prohibited by the fail-safe function. When the signals from the engine are input normal ...

Abs control system malfunction
Description This dtc is output when the vsc system detects a malfunction in the abs system. Inspection procedure Check dtc for abs system Clear the dtc (see page bc-47). Turn t ...

Other materials:

Front seat concentrated airflow mode (S-FLOW)
This function automatically controls the air conditioning airflow so that priority is given to the front seats. Unnecessary air conditioning is suppressed, contributing to increased fuel efficiency. Front seat concentrated airflow mode operates in the following situations. No passengers are detec ...

Ambient temperature sensor circuit
Description The ambient temperature sensor is installed in the front part of the condenser to detect the ambient temperature and control the air conditioner. The sensor is connected to the combination meter and detects fluctuations in the ambient temperature. This data is used for contr ...

Drl relay circuit
Description The main body ecu controls the daytime running light no. 2 Relay (marking: drl no.2). Wiring diagram Inspection procedure Inspect daytime running light relay (marking: drl no. 2, Drl no. 3, Drl no. 4) Remove the no. 2 Relay, no. 3 Relay and no. 4 Relay from th ...

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