Toyota RAV4 manuals

Toyota RAV4 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:

Diagnosis system
Check dlc3 Check the dlc3: the power steering ecu uses can (iso11898-1) and iso9141-2 for communication protocol. The terminal arrangement of the dlc3 complies with sae j1962 and matches the iso9141-2 format. Notice: *: Before measuring the resistance, leave the vehicle ...

Mil circuit
Description The mil (malfunction indicator lamp) is used to indicate vehicle malfunction detections by the ecm. When the ignition switch is turned on, power is supplied to the mil circuit, and the ecm provides the circuit ground which illuminates the mil. The mil operation can be checked ...

Front airbag sensor lh circuit malfunction
Description The front airbag sensor lh consists of the diagnostic circuit, the frontal deceleration sensor, etc. If the center airbag sensor receives signals from the frontal deceleration sensor, it determines whether or not the srs should be activated. Dtc b1615/14 is recorded when a ma ...

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