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:

Inspection
Inspect cylinder head for warpage Using a precision straightedge and feeler gauge, measure the warpage of the contact surfaces of the cylinder block and manifolds. Maximum warpage: 0.08 Mm (0.0032 In.) If the warpage is greater than the maximum, replace the cylinder head sub-a ...

Front axle hub
Components (2005/11-2006/01) Components (2006/01- ) On-vehicle inspection Check front axle hub bearing Remove the front wheel. Disconnect the front disc brake cylinder (see page br-40). Remove the front disc. Inspect the axle hub backlash. Using a dial indicator ...

Registration
Notice: The vehicle identification number (vin) must be input into the replacement ecm. Hint: The vin is a 17-digit alphanumeric number. The intelligent tester is required to register the vin. Description This registration section consists of 3 parts: input instructions, read vin and wr ...

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