Toyota RAV4 manuals

Toyota Sienna Service Manual: Check and replace ecu

NOTICE: • The connector should not be disconnected from the ECU. Perform the inspection from the backside of the connector on the wire harness side.

• When no measuring condition is specified, perform the inspection with the engine stopped and the ignition switch on.

• Check that the connectors are fully seated. Check for loose, corroded or broken wires.

(a) First, check the ECU ground circuit. If it is faulty, repair it. If it is normal, the ECU could be faulty.

Temporarily replace the ECU with a normally functioning one and check if the symptoms occur. If the trouble symptoms disappear, replace the original ECU.

Measure the resistance between the ECU ground terminal and body ground

(1) Measure the resistance between the ECU ground terminal and body ground.

Standard resistance: Below 1 Ω

Disconnect the ECU connector

(2) Disconnect the ECU connector. Check the ground terminal on the ECU side and wire harness side for bending, corrosion or foreign matter. Lastly, check the contact pressure of the female terminals.

Check for short circuit
(a) If the wire harness is ground shorted (Fig. 5), locate the section by conducting a resistance check with the body ground (below).   (b) Check the resistance with the body ground. ...

How to proceed with troubleshooting
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Other materials:

Rear door lock
INSPECTION 1. INSPECT REAR DOOR LOCK ACTUATOR ASSEMBLY LH  Apply battery voltage to the door lock and check operation of the motor. OK HINT: If the result is not as specified, replace the door lock assembly.  Measure the resistance according to the value(s) in the ...

Short to GND in Driver Side Squib Circuit
DTC B0102/11 Short to GND in Driver Side Squib Circuit DESCRIPTION The driver side squib circuit consists of the center airbag sensor assembly, the spiral cable and the steering pad. The circuit instructs the SRS to deploy when deployment conditions are met. DTC B0102/11 is recorded when ...

Diagnostic trouble code chart
HINT: The parameters listed in the chart may not confirm exactly to those read during the DTC check due to the type of instrument or other factors. If a trouble code is displayed during the DTC check in the check mode, check the circuit for the code listed in the table below. For details of ...

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