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

Other materials:

1. INSTALL SPARK PLUG (a) Install the 6 spark plugs. Torque: 18 N*m (183 kgf*cm, 13 ft.*lbf) 2. INSTALL IGNITION COIL ASSEMBLY (a) Install the 6 ignition coils with the 6 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) (b) Connect the 6 ignition coil connectors. 3. INSTALL NO. 1 SUR ...

Front Speed Sensor RH Circuit
DESCRIPTION The speed sensor detects wheel speed and transmits the appropriate signals to the ECU. These signals are used for control of the ABS control system. The front and rear rotors have 48 serrations each. When the rotors rotate, the magnetic field generated by the permanent magne ...

1. INSTALL RADIO NO. 2 BRACKET  Install radio No. 2 bracket with the 4 screws. 2. INSTALL RADIO NO. 1 BRACKET  Install radio No. 1 bracket with the 4 screws. 3. INSTALL RADIO RECEIVER  Connect the connector.  Install the radio receiver with the 4 scr ...

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