Toyota RAV4 manuals

Toyota Sienna Service Manual: Check for open circuit

(a) For an open circuit in the wire harness in Fig. 1, the resistance or voltage, as described below.

For an open circuit in the wire harness, the resistance or voltage, as described below

(b) Check the resistance.

Disconnect connectors A and C and measure
 Check the resistance

Standard resistance (Fig. 2)

HINT:

Measure the resistance while lightly shaking the wire harness vertically and horizontally. If the results match the examples above, an open circuit exists between terminal 1 of connector A and terminal 1 of connector C.

(2) Disconnect connector B and measure the resistance between the terminals of the connectors.

Disconnect connector B and measure the resistance between the terminals of the connectors

Standard resistance (Fig. 3)

If the results match the examples above, an open circuit exists between terminal 1 of connector B2 and terminal 1 of connector C.

(c) Check the voltage.

Check the voltage
Check the voltage

(1) In a circuit in which voltage is applied to the ECU connector terminal, an open circuit can be checked by conducting a voltage check.

With each connector still connected, measure the voltage between the body ground and these terminals (in this order): 1) terminal 1 of connector A, 2) terminal 1 of connector B, and 3) terminal 1 of connector C.

Standard voltage (Fig. 4)

If the results match the examples above, an open circuit exists in the wire harness between terminal 1 of connector B and terminal 1 of connector C.

Basic inspection
(a) WHEN MEASURING RESISTANCE OF ELECTRONIC PARTS (1) Unless otherwise stated, all resistance measurements should be made at an ambient temperature of 20°C (68°F). Resistance measurements may b ...

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. ...

Other materials:

ECM Power Source Circuit
DESCRIPTION When the ignition switch is turned to the ON position, the battery voltage is applied to terminal IGSW of the ECM. The ECM MREL output signal causes a current to flow to the coil, closing the contacts of the EFI relay and supplying power to terminal +B of the ECM. If the igniti ...

How to proceed with troubleshooting
HINT: The intelligent tester can be used in steps 2, 3, 4, 6 and 9. 1 VEHICLE BROUGHT TO WORKSHOP 2 CONNECT INTELLIGENT TESTER TO DLC3 HINT: If the display indicates a communication fault in the tester, inspect the DLC3. 3 CHECK DTC AND FREEZE FRAME DATA (a) Check for DTC(s) and freeze f ...

Adjustment
CAUTION:  Do not stare at the luminous portion of the laser during adjustment. The intensity of the laser light is low, but it may result in loss of sight.  If operation is not carried out as specified, there may be a risk that you are exposed to hazardous radiation. HINT: ...

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