Toyota Sienna Service Manual: Check for short circuit

Toyota Sienna Service Manual / Introduction / How to troubleshoot ecu controlled systems / Electronic circuit inspection procedure / Check for short circuit

If the wire harness is ground shorted, locate the section by conducting a resistance check with the body ground (below).

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

Check the resistance with the body ground

(b) Check the resistance with the body ground.

(1) Disconnect connectors A and C and measure the resistance.

Standard resistance (Fig. 6)

HINT:

Measure the resistance while lightly shaking the wire harness vertically and horizontally. If your 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.

Disconnect connector B and measure the resistance

Standard resistance (Fig. 7)

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

Check for open circuit

(a) For an open circuit in the wire harness in Fig. 1, the resistance or voltage, as described below. (b) Check the resistance. Check the resistance Standard resistance (Fig. 2) ...

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 s ...

Other materials:

On-vehicle inspection
1. CHECK ACCELERATOR PEDAL ROD Check the voltage. Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position. Turn the intelligent tester on. Select the menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / ACCEL POS ...

Removal
1. REMOVE REAR BUMPER COVER Put protective tape under the quarter panel. Partially the fender liner. HINT: Do not remove the fender liner completely but partially so that the bumper cover can be removed. Remove the 2 screws and 8 clips. Using a screwdriver, disengage the claws an ...

How to proceed with troubleshooting
The intelligent tester can be used in steps 4, 6, 8 and 9. 1 VEHICLE BROUGHT TO WORKSHOP 2 CUSTOMER PROBLEM ANALYSIS 3 PASSENGER AIRBAG ON/OFF INDICATOR CHECK 4 DTCs CHECK (Present and Past DTCs) Check for DTCs. Result GO TO PROBLEM SYMPTOMS TABLE 5 DTCs CHART 6 CIRCUIT ...