Toyota Corolla Repair Manual: Check short circuit

Toyota Corolla Repair Manual / Introduction / How to troubleshoot ecu controlled systems / Electronic circuit inspection procedure / Check short circuit

If the wire harness is ground shorted as shown in fig. 5, Locate the section by conducting a resistance check with the body ground in step (b).

Check the resistance with the body ground.

Disconnect connectors a and c and measure the resistance between terminals 1 and 2 of connector a and the body ground.

Resistance: 10 kΩ or higher

Hint

: measure the resistance while lightly shaking the wire harness vertically and horizontally. In the case of fig. 6: Between terminal 1 of connector a and body ground " below 1 Ω

between terminal 2 of connector a and body ground " 10 kΩ

or higher therefore, the cause is a short circuit between terminal 1 of connector a and terminal 1 of connector c.

Disconnect connector b and measure the resistance between terminal 1 of connector a and the body ground, and terminal 1 of connector b2 and the body ground.
In the case of fig. 7: Between terminal 1 of connector a and body ground " 10 kw or higher between terminal 1 of connector b2 and body ground " below 1 w therefore, the cause is a short circuit between terminal 1 of connector b2 and terminal 1 of connector c.

Check and replace ecu

Check open circuit

For the open circuit in the wire harness in fig. 1, Perform a resistance check in step (b) or a voltage check in step (c) to locate the section. Check the resistance. Disc ...

Check and replace ecu

Notice: start an inspection of the connector from the backside of the connector on the wire harness side with the connector connected to the ecu. When no measurement condition is specified, perf ...

Other materials:

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