Toyota Tacoma manuals

Toyota Corolla Repair Manual: Check open circuit

  1. 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.

  1. Check the resistance.
  1.  Disconnect connectors a and c and measure the resistance between them.

    Resistance: 1 Ω or less

Hint

: measure the resistance while lightly shaking the wire harness vertically and horizontally. In the case of fig. 2: Between terminal 1 of connector a and terminal 1 of connector c " 10 kΩ

or higher between terminal 2 of connector a and terminal 2 of connector c " below 1 Ω

therefore, the cause is an open circuit between terminal 1 of connector a and terminal 1 of connector c.

  1. Disconnect connector b and measure the resistance between the connectors.

    In the case of fig. 3: Between terminal 1 of connector a and terminal 1 of connector b1 " below 1 w between terminal 1 of connector b2 and terminal 1 of connector c " 10 kw therefore, the cause is an open circuit between terminal 1 of connector b2 and terminal 1 of connector c.

  1. 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.

    As shown in fig. 4, With each connector still connected, measure the voltage between the body ground and terminal 1 of connector a at the ecu 5 v output terminal, terminal 1 of connector b, and terminal 1 of connector c, in that order.

  2.  If the results are: 5 v: between terminal 1 of connector a and body ground 5 v: between terminal 1 of connector b and body ground 0 v: between terminal 1 of connector c and body ground therefore, the cause is an open circuit in the wire harness between terminal 1 of connector b and terminal 1 of connector c.

Check short circuit

Basic inspection
Resistance measuring condition of electronic parts  unless stated, all resistance is measured at an ambient temperature of 20 c (68 F). As the resistance may be outside the specifi ...

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 grou ...

Other materials:

Displays and control elements
In the vicinity of the steering wheel Light switch element Turn signal indicator, high beams Instrument cluster Wipers Start/Stop button Indicator/warning lights Instrument cluster The indicator/warning lights can light up in a variety of combinations and colors. Several of the lights are c ...

Turn signal lever
Operating instructions 1 Right turn 2 Lane change to the right (move the lever partway and release it) The right hand signals will flash 3 times. 3 Lane change to the left (move the lever partway and release it) The left hand signals will flash 3 times. 4 Left turn ■Turn signals can b ...

Overhaul
1. Remove speedometer drive (mtm) gear Remove the speedometer drive (mtm) gear from the front differential case. 2. Remove front differential ring gear Place matchmarks on the front differential ring gear and front differential case. Remove the 8 bolts. Using a hamme ...

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