Open Circuit Check

Possible causes for the open circuit are as follows. As the cause is in the connector or terminal in many cases, they need to be checked particularly carefully.

• Loose connection of connector
• Poor contact of terminal (due to dirt, corrosion or rust on it, poor contact tension, entry of foreign object etc.)
• Wire harness being open

When checking system circuits including an electronic control unit such as ECM, TCM, ABS control module, etc., it is important to perform careful check, starting with items which are easier to check.

1. Disconnect negative (-) cable from battery
2. Check each connector at both ends of the circuit being checked for loose connection. Also check lock condition of connector if equipped with connector lock.
   Fig 1: Checking Lock Condition

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3. Using a test male terminal, check both terminals of the circuit being checked for contact tension of its female terminal by inserting and removing just for once (1). Check each terminal visually for poor contact (possibly caused by dirt, corrosion, rust entry of foreign object, etc.). At the same time, check to make sure that each terminal is locked in the connector fully.
   Fig 2: Checking Contact Tension

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4. Using continuity check or voltage check the following procedure, check the wire harness for open circuit (2) and poor connection with its terminals. Locate abnormality, if any.

Fig 3: Locating Looseness Of Crimping

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