How To Check Electrical Connectors
Many electrical problems are caused by faulty electrical connections or wiring. It is also possible for a sticking com-
ponent or relay to cause a problem. Before condemning a component or wiring assembly always check the electrical
connectors for good continuity.
How To Probe Connectors
• Connector damage and an intermittent connection can result from improperly probing the connector during cir-
cuit checks.
• The probe of a DMM may not correctly fit the connector cavity. To correctly probe the connector, follow the pro-
cedures below using a “T” pin. For the best contact grasp the “T” pin using an alligator clip.
Probing From Harness Side
• If the connector has a rear cover connector, remove the rear cover before probing the terminal.
• Do not probe waterproof connectors from the harness side. Damage to the seal between the wire and connec-
tor may result.
Probing From Terminal Side
• Female Terminal:
− Do not insert any object into the female connector that is bigger than the male terminal.
• Male Terminal:
− Carefully probe the contact surface of each terminal using a “T” pin. Do not bend terminal.
How To Check Proper Contact Spring Tension Of Terminal
• An enlarged contact spring of a terminal may create intermittent signals in the circuit.
• If an intermittent open circuit occurs, follow the procedure below to inspect for open wires and enlarged contact
spring of female terminal.
− Use a male terminal which matches the female terminal.
− Disconnect the suspected faulty connector and hold it terminal side up.
− While holding the wire of the male terminal, attempt to insert the male terminal into the female terminal.
− While moving the connector, check whether the male terminal can be easily inserted or not.
NOTE :
If the male terminal can be easily inserted into the female terminal, replace the female terminal.
DIAGNOSING ELECTRICAL FAILURES
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Chery Automobile Co., Ltd.
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