Checking Wiring And Terminals: Open-Circuit
CAUTION:
Avoid touching control module connector pins and corresponding cable harness connectors. There is a risk of electrostatic discharge, which could damage the control module. Relieve any charge on yourself and the tools to be used by holding the metal part of the tool and touching part of the body just before starting work.
An open-circuit in a cable will be indicated by the loss of a function (or functions).
Chafed and broken leads are common causes of faults.
Checks:
- Disconnect the connectors at both ends of the cable.
Check the cables visually according to Inspect Terminals Visually .
Connect an ohmmeter between the ends of the cable.
The ohmmeter should read approximately 0 Ω if there is no open-circuit in the cable.
NOTE:
When taking readings from the female connector it is important to position a replacement part between the female connector and the measuring instrument. The replacement part consists of a piece of cable with a cable terminal at one end. Never insert an object into the female connector. There is a risk of damaging the female connector.
Shake the cable lightly and pull on connectors during measurement to locate the damage.
If the reading is not correct. Replace the cable and/or continue according to Contact Resistance And Oxidation .
Always check the control module and control module box connectors to ensure that their pins and sockets are not bent or damaged, this may cause faults.
Check pins and terminals particularly carefully.