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For example, the ABS electronic control module (ABS ECM) relies on the supply of
accurate information to enable it to monitor and control the brake system. One dirty
terminal will cause an excessive voltage drop resulting in an incorrect signal to the ECM.
If, when carrying out fault diagnosis, a fault appears to clear by simply disconnecting and
reconnecting an electrical plug, examine each disconnected plug for the following.
Before Disconnection:
• If testing with a voltmeter, the voltage across a connector battery supply and
ground pins should be virtually battery volts with a small deviation allowable for
usual voltage drop within wiring circuits. If there is a noticeable change, suspect
faulty/dirty connections. Refer to the ABS circuit diagram within this Service
Manual for pin numbers.
When Disconnecting a Connector:
• Check for a security device that must be released before the connector can be
separated e.g. barb, hook and eye etc.
When Inspecting a Connector:
• Check that the individual pins have not been bent.
• Check for dampness/dirt/corrosion.
• Check cables for security.
• Check cable pin joints for damage.
When Connecting a Connector:
• Make sure there is no dirt around the connector/seal.
• Push together squarely to ensure terminals are not bent or incorrectly located.
• Push the two halves together positively.
Disconnection of ABS ECM Connector
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