Technical information

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Technician Guidelines for Antilock Braking Systems

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CHART 2: SAMPLE ABS MODULATOR VALVE PROBLEM FLOW CHART

After the problem is corrected with the known good

component, reconnect the suspect component to make sure

the problem returns. Temporarily connecting a known good

component, and then reconnecting the suspect component,

will help reduce replacement of incorrect components. If

reconnecting the suspect component does not cause the

problem to recur, thoroughly inspect the connectors and

harnessing for the cause of the problem. Reconnect the suspect

component and move (jiggle) the harness while monitoring for

the problem to return. If the problem returns with the

connection of the suspect component, permanently install the

new component.

Chart 2 represents a typical troubleshooting flow chart for a common ABS modulator valve problem.