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Old 10-18-2018, 01:57 PM   #7
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,140
 

2003 L-Series 3.0L Sedan
Default Re: abs lessons to learn

Quote:
The normal sequence for ABS system self checks occurs from ignition ON time when the ABS light cycled on and off to inform the driver that initial ABS self tests (electronics) have passed otherwise the ABS light will remain ON. When driving off, ABS initializes itself by monitoring wheel speed sensors and activating its motor to continue self tests and if all goes well all you hear is a momentary 'zinging' sound. Zinging occurs around 5-10 mph. ABS always starts from all its valves closed whether or not failure occurred (ABS light staying ON ) to stay invisible to the main braking system so it can never interfere with braking if it fails.
This info came from the '02 SC2 service manual. I'm quoting from another thread you replied to. I presume its backward compatible with previous abs versions. If we can presume this applies to older S-series abs brakes then the initial abs light turning on and off at ignition on time suggests the abs module is fine. When driving off and the abs light turns on, this suggests a faulty wheel speed sensor, reluctor or wiring to each wheel speed sensor.

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