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Old 11-17-2020, 06:21 PM   #1
soccercoach
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Join Date: Nov 2020
Location: California
Posts: 9

2004 L-Series 3.0L Sedan
Default ABS Light

I solved this one and am offering the details hoping it will help others.

ABS light on and traction control disabled.
Clearly an ABS problem, but where. Standard advice says read the diagnostic codes, but my Actron CP9680 does not see the ABS system, (despite being to read the ABS module on a 1999 Cadillac and other newer cars).

Guessing it was a wheel sensor, checked each sensor at the wheel by unplugging the connector and measuring with an ohmmeter. The fronts are harder to reach and required removing the wheel. Also, if the sensor is good, a volt meter on the AC range should see a signal with a solid spin of the wheel. Here is my data:

Passenger front 1580 ohms, ~ 200 mV
Passenger rear 1080 ohms, ~ 200 mV
Driver rear open ohms, 0 mV
Skipped Driver front since I found one problem and fronts are harder to check.

Replacement of rear ABS sensors requires a wheel bearing and hub assembly, while the fronts can replace just the sensor.
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