Rough Running Idle, Erratic Speedometer Operation, ABS Light Illuminated, Check Engine Light, and Automatic Transmission Shifting Problems on Mazda B2500

Water intrusion into a connector (X309) located under the cab, beneath the driver's seat, can cause a rough idle, erratic speedometer operation, ABS Light and Check Engine Light illumination, and automatic transmission shifting problems. If needed, connector repair parts are available from Mazda dealers, and possibly some Ford dealers.

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Average mileage: 100,400 (43,000–150,000)
4 model years affected: 1998, 1999, 2000, 2001
10 people reported this problem
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problem details
2000 Mazda B2500 150,000 mi,
This describes the exact problem with my truck.
Problem was pickup ABS lights came on, speedometer stopped working, only shift to 1st gear & reverse. Sent my B 2500 to local Mazda found rear ABS sensor defective. Told common problem for this vehicle for years 1999 thru 2001 inexpensive fix.
1999 Mazda B2500 60,000 mi,
Engine Service light came on, speedometer stopped working, idle low
2000 Mazda B2500 43,000 mi,
Sometimes when starting it will backfire A little and the idle is extremely ruff. Turn off engine, wait 1 minute and then seems to be okay. Happens about every 4 months. Also,engine cooling indicator will not move until engine is heated up.
Replaced the TPS and still having these problems. Hope replacing this connector does the trick, these problems caused my recent smog to abort....