Rick's Free Auto Repair Advice

ABS light on – C1145, C1234

ABS light on – C1145, C1234

If you own a 2003 Mercury Mountaineer 4.0L, FLEX, Vin K and have Anti-lock Brake System (ABS) light on and trouble codes C1145 or C1234, you may have a bad connection at the wheel speed sensor. Start by inspecting the Right Front (RF) wheel speed sensor connections for physical
damage. Look for a corroded connection or broken wire. If the sensor shows any signs of physical damage, check the wheel hub and tone ring. Replace the wheel hub or tone ring assembly as needed.

Next, disconnect the sensor connector and measure the voltage between the Yellow/Black (YE/BK) wire and the Yellow/Red (YE/RD) wire with the ignition switch in the RUN position. You should see voltage greater than 9.0 volts.

If the voltage is lower than that, check the individual circuits for a possible open circuit, short to ground, or short to each other. Do those checks before suspecting a bad ABS module.

If the voltage checks out. replace the sensor. Then clear the codes and drive the vehicle. Recheck to see if the codes set again.

For more information on this repair or any others for your vehicle, buy an online subscription to either Alldatadiy.com or eautorepair.net. Click on this link to compare the two services: Compare Alldata and Eautorepair.

You need a professional shop manual to work on a late model vehicle. And you need access to the latest technical service bulletins so you don’t waste time and money replacing parts that may misbehave due to a manufacturer’s software glitch. Forget about those cheap manuals you find at the auto parts store. They will just lead you astray. Here are the two best online shop manuals around.

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Get a 1-Month subscription (31 Days) for $16.99, 1-Year (Best Value!) for $25.99, or a    4-Year (Best Value!) for $39.99. I like the wiring diagrams in Eautorepair.net better than the hard-to-read factory diagrams on Alldatadiy. However, Eautorepair.net doesn’t show how to remove trim or door panels. Alldata does.

AlldataDIY.com is simply Alldata with a consumer style interface. They have a different pricing model. But a 1-year subscription for $26.95. Add additional vehicles for $16.95 for a year. Or, buy their 5-year subscription for $44.95. Add additional vehicles for $29.95 for five years.

© 2012 Rick Muscoplat

Posted on by Rick Muscoplat

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