Date registered: Mar 2011
Vehicle: 2001 C240, 1984 300D
Mentioned: 1 Post(s)
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ESP Error - C1142
Well, I finally built a system for reading diagnostic codes to track down my intermittent ESP errors. I cleared a bunch of old, stored codes which I don't think were helpful and drove until the error came back.
Scanned and got C1142 - Lateral acceleration sensor or micro mechanical turn rate and steering angle sensor. Open circuit, short circuit, voltage supply, plausibility. Verify tension at lateral acceleration sensor - ignition on 4.75 - 5.25 volts.
I cleaned the contacts on the sensor connector and tried again - same result.
With the car parked in the garage the ESP live data shows a good steering angle but the lateral acceleration shows about -140m/s2 while sitting still. Unfortunately I'm using a desktop system in my garage so I can't actually drive and capture more results.
From this I think it's safe to say I need a new lateral acceleration sensor.
But how does one check the voltage on that? Do you just pull the harness and measure between the pins? Which pins should have 5 volts? Or does sensor need to be connected with something special so you can measure the voltage while the connector is on the sensor?