Question about Mercedes-Benz CLK-Class
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A variable three-wire resistor-type electrical sensor which sends a signal to the electronic control unit relative to the throttle position.
Different kinds of problems can happen with a throttle position sensor (TPS).
The TPS can be checked with either a voltmeter or an ohmmeter.
A throttle position sensor can be checked with an ohmmeter or a voltmeter. The elongated slots in this TPS allow for adjustment. Courtesy of Ford Motor Company. To perform ohmmeter tests, the switch must be disconnected. That makes the voltmeter (or scope, which is actually a voltmeter, too) the tester of choice.
Three tests are made for TPS operation.
A glitch in a DSO pattern on a TPS test. Courtesy of Edge Diagnostic Systems. When checking voltage output of a TPS, typically there would be less than 0.1 V at idle. Typical voltage at half throttle would be 2.5 V.
NOTE Remember, there is a 5-volt reference signal. That is why there is a 2.5 V signal when the throttle is half open. At WOT the signal would be 4.5 V. Voltmeter Testing
A sensor can be tested with a voltmeter while its electrical wiring is still connected (this is called backprobing a connector). Move the throttle slowly from closed to open. At different throttle openings, varying resistances are specified. Watch for any glitches.
With the wiring disconnected, the TPS can be tested with an ohmmeter.
A normal TP sensor waveform while it opens and closes.
The waveform of a defective TP sensor. Notice the glitch while the throttle opens. These glitches are an indication of an open or short in the sensor. On some carbureted engines, an open in the TP sensor will show up as an upward spike. This is because the computer supplies a 5-volt signal to the sensor's output wire if the TP sensor has an open.
Some throttle position sensors are adjustable. Follow manufacturer's instructions.
A TP Sensor with elongated slots for sensor adjustments. Courtesy of General Motors Corporation - Chevrolet Motor Division.
To remove the switch, these might need to be drilled or filed off. After the new switch is installed and adjusted, the new mounting screws are restaked.
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Posted on Oct 09, 2009
Trouble code P0221 means Throttle/Petal Position Sensor/Switch B Circuit Range/Performance Problem. You can only check the wiring of the throttle wires. And, if the wires are connected fine then you have to replace the Throttle position sensor, which needs to be programmed by the dealer using the tools. See this link for necessary info.--
Mercedes Troublecode PO221
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Posted on Oct 08, 2009
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