Description
OBD-II Trouble Code Description for P0121 Aston Martin
Throttle/Pedal Position Sensor/Switch “A” Circuit Range/Performance
What does this mean?
OBD2 Code P0121 Aston Martin definition:
The Throttle position sensor is a potentiometer that measures the amount of throttle opening. As the throttle is opened, the reading (measured in volts) goes up. The powertrain control module (PCM) supplies a 5 Volt reference signal to the throttle position sensor (TPS) and usually a ground also. A general measurement is: at idle = .5 Volts; full throttle = 4.5 Volts. If the PCM detects that the throttle angle is greater or less than it should be for a specific RPM, it will set this code.
Symptoms
Possible sumptoms of OBD code P0121 Aston Martin
Symptoms of a P0121 Aston Martin trouble code could include: Malfunction Indicator Lamp (MIL) illumination (Check Engine Light or Service Engine Soon light) Intermittent stumble on acceleration or deceleration Blows black smoke on acceleration No start
Causes
Possible causes of OBD code P0121 Aston Martin
A code P0121 Aston Martin may mean that one or more of the following has happened: TPS has intermittent open or short internally Harness is rubbing and causing an open or short in the wiring Bad connection at the TPS Bad PCM (less likely) Water or corrosion in connector or sensor
Possible Solutions
1. If you have access to a scan tool, see what the idle and WOT (wide open throttle) readings are for the TPS. Check if they’re close to the specifications mentioned above. If not, then replace the TPS and re-check. 2. Check for an intermittent open or short in the TPS signal. To do that, you can’t use a scan tool. You’ll need an oscilliscope. The reason is because scan tools take samplings of many different readings over just one or two data lines and can miss an intermittent drop out. Hook up your oscilliscope and watch the signal. It should sweep up and down smoothly with no drop outs or spikes. 3. If no problems were noticed, perform a wiggle test. Do this by wiggling the connector and harness while watching the pattern. Does it drop out? If so, replace TPS and re-check. 4. If you have no TPS signal, check for 5 Volt reference at the connector. If it’s present, check the ground circuit for open or shorts. 5. Make sure the signal circuit isn’t 12V. It should never have battery voltage. If it does, trace circuit for short to voltage and repair. 6. Look for any water in the connector and replace TPS as necessary.
The OBD2 Code Information Be Applicable For Aston Martin:
2014 Aston Martin Vanquish Volante,2014 Aston Martin V12 Vantage S,2014 Aston Martin Rapide S,2013 Aston Martin Vantage SP10,2013 Aston Martin Vanquish Q,2013 Aston Martin Vanquish Centenary Edition,2013 Aston Martin V12 Zagato,2013 Aston Martin V12 Vantage Roadster,2013 Aston Martin DB9,2013 Aston Martin CC100 Speedster Concept,2013 Aston Martin AM 310 Vanquish,2012 Aston Martin Virage Volante,2012 Aston Martin Virage,2012 Aston Martin Vantage GT3,2012 Aston Martin V8 Vantage S Roadster,2012 Aston Martin V8 Vantage S,2012 Aston Martin V8 Vantage,2012 Aston Martin Cygnet,2011 Aston Martin Vantage GT4,2011 Aston Martin V8 Vantage N420 Roadster,2011 Aston Martin V8 Vantage N420,2011 Aston Martin V12 Zagato Racecar,2011 Aston Martin V12 Zagato Concept,2011 Aston Martin DBS Carbon Edition,2011 Aston Martin DB9,2010 Aston Martin V12 Vantage,2010 Aston Martin Rapide,2010 Aston Martin One-77,2010 Aston Martin DBS Volante,2009 Aston Martin Vantage GT4,2009 Aston Martin V8 Vantage Roadster,2009 Aston Martin V8 Vantage,2009 Aston Martin Lagonda Concept,2009 Aston Martin DB9 Volante,2009 Aston Martin DB9,2009 Aston Martin Cygnet Concept,2008 Aston Martin V8 Vantage N400,2008 Aston Martin DBS Racing Green,2008 Aston Martin DBS Lightning Silver,2008 Aston Martin DBS Infa Red,2008 Aston Martin DBS,2008 Aston Martin DB9 LM,2007 Aston Martin V8 Vantage Roadster,2007 Aston Martin V8 Vantage N24,2007 Aston Martin V8 Vantage,2007 Aston Martin V12 Vantage RS Concept,2007 Aston Martin DBS,2007 Aston Martin DB9 Volante,2007 Aston Martin DB9,2006 Aston Martin Rapide Concept,2006 Aston Martin DBRS9,2005 Aston Martin V8 Vantage,2005 Aston Martin DBR9,2004 Aston Martin Zagato Vanquish Roadster Concept,2004 Aston Martin Vanquish S V12,2004 Aston Martin DBR9 Prototype,2004 Aston Martin DB9 Volante,2004 Aston Martin DB9,2003 Aston Martin DB AR1,2003 Aston Martin DB7 GT,2003 Aston Martin AMV8 Concept Car,2002 Aston Martin DB7 Vantage Zagato
Note:
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