Land Rover P0121 Throttle Position Sensor 1 Performance

Description

OBD-II Trouble Code Description for P0121 Land Rover

Throttle/Pedal Position Sensor/Switch “A” Circuit Range/Performance

What does this mean?

OBD2 Code P0121 Land Rover 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 Land Rover
Symptoms of a P0121 Land Rover 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 Land Rover
A code P0121 Land Rover 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.

Related Codes

P0120 Land Rover P0122 Land Rover P0123 Land Rover P0124 Land Rover


The OBD2 Code Information Be Applicable For Land Rover:

2013 Land Rover,2012 Land Rover,2011 Land Rover,2010 Land Rover,2009 Land Rover ,2008 Land Rover,2007 Land Rover,2006 Land Rover,2005 Land Rover,2004 Land Rover,2003 Land Rover,2002 Land Rover

 

Note:

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