Question about Cars & Trucks
Throwing code 21 12, TPS failed low. Idle is 750rpm at idle. Some times it will not shift into D or R when key pad is pushed.
If you look at the throttle body it will be attached to the end of the butterfly shaft 2 screws hold it to the t/body
Posted on Apr 05, 2015
Varify that the sensor is bad before replacing. It may just need adjusting or, the problem may lay in wiring and not on the sensor. A replacement sensor would need to be calibrated or adjusted for your application needs
Posted on Apr 05, 2015
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Posted on Jan 02, 2017
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May 18, 2012 | 2004 Chrysler Sebring
Cherokee, Grand Cherokee, 1999-2005
Throttle Position Sensor
The 3 wire Throttle Position Sensor (TPS) is mounted on the throttle body and is connected to the throttle blade.
The TPS is a 3wire variable resistor that provides the Powertrain Control Module (PCM) with an input signal (voltage) that represents the throttle blade position of the throttle body. The sensor is connected to the throttle blade shaft. As the position of the throttle blade changes, the resistance (output voltage) of the TPS changes.
The PCM supplies approximately 5 volts to the TPS. The TPS output voltage (input signal to the PCM) represents the throttle blade position. The PCM receives an input signal voltage from the TPS. This will vary in an approximate range of from .26 volts at minimum throttle opening (idle), to 4.49 volts at wide-open throttle. Along with inputs from other sensors, the PCM uses the TPS input to determine current engine operating conditions. In response to engine operating conditions, the PCM will adjust fuel injector pulse width and ignition timing.
The PCM needs to identify the actions and position of the throttle blade at all times. This information is needed to assist in performing the following calculations:
Ignition timing advance Fuel injection pulse-width Idle (learned value or minimum TPS) Off-idle (0.06 volt) Wide Open Throttle (WOT) open loop (2.608 volts above learned idle voltage) Deceleration fuel lean out Fuel cutoff during cranking at WOT (2.608 volts above learned idle voltage) A/C WOT cutoff (certain automatic transmissions only)
Removal & Installation
3.7L & 4.0L
Dec 31, 2011 | 2001 Jeep Grand Cherokee
1) Maladjusted TPS
2) Defective TPS
3) No +5 volt reference to TPS
4) TPS-return to ECM is shorted to ground or to sensor ground
5) Defective ECM
Good luck, i hope this helps.
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