APPS.... Accelerator Pedal Position Sensor. Its the same thingas a TPS, throttle positioning sensor.
Will a cab from a 1998 dodge diesel 250 fit a 2004 dodge diesel 250?
Jul 13, 2016 Edit March 24 2019 This is an early 2004 305/555 dodge diesel with the 6 speed. Throttle Position Sensor is located under the battery box on the drivers side. Jun 14, 2019 My rig: 01 Dodge Ram 2500 4x4 that I built. Mods: 8in Top gun customz long arm hit with 6in atlas springs in the rear, full bilsteins, 37s, fully built transmission with sun coast parts, full auto meter colbalt gauges, fuel pressure, over all boost, bottom turbo boost, tranny temp, egts, 4.10s, custom 3.5in intake horn, grid heater delete, II super dragon flow 11 hole injectors, Tst power max.
Where is the EGR valve on a 2004 dodge ram diesel?
How do you change the parking brake pads on a 2004 dodge 3500?
how do you chage bracke pads on a 355 2004 dodge diesel truck Read More
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A 2004 Dodge Ram with the 5.9L Cummin's does not have EGR. Read More
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The Cummins Diesel engine does not have spark plugs. Read More
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One. Located near the back of the engine on the drivers side. Read More
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you will need to swap the output shaft and tail housing from the old 4x4 transmission to the 2wd tranny which requires complete disassemble and then reassemble of the transmission Read More
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its a early 48re. It has a cable, but no tva motor on the side. Read More
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Answer Yes if you have the moter mounts from the 2001 moter. Read More
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The auto is a 48RE The manual is a NV5600 Read More
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Inside the ECM, lower driver side if the block. Read More
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the high output is 315 hp the others are 305 hp Read More
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Front driver side of the crankshaft pulley. Read More
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Trouble code P0301 means: Cylinder 1 Misfire Detected Read More
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The automatic is a 48 RE. The manual is a NV5600. Read More
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The bushing on the track bar. http://lukeslink.com/ this link has the fix. Read More
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It is on the front driver side, under the black screw cap. Read More
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You can remove the old serpentine belt on your 2004 Dodge Ram by loosening the tensioner pulley. Put the new serpentine belt on and tighten it with the tensioner pulley. Read More
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i been searching for it on my 2004 and cant find it either. Read More
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The location of the fuel filter on a 2004 Dodge ram diesel?
Driver side of the block. In the can behind and below the air intake elbow. Read More
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P0483 radiator fan speed incorrect. You need to replace the fan clutch. Read More
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One screen in the tank (not servicable) , and one filter on the driver side of the block. Read More
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http://www.thedieselgarage.com/forums/showthread.php?t=52035 Read More
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on the fuel filter ,dumb but there unless it has had the dealer retrofit kit installed, then it would be inthe tank. Read More
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Gas engine : it is part of the fuel pump module in the tank. Diesel : it is on the driver side of the block. Read More
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check the power steering rack or the steering pump Read More
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Too much oil in the pan. Broken piston rings. Bad turbo bearing seals. Read More
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P2121 code definition
The powertrain control module (PCM) or another related control module has detected a problem in a particular throttle position sensor circuit. Related modules can include:
- Transmission control module
- Body control module
- Antilock brake control module
- Instrument panel control module
- Fuel injection control module
- Turbo control module
- Anti-theft module
- Cruise control module
- Traction control module
- Proximity alert module
- Climate control module
What the P2121 code means
If the throttle actuator control motor circuit sends a reading to the PCM that is out of normal specs, a trouble code will be stored and the malfunction indicator lamp (MIL) will illuminate. Some models may require several drive cycles with the failure to illuminate the MIL, while others will activate it immediately.
What causes the P2121 code?
- Defective throttle actuator control motor
- Defective throttle position actuator
- Defective throttle position sensor or pedal position sensor
- Corroded, open or shorted wiring or connectors in throttle actuator motor or Controller Area Network (CAN) bus harness
- Loose control module ground strap
- Broken ground wire
What are the symptoms of the P2121 code?
- Poor acceleration
- Forced shutdown
- Forced idle
How does a mechanic diagnose the P2121 code?
An OBD-II scanner/code reader, digital volt/ohmmeter (DVOM), oscilloscope and manufacturer’s service manual will be necessary for this diagnosis and repair. NOTE: P2121 codes only apply to vehicles with an electronically controlled “drive by wire” throttle body. These are designed with a sensor on the accelerator pedal arm which sends a voltage signal to the PCM or other related controller. This is what commands the throttle body to open or close, depending on conditions.The PCM enables the throttle actuator motor in the required direction by changing voltage and polarity. As the throttle actuator turns, it turns a gear which meshes with a larger gear, allowing the throttle plate to open quickly and suddenly or slowly, depending on the driver input.
- Begin with a visual inspection of all wiring and connectors.
- Repair/replace any damaged, disconnected, shorted or corroded wiring, connectors and components as needed. Retest the system after repairs are completed.
- If all system wiring, connectors and components are in good condition, connect the scanner/code reader to the diagnostic connector. Record any stored codes and freeze frame the data. Clear the codes and test drive the vehicle to see if codes return. Remember that on some vehicles, multiple drive cycles may be needed for the MIL to illuminate.
- Test the throttle position sensor electrical connector by disconnecting it from the sensor. Use the DVOM to test for voltage and ground signals. A 5-volt reference signal and a battery ground should be available. The manufacturer’s service manual will show exact wiring diagrams and connector views.
- If no reference voltage and/or ground are found, disconnect the connector at the PCM. Test the any related controller connectors for resistance and continuity. Repair/replace shorted/open circuits as needed.
- Clear codes and test drive the vehicle.
- If voltage/ground signals are present at the connector for the throttle actuator motor, replace the motor, clear codes and drive the vehicle.
- In many cases, the entire throttle body will need to be replaced, including the actuator motor and throttle position sensor.
- Pedal sensor replacement may also be necessary with throttle body replacement.
- If voltage/ground signals are within manufacturer’s specs, use the oscilloscope to monitor pedal sensor operation, looking for abnormal spikes in voltage or other glitches.
Common mistakes when diagnosing the P2121 code
Often, technicians treat symptoms rather than the cause of a problem when multiple codes are registered. Codes related to lean exhaust, engine misfires, fuel injectors or numerous other codes can be easy to misdiagnosis when accompanied by a controller communication code. Remember to diagnose the codes in the order in which they were stored, to help your chances for a proper diagnosis and repair. Using the scanner’s freeze frame function can help determine the order in which codes were stored.
How serious is the P2121 code?
A P2121 code can result in symptoms that make the vehicle undrivable.
What repairs can fix the P2121 code?
- Throttle actuator motor replacement
Additional comments for consideration regarding the P2121 code
On post-2008 vehicles, a code such as P2121 may be traced to the CAN bus. The CAN bus is a conglomeration of sensors, wiring harnesses and connectors that enables information to be shared between modules, and it controls almost every electrical function of the vehicle. A technician with a specialized scanner such as Autohex or Tech II can determine CAN-related issues, but it may be something that’s very difficult to diagnose and repair for a non-professional mechanic. Probing each individual circuit, out of hundreds, could result in hours and hours of labor.
Proper service of CAN networks requires a hard drive to retain memory in case of a complete system meltdown; all it can take is one misplaced DVOM probe to cause a catastrophe. A professional technician with a specialized CAN scanner, on the other hand, can determine pin values and control module operation without the risk of a system meltdown.Keep an eye open for engine or transmission ground cables, straps or wires; sometimes these are left dangling after recent repairs.
In many cases, problems like a P2121 are simply beyond the expertise of a non-professional mechanic and should be left to a qualified technician. Sophisticated CAN systems are designed for service by factory-trained technicians and not non-professionals.
Need help with a P2121 code?
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