The throttle position sensor (TPS) is a critical component of your 6.7 Cummins engine’s efficiency and performance. TPS difficulties, like those with any component, can arise over time and result in issues including inconsistent idle, a lack of power, gearbox shifting issues, fuel efficiency issues, and engine misfires. Fortunately, you can get your Cummins engine back to peak performance by spotting these TPS issues early and applying the right fixes. In this post, we’ll examine typical throttle position sensor Problems involving the 6.7 Cummins engine and offer workable fixes to successfully solve them, assuring smooth running and extending the lifespan of your car.
6.7 Cummins Throttle Position Sensor Problems
A defective sensor, low circuit issues, and other issues are some of the Cummins throttle issues. We’ll start with a table and briefly discuss the most frequent issues with the Cummins throttle sensor as well as their causes. The table will be followed by an in-depth explanation of the symptoms and fixes.
| Problem | Symptoms | Possible Causes |
| Erratic or unstable idle | – Fluctuating RPMs at idle | – Malfunctioning throttle position sensor (TPS) |
| – Stalling or rough idle | – Loose or damaged wiring connections | |
| – Engine surges or hesitates | – Faulty throttle body | |
| – Check Engine Light (CEL) illuminated | – | |
| Lack of power | – Reduced engine performance | – Failed throttle position sensor (TPS) |
| – Poor throttle response | – Clogged or dirty throttle body | |
| – Difficulty accelerating | – Intake air leaks | |
| – CEL illuminated | – | |
| Transmission shifting issues | – Delayed or erratic shifting | – Faulty throttle position sensor (TPS) |
| – Harsh or rough shifting | – Damaged wiring harness | |
| – CEL illuminated | – Transmission control module (TCM) issues | |
| – Low transmission fluid level or poor quality fluid | ||
| Fuel efficiency problems | – Decreased fuel economy | – Malfunctioning throttle position sensor (TPS) |
| – Excessive fuel consumption | – Faulty oxygen sensors | |
| – CEL illuminated | – Clogged air filter or fuel injectors | |
| – Fuel system leaks or pressure issues | ||
| Engine misfires | – Rough engine operation | – Faulty throttle position sensor (TPS) |
| – Loss of power or acceleration | – Ignition system issues (spark plugs, coils) | |
| – Hesitation or stumbling while driving | – Fuel system problems (clogged injectors, low fuel pressure) | |
| – CEL illuminated | – |
Sensor Starts Overflowing
Check your throttle position sensor thoroughly when the engine begins to hesitate and it starts to overflow. In such situations, the only choice is to replace it with a new one because it may wear out or become damaged.
Harsh Idle Either Gets Too Low or Too High
The throttle position switch can malfunction occasionally. As a result, it either rises excessively or stays surprisingly low or inactive.
If your throttle switch has problems, you should either get it repaired by a professional or have it replaced.
The Engine Keeps Stalling
Similarly, your engine will continue to stall if the throttle position switch becomes loose. This is due to a voltage drop caused by a carelessly positioned throttle switch. It falls below the typical voltage level. As a result, the engine continues to stall.
In such circumstances, you must examine both the switch and its connection. Replace the switch if it develops a malfunction. Unplug and re-plug the connection if it appears to be loose. Make sure the plug is firmly in place.
The Slightest Acceleration
You can also observe that accelerating becomes more difficult. Thus, it doesn’t really accelerate smoothly. Loose connections may be the cause of this.
To make sure the wiring and connections are tight and secure, you must thoroughly inspect them. You must replace these wires as soon as possible if any of them get frayed, bent, or suffer any other damage.
Uneven Acceleration
Another sensor issue is abrupt or rough acceleration. And the PCM (Powertrain Control Module) that causes this is malfunctioning.
The engine accelerates unevenly due to a damaged PCM. As a result, you must swap out the damaged PCM for a new one.
Engine Roughly Starts
A short circuit will make it tougher to start the engine. Due to the electrical sensor short circuit, the pedal position loses the necessary voltage (Accelerator Pedal Position Sensor APPS).
You need to either fix it or look for a replacement in order to avoid this issue.
Engine is Still at Idle
Even if you press the accelerator to start the engine, it won’t move. This is the result of a bad app. When you switch out the APPS for a new one, this issue will disappear right away.
A lot of AC noise
Extreme AC noises are another typical sensor issue that can be quite bothersome. This occurs when the voltage of the APPS (Accelerator Pedal Position Sensor) is impacted by the alternator. As a result, the torque converter repeatedly locks and unlocks.
In some situations, the rebuild itself may have a problem, and you will need to replace it.
Frequently Asked Questions:
What controls the throttle on a 6.7 Cummins?
The throttle control valve, which has a butterfly valve that has been known to become clogged with soot and freeze up, is situated between the intake manifold and intercooler pipe on the driver’s side of the engine.
How do I test my Cummins TPS?
To test the throttle position sensor (TPS) on a Cummins engine, you can follow these general steps:
- Preparation:
- Ensure the engine is off and the key is removed from the ignition.
- Locate the TPS on the throttle body. It is typically mounted on the side or top of the throttle body.
- Visual Inspection:
- Inspect the TPS for any signs of physical damage or loose connections. Make sure the wiring harness is securely connected.
- Resistance Test:
- Use a digital multimeter set to the resistance (ohms) setting.
- Disconnect the electrical connector from the TPS.
- Connect the multimeter probes to the corresponding TPS terminals (refer to a repair manual or wiring diagram for the correct pinout).
- Gradually move the throttle plate while observing the resistance readings on the multimeter.
- The resistance values should change smoothly and without any sudden jumps. Refer to the manufacturer’s specifications for the expected resistance values at various throttle positions.
- Voltage Test (Optional):
- If your multimeter has a voltage setting, you can perform a voltage test on the TPS.
- Reconnect the electrical connector to the TPS.
- Set the multimeter to the voltage (DC) setting.
- Connect the positive probe to the TPS signal wire and the negative probe to a good ground.
- Turn the ignition key to the “On” position without starting the engine.
- Slowly open and close the throttle while observing the voltage readings on the multimeter.
- The voltage should increase or decrease smoothly and without any sudden spikes. Again, refer to the manufacturer’s specifications for the expected voltage values at various throttle positions.
- Interpretation of Results:
- If the resistance or voltage readings are erratic, inconsistent, or do not align with the manufacturer’s specifications, it indicates a faulty TPS that should be replaced.
- If the TPS passes the resistance and voltage tests but you still suspect a problem, consult a qualified mechanic or refer to the specific diagnostic codes for further troubleshooting.
Which component controls throttle valve position?
An engine’s air intake is tracked by a sensor called a throttle position sensor (TPS). In order to directly monitor the throttle position, the sensor is typically mounted on the butterfly spindle or shaft.
Where is 6.7 Cummins electronic throttle Valve location?
The throttle valve on a 6.7 Cummins engine is located in the intake horn between the intercooler and the engine on the driver’s side. This information is confirmed by a user in a Dodge Diesel forum, where they discuss the basic setup and mention that for basic deletes, the throttle valve does not have to be removed. The throttle valve, also known as the “butterfly valve,” is part of the air intake system and can be a point of interest for those looking to perform modifications such as a throttle valve delete for increased air flow.
How to Reset 6.7 cummins service electronic throttle control?
To reset the electronic throttle control (ETC) on a 6.7 Cummins engine, you can follow these steps:
- Ensure the engine is turned off and the key is removed from the ignition.
- Locate the battery in the vehicle. It is typically found in the engine compartment.
- Disconnect the negative terminal (black cable) from the battery. This will temporarily interrupt the power supply to the ETC system.
- Wait for approximately 15 minutes. This allows the ETC system to completely discharge and reset.
- While waiting, you can also step on the brake pedal a few times or press the horn button to discharge any residual electrical energy.
- After the waiting period, reconnect the negative terminal to the battery.
- Start the engine and let it idle for a few minutes. Allow the engine to warm up and stabilize.
- During this time, avoid any sudden or aggressive throttle inputs. Gradually and smoothly press the accelerator pedal to increase the engine speed.
- Observe the engine’s response and check if the ETC system is functioning properly. Ensure that there are no warning lights or abnormal symptoms.
About The Author
Ibrar Ayyub
I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.
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