Question about 2003 Nissan Altima

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Engine will start and run. when depressing accelorator pedal there is no reponse. could the throttle body assembly be bad if so how do i verfiy that?

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  • part306 Feb 07, 2010

    there is no cable it is fly by wire. there is five volt referance voltage at the gas pedat ane the throttle body assembly

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  • 14 Answers

Check cable first then check the body

Posted on Feb 05, 2010

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Hi 04 kia sedona 2.9 will not start unless you use easy start then it turns of over a lot before the engine it will start. once running the engine is ok this happens hot or cold.


I would start by pulling a spark plug and seeing if it is fouled. If all plugs are good, check for a clogged air filter or improperly functioning throttle body. Remove the air intake assembly and have someone press the accelerator with the keys in the ACC position. When the accelerator is fully depressed, the throttle plate should open to almost 90 degrees, when the pedal is released, it should close very quickly. If it doesn't, your throttle body will need to be replaced.

May 12, 2016 | Kia Cars & Trucks

1 Answer

2005 Mustang GT idleing problem


may be it the problem of another throttle body.also check the ignition switch.

Check all of the battery terminals and cables and check the wires on the starter/selonoid, start from the battery and follow the cable out and check all conections , clean and tighten them and if it still does it the starter/selonoid is bad and needs replacement...

Aug 25, 2008 | 2005 Ford Mustang

1 Answer

1995 Buick LeSabre 3.8 Liter Wont start unless I push down on gas pedal like it wants more gas, Why? Runs OK when running


Possibly a bad or dirty Idle Air Control motor. The engine computer controls the operation of this motor to control idle speed. A pintle on the motor extends and retracts, according to signal from the computer. The pintle controls an air passage below it to give or take away air during idle -when the throttle shaft is closed, no air will get into the engine through the throttle body except through the idle air passage . The IAC motor or valve is on the throttle body, with a 4 wire connector. Take it off and look for carbon or coking deposits around the valve's pintle, and in the air passage beneath it. With the idle valve off, plug the connector back on it, then watch the pintle as the key is turned to on. If there is no movement whatsoever, the motor is probably bad.

I have also heard that a bad coolant temperature sensor can cause such a hard start. If the computer does not know the engine is cold, it won't put enough gas into the cylinders for easy starts. The engine needs more gas to start and run when cold.

Sep 13, 2014 | 1995 Buick LeSabre

1 Answer

Low power


First thing to do is get the computer scanned for trouble codes. The codes will point you to what needs to be tested.
Chances are its the throttle position sensor, but it could be several other things.

Jan 15, 2013 | 1999 Hyundai Sonata

1 Answer

Have 2006 gmc canyon having trouble with it staying on.3.5 engine starts up,stays on a few seconds then shuts off shows reduced power on panel.won't crank over .have to wait a few minutes then it


REDUCED POWER
Refer to:
• Powertrain Control Module Description for the 2.8L engine
• Powertrain Control Module Description for the 3.5L engine

Throttle Actuator Control (TAC) System
Throttle Actuator Control (TAC) Overview
The throttle actuator control (TAC) system uses vehicle electronics and components to calculate and control the position of the throttle blade. This eliminates the need for a mechanical cable attachment from the accelerator pedal to the throttle body. This system also performs the cruise control functions as well.
The TAC system components include, but are not limited to the following:
• The accelerator pedal position (APP) sensors
• The throttle body
• The powertrain control module (PCM)
Each of these components interface together to ensure accurate calculations and control of the throttle position.

Accelerator Pedal Position (APP) Sensor
The accelerator pedal position (APP) sensor is mounted on the accelerator pedal assembly. The APP is 2 individual APP sensors within one housing. There are 2 separate signal, low reference, and 5-volt reference circuits. APP sensor 1 voltage increases as the accelerator pedal is depressed. APP sensor 2 voltage decreases as the accelerator pedal is depressed.
Throttle Body Assembly
The throttle body for the throttle actuator control (TAC) system is similar to a conventional throttle body with several exceptions. One exception being the use of a motor to control the throttle position instead of a mechanical cable. Another exception is the throttle position (TP) sensor. The TP sensor is mounted in the throttle body assembly. The TP sensor is 2 individual TP sensors within the throttle body assembly. Two separate signals, low reference, and 5-volt reference circuits are used to connect the TP sensors and the powertrain control module (PCM). TP sensor 2 signal voltage increases as the throttle opens. TP sensor 1 signal voltage decreases as the throttle opens.

Reduced Engine Power Mode
When the PCM detects a problem with the throttle actuator control (TAC) system the PCM enters one of the following Reduced Engine Power Modes:
• Acceleration Limiting--The control module will continue to use the accelerator pedal for throttle control, however the vehicle acceleration is limited.
• Limited Throttle Mode--The control module will continue to use the accelerator pedal for throttle control, however the maximum throttle opening is limited.
• Throttle Default Mode--The control module will turn OFF the throttle actuator.
• Forced Idle Mode--The control module will perform the following actions:
- Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned OFF.
- Ignore accelerator pedal input.
• Engine Shutdown Mode--The control module will disable fuel and de-energize the throttle actuator.

Have you had it checked for DTC'S - diagnostic trouble codes ?

DTC P2176
The commanded throttle position (TP) is compared to the actual TP. Both values should be within a calibrated range of each other. The powertrain control module (PCM) continuously monitors the commanded and actual TPs. If the values are greater than the calibrated range, DTC P2176 sets.
--------------------------------------------------------------------------------
DTC P2138
The accelerator pedal position (APP) sensors 1 and 2 are located within the accelerator pedal assembly. Each sensor has the following circuits:
• A 5-volt reference circuit
• A low reference circuit
• A signal circuit
This provides the powertrain control module (PCM) with a signal voltage proportional to accelerator pedal movement. The APP sensor 1 signal voltage at rest position is near the low reference and increases as the pedal is actuated. The APP sensor 2 signal voltage at rest position is near the 5-volt reference and decreases as the pedal is actuated.
DTC P2135
The throttle actuator control (TAC) assembly has 2 throttle position (TP) sensors mounted within the assembly. The powertrain control module (PCM) provides individual signal, ground, and 5-volt reference circuits to each sensor. Both sensors operate within a voltage range between 0.35-4.65 volts. When the throttle is opened from 0-100 percent, one sensor signal voltage increases while the other decreases. The signal circuit for TP sensor 1 is referenced to ground, and the signal circuit for TP sensor 2 is pulled up to 5 volts within the PCM.
DTC P2128
DTC P2127
DTC P2125
DTC P2123

Drive by Wire Function and diagnostics by Wells

May 25, 2017 | 2006 GMC Canyon

1 Answer

Trouble code p2106 for 2005 ford explorer 4x4 v-8 4.6lt engine




icon1.gif RE: code p2106 /p2175 question The sensor on the pedal is called the (APPS) accelorator positon sensor which sends to the throttle body. The throttle body is the problem in this case.

Mar 03, 2011 | 2005 Ford Explorer

1 Answer

1994 chevy with 5.7 L with throttle body inj. when i start it the idle drops down and sometimes dies. when you put it in gear idle drops really bad and sometimes dies. once i'm going down the road the...


Sounds like you have a vacuum leak. When the engine is cold the leak is there but as the engine warms up the parts start to expand thus closing the gaps and sealing the leak. I had this problem on my personal vehicle and it turned out to be lower intake gaskets.

Jan 29, 2011 | 1994 Chevrolet C1500

2 Answers

Vehicle stalling at traffic stop like im about to run out of gas


Start with the simple and replace your fuel filter and clean your throttle body, When cleaning your throttle body pay attention to your IAC (Idle Air Control) valve passage way with is located on the back side to your throttle body air intake barrel.
Just follow the instructions on the spray can of throttle body cleaner and be safe. This should address your stalling issues from a dirty IAC valve.
Thank you for suing Fixya and be safe.

Apr 18, 2010 | 1996 Chevrolet Blazer

1 Answer

Starts fine,idles fine,stalls when put in gear to drive away


Try depressing slightly the gas pedal to see if the engine continues to run when you put it in gear. Might have to depredd gas pedal and brake simultaniusly. if the engine continues to run, then the problem is in the idle circuit. Try decarboning the throttle body and the idle speed control.

Mar 26, 2010 | 1989 Honda Accord 4 Door

2 Answers

Wont hold idle will start with foot depressing gas pedal will run with foot on gas but stalls when foot removed


Check and clean Idle air control valve. Make sure its responding to signal as well. Also make sure ther are no vacuum hoses disconnected. This may not be a "cure" but it's a good place to start.

Apr 14, 2009 | 2001 Jeep Grand Cherokee

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