Question about 2006 Chevrolet Aveo
My engine light came on and it was the Accelerator Pedal Position sensor (APP). Before we could afford the part, we went to drive it one night, and it jerked and jumped. We parked it and tried to start it 2 days later, but it wouldn't even start.
It took us almost 2 weeks to afford the part, the car just sat there.
Now, we put the part in, but it's running rough and sputtering. We changed the spark plugs and it's a little better.
We put some fuel injector cleaner in, too.
When a vehicle has sat for awhile i put 93 octane gas to clear away the buildup
Posted on Jan 16, 2009
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Posted on Jan 02, 2017
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Aug 30, 2016 | Cars & Trucks
The accelerator pedal
The accelerator pedal position (APP) sensor 1
The APP sensor 2
The throttle body assembly includes the following components:
The throttle position (TP) sensor 1
The TP sensor 2
The throttle actuator motor
The throttle plate
The engine control module (ECM)
The ECM monitors the driver demand for acceleration with 2 APP sensors. The APP sensor 1 signal voltage range is from about 0.98-4.16 volts as the accelerator pedal is moved from the rest pedal position to the full pedal travel position. The APP sensor 2 range is from about 0.49-2.08 volts as the accelerator pedal is moved from the rest pedal position to the full pedal travel position. The ECM processes this information along with other sensor inputs to command the throttle plate to a certain position.
The throttle plate is controlled with a direct current motor called a throttle actuator control motor. The ECM can move this motor in the forward or reverse direction by controlling battery voltage and/or ground to 2 internal drivers. The throttle plate is held at a 7 percent rest position using a constant force return spring. This spring holds the throttle plate to the rest position when there is no current flowing to the actuator motor.
The ECM monitors the throttle plate angle with 2 TP sensors. The TP sensor 1 signal voltage range is from about 0.5-4.25 volts as the throttle plate is moved from 0 percent to wide open throttle (WOT). The TP sensor 2 voltage range is from about 4.45-0.7 volts as the throttle plate is moved from 0 percent to WOT.
The ECM performs diagnostics that monitor the voltage levels of both APP sensors, both TP sensors, and the throttle actuator control motor circuit. It also monitors the spring return rate of both return springs that are housed internal to the throttle body assembly. These diagnostics are performed at different times based on whether the engine is running, not running, or whether the ECM is currently in a throttle body relearn procedure.
Every ignition cycle, the ECM performs a quick throttle return spring test to make sure the throttle plate can return to the 7 percent rest position from the 0 percent position. This is to ensure that the throttle plate can be brought to the rest position in case of an actuator motor circuit failure. Observe, under cold conditions, the ECM commands the throttle plate to 7 percent with the ignition ON and the engine OFF to release any ice that may have formed on the throttle plate.
Aug 21, 2016 | Cars & Trucks
Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control, however, the maximum throttle opening is limited.
Throttle default mode--The ECM will turn OFF the throttle actuator motor and the throttle will return to the spring loaded default position.
Forced idle mode--The ECM will perform the following actions:
Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned OFF
Ignore the accelerator pedal input
Engine shutdown mode--The ECM will disable fuel and de-energize the throttle actuator.
Did you have it checked for DTC's - diagnostic trouble code's related to the reduced engine power ?
All so has APP sensor gas pedal !
Accelerator Pedal Position (APP) Sensor
The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits:
A 5-volt reference circuit
A low reference circuit
A signal circuit
The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is less than 1 volt and increases to more than 4 volts as the pedal is actuated. The APP sensor 2 signal voltage at rest position is less than 0.6 volt and increases to more than 2 volts as the pedal is actuated.
Your best bet is take your vehicle to the dealer !
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Fig. 5.4L APP sensor connector
Fig. APP Diagnostic resistance chart
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Throttle position (TP) sensor C/accelerator pedal
position (APP) sensor ? - range/performance problem
Possible Causes: Accelerator cable adjustment, TP/APP sensor
Throttle position (TP) switch C/accelerator pedal position
(APP) switch ? - range/performance problem
Accelerator cable adjustment, TP/APP switch
This might only be an adjustment issue--make sure the throttle cable isn't so tight that the throttle cannot fully close.
If the cable is OK, it is probably the accelerator position sensor under the pedal.
There are procedures for testing the unit that I will paste below if you care to try them.
If you just want a shop to fix it, the part is about $50 and labor should only be 30 minutes.
Operation The sensor is made up of the two individual sensors within a single housing. Each sensor has a unique functionality to determine pedal position. The APP system along with the Powertrain Control Module (PCM) is used to calculate and control the amount of acceleration and deceleration through fuel injector control.
Removal & Installation
Fig. APP sensor mounting
Oct 06, 2010 | Chevrolet Tahoe Cars & Trucks
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