How to Replace Throttle Body 2002-06 Nissan Altima
Created on: 2017-09-05
This video shows you how to replace the throttle body on your 02-06 Nissan Altima. 1A Auto guides you with step by step instructions.
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step 1 :Removing the Air Intake Hose
- Loosen the hose clamp from the breather hose
- Slide the breather hose off
- Loosen the air intake hose clamps with an 8mm socket
- Slide the hose off of the throttle body and air filter housing
- Remove the hose
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step 2 :Removing the Throttle Body
- Disconnect the wiring harness
- Remove the four 5mm Allen head bolts
- Remove the throttle body
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step 3 :Installing the Throttle Body
- Spray brake parts cleaner onto a rag
- Wipe down the mating surface on the intake manifold
- Press the gasket onto the throttle body
- Insert the screws into the throttle body
- Press the throttle body to the intake manifold
- Tighten the four 5mm Allen bolts
- Torque the bolts to 64-84 inch-pounds or 5-7 foot-pounds
- Connect the wiring harness
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step 4 :Installing the Air Intake Hose
- Insert the intake hose to air filter housing and the throttle body
- Tighten the hose clamps on each end with an 8mm socket and ratchet
- Slide the breather hose on
- Clamp the hose clamp with needle nose pliers
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step 5 :Accelerator Pedal Release Position Learning
- Do not depress the accelerator pedal
- Turn the key to the ON position for atleast 2 seconds
- Turn the key to the OFF position for 10 seconds
- Turn the key to the ON position for 2 seconds
- Turn the key to the OFF position for 10 seconds
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step 6 :Throttle Valve Close Position Learning
- Do not depress the accelerator pedal
- Turn the key to the ON position for 10 seconds
- Turn the key to the OFF position and listen for the throttle body making a whining sound
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step 7 :Idle Air Volume Learning
- Run the vehicle up the operating temperature with the vehicle in park, the steering wheel straightened, and the headlights and A/C and other electrical loads off
- At idle, make sure the vehicle has more than 12.9 volts at the battery
- Let the vehicle reach up to temp
- Turn the vehicle off
- Let the ignition be off for 10 seconds
- Do not depress the accelerator pedal
- Turn the key to the ON position and wait 3 seconds
- Press the accelerator pedal five times in 5 seconds
- Wait for 7 seconds
- Check engine light should flash
- Hold the accelerator pedal down for 20 seconds
- Release the accelerator pedal within 3 seconds when the engine light stops blinking
- Start the engine and let it idle
- Rev the engine a couple of times
- Confirm the engine returns to the correct idle (around 700 RPM in park for automatic transmission)
- Confirm there is no check engine light
Tools needed
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5mm Hex Wrench
Socket Extensions
Flat Blade Screwdriver
Paper Towels
8mm Socket
10mm Socket
Ratchet
Brake Parts Cleaner
We've got the hood off, and we're going to take this engine cover off just so it's easier for you to see, but you don't have to do this. Remove this breather hose from the intake. Squeeze the clamp with some needle nose pliers. Move the clamp down the hose. Pull the hose off the plastic tube. Remove the hose clamp from the intake tube. You can use a flat bladed screwdriver or an eight millimeter socket. Sometimes these clamps use an eight millimeter. This clamp, actually, on here is a 10. I'm just going to switch sockets. Since it's loose, put it over there. Going to pull the hose off the throttle body. Pull the hose off the mass airflow meter. Move this out of the way. This lifts out. I'm going to put this aside.
This is the electronic throttle body. It will require a relearn process after we replace it, and we're going to show you how to do that before we're done. To start, I'll remove this electrical connector here. There's a lock on the back that I'm going to push in and then wiggle the connector off. There are no coolant lines going to this throttle body, so we don't need to drain any coolant. It's held on with four, five millimeter Allen head bolts. I'm just going to start by removing those. With those loose, I'm just going to use my Allen head socket and my extension to remove the bolts. Throttle body is loose. It's only being held on with one bolt, so I'm holding it with the other hand. Remove the final bolt and just unscrew it. As I unscrew it, I'll just lift out the throttle body, so the gasket slid down. And we have our throttle body.
Here's our old throttle body out of our vehicle. See it's pretty carboned up. Here's our new one from 1aauto.com. Can see it is an exact match. Same connector. Same four bolt holes. This one's nice and clean. It's brand new. It's not a re-man. This is our old gasket. This gets flattened out from being installed. This is the new one that came with our throttle body.
So, we're going to install the new gasket and torque this to spec, so this should get your car running and driving perfectly afterwards. Take some brake parts cleaner and a rag. Just wipe down the mounting surface for the throttle body. We want it to be nice and clean for the gasket. I'm going to take the gasket and two of the top bolts. Place them through. Make sure you mount it correctly, because it could go this way. You could try to put it on this way. It won't work very well, but it will go this way.
Place it up against the intake manifold. Thread the bolts in. Get them caught. Let it sit. Install the bottom bolts. Just going to take my five millimeter Allen socket and the extension, and just by hand, get these tight. I will come back with a torque wrench and torque them. These bolts, the torque is 64 to 84 inch pounds, which is about five to seven foot pounds. So, I'm just going to tighten them down evenly by hand until I feel them get tight, and then I'm going to stop. Reconnect the electrical connector.
Reinstall the intake tube. Start out by pushing it over the mass airflow meter tube. Installing it onto the throttle body. Tighten the hose clamp on the throttle body. Line it up in a spot that I can get to it. Reinstall the hose clamp on the mass airflow meter side. Reinstall this breather hose. Don't forget about the clamp.
First step is to perform accelerator released position learning. Do not depress the accelerator pedal. Turn the key on for at least two seconds. So, on for two seconds. Off for ten. On for two seconds. Off for ten. And that should complete that procedure.
To perform the throttle valve close position learning, make sure the accelerator pedal is fully released—so don't put your foot on it. Take the key, turn the ignition on, and wait at least 10 seconds. When you turn the ignition off, you should hear the throttle valve make a whining sound as it returns. That way you confirm that the throttle valve is working.
What we're showing you here with the intake tube off is just what the throttle body is doing during the re-learn process—just to give you a better visual idea.
Now we will perform the idle air volume learning procedure, but before that the car has to meet certain criteria. We need to run it first and get it up to operating temperature and make sure the charging system is putting out at least 12.9 volts.
I'm going to start the car. We're going to let it idle. You want to make sure the headlights are turned off. You want to make sure the A/C is turned off. Basically, no electrical loads. You want to make sure the steering wheel is straight ahead, and that the vehicle is in park.
We're going to let the car come up to operating temperature, and then we'll perform the idle air volume re-learn. At idle, we want to make sure the vehicle has more than 12.9 volts at the battery. It's got more than 12.9 volts, so we're in good shape.
With the vehicle at operating temperature, now we do the idle air volume learning. Now the vehicle is up to temp, and our pre-conditions are met. I'm going to make sure after I shut it off, that the vehicle ignition has been off for at least 10 seconds. It has.
The next step, we're going to turn the ignition on without pressing the accelerator pedal, and wait at least 3 seconds. Now we're going to quickly press the accelerator pedal five times in 5 seconds. Wait 7 seconds. Check engine light will begin to flash. Then you'll hold the accelerator pedal down for 20 seconds. The service engine soon light will stop blinking, and we'll release the accelerator pedal within three seconds.
We'll start the engine. Let it idle. Rev it a couple of times. We'll just confirm that it returns to the correct idle and there's no check engine light on.
So for an automatic transmission vehicle, the engine idle should be around 700 RPM in park or in the neutral position give or take 50 RPM. It looks like we're right about there. When the procedure is complete, you've changed the throttle body.
Thanks for watching. Visit us at 1AAuto.com for quality auto parts, fast and free shipping, and the best customer service in the industry.
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