Chevrolet Trax: Throttle body assembly replacement

Removal Procedure

1. Disconnect the throttle body wiring harness connector.
2. Remove the charge air cooler outlet air hose from the throttle body. Refer to Charge Air Cooler Outlet Air Hose Replacement.

Fig. 12: Throttle Body

3. Remove the 4 throttle body fasteners (3).
4. Remove the throttle body (2) along with the throttle body seal ring (1).

Installation Procedure

Fig. 13: Throttle Body

1. Install the throttle fasteners (3) along with a NEW throttle body seal ring (1).

CAUTION: Refer to Fastener Caution .

2. Install the 4 throttle body fastener (3) and tighten to 8 (71 lb in).
3. Install the charge air cooler outlet air hose to the throttle body. Refer to Charge Air Cooler Outlet Air Hose Replacement.
4. Connect the throttle body wiring harness connector.
5. Perform the throttle/idle learn. Refer to Q38 Throttle Body: Throttle/Idle Learn.

Throttle body inspection and cleaning

NOTE:

Over extended time and mileage, deposits may accumulate on the back of the throttle valve plate. The source of the deposit is exhaust gas. Typically these deposits pose no problem. Occasionally the deposit may accumulate to a point where perceived pedal effort or throttle valve movement is effected. This procedure should not be performed on vehicles with mileage under 80,450 km (50,000 mi).

1. Remove the charge air cooler outlet air hose. Refer to Charge Air Cooler Outlet Air Hose Replacement.

WARNING: Turn OFF the ignition before inserting fingers into the throttle bore.

Unexpected movement of the throttle blade could cause personal injury.

CAUTION: Do not insert any tools into the throttle body bore in order to avoid damage to the throttle valve plate.

2. Inspect the throttle body bore and the throttle valve plate for deposits. You will need to open the throttle valve in order to inspect all surfaces.

CAUTION: Do not use any solvent that contains Methyl Ethyl Ketone (MEK). This solvent may damage fuel system components.

3. Clean the throttle body bore and the throttle valve plate using a clean shop towel with an appropriate cleaner.
4. Install the charge air cooler outlet air hose. Refer to Charge Air Cooler Outlet Air Hose Replacement.

FUEL PRESSURE RELIEF

WARNING: Refer to Gasoline/Gasoline Vapors Warning .

WARNING: Remove the fuel tank cap and relieve the fuel system pressure before servicing the fuel system in order to reduce the risk of personal injury.

After you relieve the fuel system pressure, a small amount of fuel may be released when servicing the fuel lines, the fuel injection pump, or the connections. In order to reduce the risk of personal injury, cover the fuel system components with a shop towel before disconnection. This will catch any fuel that may leak out. Place the towel in an approved container when the disconnection is complete.

1. Disconnect the battery. Refer to Battery Negative Cable Disconnection and Connection
2. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure.
3.  Remove the engine cover, if required.
4. Remove the fuel rail service port cap.
5. Wrap a shop towel around the fuel rail service port and using a small flat bladed tool, depress (open) the fuel rail test port valve.
6. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
7. Install the fuel rail service port cap.
8. Install the engine cover, if required.
9. Tighten the fuel fill cap.

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