Engine Controls - 3.5L - Introduction (2 of 2): Overhaul Chevrolet Uplander I

Disassembly Procedure

1. Place the fuel tank in a suitable work area.
2. Remove the EVAP canister (2). Refer to «Evaporative Emission (EVAP) Canister Replacement (Short Wheel Base)»(ref-241686-S10889344492006081100000) or «Evaporative Emission (EVAP) Canister Replacement (Long Wheel Base)»(ref-241686-S27826968602006081100000) .
3. Remove the EVAP canister vent valve (3). Refer to «Evaporative Emission (EVAP) Canister Vent Solenoid Valve Replacement (Short Wheel Base)»(ref-241686-S25595115482006081100000) or «Evaporative Emission (EVAP) Canister Vent Solenoid Valve Replacement (Long Wheel Base)»(ref-241686-S18804379522006081100000) .
4. Remove the fuel sender assembly (4). Refer to «Fuel Sender Assembly Replacement (Short Wheel Base)»(ref-241686-S15846078452006081100000) or «Fuel Sender Assembly Replacement (Long Wheel Base)»(ref-241686-S16597493802006081100000) .
5. Remove the fuel feed pipe (1) from the fuel tank pipe clips.
6. Remove the EVAP purge pipe (6) from the fuel tank pipe clip.

Assembly Procedure

1. Install the EVAP purge pipe (6) into the fuel tank clip.
2. Install the fuel feed pipe (1) into the fuel tank pipe clips.
3. Install the fuel sender assembly (4). Refer to «Fuel Sender Assembly Replacement (Short Wheel Base)»(ref-241686-S15846078452006081100000) or «Fuel Sender Assembly Replacement (Long Wheel Base)»(ref-241686-S16597493802006081100000) .
4. Install the EVAP canister vent valve (3). Refer to «Evaporative Emission (EVAP) Canister Vent Solenoid Valve Replacement (Short Wheel Base)»(ref-241686-S25595115482006081100000) or «Evaporative Emission (EVAP) Canister Vent Solenoid Valve Replacement (Long Wheel Base)»(ref-241686-S18804379522006081100000) .
5. Install the EVAP canister (2). Refer to «Evaporative Emission (EVAP) Canister Replacement (Short Wheel Base)»(ref-241686-S10889344492006081100000) or «Evaporative Emission (EVAP) Canister Replacement (Long Wheel Base)»(ref-241686-S27826968602006081100000) .

Throttle Body Assembly

The throttle assembly contains the following components

1. The throttle blade
2. The throttle actuator motor
3. The throttle position (TP) sensor 1 and 2
4. The throttle actuator control (TAC) module

The throttle body functions similar to a conventional throttle body with the following exceptions

1. There is no longer an idle air control (IAC) motor and associated air passages.
2. An electric motor opens and closes the throttle valve.
3. The TAC module is located within the throttle body assembly.
4. The throttle blade is spring loaded in both directions and the default position is slightly open.
5. There are 2 individual TP sensors within the throttle body assembly.

The TP sensors are used to determine the throttle plate angle. The TP sensors provide the powertrain control module (PCM) with a signal voltage proportional to throttle plate movement. Both TP sensor signal voltages are low at closed throttle and increase as the throttle opens.