Engine Control System - 4.8L, 5.3L, & 6.0L (Introduction): Overhaul Chevrolet SSR I

Disassembly Procedure

1. Remove the EVAP vent valve (1). Refer to «Evaporative Emission (EVAP) Canister Vent Solenoid Valve Replacement»(ref-187797-S28777930762005090100000) .
2. Remove the fuel filter (8). Refer to «Fuel Filter Replacement»(ref-187797-S16549352042005090100000) .
3. Disconnect the fuel feed and return pipes from the fuel sender (5). Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(ref-187797-S01446972332005090100000) .
4. Remove the fuel feed and return pipes from the retaining clip (7).
5. Remove the EVAP vent valve pipe.
6. Disconnect the EVAP vapor pipe from the fill limiter vent valve (4), and the front and rear rollover valves (2, 6). Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(ref-187797-S01446972332005090100000) .
7. Remove the EVAP vapor pipes.
8. Remove the fuel sender assembly (5) from the fuel tank. Refer to «Fuel Sender Assembly Replacement»(ref-187797-S28592554922005090100000) .
9. Remove the EVAP canister (3). Refer to «Evaporative Emission (EVAP) Canister Replacement»(ref-187797-S25462990892005090100000) .

Assembly Procedure

1. Install the EVAP canister (3). Refer to «Evaporative Emission (EVAP) Canister Replacement»(ref-187797-S25462990892005090100000) .
2. Install the fuel sender assembly (5) to the fuel tank. Refer to «Fuel Sender Assembly Replacement»(ref-187797-S28592554922005090100000) .
3. Connect the EVAP vapor pipe to the fill limiter vent valve (4) and the front and rear rollover valve (2, 6). Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(ref-187797-S01446972332005090100000) .
4. Install the EVAP vent valve pipe.
5. Connect the fuel feed and return pipes to the fuel sender (5). Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(ref-187797-S01446972332005090100000) .
6. Install the fuel feed and return pipes to the retaining clip (7).
7. Install the fuel filter (8). Refer to «Fuel Filter Replacement»(ref-187797-S16549352042005090100000) .
8. Install the EVAP vent valve (1). Refer to «Evaporative Emission (EVAP) Canister Vent Solenoid Valve Replacement»(ref-187797-S28777930762005090100000) .

Throttle Body Assembly

The throttle body assembly consists of the throttle body, the throttle position (TP) sensors, and the throttle actuator motor. The throttle body functions similar to a similar to a conventional throttle body with the following exceptions

1. An electric motor opens and closes the throttle valve.
2. The throttle blade is spring loaded in both directions and the default position is slightly open.
3. There are 2 individual TP sensors within the throttle body assembly.

The TP sensors 1 and 2 are potentiometer type sensors, each with the following circuits

1. A 5-volt reference circuit
2. A low reference circuit
3. A signal circuit

The TP sensors are used to determine the throttle plate angle. The control module provides each TP sensor a 5-volt reference circuit and a low reference circuit. The TP sensors then provide the control module with signal voltage proportional to throttle plate movement. Both TP sensor signal voltages are low at closed throttle and increase as the throttle opens.