Injection and engine management system Chevrolet Tahoe 2 and 3
Description of the injection system and its elements
Engine control unit Power unit (engine and automatic transmission) has electronic control in order to reduce toxic emissions with exhaust gases while...
Engine control unit Power unit (engine and automatic transmission) has electronic control in order to reduce toxic emissions with exhaust gases while...
Engine Controls — Component Locations
The OBD II symbol is used on schematic diagrams to inform the technician that the circuit is essential to the proper operation of the OBD II on-board...
The OBD II symbol is used on schematic diagrams to inform the technician that the circuit is essential to the proper operation of the OBD II on-board...
Engine control unit
Repair of the engine control unit (ECM) comes down to either replacing the unit or reprogramming the EEPROM RAM. If the decision to replace the ECM is made as...
Repair of the engine control unit (ECM) comes down to either replacing the unit or reprogramming the EEPROM RAM. If the decision to replace the ECM is made as...
Crankshaft Position Measurement System Training
1. Connect the scanner. 2. Read the fault codes recorded in the control unit memory. If other fault codes are recorded in addition to the P0315 code, perform...
1. Connect the scanner. 2. Read the fault codes recorded in the control unit memory. If other fault codes are recorded in addition to the P0315 code, perform...
Throttle actuator training
The engine control unit determines the throttle positions at idle to provide a set idle speed. When flushing or replacing the throttle body, the ECM must...
The engine control unit determines the throttle positions at idle to provide a set idle speed. When flushing or replacing the throttle body, the ECM must...
Throttle actuator control unit (early models)
Removal 1. Disconnect the instrument panel connector (2). 2. Release the red lock of the control unit connector. 3. Disconnect the control unit connector (1)....
Removal 1. Disconnect the instrument panel connector (2). 2. Release the red lock of the control unit connector. 3. Disconnect the control unit connector (1)....
Coolant temperature sensor
Removal Note: Handle the sensor with care. Damage to the sensor will adversely affect the operation of the fuel injection system. 1. Drain the cooling system...
Removal Note: Handle the sensor with care. Damage to the sensor will adversely affect the operation of the fuel injection system. 1. Drain the cooling system...
Air flow/air temperature sensor
Removal Caution: Handle the sensor with care. Do not press or puncture the sensor to avoid damaging the measuring cells located on the end of the sensor. Do...
Removal Caution: Handle the sensor with care. Do not press or puncture the sensor to avoid damaging the measuring cells located on the end of the sensor. Do...
Manifold Absolute Pressure Sensor
Removal 1. Remove the top engine cover. 2. Disconnect the connector (4) (late models) or (1) (early models) absolute air pressure sensor. Late models Early...
Removal 1. Remove the top engine cover. 2. Disconnect the connector (4) (late models) or (1) (early models) absolute air pressure sensor. Late models Early...
Brake booster vacuum sensor
Removal 1. Disconnect the vacuum sensor connector (1). 2. Remove the vacuum sensor from the brake booster. 3. Remove the sensor sealing ring. Installation 4....
Removal 1. Disconnect the vacuum sensor connector (1). 2. Remove the vacuum sensor from the brake booster. 3. Remove the sensor sealing ring. Installation 4....
Oxygen sensor — removal and installation
Note: A special anti-stick compound is applied to the oxygen sensor thread to facilitate removal. New sensors are supplied with the compound pre-applied. When...
Note: A special anti-stick compound is applied to the oxygen sensor thread to facilitate removal. New sensors are supplied with the compound pre-applied. When...
Accelerator pedal position sensor
Removal Caution: Handle electronic throttle control components with care (accelerator pedal) caution: Do not drop the accelerator pedal. Do not immerse...
Removal Caution: Handle electronic throttle control components with care (accelerator pedal) caution: Do not drop the accelerator pedal. Do not immerse...
Throttle body
Removal Caution: Handle the electronic components of the throttle control system with care. Do not drop the throttle body. Do not immerse the throttle control...
Removal Caution: Handle the electronic components of the throttle control system with care. Do not drop the throttle body. Do not immerse the throttle control...
Relieving pressure in the fuel system
Caution: Before servicing the fuel system, remove the fuel filler cap and relieve pressure to reduce the risk of injury. Note: When disconnecting the fuel line...
Caution: Before servicing the fuel system, remove the fuel filler cap and relieve pressure to reduce the risk of injury. Note: When disconnecting the fuel line...
Servicing fuel line connectors
Note: A special tool is required to disconnect the fuel line connectors. Disconnection Metal connectors 1. Relieve pressure in the fuel system. 2. Remove the...
Note: A special tool is required to disconnect the fuel line connectors. Disconnection Metal connectors 1. Relieve pressure in the fuel system. 2. Remove the...
Draining the fuel tank
Front or single tank 1. Unscrew the fuel tank filler cap. 2. Raise the vehicle and place safety posts under the frame. 3. Loosen the clamp (1) securing the...
Front or single tank 1. Unscrew the fuel tank filler cap. 2. Raise the vehicle and place safety posts under the frame. 3. Loosen the clamp (1) securing the...
Fuel tank filler pipe
Removal Caution: Before disconnecting fuel lines, clean the connectors and surrounding areas to prevent dirt from entering the system. Series 1500 1. Remove...
Removal Caution: Before disconnecting fuel lines, clean the connectors and surrounding areas to prevent dirt from entering the system. Series 1500 1. Remove...
Fuel tank — removal and installation
Caution: Before disconnecting fuel lines, clean the connectors and surrounding areas to prevent dirt from entering the system. Note: The configuration of the...
Caution: Before disconnecting fuel lines, clean the connectors and surrounding areas to prevent dirt from entering the system. Note: The configuration of the...
Fuel tank pressure sensor
Series 1500 1. Remove the fuel tank. 2. If necessary, disconnect the fuel vapor recovery system tube from the fuel tank vent valve. 3. Using gentle rocking...
Series 1500 1. Remove the fuel tank. 2. If necessary, disconnect the fuel vapor recovery system tube from the fuel tank vent valve. 3. Using gentle rocking...
Fuel pump module
Removal 1. Removal of the fuel pump module is described in the section " Fuel tank " chapter "Fuel injection system". Installation 2. Installation is carried...
Removal 1. Removal of the fuel pump module is described in the section " Fuel tank " chapter "Fuel injection system". Installation 2. Installation is carried...
Fuel level sensor — removal and installation
Series 1500 1. Remove the fuel pump module (see section " Fuel tank " in the chapter "Fuel injection system"). 2. Using a small screwdriver, press the holder...
Series 1500 1. Remove the fuel pump module (see section " Fuel tank " in the chapter "Fuel injection system"). 2. Using a small screwdriver, press the holder...
Fuel lines and hoses on the chassis
Caution: Before disconnecting tube/hose connectors, clean the areas around the connector. Removal and installation 1. Relieve pressure in the fuel system. 2....
Caution: Before disconnecting tube/hose connectors, clean the areas around the connector. Removal and installation 1. Relieve pressure in the fuel system. 2....
Cleaning the fuel system
Caution: Use oil-free compressed air to blow out fuel lines. 1. Disconnect the negative battery cable. 2. Remove the fuel pump module. 3. Check the condition...
Caution: Use oil-free compressed air to blow out fuel lines. 1. Disconnect the negative battery cable. 2. Remove the fuel pump module. 3. Check the condition...
Fuel manifold, bypass pipe and injectors
Removal Note: Fuel manifold parts are marked with identification numbers. When replacing manifold parts, install parts with the same number. 1. Remove the air...
Removal Note: Fuel manifold parts are marked with identification numbers. When replacing manifold parts, install parts with the same number. 1. Remove the air...
Fuel vapor canister purge valve
Removal Early models 1. Remove the top engine cover. 2. Disconnect the fuel vapor recovery system tube from the valve. 3. Disconnect the valve connector (1)....
Removal Early models 1. Remove the top engine cover. 2. Disconnect the fuel vapor recovery system tube from the valve. 3. Disconnect the valve connector (1)....
Cleaning the fuel injector
It is recommended that injector cleaning be carried out in a specialized workshop using special equipment and a special liquid. Warning: Do not use non-GM...
It is recommended that injector cleaning be carried out in a specialized workshop using special equipment and a special liquid. Warning: Do not use non-GM...
Fuel vapor canister purge solenoid valve
Removal Early models 1. Raise the vehicle and place safety posts under the frame. 2. Disconnect the purge valve connector (1). 3. Disconnect the quick...
Removal Early models 1. Raise the vehicle and place safety posts under the frame. 2. Disconnect the purge valve connector (1). 3. Disconnect the quick...
Fuel Evaporative Recovery System Hoses and Tubes
On the fuel tank 1. Remove the fuel tank. 2. Further see the procedure for disassembling the fuel tank in the section " Fuel tank ". On the engine 1. Remove...
On the fuel tank 1. Remove the fuel tank. 2. Further see the procedure for disassembling the fuel tank in the section " Fuel tank ". On the engine 1. Remove...
Fuel vapor accumulator — removal and installation
1500 Series, Early Models 1. Raise the vehicle and place safety posts under the frame. 2. Disconnect all tubes and hoses from the vapor accumulator. 3. Plug...
1500 Series, Early Models 1. Raise the vehicle and place safety posts under the frame. 2. Disconnect all tubes and hoses from the vapor accumulator. 3. Plug...
Cleaning the fuel vapor recovery system
Warning: Do not perform this procedure unless recommended by the on-board diagnostic system. Cleaning of the system must be performed at a service station...
Warning: Do not perform this procedure unless recommended by the on-board diagnostic system. Cleaning of the system must be performed at a service station...
Ignition coils — removal and installation
1. Remove the top engine cover. 2. Disconnect the ignition coil wiring connector (1). 3. Remove the spark plug wire from the ignition coil. a) Turn the spark...
1. Remove the top engine cover. 2. Disconnect the ignition coil wiring connector (1). 3. Remove the spark plug wire from the ignition coil. a) Turn the spark...
Spark plug wires
Examination The integrity of the spark plug wires is vital to the proper operation of the engine. A thorough inspection is necessary to accurately identify...
Examination The integrity of the spark plug wires is vital to the proper operation of the engine. A thorough inspection is necessary to accurately identify...
Spark plugs
Examination Make sure the correct spark plugs are installed. The wrong type of spark plug will cause poor engine drivability. Make sure the spark plug is the...
Examination Make sure the correct spark plugs are installed. The wrong type of spark plug will cause poor engine drivability. Make sure the spark plug is the...
Crankshaft position sensor
Removal Caution: Every time the crankshaft position sensor is removed or replaced, it is necessary to perform the "training" procedure of the crankshaft...
Removal Caution: Every time the crankshaft position sensor is removed or replaced, it is necessary to perform the "training" procedure of the crankshaft...
Camshaft Position Sensor
Removal Early models 1. Loosen the sensor mounting bolt. Tightening torque 29 Nm. 2. Remove the sensor. 3. Installation is carried out in reverse order. Late...
Removal Early models 1. Loosen the sensor mounting bolt. Tightening torque 29 Nm. 2. Remove the sensor. 3. Installation is carried out in reverse order. Late...
Knock sensor — removal and installation
Early models 1. Remove the intake manifold. 2. Carefully remove the rubber plugs from the block camber cover. 3. Disconnect the knock sensor wiring connectors....
Early models 1. Remove the intake manifold. 2. Carefully remove the rubber plugs from the block camber cover. 3. Disconnect the knock sensor wiring connectors....
Air filter filter element
Removal 1. Disconnect the air flow/temperature sensor connector (2). 2. Loosen the air filter housing mounting screws. Tightening torque 3 Nm. 3. Remove the...
Removal 1. Disconnect the air flow/temperature sensor connector (2). 2. Loosen the air filter housing mounting screws. Tightening torque 3 Nm. 3. Remove the...
Air filter housing
Removal 1. Remove the air filter housing outlet duct. 2. Disconnect the air flow/temperature sensor connector (2). 3. Pull the front part of the filter housing...
Removal 1. Remove the air filter housing outlet duct. 2. Disconnect the air flow/temperature sensor connector (2). 3. Pull the front part of the filter housing...
Air filter housing outlet duct
Removal 1. Remove the top engine cover. 2. Disconnect the crankcase ventilation hose from the air duct. 3. Remove the radiator hose clamp holders from the air...
Removal 1. Remove the top engine cover. 2. Disconnect the crankcase ventilation hose from the air duct. 3. Remove the radiator hose clamp holders from the air...
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