Engine Controls Schematics. Buick LaCrosse 2005

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2005 🢒 LaCrosse 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Engine Controls Schematics

Figure 1:	Module Power, Ground, Serial Data, and MIL Master Electrical Component List Powertrain Control Module Description Control Module References 5 Volt and Low Reference OBD II Symbol Description Notice Ignition Switch Ignition Switch G101, G102, G103, G111, G112, and G113 Fuse Block - Underhood B+ Bus Fuse Block - Underhood ABS, TRANS SOL, PCM, SIR, and DISPLAY Fuses, CRANK Relay, and Fuse Block - I/P CRUISE SW Fuse Fuse Block - Underhood B+ Bus G101, G102, G103, G111, G112, and G113 L26
Figure 2:	5-Volt and Low Reference Master Electrical Component List Powertrain Control Module Description Control Module References Pressure and Temperature Sensors Module Power, Ground, Serial Data, and MIL OBD II Symbol Description Notice
Figure 3:	Pressure and Temperature Sensors Master Electrical Component List Exhaust Gas Recirculation (EGR) System Description Control Module References MAF, VSS 5 Volt and Low Reference OBD II Symbol Description Notice
Figure 4:	MAF, VSS Master Electrical Component List Exhaust Gas Recirculation (EGR) System Description Control Module References Oxygen Sensors Pressure and Temperature Sensors OBD II Symbol Description Notice Fuse Block - Underhood B+ Bus Fuse Block - Underhood ETC, ELEK IGN (L26), FUEL INJ (L26), 02 SSR (L26), and EMISSION Fuses Fuse Block - Underhood ETC, ELEK IGN (L26), FUEL INJ (L26), 02 SSR (L26), and EMISSION Fuses PC Solenoid Valve, Fluid Pressure Manual Valve Position Switch, ISS and VSS Sensors (L26) G101, G102, G103, G111, G112, and G113
Figure 5:	Oxygen Sensors Master Electrical Component List Powertrain Control Module Description Control Module References Electronic Throttle Controls MAF, VSS OBD II Symbol Description Notice Fuse Block - Underhood B+ Bus
Figure 6:	Electronic Throttle Controls Master Electrical Component List Throttle Actuator Control (TAC) System Description Control Module References Ignition Controls Oxygen Sensors OBD II Symbol Description Notice Fuse Block - Underhood B+ Bus Rear Parking Assist Schematics G101, G102, G103, G111, G112, and G113
Figure 7:	Ignition Controls Master Electrical Component List Electronic Ignition (EI) System Description Control Module References Fuel Pump Controls Electronic Throttle Controls OBD II Symbol Description Notice Fuse Block - Underhood B+ Bus Indicators, Stop Lamp, Traction Controls, and Serial Data G101, G102, G103, G111, G112, and G113
Figure 8:	Fuel Pump Controls Master Electrical Component List Fuel System Description Control Module References Fuel Injectors Ignition Controls OBD II Symbol Description Notice Fuse Block - Underhood B+ Bus G101, G102, G103, G111, G112, and G113 Power, Ground, Serial Data, and Gages (L26) G302 G101, G102, G103, G111, G112, and G113
Figure 9:	Fuel Injectors Master Electrical Component List Fuel System Description Control Module References EVAP, EGR, and FTP Controls Fuel Pump Controls OBD II Symbol Description Notice Fuse Block - Underhood B+ Bus
Figure 10:	EVAP, EGR, and FTP Controls Master Electrical Component List Evaporative Emission Control System Description Control Module References AIR Controls (NU3) Fuel Injectors OBD II Symbol Description Notice Power, Ground, Serial Data, and Gages (L26) Fuse Block - Underhood BATT MAIN 1 Fuse, Fuse Block - I/P PK LAMPS, DISPLAYS, CHMSL/BKUP, INT LIGHT, RFA/MOD, RADIO/AMP, ONSTAR/ALDL, HVAC, and CANISTER Fuses and PK LP Relay Fuse Block - Underhood B+ Bus Fuse Block - Underhood ETC, ELEK IGN (L26), FUEL INJ (L26), 02 SSR (L26), and EMISSION Fuses Fuse Block - Underhood ETC, ELEK IGN (L26), FUEL INJ (L26), 02 SSR (L26), and EMISSION Fuses
Figure 11:	AIR Controls (NU3) Master Electrical Component List Secondary Air Injection System Description Control Module References Controlled/Monitored Subsystem References EVAP, EGR, and FTP Controls OBD II Symbol Description Notice Fuse Block - Underhood ETC, ELEK IGN (L26), FUEL INJ (L26), 02 SSR (L26), and EMISSION Fuses Fuse Block - Underhood B+ Bus G101, G102, G103, G111, G112, and G113 G115 (L26)
Figure 12:	Controlled/Monitored Subsystem References Master Electrical Component List Powertrain Control Module Description Control Module References A/T Control References AIR Controls (NU3) OBD II Symbol Description Notice Compressor Controls and Serial Data (L26) Compressor Controls and Serial Data Engine Cooling Schematics Starting - L26 Charging Ambient Air Temperature Sensor, Electronic Compass Module, and Oil Level Switch Indicators (U2E) Indicators (UH8) L26
Figure 13:	A/T Control References Master Electrical Component List Powertrain Control Module Description Control Module References Controlled/Monitored Subsystem References OBD II Symbol Description Notice Shift and TCC Solenoid Valves, TFT Sensor, and Stop Lamp Switch (L26) Internal Mode Switch (L26) PC Solenoid Valve, Fluid Pressure Manual Valve Position Switch, ISS and VSS Sensors (L26)