ENGINE PERFORMANCE – Buick LaCrosse CX 2009 – SYSTEM WIRING DIAGRAMS

ENGINE PERFORMANCE

3.8L VIN 2

3.8L VIN 2, Engine Performance Wiring Diagram (1 of 5) for Buick LaCrosse CX 2009

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (1 of 5) for Buick LaCrosse CX 2009:

• (lower center front of engine oil pan) engine oil level (eol) switch
• (pins 62-72 not used)
• (top right of intake manifold) manifold absolute pressure (map) sensor
• (top right rear of engine) exhaust gas recirculation (egr) valve
• 5 volt ref 1
• Air sol ctrl
• Cmp sensor
• Ect sensor sig
• Egr pos sig
• Egr sol high
• Egr sol low
• Engine coolant temperature (ect) sensor (top of engine)
• Engine oil pressure (eop) switch
• Evap purge sol
• Evaporative emission (evap) canister purge solenoid valve (top rear of engine)
• Fuel inj 1
• Fuel inj 2
• Fuel inj 3
• Fuel inj 4
• Fuel inj 5
• Fuel inj 6
• Fuel injectors (1: top left of engine) (2: top right of engine) (3: top left center of engine) (4: top right center of engine) (5: top left rear of engine) (6: top right rear of engine)
• G113 (lower left rear of engine, near starter)
• Gen field
• Gen on sig
• Generator
• Ground
• Heated oxygen sensor (ho2s) 1 (right side of engine)
• Ho2s heater 1
• Ho2s sig high
• Ho2s sig low
• Ic timing ctrl
• Ic timing sig
• J101
• J109
• Knock sensor (ks) 1 (left front of engine)
• Knock sensor (ks) 2 (below right exhaust manifold)
• Knock sensor 1
• Knock sensor 2
• Low eng speed
• Low ref
• Map sensor sig
• Med eng speed
• Nca
• Oil level sw
• Oil press sig
• Pnk
• Powertrain control module (pcm)
• Red
• Tan
• Uart data

3.8L VIN 2, Engine Performance Wiring Diagram (2 of 5) for Buick LaCrosse CX 2009

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (2 of 5) for Buick LaCrosse CX 2009:

• (engine wiring harness, 20 cm from g115)
• (front of engine) camshaft position (cmp) sensor
• (in ignition control module wiring harness, 5.5 cm from inline connector x110)
• (lower left front of engine) crankshaft position (ckp) sensor
• (top front of engine)
• (top left front of engine) ignition coil module (icm)
• 5 volt ref
• A11
• Accelerator (app) pedal position sensor (left side of dash)
• App sensor 1
• App sensor 2
• Body control module (bcm) (left side of dash)
• C11
• Elek ign fuse 24 15a
• Etc fuse 17 15a
• Fuel inj fuse 20 15a
• G112
• G113 (lower left front of engine, near starter)
• G113 (lower left rear of engine, near starter)
• Ground
• Hot w/ ign1 relay 37 energized
• Ign 1 volt
• Ignition coil
• J101
• J102
• J144
• J145
• Logic
• Low ref
• Pnk
• Primary uart
• Sec uart
• Secondary air injection (air) control solenoid valve/pressure sensor bank 2 (pzev) (top of engine)
• Secondary air injection (air) pump solenoid relay (pzev) (near air cleaner duct)
• Spark plugs
• Stop lamp
• Stop lamp switch signal
• Tan
• Throttle actuator control (tac) module (at throttle body)
• To p/train relay (diagram 4 of 5)
• Trans sol fuse 21 10a
• Underhood fuse block (right front strut tower)
• Vehicle spd

3.8L VIN 2, Engine Performance Wiring Diagram (3 of 5) for Buick LaCrosse CX 2009

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (3 of 5) for Buick LaCrosse CX 2009:

• 1-2 shift solenoid (ss) valve
• 2-3 shift solenoid valve
• A red
• A/t fluid pressure (tfp) manual valve position switch
• A/t fluid temperature sensor
• A/t input shaft speed sensor
• Air pres sens
• At iss sig
• Automatic transmission
• Automatic transmission internal mode switch (ims)
• B tan
• G113 (lower left rear of engine, near starter)
• Ho2s heater 2
• Ho2s sig high
• Ho2s sig low
• Iat sensor sig
• Low ref
• Maf sensor sig
• Pc sol
• Pnk
• Powertrain control module (pcm)
• Pressure control solenoid valve
• Red j115
• Shift sol
• Tan
• Tcc sol
• Tcc sw sig
• Tft sensor sig
• Torque converter clutch (tcc) solenoid valve
• Torque sig
• Tr sw a
• Tr sw b
• Tr sw c
• Tr sw p
• Vehicle speed sensor (vss) assembly (right side of transmission)
• Vss sig
• W (not used)

3.8L VIN 2, Engine Performance Wiring Diagram (4 of 5) for Buick LaCrosse CX 2009

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (4 of 5) for Buick LaCrosse CX 2009:

• (in air intake tube) mass air flow (maf)/intake air temperature (iat) sensor
• (pzev) (near air cleaner duct)
• Air pump fuse 25 50a
• D11
• Electronic brake control module (ebcm) (integral to brake pressure modulator valve)
• Emission fuse 12 10a
• Evaporative emissions (evap) canister vent solenoid valve (under left rear of vehicle)
• F12
• From etc fuse 17 (diagram 2 of 5)
• Fuel pp fuse 22 15a
• Fuel pp relay
• G113 (lower left rear of engine, near starter)
• G115 (left rear of engine)
• Heated oxygen sensor (ho2s) 2 (downstream of catalytic converter)
• Hot at all times
• I/p fuse block (right side of dash)
• Iat
• J101
• J114
• J117
• Nca
• O2 ssr fuse 14 15a
• P/train relay
• Pnk
• Pump relay
• Red
• Secondary air injection (air)
• Secondary air injection (air) pump (pzev) (lower left rear of engine)
• Tan
• Underhood fuse block (right front strut tower)
• W/o active brake control

3.8L VIN 2, Engine Performance Wiring Diagram (5 of 5) for Buick LaCrosse CX 2009

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (5 of 5) for Buick LaCrosse CX 2009:

• (clipped to knee bolster panel, right of data link connector) splice pack jx205
• (front of front passenger's door sill) g302
• (on left side of engine compt) a/c refrigerant pressure sensor
• 5 volt ref 1
• 5 volt ref 2
• A/c clutch relay
• A/c press sig
• A12
• A7 x2
• Acc
• Air conditioning system
• B11
• B12
• Battery
• C12
• Class 2
• Class 2 data
• Clstr fuse 10a
• Computer data lines system
• Cooling fans system
• Cruise control system
• Cruise sig
• D1 x1
• D10
• D12 x2
• Data link connector (left side of dash)
• E11
• Eng speed sig
• Evap vent sol
• F11
• Fuel level sig
• Fuel pump & sender assembly (in fuel tank)
• Fuel pump relay
• Fuel tank press
• Fuel tank pressure (ftp) sensor (in fuel tank)
• G202 (left side of dash)
• Gnd
• High fan
• Hot at all times
• Hot w/ ign 1 relay 37 energized
• I/p fuse block (right side of dash)
• Ign
• Ignition switch
• Ignition volt
• Instrument panel cluster (ipc)
• J211
• Lock
• Logic
• Low fan
• Low ref
• Malfunction indicator lamp (mil)
• Mil control
• Navigation system
• Pcm fuse 10a
• Pcm relay
• Pcm/etc fuse 16 15a
• Pnk
• Power distribution system
• Powertrain control module
• Relay ctrl
• Run
• Serial data bus
• Start
• Starter enable
• Starting/charging system
• Stop lamp sw
• Underhood fuse block (right front strut tower)
• Vehicle speed sig
• X1 d8

5.3L VIN C

5.3L VIN C, Engine Performance Wiring Diagram (1 of 5) for Buick LaCrosse CX 2009

List of elements for 5.3L VIN C, Engine Performance Wiring Diagram (1 of 5) for Buick LaCrosse CX 2009:

• (left rear of engine) g113
• 5 volt ref 2
• 5-volt ref 1
• Ckp sensor sig
• Cmp sensor sig
• Emissions 1 fuse 15a
• Engine control module (ecm) (left front of engine compt)
• Etc/ecm fuse 10a
• Fuel injector 1
• Fuel injector 2
• Fuel injector 3
• Fuel injector 4
• Fuel injector 5
• Fuel injector 6
• Fuel injector 7
• Fuel injector 8
• Ground
• Ho2s heater low
• Ho2s high signal
• Ho2s low signal
• Iat
• Iat sensor sig
• Ic 1 control
• Ic 2 control
• Ic 3 control
• Ic 4 control
• Ic 5 control
• Ic 6 control
• Ic 7 control
• Ic 8 control
• Ign 1 voltage
• Inj 1 fuse 20a
• Inj 2 fuse 20a
• J101
• Knock sensor (ks) 1
• Knock sensor (ks) 2 (lower right rear of engine)
• Knock sensor 1 signal
• Knock sensor 2 signal
• Low ref
• Maf sensor sig
• Mass air flow (maf)/ intake air temperature (iat) sensor (in air intake tube)
• Nca
• Oil pressure sw sig
• Red
• Tac motor control 1
• Tac motor control 2
• Tan
• Throttle actuator control (tac) module (top rear of engine)
• To pwr/trn relay (diagram 4 of 5)
• Tp sensor 1 sig
• Tp sensor 2 sig
• Underhood fuse block (right front strut tower)

5.3L VIN C, Engine Performance Wiring Diagram (2 of 5) for Buick LaCrosse CX 2009

List of elements for 5.3L VIN C, Engine Performance Wiring Diagram (2 of 5) for Buick LaCrosse CX 2009:

• (top left of engine)
• (top left side of engine) fuel injector
• (top of left valve cover)
• (top right of engine)
• (top right of engine) fuel injector
• Engine oil pressure (eop) sensor (top rear of engine)
• Fuel injector
• G112 (left rear of engine)
• Harness, approximately 5 cm from x107) j134
• Heated oxygen (ho2s) sensor 1 (right side of engine)
• Heated oxygen (ho2s) sensor 2 (downstream of catalytic converter)
• Ignition coil 1
• Ignition coil 3
• Ignition coil 5
• Ignition coil 7
• J106
• J108
• J109
• J130
• Nca
• Pnk
• Pnk d
• Red
• Red c
• Spark plug
• Tan
• Tan a

5.3L VIN C, Engine Performance Wiring Diagram (3 of 5) for Buick LaCrosse CX 2009

List of elements for 5.3L VIN C, Engine Performance Wiring Diagram (3 of 5) for Buick LaCrosse CX 2009:

• (front of right cylinder head) camshaft position (cmp) sensor
• (on left side of engine compt) a/c refrigerant pressure sensor
• (right rear of engine)
• (top of right valve cover)
• (top right rear of engine) evaporative emission (evap) canister purge solenoid valve
• (under left rear of vehicle) evaporative emissions (evap) canister vent solenoid valve
• 5 cm from x112) j135
• A/c refrigerant
• Cnstr fuse 10a
• Crankshaft position (ckp) sensor
• Cylinder shutoff 4
• Cylinder shutoff 7
• Ect sensor sig
• Engine control module (ecm) (left front of engine compt)
• G112 (left rear of engine)
• Hot at all times
• I/p fuse block (right side of dash)
• Ignition coil 2
• Ignition coil 4
• Ignition coil 6
• Ignition coil 8
• J105
• J131
• Lines system computer data
• Map sensor sig
• Nca
• Pnk
• Pnk d
• Red
• Red c
• Serial data bus (+)
• Spark plug
• System transmissions
• Underhood fuse block (right front strut tower)
• Vehicle speed sig

5.3L VIN C, Engine Performance Wiring Diagram (4 of 5) for Buick LaCrosse CX 2009

List of elements for 5.3L VIN C, Engine Performance Wiring Diagram (4 of 5) for Buick LaCrosse CX 2009:

• (diagram 1 of 5)
• (top rear of engine) valve lifter oil manifold (vlom) assembly
• 5 volt ref 1
• Acc
• Brakes system anti-lock
• Cooling fans system
• Cylinder shutoff 1
• Cylinder shutoff 6
• Delivered torque
• Ecm ign fuse 10a
• Ecm/ tcm fuse 15a
• Emiss- ions 2 fuse 15a
• Engine control module (ecm) (left front of engine compt)
• Engine coolant temperature (ect) sensor (left front of engine)
• Evap canister purge
• From etc/ecm fuse a
• Generator field
• Generator sig
• Hot at all times
• Hot w/ ignition main pcb relay energized
• Ignition switch
• Lines system computer data
• Lock
• Low ref
• Low speed cooling
• Manifold absolute pressure (map) sensor (top left rear of engine)
• Park/neutral sig
• Pnk
• Power distribution system
• Pwr/trn relay
• Red
• Requested torque
• Run
• Serial data bus (-)
• Shutoff cylinder solenoid 1, cylinder 1
• Shutoff cylinder solenoid 2, cylinder 4
• Shutoff cylinder solenoid 3, cylinder 6
• Shutoff cylinder solenoid 4, cylinder 7
• Start
• System charging starting/
• Tan
• Transmissions system
• Underhood fuse block (right front strut tower)

5.3L VIN C, Engine Performance Wiring Diagram (5 of 5) for Buick LaCrosse CX 2009

List of elements for 5.3L VIN C, Engine Performance Wiring Diagram (5 of 5) for Buick LaCrosse CX 2009:

• (front of front passenger's door sill) g302
• 5 volt ref 1
• 5 volt ref 2
• A/c compressor
• A12
• Acc voltage
• Accelerator pedal position (app) sensor (left side of dash)
• Air conditioning system cooling fans system
• Anti-lock brakes system
• App sensor 1 sig
• App sensor 2 sig
• B12
• Batt pos voltage
• Brake booster sig
• Brake booster vacuum sensor (on brake booster)
• C12
• Class 2
• Clstr fuse 10a
• Computer data lines system
• Cooling fan rly
• Cruise control sw
• Cruise control system
• D1 x1
• D12 x2
• Engine control module (ecm) (left front of engine compt)
• Engine speed sig
• Evap canister vent
• Exterior lights system
• Fuel level sens
• Fuel pump & sender assembly (in fuel tank)
• Fuel pump rly
• Fuel tank pressure (ftp) sensor (in fuel tank)
• Fuel tank sens
• Fuel/ pump fuse 15a
• Fuel/ pump relay
• G113 (left rear of engine)
• G202 (left side of dash)
• Gnd
• H6 x4
• Hot at all times
• I/p fuse block (right side of dash)
• Ign
• Ign 1 voltage
• Instrument panel cluster (ipc)
• J101
• J211
• Logic
• Low ref
• Low reference
• Mil control
• Mil ind
• Navigation system
• Pnk
• Powertrain rly
• Serial data
• Starter enable
• Starting/ charging system
• Stop lamp sw sig
• Tan
• Underhood fuse block (right front strut tower)
• Vehicle speed sig
• X1 h1
• X2 c6