ENGINE PERFORMANCE — Buick Lucerne CX 2007 — SYSTEM WIRING DIAGRAMS

ENGINE PERFORMANCE

3.8L VIN 2

3.8L VIN 2, Engine Performance Wiring Diagram (1 of 5) for Buick Lucerne CX 2007

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (1 of 5) for Buick Lucerne CX 2007:

• signal ground
• (1 in) from branch for c139)
• (in engine harness, approximately 3 cm
• (left side of oil pan)
• (lower left rear of engine)
• (on left side of engine, near starter)
• (on top front of engine)
• (on top right rear of engine)
• (pins 62-72 not used)
• 5 volt ref 1
• 5 volt ref 2
• Camshaft sig
• Ect sensor sig
• Egr pos sig
• Egr sol high
• Egr sol low
• Engine coolant temperature sensor (left rear of engine)
• Engine oil level switch
• Engine oil pressure switch
• Evap purge sol
• Evaporative emission (evap) canister purge solenoid valve (on top right rear of engine)
• Exhaust gas recirculation valve
• Fuel inj 1 ctrl
• Fuel inj 2 ctrl
• Fuel inj 3 ctrl
• Fuel inj 4 ctrl
• Fuel inj 5 ctrl
• Fuel inj 6 ctrl
• Fuel injectors (1, 3 & 5: top left side of engine) (2, 4 & 6: top right side of engine)
• G112
• G112 (lower left rear of engine)
• Gen field
• Gen on sig
• Heated oxygen sensor (ho2s) 1 (on right exhaust manifold)
• Ho2s heater 1
• Ho2s low ref
• Ho2s ref volt
• Ic timing ctrl
• Ic timing sig
• Knock sensor 1
• Knock sensor 2
• Knock sensor 2 (on right side of engine, below exhaust manifold)
• Low eng speed
• Low ref
• Manifold absolute pressure sensor
• Map sensor sig
• Med eng speed
• Nca
• Oil level sw
• Oil press sig
• Pnk
• Powertrain control module (left front of engine compt, inside air cleaner housing)
• Relay control
• S109
• Starting/charging system
• Tan
• Tan/pnk
• Uart data

3.8L VIN 2, Engine Performance Wiring Diagram (2 of 5) for Buick Lucerne CX 2007

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (2 of 5) for Buick Lucerne CX 2007:

• (lower left rear of engine)
• (not used)
• (on left front of engine, next to crankshaft balancer) crankshaft position sensor
• (on right front of engine)
• 12-volt ref
• 5 volt ref
• Aap sensor 1
• Accelerator pedal position sensor (top of accelerator pedal assembly)
• App sensor 2
• Body control module (right of glove box)
• C110
• Camshaft position sensor
• Ckp sen 1 sig
• Ckp sen 2 sig
• Cmp sens sig
• Cmp sig
• Firing order 1-6-5-4-3-2
• G112
• G115 (lower left rear of engine)
• Gnd
• Ground
• Hall effect sensor
• Hot in run or start
• Ic timing ctrl
• Ic timing sig
• Ign 1 volt
• Ignition coils
• Ignition control module (icm) (at left front of engine, under ignition coils)
• Inj/coil fuse f24 15a
• Inj/coil fuse f25 15a
• Low ref
• Low speed sig
• Medium speed sig
• P pnk
• Pnk
• Primary uart
• S145
• S164
• Sec uart
• Spark plugs
• Stop lamp
• Stop lamp switch signal
• Throttle actuator control module (on throttle body assembly)
• Trans ign 3 fuse f6 10a
• Underhood fuse block (on right front of engine compt, forward of strut tower)
• Vehicle spd
• Volt ign 1

3.8L VIN 2, Engine Performance Wiring Diagram (3 of 5) for Buick Lucerne CX 2007

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (3 of 5) for Buick Lucerne CX 2007:

• (not used)
• 1-2 shift solenoid valve
• 2-3 shift solenoid valve
• A red
• A/t fluid temperature sensor valve
• A/t input shaft speed sensor
• At iss low sig
• Automatic transmission
• Automatic transmission fluid pressure (tfp) manual valve position switch
• Code a
• Code b
• Code c
• G112 (lower left rear of engine)
• Ho2s 2 sig high
• Ho2s 2 sig low
• Ho2s heater 2
• Iat sensor sig
• Interlock system
• Lockout
• Lockout sol ctrl
• Low ref
• Maf sensor sig
• P/n
• Parity
• Pc sol hi ctrl
• Pnk
• Powertrain control module (left front of engine compt, inside air cleaner housing)
• Pre sen sig
• Pressure control solenoid valve
• Red
• S115 (approximately 59 cm (24 in) from left front wheel speed sensor) red
• Shift
• Shift sol
• Sol low ctrl
• Tan
• Tan/pnk
• Tcc release switch
• Tcc sol
• Tcc sw sig
• Tft sensor sig
• Torque converter clutch solenoid valve
• Tr sig a
• Tr sig b
• Tr sig c
• Tr sig p
• Transmission internal mode switch
• Vehicle speed sensor (in transmission)
• Vss sig high
• Vss sig low

3.8L VIN 2, Engine Performance Wiring Diagram (4 of 5) for Buick Lucerne CX 2007

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (4 of 5) for Buick Lucerne CX 2007:

• (lower left rear of engine) g112
• (lower left rear of engine) g114
• (under vehicle, after catalytic converter)
• Air pump fuse jc8 50a
• Air pump relay r9
• Air temperature sensor (left side of engine
• Air/ sol relay r12
• Air/sol fuse f27 15a
• Compartment, in air intake tube)
• Crnk relay r3
• Ecm ign 3 fuse f5 10a
• Ecm/crnk fuse f23 15a
• G112 (lower left rear of engine)
• Gnd
• Heated oxygen sensor (ho2s) 2
• Hot at all times
• Hot in run & start
• Hot in run or start
• Iat sens sig
• Low ref
• Mass air flow/intake
• Nca
• Oxy pst fuse f21 15a
• Pnk
• Pwr trn fuse f22 15a
• Pwr/train relay r4
• Red
• Relay r6
• Rly ctrl
• Run/ crank
• S101
• S108
• Secondary air injection (air) check valve (w/ california pzev emission system)
• Secondary air injection (air) pump (w/ california pzev emission system)
• Sens sig maf
• Tan
• Tan d
• Tan/pnk
• Underhood fuse block (on right front of engine compt, forward of strut tower)

3.8L VIN 2, Engine Performance Wiring Diagram (5 of 5) for Buick Lucerne CX 2007

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (5 of 5) for Buick Lucerne CX 2007:

• (approximately 5 cm (2 in) from breakout for electronic suspension control module) s316
• (below rear of vehicle, on evap canister)
• (right front wall of luggage compartment) g403
• (under left rear seat)
• 5 volt ref 1
• A/c clutch relay
• A/c press sig
• A/c refrigerant pressure sensor (near a/c compressor, on hose assembly)
• Acc
• Air conditioning system
• Battery
• Body control module (right of glove box)
• Cnstr vent fuse f5 10a
• Computer data lines system
• Cooling fans system
• Ecm/tcm fuse f28 15a
• Evap vent sol
• Evaporative emissions (evap) canister vent solenoid valve
• Fuel level sig
• Fuel pump & sender assembly
• Fuel pump relay
• Fuel tank press
• Fuel tank pressure sensor
• Fuel/ pump relay r7
• G300 (under driver's seat)
• G301
• Gnd
• High fan
• Hot at all times
• Ign
• Ignition 1
• Ignition switch
• Instrument panel cluster
• Logic
• Low fan
• Low ref
• Malfunction indicator lamp (mil)
• Mil control
• Off
• Pnk
• Powertrain control module (left front of engine compt, inside air cleaner housing)
• Rear fuse block (below left side
• Relay control
• Relay ctrl
• Run
• S201
• S203
• Ser data bus +
• Ser data bus -
• Side of rear seat)
• Start
• Starter enable
• Starting/charging system
• Stop lamp sw
• Tan
• Vehicle speed sig
• Wakeup data

4.6L VIN Y

4.6L VIN Y, Engine Performance Wiring Diagram (1 of 5) for Buick Lucerne CX 2007

List of elements for 4.6L VIN Y, Engine Performance Wiring Diagram (1 of 5) for Buick Lucerne CX 2007:

• (left rear of engine compartment) transmission control module (tcm)
• (lower left rear of engine) g112
• (right of glove box) body control module (bcm)
• (under driver's seat) g300
• 5v ref 1
• 5v ref 2
• A/c com clutch rly
• Accelerator pedal position (app) sensor (top of accelerator pedal assembly)
• Accessory wake up
• Air conditioning system
• App sensor 1 sig
• App sensor 2 sig
• Battery pos volt
• Cooling fans system
• Ecm ign 3 fuse f5 10a
• Ecm/crnk fuse f23 15a
• Engine control module (ecm) (left side of engine compartment)
• Engine oil pressure (eop) switch (near oil filter)
• Evap canister vent
• Exterior lights system
• Fan relay ctrl
• Fuel pump rly ctrl
• Fuel tank pressure (ftp) sensor (on top of fuel tank)
• G112 (lower left rear of engine)
• Gnd
• Hot at all times
• Hot in run or start
• Ign
• Ignition 1 voltage
• Instrument panel cluster (ipc)
• Logic
• Low reference
• Malfunction indicator lamp (mil)
• Mil control
• Oss hi sig
• Oss low sig
• Oxy pst fuse f21 10a
• Pnk
• Pressure sns sig
• Primary fuel level
• Pwr/train relay
• Pwr/train relay r4
• Rly ctrl
• Run/crnk relay r6
• S104 (approximately 13 cm (5 in) from breakout to c138)
• S105
• S203
• Serial data acc wake up
• Starter rly coil
• Starting/ charging system
• Stop lamp sw sig
• Tan
• To fuse pwr trn fuse f22 (diagram 4 of 5)
• Underhood fuse block (on right front of engine compartment, forward of strut tower)
• Vehicle speed sensor (vss) (in transmission)

4.6L VIN Y, Engine Performance Wiring Diagram (2 of 5) for Buick Lucerne CX 2007

List of elements for 4.6L VIN Y, Engine Performance Wiring Diagram (2 of 5) for Buick Lucerne CX 2007:

• (below rear of vehicle, on evap canister) evaporative emission (evap) canister vent solenoid valve
• (near a/c compressor, on hose assembly)
• (top of fuel tank) fuel pump & sender assembly
• (under left rear seat)
• 5v ref 1
• 5v ref 2
• A/c refrigerant pressure sensor
• Acc
• Air pump relay ctrl
• Cnstr vent fuse f5 10a
• Cooling fans system
• Ctrl bank 2 sns 1
• Ecm/tcm fuse f28 15a
• Engine control module (ecm) (left side of engine compartment)
• Evap canister purge
• Field duty cycle sig
• Fuel pump fuse f11 20a
• Fuel/ pump relay r7
• G301
• G403 (right front wall of luggage compartment)
• Hot at all times
• Ignition switch
• Low reference
• Low speed cooling
• Off
• Park/neutral
• Pnk
• Rear fuse block (below left side of rear seat)
• Ref bank 2 sns 1
• Reverse lockout sol
• Run
• S100
• S201
• S316 (in body harness, approximately 5 cm (2 in) from breakout for electronic suspension control module)
• Serial data bus -
• Start
• Starting/ charging system
• Tan
• Transmissions system
• Turn on signal
• Volt bank 2 sns 1

4.6L VIN Y, Engine Performance Wiring Diagram (3 of 5) for Buick Lucerne CX 2007

List of elements for 4.6L VIN Y, Engine Performance Wiring Diagram (3 of 5) for Buick Lucerne CX 2007:

• (lower left front corner of engine compartment) secondary air injection (air) pump
• (lower left rear of engine)
• (on top right rear of engine) evaporative emission (evap) canister purge solenoid valve
• (top center of rear camshaft cover) secondary air injection (air) check valve
• Air pump fuse jc8 50a
• Air pump relay r9
• Air/ sol relay r12
• Air/sol fuse f27 15a
• Computer data lines system
• Ect sensor sig
• Engine control module (ecm) (left side of engine compartment)
• Engine coolant temperature (ect) sensor (right rear of engine)
• G115
• Heated oxygen sensor (ho2s) bank 2 sensor 1 (in left exhaust manifold)
• Hot at all times
• Hot in run or start
• Manifold absolute pressure (map) sensor (on top rear of engine)
• Map sensor sig
• Nca
• Oil pre sw signal
• Pnk
• Pre sns sig
• Refrig pre sen sig
• S106
• Serial data bus +
• Tan
• Underhood fuse block (on right front of engine compartment, forward of strut tower)

4.6L VIN Y, Engine Performance Wiring Diagram (4 of 5) for Buick Lucerne CX 2007

List of elements for 4.6L VIN Y, Engine Performance Wiring Diagram (4 of 5) for Buick Lucerne CX 2007:

• (below exhaust gas recirculation
• (egr) valve)
• (in engine harness,
• (in engine harness, approximately 3 cm (1 in) from branch for c139) s109
• (in engine harness, approximately 7 cm (4 in) from branch for c139 toward breakout for c138) s102
• (in even bank ignition coil harness, between c139 & ignition coil/module 8) s135
• (in even bank ignition coil harness, pnk
• (in odd bank ignition coil harness, between c140 & ignition coil/module 7) s142
• (in odd bank ignition coil harness, between c140 & ignition tan
• (on right front of engine compartment, forward of strut tower)
• (on top right rear of engine) exhaust gas recirculation (egr) valve
• (top left side of engine)
• (top right side of engine)
• Approximately 6 cm (2 in) from branch for engine coolant temperature (ect) sensor)
• Between c139 & ignition coil/module 8) s131
• Coil/module 7) s146
• Ctrl
• From ecm/crnk fuse f23 (diagram 1 of 5)
• Fuel injectors (top left side of engine)
• Fuel injectors (top right side of engine)
• G100
• Gnd
• Ign
• Ignition coil/module 1
• Ignition coil/module 2
• Ignition coil/module 3
• Ignition coil/module 4
• Ignition coil/module 5
• Ignition coil/module 6
• Ignition coil/module 7
• Ignition coil/module 8
• Inj/coil fuse f24 15a c3
• Inj/coil fuse f25 15a
• Low
• Nca
• Plug spark
• Pnk
• Pnk/tan
• Pwr trn fuse f22 15a
• Red
• Red b
• S110
• S133
• S144
• Spark plug
• Tan
• Tan c
• Underhood fuse block

4.6L VIN Y, Engine Performance Wiring Diagram (5 of 5) for Buick Lucerne CX 2007

List of elements for 4.6L VIN Y, Engine Performance Wiring Diagram (5 of 5) for Buick Lucerne CX 2007:

• (left side of engine compartment, in air intake tube)
• 5v ref 1
• 5v ref 2
• Camshaft position (cmp) sensor (on right front of engine)
• Ckp sensor sig
• Cmp sensor sig
• Crankshaft position (ckp) sensor (top center of engine)
• Egr sol high ctrl
• Egr sol low ctrl
• Egr valve pos sig
• Engine control module (ecm) (left side of engine compartment)
• Fuel injector 1
• Fuel injector 2
• Fuel injector 3
• Fuel injector 4
• Fuel injector 5
• Fuel injector 6
• Fuel injector 7
• Fuel injector 8
• G112 (lower left rear of engine)
• Heated oxygen sensor (ho2s) 2 (in exhaust, after catalytic converter)
• Heated oxygen sensor (ho2s) bank 1 sensor 1 (on right exhaust manifold)
• Heater low ctrl
• Ho2s 2 high sig
• Ho2s 2 low sig
• Iat sensor sig
• Ic 1 control
• Ic 2 ctrl
• Ic 3 control
• Ic 4 control
• Ic 5 ctrl
• Ic 6 ctrl
• Ic 7 ctrl
• Ic 8 control
• Ignition 1 voltage
• Knock sensor (ks) 1 (top right side of engine)
• Knock sensor (ks) 2 (top left side of engine)
• Knock sns 1 sig
• Knock sns 2 sig
• Low ref
• Low reference
• Maf sensor sig
• Mass air flow (maf)/ intake air temperature (iat) sensor
• Nca
• Pnk
• Pnk/red
• Pnk/tan
• Ref bank 1 sen 1
• S105
• Signal ground
• Tac motor ctrl 1
• Tac motor ctrl 2
• Tan
• Tan/pnk
• Throttle body assembly
• Tp sensor 1 sig
• Tp sensor 2 sig
• Volt bank 1 sns 1