ENGINE PERFORMANCE – Buick Century Limited 2004 – SYSTEM WIRING DIAGRAMS

ENGINE PERFORMANCE

3.1L VIN J

3.1L VIN J, Engine Performance Wiring Diagram (1 of 4) for Buick Century Limited 2004

List of elements for 3.1L VIN J, Engine Performance Wiring Diagram (1 of 4) for Buick Century Limited 2004:

• (on transaxle stud)
• (pin 14-15 not used)
• (pin 2-3 not used)
• (pin 23-27 not used)
• (pin 34-37 not used)
• (pin 39-42 not used)
• (pin 49-52 not used)
• (pin 66-67 not used)
• (under left side of dash, right of steer column) data link connector
• 1-2 ss valve control
• 2-3 ss valve control
• A/c press return
• A/t iss hi sig
• A/t iss low sig
• Bank 1 ks signal
• Camshaft position sensor (cmp) (front of eng, below intake plenum)
• Ckp sensor a
• Cmp signal
• Cooling fan system
• Crankshaft position (ckp) sensor b (right side of engine, below manifold)
• Crankshaft position sensor a (front of eng, behind harmonic balancer)
• Cruise control system
• Cruise disable output
• Ecm fuse 22 10a
• Egr val ign pos volt
• Elek ign fuse 25 15a
• Eng emis fuse 30 10a
• Eng spd sig
• Evap can purge control
• F/injr fuse 28 15a
• Fuel inj 1 control
• Fuel inj 2 control
• Fuel inj 3 control
• Fuel inj 5 control
• Fuel inj 6 control
• G111 (on transaxle stud, left of starter)
• G113
• High speed fans control
• Ho2s 1 sig low
• Ho2s 2 sig low
• Hot at all times
• Hot in off, run or start
• Hot in run or start
• I/p fuse block (behind right side of dash, in right door opening)
• Iac valve b high
• Iat sensor ground
• Ic control
• Ign 0 fuse 10a
• Ignition amplifier and switching module
• Ignition control module (top right side of eng)
• Ignition power
• Knock sensor (ks) bank 1 (left side lower eng, above starter)
• Low ref
• Low speed fans control
• Maf sensor signal
• Map sensor
• Map/ect sensor ref
• Pcm ground
• Pnk
• Pnk b
• Power (battery)
• Powertrain control module (pcm) (left front side of eng compt, in air cleaner assembly)
• Red
• Ref low
• S106
• S270
• Sensor ground
• Sensor return
• Serial data (class 2)
• Spark plugs
• Splice pack sp205
• Tan
• Tcc brake switch input
• Tp sensor ref
• Tr switch input b
• Underhood fuse block (mounted to right strut tower)
• Vss high
• Vss low
• Vss output

3.1L VIN J, Engine Performance Wiring Diagram (2 of 4) for Buick Century Limited 2004

List of elements for 3.1L VIN J, Engine Performance Wiring Diagram (2 of 4) for Buick Century Limited 2004:

• Automatic transmission
• Automatic transmission fluid pressure manual valve position switch
• Evaporative emissions (evap) canister purge solenoid (top right side of eng, behind ignition control module)
• Evaporative emissions (evap) canister vent solenoid (behind left side of rear fascia splash shield, in wheelwell)
• Fuel injectors
• G113 (on transaxle stud)
• Iss sensor
• Pnk
• Pressure control solenoid valve
• S106
• S109
• Stoplight switch (on brake pedal support bracket)
• Tan
• Transmission internal mode switch
• Vehicle speed sensor (lower right side of eng compt, on transaxle)

3.1L VIN J, Engine Performance Wiring Diagram (3 of 4) for Buick Century Limited 2004

List of elements for 3.1L VIN J, Engine Performance Wiring Diagram (3 of 4) for Buick Century Limited 2004:

• (body harn, under rear seat)
• (engine harn, 4 cm from pcm breakout)
• (fuel inj harn, 2 cm from fuel inj 3 breakout)
• (left side of eng, in air cleaner duct) mass airflow (maf) sensor
• (lower left side of eng, above starter) engine oil pressure indicator switch
• (on throttle body assembly) idle air control (iac) valve
• (optional) (on bottom of eingine oil pan) engine oil level indicator switch
• A/c refrigerant pressure sensor (on left side of eng compt, on accumulator)
• B12
• Engine coolant temperature (ect) sensor (top left side of eng, below throttle body)
• Exhaust gas recirculation (egr) valve (top rear of eng, near throttle body)
• Fuel tank pressure sensor (in fuel tank)
• G113 (on transaxle stud)
• Generator
• Instrument cluster
• Intake air temperature (iat) sensor (left rear of eng compt, in air cleaner duct)
• L b
• Malfunction indicator lamp
• Manifold absolute pressure (map) sensor (top right side of eng, above valve cover)
• Pnk
• Red
• S106
• S121
• S167
• S409
• Tan
• Throttle position (tp) sensor (on throttle body assembly)
• Underhood fuse block c1 (mounted to right strut tower)

3.1L VIN J, Engine Performance Wiring Diagram (4 of 4) for Buick Century Limited 2004

List of elements for 3.1L VIN J, Engine Performance Wiring Diagram (4 of 4) for Buick Century Limited 2004:

• (behind right side of dash, in right door opening)
• (not used)
• (on transaxle stud)
• (pin 12-15 not used)
• (pin 31-32 not used)
• (pin 40-41 not used)
• (pin 47-48 not used)
• (pin 51-54 not used)
• (pin 64-65 not used)
• (pin 8-9 not used)
• (right side of rear shelf)
• 1-2 shift sol
• 2-3 shift sol
• 5 volt ref
• 5v ref a
• A/c compress clutch rly
• A/c refrig press signal
• A/c request signal
• A11
• Air conditioning system
• Air pmp relay
• Automatic transmission
• Ckp sens
• Ckp sens return
• Cluster fuse 10a
• Cmp/ckp sensor batt (+)
• Cmp/ckp sensor ground
• Crank
• Crank signal fuse 10a
• Cruise control system
• Cruise status
• D10
• Ect sensor signal
• Egr pintle position signal
• Egr val control
• Eng oil level ind in
• Eng oil press switch in
• Evap can vent sol control
• F/pmp fuse 35 15a
• F/pump relay
• Fluid temp sensor
• Fuel inj 4 control
• Fuel level sensor
• Fuel level sensor input
• Fuel pump
• Fuel pump prime con- nec- tor
• Fuel pump relay control
• Fuel tank
• Fuel tank press signal
• G113
• G113 (on transaxle stud)
• G402
• Gen terminal l output
• Heated oxygen sensor 1 (ho2s 1) (in right side exhaust manifold)
• Heated oxygen sensor 2 (ho2s 2) (in exhaust system, rear of catalytic converter)
• Ho2s 1 signal
• Ho2s 2 signal
• Ho2s htr lo ctrl
• Hot at all times
• Hot in run or start
• Hot in start
• I/p fuse block
• Iac coil a high
• Iac coil a low
• Iac coil b low
• Iat sensor signal
• Ignition positive volt
• Low ref
• Map sensor signal
• Mil control
• Nca
• Oxy sen fuse 29 15a
• Pc sol hi
• Pc sol lo
• Pcm- bcm fuse 10a
• Pnk
• Powertrain control module (pcm) (left front side of eng compt, in air cleaner assembly)
• Red
• S105
• S106
• S115
• S234
• Sensor ground
• Starter enable control
• Starting/ charging system
• Tan
• Tcc pwm sol val control
• Tcc rel sw sig
• Tcc sol valve
• Tft sensor signal
• Tp sensor signal
• Tps 5 volt ref
• Tr switch input a
• Tr switch input c
• Tr switch input p
• Trans fuse 26 10a
• Underhood fuse block (mounted to right strut tower)