ENGINE PERFORMANCE – Lexus SC 400 1999 – SYSTEM WIRING DIAGRAMS

ENGINE PERFORMANCE

4.0L

4.0L, Engine Performance Wiring Diagrams (1 of 4) for Lexus SC 400 1999

List of elements for 4.0L, Engine Performance Wiring Diagrams (1 of 4) for Lexus SC 400 1999:

• (dash harn, right side of dash)
• (eng harn, left side of engine)
• (engine harn, center of firewall)
• (engine harn, left rear of engine)
• (engine harn, left side of eng compt)
• (left cylinder head)
• (left cylinder head) g112
• (right cylinder head)
• Acis
• Braided
• Camshaft position sensor (left front of engine)
• Cl-
• Conn e15
• Conn e16
• Crankshaft position sensor (left front of engine)
• E01
• E02
• E03
• E26
• E27
• E27 (engine harn, right side of firewall)
• E28
• E29
• E30
• E31
• Engine control module (behind lower right side of dash)
• Evg
• G112
• G112 (left cylinder head)
• G120
• G120 (right cylinder head)
• Ge01
• Htl
• Htr
• I25
• I25 (dash harn, right side of dash)
• I29
• Igf1
• Igf2
• Ignition coil & igniter 1
• Ignition coil & igniter 2
• Ignition coil & igniter 3
• Ignition coil & igniter 4
• Ignition coil & igniter 5
• Ignition coil & igniter 6
• Ignition coil & igniter 7
• Ignition coil & igniter 8
• Igt1
• Igt2
• Igt3
• Igt4
• Igt5
• Igt6
• Igt7
• Igt8
• Instrument cluster system
• Knkl
• Knkr
• Knock sensor 1 (top center of engine)
• Knock sensor 2 (top center of engine)
• Left camshaft timing oil control valve (left front of engine)
• Left vvt sensor (top left side of engine)
• Mass airflow meter (in air intake duct)
• Me01
• Ne+
• Ne-
• Noise filter (left rear corner of engine)
• Ocv+
• Ocv-
• Oxl1
• Oxr1
• Pnk
• Prg
• Red
• Right vvt sensor (top right side of engine)
• Tha
• Throttle control motor (on throttle body)
• Thw
• Vpa
• Vpa2
• Vsv (acis) (top rear of engine)
• Vsv (evap) (top rear of engine)
• Vta
• Vta2
• Vvl+
• Vvl-
• Vvr+
• Vvr-

4.0L, Engine Performance Wiring Diagrams (2 of 4) for Lexus SC 400 1999

List of elements for 4.0L, Engine Performance Wiring Diagrams (2 of 4) for Lexus SC 400 1999:

• (dash harn, lower right end of dash) i21
• (dash harn, right side of dash)
• (engine harn, center of firewall)
• (engine harn, left fender apron) e8
• (engine harn, right side of firewall)
• (in fuel tank) fuel pump
• (left side of luggage compartment) fuel pump ecu
• Acc
• Accel position sensor (top center of engine)
• Am2
• Braided
• E26
• E26 (engine harn, right side of firewall)
• E27
• E28
• E29
• E29 (engine harn, left rear of engine)
• Efi fuse 30a
• Efi main relay
• Engine coolant temperature sensor (right front top of engine)
• Fpc
• G100 (front of left front fender)
• G112 (left cylinder head)
• G120 (right cylinder head)
• G308 (base of left "b" pillar)
• Heated oxygen sensor (bank 1 sensor 1) (on left side of engine, in exhaust manifold)
• Heated oxygen sensor (bank 2 sensor 1) (on right side of engine, in exhaust manifold)
• Hot at all times
• Htl
• Htr
• I25
• I27
• Ign fuse 7.5a
• Ignition switch
• Injector 1
• Injector 2
• Injector 3
• Injector 4
• Injector 5
• Injector 6
• Injector 7
• Injector 8
• Instrument cluster system
• Junction block 1
• Lock
• Oxl1
• Oxr1
• P/n
• Park/neutral position switch (on transmission)
• Pnk
• Red
• Relay block 2 (on left side of engine compt, behind battery)
• Short connector (right side of dash)
• St fuse 7.5a
• Start
• Starting/ charging system
• Throttle position sensor (on throttle body)
• Transmission control switch

4.0L, Engine Performance Wiring Diagrams (3 of 4) for Lexus SC 400 1999

List of elements for 4.0L, Engine Performance Wiring Diagrams (3 of 4) for Lexus SC 400 1999:

• (dash harn, lower right end of dash)
• (dash harn, right end of dash)
• (dash harn, right side of dash)
• (dash harn, top center of dash) i9
• (left kick panel)
• (under center console) shift lock ecu
• A/t indicator switch (integral to park/neutral position switch) (on transmission)
• Abs ecu (right side of dash)
• Braided
• C12
• C13
• C14
• C25
• Combination meter
• D13
• E12
• E18
• Electronically controlled transmission pattern select switch
• G120 (right cylinder head)
• G200
• Gauge fuse 10a
• H12
• Heated oxygen sensor (bank 1 sensor 2) (on exhaust system, near catalytic converter)
• Heated oxygen sensor (bank 2 sensor 2) (on exhaust system, near catalytic converter)
• Hot at all times
• Hot in on or start
• Htl2
• Htr2
• I10
• I17
• I20
• I21
• I26
• I27
• Junction block 1
• Junction block 1 (behind left kick panel)
• Junction block 3
• Junction block 3 (behind center of dash)
• Malfunction indicator light
• Obd fuse 7.5a
• Oxl2
• Oxr2
• Pnk
• Pwr
• Red
• Snow
• Stop fuse 15a
• Stoplight switch (on bracket, above brake pedal)
• Vapor pressure sensor (under right rear of vehicle, near wheelwell)

4.0L, Engine Performance Wiring Diagrams (4 of 4) for Lexus SC 400 1999

List of elements for 4.0L, Engine Performance Wiring Diagrams (4 of 4) for Lexus SC 400 1999:

• (2000)
• (behind left side of dash) data link connector 3
• (dash harn, top center of dash)
• (dash harn, upper right side of dash)
• (engine harn, left rear of engine)
• (engine harn, left side of eng compt)
• (left rear side of engine)
• (on transmission) o/d direct clutch speed sensor
• (under
• +b1
• +bm
• A/c
• Acmg
• Anti-lock brakes system
• Bat
• Batt
• Braid
• Ccs
• Ccv
• Cl+
• Code
• Conn e17
• Conn e18
• Conn e19
• Conn e20
• Cooling fan ecu
• Cruise control switch a/c control assy
• Cruise control system
• Data link connector 1
• Data link connector 2 (left side of dash)
• E18
• E28
• E29
• E32
• Electronically controlled transmission solenoid (in transmission)
• Els
• Eng+
• Eng-
• Engine control module (unused pins not shown) (behind lower right side of dash)
• Eom
• Etcs fuse 15a
• Fpc
• G112 (left cylinder head)
• G120 (right cylinder head)
• G200 (left kick panel)
• G206 (left instrument panel brace)
• G302 left ashtray)
• H13
• Hot at all times
• Htl2
• Htr2
• I20
• I25
• I26
• Idlo
• Igsw
• Imld
• Junction block 1
• Junction block 3
• Key unlock warning switch
• Ksw
• Mg clt relay
• Mrel
• Nco+
• Nco-
• Neo
• Ocr+
• Ocr-
• Oil
• Oxl2
• Oxr2
• Pnk
• Ptnk
• Pwr
• Pwrl
• Red
• Relay block 2
• Right camshaft timing oil control valve (top right front of engine)
• Rspd
• Rxck
• Sil
• Sln+
• Sln-
• Slt+
• Slt-
• Slu+
• Slu-
• Snwi
• Snwl
• Sp2+
• Sp2-
• Sta
• Sti-
• Stp
• Tach
• Tachometer
• Tail fuse
• Theft deterent indicator
• Tpc
• Transponder key amplifier (behind left side of dash)
• Trc+
• Trc-
• Txct
• Vehicle speed sensor (on transmission)
• Vsv (canister closed valve) (on right side of engine compt)
• Vsv (pressure switching valve) (under right rear of vehicle)