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RSX Type-S 2002-04 (K20A2) → Link G4X XtremeX 109-4000 (auto)

RSX Type-S 2002-04 (K20A2) — Link — G4X XtremeX
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-08

Before you start

Statusdraft · not yet verified: nobody has reported building and running this harness
Open errorsnone
Size of the job62 wires · 9 connectors · 4 part lines
Tools715131-1 · wire strippers · multimeter · heat gun + heat-shrink
Terminals316836-1
Order of work1. Check every part against the parts list. 2. Cut and label every wire (labels: Export → Wire labels). 3. Crimp and pin connector by connector, ticking the build checklist. 4. Run the bench test with nothing plugged in and the battery disconnected. 5. Only then connect the ECU and power up.

Build checklist

Tick each box as you go. Continuity: meter from end to end, expect under 1 Ω.

WireFromToGaugeColourCutLabelCrimp ACrimp BPin APin BContinuity
W1OEM-A-2SP-14V-10.85☐☐☐☐☐☐☐
W2OEM-A-3SP-14V-10.85☐☐☐☐☐☐☐
W3SP-14V-1G4XXTREMEX-A-A50.85☐☐☐☐☐☐☐
W4SP-14V-1G4XXTREMEX-B-B50.85☐☐☐☐☐☐☐
W5OEM-A-23SP-GND-10.85☐☐☐☐☐☐☐
W6OEM-A-24SP-GND-10.85☐☐☐☐☐☐☐
W7OEM-A-4SP-GND-10.85☐☐☐☐☐☐☐
W8OEM-A-5SP-GND-10.85☐☐☐☐☐☐☐
W9OEM-E-3SP-GND-10.85☐☐☐☐☐☐☐
W10SP-GND-1G4XXTREMEX-A-A250.85☐☐☐☐☐☐☐
W11SP-GND-1G4XXTREMEX-A-A340.85☐☐☐☐☐☐☐
W12SP-GND-1G4XXTREMEX-B-B250.85☐☐☐☐☐☐☐
W13SP-GND-1G4XXTREMEX-B-B340.85☐☐☐☐☐☐☐
W14OEM-A-10SP-0V-10.5☐☐☐☐☐☐☐
W15OEM-A-11SP-0V-10.5☐☐☐☐☐☐☐
W16OEM-E-4SP-0V-10.5☐☐☐☐☐☐☐
W17SP-0V-1G4XXTREMEX-A-A240.5☐☐☐☐☐☐☐
W18SP-0V-1G4XXTREMEX-B-B220.5☐☐☐☐☐☐☐
W19OEM-A-20SP-5V1-10.5☐☐☐☐☐☐☐
W20OEM-A-21SP-5V1-10.5☐☐☐☐☐☐☐
W21OEM-E-5SP-5V1-10.5☐☐☐☐☐☐☐
W22SP-5V1-1G4XXTREMEX-A-A320.5☐☐☐☐☐☐☐
W23OEM-A-7G4XXTREMEX-A-A80.5☐☐☐☐☐☐☐
W24OEM-A-25G4XXTREMEX-A-A90.5☐☐☐☐☐☐☐
W25OEM-A-26G4XXTREMEX-A-A300.5☐☐☐☐☐☐☐
W26OEM-A-9G4XXTREMEX-B-B90.5☐☐☐☐☐☐☐
W27OEM-A-30G4XXTREMEX-A-A130.5☐☐☐☐☐☐☐
W28OEM-A-29G4XXTREMEX-A-A120.5☐☐☐☐☐☐☐
W29OEM-A-28G4XXTREMEX-A-A110.5☐☐☐☐☐☐☐
W30OEM-A-27G4XXTREMEX-A-A100.5☐☐☐☐☐☐☐
W31OEM-B-5G4XXTREMEX-A-A40.5☐☐☐☐☐☐☐
W32OEM-B-4G4XXTREMEX-A-A30.5☐☐☐☐☐☐☐
W33OEM-B-3G4XXTREMEX-A-A20.5☐☐☐☐☐☐☐
W34OEM-B-2G4XXTREMEX-A-A10.5☐☐☐☐☐☐☐
W35OEM-E-7G4XXTREMEX-A-A210.5☐☐☐☐☐☐☐
W36OEM-B-6G4XXTREMEX-A-A200.5☐☐☐☐☐☐☐
W37OEM-E-1G4XXTREMEX-A-A190.5☐☐☐☐☐☐☐
W38OEM-E-18G4XXTREMEX-A-A180.5☐☐☐☐☐☐☐
W39OEM-E-8G4XXTREMEX-A-A290.5☐☐☐☐☐☐☐
W40OEM-E-6G4XXTREMEX-A-A280.5☐☐☐☐☐☐☐
W41OEM-A-1G4XXTREMEX-A-A270.5☐☐☐☐☐☐☐
W42OEM-A-12G4XXTREMEX-A-A260.5☐☐☐☐☐☐☐
W43OEM-B-15G4XXTREMEX-B-B40.5☐☐☐☐☐☐☐
W44OEM-B-1G4XXTREMEX-B-B30.5☐☐☐☐☐☐☐
W45OEM-B-18G4XXTREMEX-B-B20.5☐☐☐☐☐☐☐
W46OEM-B-21G4XXTREMEX-B-B10.5☐☐☐☐☐☐☐
W47OEM-B-23G4XXTREMEX-B-B180.5☐☐☐☐☐☐☐
W48OEM-B-7G4XXTREMEX-B-B260.5☐☐☐☐☐☐☐
W49OEM-A-19G4XXTREMEX-A-A170.5☐☐☐☐☐☐☐
W50OEM-A-15G4XXTREMEX-A-A220.5☐☐☐☐☐☐☐
W51OEM-E-2G4XXTREMEX-A-A330.5☐☐☐☐☐☐☐
W52OEM-B-8G4XXTREMEX-A-A150.5☐☐☐☐☐☐☐
W53OEM-B-17G4XXTREMEX-A-A160.5☐☐☐☐☐☐☐
W54OEM-B-13G4XXTREMEX-A-A140.5☐☐☐☐☐☐☐
W55OEM-E-14G4XXTREMEX-B-B330.5☐☐☐☐☐☐☐
W56OEM-E-15G4XXTREMEX-B-B150.5☐☐☐☐☐☐☐
W57OEM-A-18G4XXTREMEX-A-A310.5☐☐☐☐☐☐☐
W58OEM-B-10G4XXTREMEX-A-A230.5☐☐☐☐☐☐☐
W59OEM-B-9G4XXTREMEX-B-B210.5☐☐☐☐☐☐☐
W60OEM-E-16G4XXTREMEX-B-B200.5☐☐☐☐☐☐☐
W61OEM-E-20G4XXTREMEX-B-B190.5☐☐☐☐☐☐☐
W62OEM-E-22G4XXTREMEX-B-B300.5☐☐☐☐☐☐☐

Bench test (before first power-up)

Battery disconnected, ECU and every sensor unplugged. Meter on resistance. Each pair below must read open (OL): a reading means a pinched wire, a stray strand or a mis-pinned cavity. Then check continuity of every wire (last column of the build checklist).

#Probe AProbe BExpectWhyReading
1G4XXTREMEX-A-A5G4XXTREMEX-A-A24open (OL)+12 V supply must not touch sensor ground
2G4XXTREMEX-A-A5G4XXTREMEX-A-A25open (OL)+12 V supply must not touch power ground
3G4XXTREMEX-A-A24G4XXTREMEX-A-A32open (OL)sensor ground must not touch 5 V sensor reference
4G4XXTREMEX-A-A25G4XXTREMEX-A-A32open (OL)power ground must not touch 5 V sensor reference
5G4XXTREMEX-A-A5G4XXTREMEX-A-A32open (OL)+12 V supply must not touch 5 V sensor reference

Revisions

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Schematic

G4XXTREMEX-AG4XXTREMEX-BOEM-AOEM-BOEM-ESP-0VSP-14VSP-5V1SP-GND

Connectors

G4XXTREMEX-A

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
A1Injector 4—W34—0.5OEM-B-2———
A10Ignition 4—W30—0.5OEM-A-27———
A11Ignition 3—W29—0.5OEM-A-28———
A12Ignition 2—W28—0.5OEM-A-29———
A13Ignition 1—W27—0.5OEM-A-30———
A14Analog Volt 4—W54—0.5OEM-B-13———
A15Analog Temp 1—W52—0.5OEM-B-8———
A16Analog Temp 2—W53—0.5OEM-B-17———
A17Analog Volt 1—W49—0.5OEM-A-19———
A18Aux 4—W38—0.5OEM-E-18———
A19Aux 3—W37—0.5OEM-E-1———
A2Injector 3—W33—0.5OEM-B-3———
A20Aux 2—W36—0.5OEM-B-6———
A21Aux 1—W35—0.5OEM-E-7———
A22Analog Volt 2—W50—0.5OEM-A-15———
A23Digital Input 3—W58—0.5OEM-B-10———
A24Sensor Ground—W17—0.5SP-0V-1———
A25System Ground—W10—0.85SP-GND-1———
A26Aux 8—W42—0.5OEM-A-12———
A27Aux 7—W41—0.5OEM-A-1———
A28Aux 6—W40—0.5OEM-E-6———
A29Aux 5—W39—0.5OEM-E-8———
A3Injector 2—W32—0.5OEM-B-4———
A30Digital Input 1—W25—0.5OEM-A-26———
A31Digital Input 2—W57—0.5OEM-A-18———
A32+5V Out—W22—0.5SP-5V1-1———
A33Analog Volt 3—W51—0.5OEM-E-2———
A34System Ground—W11—0.85SP-GND-1———
A4Injector 1—W31—0.5OEM-B-5———
A5+14V ECU Power—W3—0.85SP-14V-1———
A6+8V Out————————
A7Shield Ground————————
A8Trigger 1—W23—0.5OEM-A-7———
A9Trigger 2—W24—0.5OEM-A-25———

G4XXTREMEX-B

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
B1Injector 8—W46—0.5OEM-B-21———
B10Ignition 8————————
B11Ignition 7————————
B12Ignition 6————————
B13Ignition 5————————
B15Analog Volt 6—W56—0.5OEM-E-15———
B16Analog Volt 7————————
B17Shield Ground————————
B18Aux 9—W47—0.5OEM-B-23———
B19Digital Input 6—W61—0.5OEM-E-20———
B2Injector 7—W45—0.5OEM-B-18———
B20Digital Input 5—W60—0.5OEM-E-16———
B21Digital Input 4—W59—0.5OEM-B-9———
B22Sensor Ground—W18—0.5SP-0V-1———
B23Analog Volt 8————————
B24Analog Volt 9————————
B25System Ground—W12—0.85SP-GND-1———
B26Aux 10—W48—0.5OEM-B-7———
B27CAN 2 H————————
B28CAN 2 L————————
B29Digital Input 8————————
B3Injector 6—W44—0.5OEM-B-1———
B30Digital Input 7—W62—0.5OEM-E-22———
B31Analog Volt 10————————
B32Analog Volt 11————————
B33Analog Volt 5—W55—0.5OEM-E-14———
B34System Ground—W13—0.85SP-GND-1———
B4Injector 5—W43—0.5OEM-B-15———
B5Aux 9/10 E-Throttle Supply—W4—0.85SP-14V-1———
B6Analog Temp 3————————
B7Analog Temp 4————————
B8Knock 2————————
B9Knock 1—W26—0.5OEM-A-9———

OEM-A

Mating face
Wire side
CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1A/F sensor heater control (AFSHTC)—W41—0.5G4XXTREMEX-A-A27———
2Ignition power 2 (IGP2)—W1—0.85SP-14V-1———
3Ignition power 1 (IGP1)—W2—0.85SP-14V-1———
4Power ground 2 (PG2)—W7—0.85SP-GND-1———
5Power ground 1 (PG1)—W8—0.85SP-GND-1———
6A/F sensor + (AFS+, wideband Ip)————————
7Crank position sensor (CKP)—W23—0.5G4XXTREMEX-A-A8———
8—————————
9Knock sensor (KS)—W26—0.5G4XXTREMEX-B-B9———
10Sensor ground 2 (SG2)—W14—0.5SP-0V-1———
11Sensor ground 1 (SG1)—W15—0.5SP-0V-1———
12Idle air control valve (IACV)—W42—0.5G4XXTREMEX-A-A26———
13—————————
14—————————
15Throttle position sensor (TPS)—W50—0.5G4XXTREMEX-A-A22———
16A/F sensor - (AFS-, wideband Vs)————————
17—————————
18Vehicle speed sensor (VSS, M/T)—W57—0.5G4XXTREMEX-A-A31———
19Manifold absolute pressure (MAP)—W49—0.5G4XXTREMEX-A-A17———
20Sensor 5V supply 2 (VCC2)—W19—0.5SP-5V1-1———
21Sensor 5V supply 1 (VCC1)—W20—0.5SP-5V1-1———
22A/F sensor heater supply (AFSHTC+)————————
23Logic ground 2 (LG2)—W5—0.85SP-GND-1———
24Logic ground 1 (LG1)—W6—0.85SP-GND-1———
25Camshaft position A (CMP A)—W24—0.5G4XXTREMEX-A-A9———
26Camshaft position B (CMP B)—W25—0.5G4XXTREMEX-A-A30———
27Ignition coil 4 (IGPLS4)—W30—0.5G4XXTREMEX-A-A10———
28Ignition coil 3 (IGPLS3)—W29—0.5G4XXTREMEX-A-A11———
29Ignition coil 2 (IGPLS2)—W28—0.5G4XXTREMEX-A-A12———
30Ignition coil 1 (IGPLS1)—W27—0.5G4XXTREMEX-A-A13———
31—————————

OEM-B

Mating face
Wire side
CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1VTC oil control solenoid (+)—W44—0.5G4XXTREMEX-B-B3———
2Injector 4 (INJ4)—W34—0.5G4XXTREMEX-A-A1———
3Injector 3 (INJ3)—W33—0.5G4XXTREMEX-A-A2———
4Injector 2 (INJ2)—W32—0.5G4XXTREMEX-A-A3———
5Injector 1 (INJ1)—W31—0.5G4XXTREMEX-A-A4———
6Radiator fan control (FANC)—W36—0.5G4XXTREMEX-A-A20———
7Reverse lockout solenoid (RVS, Type-S)—W48—0.5G4XXTREMEX-B-B26———
8Coolant temp sensor (ECT)—W52—0.5G4XXTREMEX-A-A15———
9VTEC oil pressure switch (VTPSW)—W59—0.5G4XXTREMEX-B-B21———
10Alternator L signal (ALTL)—W58—0.5G4XXTREMEX-A-A23———
11—————————
12—————————
13Alternator FR signal (ALTF)—W54—0.5G4XXTREMEX-A-A14———
14—————————
15VTEC solenoid (VTS)—W43—0.5G4XXTREMEX-B-B4———
16—————————
17Intake air temp sensor (IAT)—W53—0.5G4XXTREMEX-A-A16———
18Alternator control (ALTC)—W45—0.5G4XXTREMEX-B-B2———
19—————————
20—————————
21Evap canister purge valve (PCS)—W46—0.5G4XXTREMEX-B-B1———
22—————————
23VTC oil control solenoid (-)—W47—0.5G4XXTREMEX-B-B18———
24—————————

OEM-E

Mating face
Wire side
CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Immobilizer fuel pump relay (IMO FPR)—W37—0.5G4XXTREMEX-A-A19———
2Secondary heated O2 sensor (SHO2S)—W51—0.5G4XXTREMEX-A-A33———
3Logic ground 3 (LG3)—W9—0.85SP-GND-1———
4Sensor ground 3 (SG3)—W16—0.5SP-0V-1———
5Sensor 5V supply 3 (VCC3)—W21—0.5SP-5V1-1———
6Secondary O2 heater control (SO2SHTC)—W40—0.5G4XXTREMEX-A-A28———
7Main relay control (MRLY)—W35—0.5G4XXTREMEX-A-A21———
8A/F sensor heater relay control (AFSHTCR)—W39—0.5G4XXTREMEX-A-A29———
9Ignition switch signal (IG1)————————
10—————————
11—————————
12—————————
13—————————
14Fuel tank pressure sensor (FTP)—W55—0.5G4XXTREMEX-B-B33———
15Electrical load detector (ELD)—W56—0.5G4XXTREMEX-B-B15———
16Power steering pressure switch (PSPSW)—W60—0.5G4XXTREMEX-B-B20———
17—————————
18A/C clutch relay (ACC)—W38—0.5G4XXTREMEX-A-A18———
19—————————
20Brake switch / interlock (2WBS)—W61—0.5G4XXTREMEX-B-B19———
21Evap vent shut valve (VSV)————————
22Brake switch (BKSW)—W62—0.5G4XXTREMEX-B-B30———
23K-line (diagnostic)————————
24Multiplex communication (SEFMJ)————————
25—————————
26Engine speed pulse / tacho (NEP)————————
27Immobilizer code (IMOCD)————————
28—————————
29Service check signal (SCS)————————
30Write enable signal (WEN)————————
31Malfunction indicator lamp (MIL)————————

SP-0V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W16—0.5OEM-E-4———
1——W17—0.5G4XXTREMEX-A-A24———
1——W18—0.5G4XXTREMEX-B-B22———
1——W14—0.5OEM-A-10———
1——W15—0.5OEM-A-11———

SP-14V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W2—0.85OEM-A-3———
1——W1—0.85OEM-A-2———
1——W3—0.85G4XXTREMEX-A-A5———
1——W4—0.85G4XXTREMEX-B-B5———

SP-5V1

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W19—0.5OEM-A-20———
1——W20—0.5OEM-A-21———
1——W21—0.5OEM-E-5———
1——W22—0.5G4XXTREMEX-A-A32———

SP-GND

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W5—0.85OEM-A-23———
1——W6—0.85OEM-A-24———
1——W7—0.85OEM-A-4———
1——W8—0.85OEM-A-5———
1——W9—0.85OEM-E-3———
1——W10—0.85G4XXTREMEX-A-A25———
1——W11—0.85G4XXTREMEX-A-A34———
1——W12—0.85G4XXTREMEX-B-B25———
1——W13—0.85G4XXTREMEX-B-B34———

Pin map

OEM pointOEM functionOEM familyTarget pointTarget functionTarget familyWire colourEvidence
OEM-A-1A/F sensor heater control (AFSHTC)low_side_outG4XXTREMEX-A-A27Aux 7switch_outsingle_source
OEM-A-10Sensor ground 2 (SG2)sensor_groundG4XXTREMEX-A-A24 + G4XXTREMEX-B-B22Sensor Ground + Sensor Groundsensor_groundcorroborated
OEM-A-11Sensor ground 1 (SG1)sensor_groundG4XXTREMEX-A-A24 + G4XXTREMEX-B-B22Sensor Ground + Sensor Groundsensor_groundcorroborated
OEM-A-12Idle air control valve (IACV)low_side_outG4XXTREMEX-A-A26Aux 8switch_outcorroborated
OEM-A-15Throttle position sensor (TPS)analog_inG4XXTREMEX-A-A22Analog Volt 2analog_incorroborated
OEM-A-16A/F sensor - (AFS-, wideband Vs)wb_vs———single_source
OEM-A-18Vehicle speed sensor (VSS, M/T)digital_inG4XXTREMEX-A-A31Digital Input 2digital_incorroborated
OEM-A-19Manifold absolute pressure (MAP)analog_inG4XXTREMEX-A-A17Analog Volt 1analog_incorroborated
OEM-A-2Ignition power 2 (IGP2)power_inG4XXTREMEX-A-A5 + G4XXTREMEX-B-B5+14V ECU Power + Aux 9/10 E-Throttle Supplypower_incorroborated
OEM-A-20Sensor 5V supply 2 (VCC2)vrefG4XXTREMEX-A-A32+5V Outvrefcorroborated
OEM-A-21Sensor 5V supply 1 (VCC1)vrefG4XXTREMEX-A-A32+5V Outvrefcorroborated
OEM-A-22A/F sensor heater supply (AFSHTC+)power_out———single_source
OEM-A-23Logic ground 2 (LG2)groundG4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34System Ground + System Ground + System Ground + System Groundgroundcorroborated
OEM-A-24Logic ground 1 (LG1)groundG4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34System Ground + System Ground + System Ground + System Groundgroundcorroborated
OEM-A-25Camshaft position A (CMP A)trigger_inG4XXTREMEX-A-A9Trigger 2trigger_insingle_source
OEM-A-26Camshaft position B (CMP B)trigger_inG4XXTREMEX-A-A30Digital Input 1digital_insingle_source
OEM-A-27Ignition coil 4 (IGPLS4)ignition_outG4XXTREMEX-A-A10Ignition 4ignition_outcorroborated
OEM-A-28Ignition coil 3 (IGPLS3)ignition_outG4XXTREMEX-A-A11Ignition 3ignition_outcorroborated
OEM-A-29Ignition coil 2 (IGPLS2)ignition_outG4XXTREMEX-A-A12Ignition 2ignition_outcorroborated
OEM-A-3Ignition power 1 (IGP1)power_inG4XXTREMEX-A-A5 + G4XXTREMEX-B-B5+14V ECU Power + Aux 9/10 E-Throttle Supplypower_incorroborated
OEM-A-30Ignition coil 1 (IGPLS1)ignition_outG4XXTREMEX-A-A13Ignition 1ignition_outcorroborated
OEM-A-4Power ground 2 (PG2)groundG4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34System Ground + System Ground + System Ground + System Groundgroundcorroborated
OEM-A-5Power ground 1 (PG1)groundG4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34System Ground + System Ground + System Ground + System Groundgroundcorroborated
OEM-A-6A/F sensor + (AFS+, wideband Ip)wb_ip———single_source
OEM-A-7Crank position sensor (CKP)trigger_inG4XXTREMEX-A-A8Trigger 1trigger_incorroborated
OEM-A-9Knock sensor (KS)knock_inG4XXTREMEX-B-B9Knock 1knock_incorroborated
OEM-B-1VTC oil control solenoid (+)low_side_outG4XXTREMEX-B-B3Injector 6injector_outcorroborated
OEM-B-10Alternator L signal (ALTL)digital_inG4XXTREMEX-A-A23Digital Input 3digital_insingle_source
OEM-B-13Alternator FR signal (ALTF)analog_inG4XXTREMEX-A-A14Analog Volt 4analog_insingle_source
OEM-B-15VTEC solenoid (VTS)low_side_outG4XXTREMEX-B-B4Injector 5injector_outsingle_source
OEM-B-17Intake air temp sensor (IAT)temp_inG4XXTREMEX-A-A16Analog Temp 2temp_incorroborated
OEM-B-18Alternator control (ALTC)low_side_outG4XXTREMEX-B-B2Injector 7injector_outcorroborated
OEM-B-2Injector 4 (INJ4)injector_outG4XXTREMEX-A-A1Injector 4injector_outcorroborated
OEM-B-21Evap canister purge valve (PCS)low_side_outG4XXTREMEX-B-B1Injector 8injector_outcorroborated
OEM-B-23VTC oil control solenoid (-)low_side_outG4XXTREMEX-B-B18Aux 9hbridge_outcorroborated
OEM-B-3Injector 3 (INJ3)injector_outG4XXTREMEX-A-A2Injector 3injector_outcorroborated
OEM-B-4Injector 2 (INJ2)injector_outG4XXTREMEX-A-A3Injector 2injector_outcorroborated
OEM-B-5Injector 1 (INJ1)injector_outG4XXTREMEX-A-A4Injector 1injector_outcorroborated
OEM-B-6Radiator fan control (FANC)low_side_outG4XXTREMEX-A-A20Aux 2low_side_outcorroborated
OEM-B-7Reverse lockout solenoid (RVS, Type-S)low_side_outG4XXTREMEX-B-B26Aux 10hbridge_outcorroborated
OEM-B-8Coolant temp sensor (ECT)temp_inG4XXTREMEX-A-A15Analog Temp 1temp_incorroborated
OEM-B-9VTEC oil pressure switch (VTPSW)digital_inG4XXTREMEX-B-B21Digital Input 4digital_incorroborated
OEM-E-1Immobilizer fuel pump relay (IMO FPR)low_side_outG4XXTREMEX-A-A19Aux 3low_side_outcorroborated
OEM-E-14Fuel tank pressure sensor (FTP)analog_inG4XXTREMEX-B-B33Analog Volt 5analog_incorroborated
OEM-E-15Electrical load detector (ELD)analog_inG4XXTREMEX-B-B15Analog Volt 6analog_incorroborated
OEM-E-16Power steering pressure switch (PSPSW)digital_inG4XXTREMEX-B-B20Digital Input 5digital_incorroborated
OEM-E-18A/C clutch relay (ACC)low_side_outG4XXTREMEX-A-A18Aux 4low_side_outcorroborated
OEM-E-2Secondary heated O2 sensor (SHO2S)lambda_nb_inG4XXTREMEX-A-A33Analog Volt 3analog_incorroborated
OEM-E-20Brake switch / interlock (2WBS)digital_inG4XXTREMEX-B-B19Digital Input 6digital_insingle_source
OEM-E-21Evap vent shut valve (VSV)low_side_out———corroborated
OEM-E-22Brake switch (BKSW)digital_inG4XXTREMEX-B-B30Digital Input 7digital_incorroborated
OEM-E-23K-line (diagnostic)serial———single_source
OEM-E-24Multiplex communication (SEFMJ)serial———corroborated
OEM-E-26Engine speed pulse / tacho (NEP)tacho_out———corroborated
OEM-E-27Immobilizer code (IMOCD)————single_source
OEM-E-29Service check signal (SCS)————single_source
OEM-E-3Logic ground 3 (LG3)groundG4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34System Ground + System Ground + System Ground + System Groundgroundcorroborated
OEM-E-30Write enable signal (WEN)————single_source
OEM-E-31Malfunction indicator lamp (MIL)low_side_out———corroborated
OEM-E-4Sensor ground 3 (SG3)sensor_groundG4XXTREMEX-A-A24 + G4XXTREMEX-B-B22Sensor Ground + Sensor Groundsensor_groundcorroborated
OEM-E-5Sensor 5V supply 3 (VCC3)vrefG4XXTREMEX-A-A32+5V Outvrefcorroborated
OEM-E-6Secondary O2 heater control (SO2SHTC)low_side_outG4XXTREMEX-A-A28Aux 6switch_outcorroborated
OEM-E-7Main relay control (MRLY)low_side_outG4XXTREMEX-A-A21Aux 1low_side_outcorroborated
OEM-E-8A/F sensor heater relay control (AFSHTCR)low_side_outG4XXTREMEX-A-A29Aux 5switch_outcorroborated
OEM-E-9Ignition switch signal (IG1)digital_in———corroborated

Cut list

WireFromToGauge (mm²)ColourLengthSignalIdent
W1OEM-A-2SP-14V-10.85no routeIgnition power 2 (IGP2)—
W2OEM-A-3SP-14V-10.85no routeIgnition power 1 (IGP1)—
W3SP-14V-1G4XXTREMEX-A-A50.85no route+14V ECU Power—
W4SP-14V-1G4XXTREMEX-B-B50.85no routeAux 9/10 E-Throttle Supply—
W5OEM-A-23SP-GND-10.85no routeLogic ground 2 (LG2)—
W6OEM-A-24SP-GND-10.85no routeLogic ground 1 (LG1)—
W7OEM-A-4SP-GND-10.85no routePower ground 2 (PG2)—
W8OEM-A-5SP-GND-10.85no routePower ground 1 (PG1)—
W9OEM-E-3SP-GND-10.85no routeLogic ground 3 (LG3)—
W10SP-GND-1G4XXTREMEX-A-A250.85no routeSystem Ground—
W11SP-GND-1G4XXTREMEX-A-A340.85no routeSystem Ground—
W12SP-GND-1G4XXTREMEX-B-B250.85no routeSystem Ground—
W13SP-GND-1G4XXTREMEX-B-B340.85no routeSystem Ground—
W14OEM-A-10SP-0V-10.5no routeSensor ground 2 (SG2)—
W15OEM-A-11SP-0V-10.5no routeSensor ground 1 (SG1)—
W16OEM-E-4SP-0V-10.5no routeSensor ground 3 (SG3)—
W17SP-0V-1G4XXTREMEX-A-A240.5no routeSensor Ground—
W18SP-0V-1G4XXTREMEX-B-B220.5no routeSensor Ground—
W19OEM-A-20SP-5V1-10.5no routeSensor 5V supply 2 (VCC2)—
W20OEM-A-21SP-5V1-10.5no routeSensor 5V supply 1 (VCC1)—
W21OEM-E-5SP-5V1-10.5no routeSensor 5V supply 3 (VCC3)—
W22SP-5V1-1G4XXTREMEX-A-A320.5no route+5V Out—
W23OEM-A-7G4XXTREMEX-A-A80.5no routeCrank position sensor (CKP)—
W24OEM-A-25G4XXTREMEX-A-A90.5no routeCamshaft position A (CMP A)—
W25OEM-A-26G4XXTREMEX-A-A300.5no routeCamshaft position B (CMP B)—
W26OEM-A-9G4XXTREMEX-B-B90.5no routeKnock sensor (KS)—
W27OEM-A-30G4XXTREMEX-A-A130.5no routeIgnition coil 1 (IGPLS1)—
W28OEM-A-29G4XXTREMEX-A-A120.5no routeIgnition coil 2 (IGPLS2)—
W29OEM-A-28G4XXTREMEX-A-A110.5no routeIgnition coil 3 (IGPLS3)—
W30OEM-A-27G4XXTREMEX-A-A100.5no routeIgnition coil 4 (IGPLS4)—
W31OEM-B-5G4XXTREMEX-A-A40.5no routeInjector 1 (INJ1)—
W32OEM-B-4G4XXTREMEX-A-A30.5no routeInjector 2 (INJ2)—
W33OEM-B-3G4XXTREMEX-A-A20.5no routeInjector 3 (INJ3)—
W34OEM-B-2G4XXTREMEX-A-A10.5no routeInjector 4 (INJ4)—
W35OEM-E-7G4XXTREMEX-A-A210.5no routeMain relay control (MRLY)—
W36OEM-B-6G4XXTREMEX-A-A200.5no routeRadiator fan control (FANC)—
W37OEM-E-1G4XXTREMEX-A-A190.5no routeImmobilizer fuel pump relay (IMO FPR)—
W38OEM-E-18G4XXTREMEX-A-A180.5no routeA/C clutch relay (ACC)—
W39OEM-E-8G4XXTREMEX-A-A290.5no routeA/F sensor heater relay control (AFSHTCR)—
W40OEM-E-6G4XXTREMEX-A-A280.5no routeSecondary O2 heater control (SO2SHTC)—
W41OEM-A-1G4XXTREMEX-A-A270.5no routeA/F sensor heater control (AFSHTC)—
W42OEM-A-12G4XXTREMEX-A-A260.5no routeIdle air control valve (IACV)—
W43OEM-B-15G4XXTREMEX-B-B40.5no routeVTEC solenoid (VTS)—
W44OEM-B-1G4XXTREMEX-B-B30.5no routeVTC oil control solenoid (+)—
W45OEM-B-18G4XXTREMEX-B-B20.5no routeAlternator control (ALTC)—
W46OEM-B-21G4XXTREMEX-B-B10.5no routeEvap canister purge valve (PCS)—
W47OEM-B-23G4XXTREMEX-B-B180.5no routeVTC oil control solenoid (-)—
W48OEM-B-7G4XXTREMEX-B-B260.5no routeReverse lockout solenoid (RVS, Type-S)—
W49OEM-A-19G4XXTREMEX-A-A170.5no routeManifold absolute pressure (MAP)—
W50OEM-A-15G4XXTREMEX-A-A220.5no routeThrottle position sensor (TPS)—
W51OEM-E-2G4XXTREMEX-A-A330.5no routeSecondary heated O2 sensor (SHO2S)—
W52OEM-B-8G4XXTREMEX-A-A150.5no routeCoolant temp sensor (ECT)—
W53OEM-B-17G4XXTREMEX-A-A160.5no routeIntake air temp sensor (IAT)—
W54OEM-B-13G4XXTREMEX-A-A140.5no routeAlternator FR signal (ALTF)—
W55OEM-E-14G4XXTREMEX-B-B330.5no routeFuel tank pressure sensor (FTP)—
W56OEM-E-15G4XXTREMEX-B-B150.5no routeElectrical load detector (ELD)—
W57OEM-A-18G4XXTREMEX-A-A310.5no routeVehicle speed sensor (VSS, M/T)—
W58OEM-B-10G4XXTREMEX-A-A230.5no routeAlternator L signal (ALTL)—
W59OEM-B-9G4XXTREMEX-B-B210.5no routeVTEC oil pressure switch (VTPSW)—
W60OEM-E-16G4XXTREMEX-B-B200.5no routePower steering pressure switch (PSPSW)—
W61OEM-E-20G4XXTREMEX-B-B190.5no routeBrake switch / interlock (2WBS)—
W62OEM-E-22G4XXTREMEX-B-B300.5no routeBrake switch (BKSW)—

Bill of materials

CategoryPart numberManufacturerDescriptionQtyUnit
connector1318682-6TEK-series ECU harness plug A (040-3 HD plug assy, 31P)1.000ea
connector353029-1TEK-series ECU harness plug B (040 H/D-3 plug HSG assy, 24P)1.000ea
connector353826-1TEK-series ECU harness plug E (040 HD 31P plug HSG assy-B, 31P)1.000ea
terminal316836-1TEMultilock 040 III HD socket, tin, 22–18 AWG (0.3–0.85 mm²)53.000ea

ECU setup sheet

RoleEngine refEngine signalSensorECU pointECU functionECU classSetup flag
No configured channels.

Findings

Open (27)

SeverityCodeSubjectMessage
warnDATASET_GAPRSX ECU A5 of 31 cavities on RSX ECU A have no pin data (8,13,14,17,31). Anything there is invisible to these checks.
warnDATASET_GAPRSX ECU B8 of 24 cavities on RSX ECU B have no pin data (11,12,14,16,19,20,22,24). Anything there is invisible to these checks.
warnDATASET_GAPRSX ECU E8 of 31 cavities on RSX ECU E have no pin data (10,11,12,13,17,19,25,28). Anything there is invisible to these checks.
warnLOAD_UNKNOWNG4XXTREMEX-A-A1G4XXTREMEX-A-A1 "Injector 4" drives OEM-B-2 Injector 4 (INJ4) (load 1.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A18G4XXTREMEX-A-A18 "Aux 4" drives OEM-E-18 A/C clutch relay (ACC) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A19G4XXTREMEX-A-A19 "Aux 3" drives OEM-E-1 Immobilizer fuel pump relay (IMO FPR) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A2G4XXTREMEX-A-A2 "Injector 3" drives OEM-B-3 Injector 3 (INJ3) (load 1.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A20G4XXTREMEX-A-A20 "Aux 2" drives OEM-B-6 Radiator fan control (FANC) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A21G4XXTREMEX-A-A21 "Aux 1" drives OEM-E-7 Main relay control (MRLY) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A26G4XXTREMEX-A-A26 "Aux 8" drives OEM-A-12 Idle air control valve (IACV) (load 1.0 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A29G4XXTREMEX-A-A29 "Aux 5" drives OEM-E-8 A/F sensor heater relay control (AFSHTCR) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A3G4XXTREMEX-A-A3 "Injector 2" drives OEM-B-4 Injector 2 (INJ2) (load 1.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-A-A4G4XXTREMEX-A-A4 "Injector 1" drives OEM-B-5 Injector 1 (INJ1) (load 1.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNG4XXTREMEX-B-B4G4XXTREMEX-B-B4 "Injector 5" drives OEM-B-15 VTEC solenoid (VTS) (load 1.0 A) but its current rating is unknown. Check the ECU manual.
warnNET_FAMILYOEM-A-26 ↔ G4XXTREMEX-A-A30OEM-A-26 "Camshaft position B (CMP B)" [trigger_in] is wired to G4XXTREMEX-A-A30 "Digital Input 1" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot.
warnNET_FAMILYOEM-B-23 ↔ G4XXTREMEX-B-B18OEM-B-23 "VTC oil control solenoid (-)" [low_side_out] is wired to G4XXTREMEX-B-B18 "Aux 9" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way.
warnNET_FAMILYOEM-B-7 ↔ G4XXTREMEX-B-B26OEM-B-7 "Reverse lockout solenoid (RVS, Type-S)" [low_side_out] is wired to G4XXTREMEX-B-B26 "Aux 10" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way.
warnSUPPLY_GROUPG4XXTREMEX-A-A32 + OEM-A-20 + OEM-A-21 + OEM-E-5 + SP-5V1-1Supplies meant to stay independent share one net: OEM-A-20 [k_vcc2], OEM-A-21 [k_vcc1], OEM-E-5 [k_vcc3]. The new ECU has no free 5 V reference, so they share one: normal on a standalone, but a short on any of these sensors drops them all.
infoNET_FAMILYOEM-A-1 ↔ G4XXTREMEX-A-A27OEM-A-1 "A/F sensor heater control (AFSHTC)" [low_side_out] is wired to G4XXTREMEX-A-A27 "Aux 7" [switch_out]. Configure this output as low side.
infoNET_FAMILYOEM-A-12 ↔ G4XXTREMEX-A-A26OEM-A-12 "Idle air control valve (IACV)" [low_side_out] is wired to G4XXTREMEX-A-A26 "Aux 8" [switch_out]. Configure this output as low side.
infoNET_FAMILYOEM-B-1 ↔ G4XXTREMEX-B-B3OEM-B-1 "VTC oil control solenoid (+)" [low_side_out] is wired to G4XXTREMEX-B-B3 "Injector 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-B-15 ↔ G4XXTREMEX-B-B4OEM-B-15 "VTEC solenoid (VTS)" [low_side_out] is wired to G4XXTREMEX-B-B4 "Injector 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-B-18 ↔ G4XXTREMEX-B-B2OEM-B-18 "Alternator control (ALTC)" [low_side_out] is wired to G4XXTREMEX-B-B2 "Injector 7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-B-21 ↔ G4XXTREMEX-B-B1OEM-B-21 "Evap canister purge valve (PCS)" [low_side_out] is wired to G4XXTREMEX-B-B1 "Injector 8" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-E-6 ↔ G4XXTREMEX-A-A28OEM-E-6 "Secondary O2 heater control (SO2SHTC)" [low_side_out] is wired to G4XXTREMEX-A-A28 "Aux 6" [switch_out]. Configure this output as low side.
infoNET_FAMILYOEM-E-8 ↔ G4XXTREMEX-A-A29OEM-E-8 "A/F sensor heater relay control (AFSHTCR)" [low_side_out] is wired to G4XXTREMEX-A-A29 "Aux 5" [switch_out]. Configure this output as low side.
infoUNMAPPEDOEM12 optional OEM pins are not mapped: OEM-A-16 A/F sensor - (AFS-, wideband Vs); OEM-A-22 A/F sensor heater supply (AFSHTC+); OEM-A-6 A/F sensor + (AFS+, wideband Ip); OEM-E-21 Evap vent shut valve (VSV); OEM-E-23 K-line (diagnostic); OEM-E-24 Multiplex communication (SEFMJ); OEM-E-26 Engine speed pulse / tacho (NEP); OEM-E-27 Immobilizer code (IMOCD); OEM-E-29 Service check signal (SCS); OEM-E-30 Write enable signal (WEN); OEM-E-31 Malfunction indicator lamp (MIL); OEM-E-9 Ignition switch signal (IG1)

Accepted (0)

CodeSubjectReasonBy

Notes

Fit check: unconfirmed. Confirm these before building: - Trigger pattern for Honda K20A2 not found in the ECU's docs (Link's trigger-mode list is only inside PCLink, not online) Auto-mapped by auto_map() from the library pin data on 2026-10-06. Review every wire against both manuals before building. Not wired: - OEM-E 9: Ignition switch signal (IG1): key-on 12 V sense — optional in a swap (the main relay is energized from keyed 12 V, not from this pin); Link G4X XtremeX has no dedicated key-on input - OEM-E 21: Evap vent shut valve (VSV): no free low_side/ls_hs/injector/hbridge on Link G4X XtremeX - OEM-E 31: Malfunction indicator lamp (MIL): no free low_side/ls_hs/injector/hbridge on Link G4X XtremeX - OEM-E 26: Engine speed pulse / tacho (NEP): no free tacho/frequency_out/low_side/ls_hs on Link G4X XtremeX - OEM-A 6: A/F sensor + (AFS+, wideband Ip): no free wb_ip on Link G4X XtremeX - OEM-A 16: A/F sensor - (AFS-, wideband Vs): no free wb_vs on Link G4X XtremeX - OEM-A 22: A/F sensor heater supply (AFSHTC+): no free heater_feed on Link G4X XtremeX - OEM-E 23: K-line (diagnostic): no free k_line on Link G4X XtremeX - OEM-E 24: Multiplex communication (SEFMJ): no free k_line on Link G4X XtremeX - OEM-E 27: Immobilizer code (IMOCD): not classified in the library; wire by hand - OEM-E 29: Service check signal (SCS): not classified in the library; wire by hand - OEM-E 30: Write enable signal (WEN): not classified in the library; wire by hand

Sources

ReliabilityKindTitleURLArchiveCapturedSHA-256
4vendor_docLink: CIVICLink K20X (HC20X) DC5 installation manualhttps://linkecu.com/documentation/237-4000%20DC5.pdfarchive2026-10-058a1a71301571
4vendor_docLink: G4X XtremeX quickstart guidehttps://linkecu.com/documentation/XtremeXQuickstartGuide.pdf———
3forumFFS TechNet: K-series 02-06 RSX ECU pin diagram (Helm)https://ff-squad.com/technet2/k-series-02-06-rsx-ecu-pin-diagram/archive2026-10-05b2b85002666e
3community_copyYourSpec: Link G4X XtremeX flying-lead harness wiring listhttps://wpm.yourspec.com/projects/view/1488———