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RSX Type-S 2002-04 (K20A2) → MaxxECU MaxxECU PRO REV10+ (auto)

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

Revisions

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Schematic

MAXXECUPRO-C1MAXXECUPRO-C2MAXXECUPRO-C3MAXXECUPRO-C4OEM-AOEM-BOEM-ESP-0VSP-14VSP-GND

Connectors

MAXXECUPRO-C1

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
A1GPO 5—W41—0.5OEM-E-8———
A2IGN 1—W28—0.5OEM-A-30———
A3IGN 2—W29—0.5OEM-A-29———
A4GPO 8/TACHO—W46—0.5OEM-B-1———
B1GPO 6—W44—0.5OEM-A-12———
B2IGN 3—W30—0.5OEM-A-28———
B3IGN 4—W31—0.5OEM-A-27———
B4GPO 1—W37—0.5OEM-E-7———
C1GPO 7—W45—0.5OEM-B-15———
C2IGN 5————————
C3IGN 6————————
C4GPO 2—W38—0.5OEM-B-6———
D1WBO2 Heater-—W42—0.5OEM-E-6———
D2IGN 7————————
D3IGN 8————————
D4GPO 3—W39—0.5OEM-E-1———
E1CAN H————————
E2CAN L————————
E3GND Shield————————
E4GPO 4—W40—0.5OEM-E-18———
F1CLT————————
F2IAT————————
F3WBO2 VREF————————
F4WBO2 VS—W55—0.5OEM-A-16———
G1+5V sensor supply—W22—0.5OEM-A-20———
G2TPS/AIN—W57—0.5OEM-A-15———
G3WBO2 IP—W54—0.5OEM-A-6———
G4WBO2 RCAL————————
H1Sensor GND—W18—0.5SP-0V-1———
H2Trigger GND—W19—0.5SP-0V-1———
H3TRIGGER—W25—0.5OEM-A-7———
H4HOME—W26—0.5OEM-A-25———
J1AIN 1 (temperature)—W59—0.5OEM-B-8———
J2AIN 2 (temperature)—W60—0.5OEM-B-17———
J3AIN 3 (0-5V)—W56—0.5OEM-A-19———
J4AIN 4 (0-5V)—W58—0.5OEM-E-2———
K1INJ 1—W32—0.5OEM-B-5———
K2INJ 2—W33—0.5OEM-B-4———
K3DIN/VR 1—W64—0.5OEM-A-18———
K4DIN/VR 2—W65—0.5OEM-B-10———
L1INJ 8————————
L2INJ 7————————
L3INJ 6————————
L4Engine GND—W10—0.85SP-GND-1———
M1INJ 3—W34—0.5OEM-B-3———
M2INJ 4—W35—0.5OEM-B-2———
M3INJ 5————————
M4+12V ECU power supply—W3—0.85SP-14V-1———

MAXXECUPRO-C2

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
A1EGT 1+————————
A2EGT 2+————————
A3EGT 3+————————
A4EGT 4+————————
B1EGT 1-————————
B2EGT 2-————————
B3EGT 3-————————
B4EGT 4-————————
C1EGT 5+————————
C2EGT 6+————————
C3EGT 7+————————
C4EGT 8+————————
D1EGT 5-————————
D2EGT 6-————————
D3EGT 7-————————
D4EGT 8-————————
E1EGT 9+————————
E2EGT 10+————————
E3EGT 11+————————
E4EGT 12+————————
F1EGT 9-————————
F2EGT 10-————————
F3EGT 11-————————
F4EGT 12-————————
H1Engine ground 3—W11—0.85SP-GND-1———
H2Engine ground 3—W12—0.85SP-GND-1———
H3Engine ground 3—W13—0.85SP-GND-1———

MAXXECUPRO-C3

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
A1DIN/VR 4————————
A2DIN/VR 5————————
A3DIN 6 (SWITCH)—W66—0.5OEM-B-9———
A4DIN 7 (SWITCH)—W67—0.5OEM-E-16———
B1WBO2 2 RCAL————————
B2WBO2 2 IP————————
B3WBO2 2 VS————————
B4WBO2 2 COM————————
C1WBO2 2 Shield————————
C2+5V SENSOR SUPPLY 2—W23—0.5OEM-A-21———
C3ANALOG IN 5 (0-5V)—W61—0.5OEM-B-13———
C4GPO 19 (12V)————————
D1ANALOG IN 6 (0-5V)—W62—0.5OEM-E-14———
D2ANALOG IN 7 (0-5V)—W63—0.5OEM-E-15———
D3ANALOG IN 8 (0-5V)————————
D4GPO 20 (12V)————————
E1GPO 10/WBO2 2 HTR—W43—0.5OEM-A-1———
E2ANALOG IN 9 (0-5V)————————
E3ANALOG IN 10 (0-5V)————————
E4GPO 21 (12V)————————
F1INJECTOR OUT 15————————
F2ANALOG IN 11 (0-5V)————————
F3ANALOG IN 12 (0-5V)————————
F4GPO 22 (12V)————————
G1INJECTOR OUT 14————————
G2IGNITION OUT 11————————
G3IGNITION OUT 9————————
G4GPO 15 (12V)————————
H1INJECTOR OUT 13————————
H2IGNITION OUT 12————————
H3IGNITION OUT 10————————
H4GPO 16 (12V)————————
J1INJECTOR OUT 16————————
J2SENSOR GND—W20—0.5SP-0V-1———
J3SENSOR GND—W21—0.5SP-0V-1———
J4GPO 17 (12V)————————
K1INJECTOR OUT 10————————
K2INJECTOR OUT 9————————
K3KEY IN 12V—W36—0.5OEM-E-9———
K4GPO 18 (12V)————————
L1INJECTOR OUT 11————————
L2GPO 12/MOTOR 1 +————————
L3GPO 11/MOTOR 1 -————————
L4ENGINE GROUND 2—W14—0.85SP-GND-1———
M1INJECTOR OUT 12————————
M2GPO 13/MOTOR 2 +————————
M3GPO 14/MOTOR 2 -————————
M412V ECU 2—W4—0.85SP-14V-1———

MAXXECUPRO-C4

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
A1CAN 2 H————————
A2CAN 2 L————————
A30-5V out 1————————
A40-5V out 2————————
B1AIN 18 (0-5V)————————
B2AIN 17 (0-5V)————————
B3AIN 16 (0-5V)————————
B4AIN 15 (0-5V)————————
C1AIN 14 (0-5V)————————
C2AIN 13 (0-5V)————————
C3AIN 19 (temp)————————
C4AIN 20 (temp)————————
D1AIN 21 (temp)————————
D2AIN 22 (temp)————————
D3DIN 8 (switch)—W68—0.5OEM-E-20———
D4DIN 9 (switch)—W69—0.5OEM-E-22———
E1DIN 10 (switch)————————
E2DIN 11 (switch)————————
E3+5V sensor supply 3—W24—0.5OEM-E-5———
E45-10V sensor supply————————
F1GPO 23-30 flyback————————
F2Knock 1—W27—0.5OEM-A-9———
F3Knock 2————————
F4Sensor GND3 / knock ground————————
G1GPO 23—W47—0.5OEM-B-18———
G2GPO 24—W48—0.5OEM-B-21———
G3GPO 25—W49—0.5OEM-B-23———
G4GPO 26—W50—0.5OEM-B-7———
H1GPO 27—W51—0.5OEM-E-21———
H2GPO 28—W52—0.5OEM-E-31———
H3GPO 29—W53—0.5OEM-E-26———
H4GPO 30————————

OEM-A

Mating face
Wire side
CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1A/F sensor heater control (AFSHTC)—W43—0.5MAXXECUPRO-C3-E1———
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)—W54—0.5MAXXECUPRO-C1-G3———
7Crank position sensor (CKP)—W25—0.5MAXXECUPRO-C1-H3———
8—————————
9Knock sensor (KS)—W27—0.5MAXXECUPRO-C4-F2———
10Sensor ground 2 (SG2)—W15—0.5SP-0V-1———
11Sensor ground 1 (SG1)—W16—0.5SP-0V-1———
12Idle air control valve (IACV)—W44—0.5MAXXECUPRO-C1-B1———
13—————————
14—————————
15Throttle position sensor (TPS)—W57—0.5MAXXECUPRO-C1-G2———
16A/F sensor - (AFS-, wideband Vs)—W55—0.5MAXXECUPRO-C1-F4———
17—————————
18Vehicle speed sensor (VSS, M/T)—W64—0.5MAXXECUPRO-C1-K3———
19Manifold absolute pressure (MAP)—W56—0.5MAXXECUPRO-C1-J3———
20Sensor 5V supply 2 (VCC2)—W22—0.5MAXXECUPRO-C1-G1———
21Sensor 5V supply 1 (VCC1)—W23—0.5MAXXECUPRO-C3-C2———
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)—W26—0.5MAXXECUPRO-C1-H4———
26Camshaft position B (CMP B)————————
27Ignition coil 4 (IGPLS4)—W31—0.5MAXXECUPRO-C1-B3———
28Ignition coil 3 (IGPLS3)—W30—0.5MAXXECUPRO-C1-B2———
29Ignition coil 2 (IGPLS2)—W29—0.5MAXXECUPRO-C1-A3———
30Ignition coil 1 (IGPLS1)—W28—0.5MAXXECUPRO-C1-A2———
31—————————

OEM-B

Mating face
Wire side
CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1VTC oil control solenoid (+)—W46—0.5MAXXECUPRO-C1-A4———
2Injector 4 (INJ4)—W35—0.5MAXXECUPRO-C1-M2———
3Injector 3 (INJ3)—W34—0.5MAXXECUPRO-C1-M1———
4Injector 2 (INJ2)—W33—0.5MAXXECUPRO-C1-K2———
5Injector 1 (INJ1)—W32—0.5MAXXECUPRO-C1-K1———
6Radiator fan control (FANC)—W38—0.5MAXXECUPRO-C1-C4———
7Reverse lockout solenoid (RVS, Type-S)—W50—0.5MAXXECUPRO-C4-G4———
8Coolant temp sensor (ECT)—W59—0.5MAXXECUPRO-C1-J1———
9VTEC oil pressure switch (VTPSW)—W66—0.5MAXXECUPRO-C3-A3———
10Alternator L signal (ALTL)—W65—0.5MAXXECUPRO-C1-K4———
11—————————
12—————————
13Alternator FR signal (ALTF)—W61—0.5MAXXECUPRO-C3-C3———
14—————————
15VTEC solenoid (VTS)—W45—0.5MAXXECUPRO-C1-C1———
16—————————
17Intake air temp sensor (IAT)—W60—0.5MAXXECUPRO-C1-J2———
18Alternator control (ALTC)—W47—0.5MAXXECUPRO-C4-G1———
19—————————
20—————————
21Evap canister purge valve (PCS)—W48—0.5MAXXECUPRO-C4-G2———
22—————————
23VTC oil control solenoid (-)—W49—0.5MAXXECUPRO-C4-G3———
24—————————

OEM-E

Mating face
Wire side
CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Immobilizer fuel pump relay (IMO FPR)—W39—0.5MAXXECUPRO-C1-D4———
2Secondary heated O2 sensor (SHO2S)—W58—0.5MAXXECUPRO-C1-J4———
3Logic ground 3 (LG3)—W9—0.85SP-GND-1———
4Sensor ground 3 (SG3)—W17—0.5SP-0V-1———
5Sensor 5V supply 3 (VCC3)—W24—0.5MAXXECUPRO-C4-E3———
6Secondary O2 heater control (SO2SHTC)—W42—0.5MAXXECUPRO-C1-D1———
7Main relay control (MRLY)—W37—0.5MAXXECUPRO-C1-B4———
8A/F sensor heater relay control (AFSHTCR)—W41—0.5MAXXECUPRO-C1-A1———
9Ignition switch signal (IG1)—W36—0.5MAXXECUPRO-C3-K3———
10—————————
11—————————
12—————————
13—————————
14Fuel tank pressure sensor (FTP)—W62—0.5MAXXECUPRO-C3-D1———
15Electrical load detector (ELD)—W63—0.5MAXXECUPRO-C3-D2———
16Power steering pressure switch (PSPSW)—W67—0.5MAXXECUPRO-C3-A4———
17—————————
18A/C clutch relay (ACC)—W40—0.5MAXXECUPRO-C1-E4———
19—————————
20Brake switch / interlock (2WBS)—W68—0.5MAXXECUPRO-C4-D3———
21Evap vent shut valve (VSV)—W51—0.5MAXXECUPRO-C4-H1———
22Brake switch (BKSW)—W69—0.5MAXXECUPRO-C4-D4———
23K-line (diagnostic)————————
24Multiplex communication (SEFMJ)————————
25—————————
26Engine speed pulse / tacho (NEP)—W53—0.5MAXXECUPRO-C4-H3———
27Immobilizer code (IMOCD)————————
28—————————
29Service check signal (SCS)————————
30Write enable signal (WEN)————————
31Malfunction indicator lamp (MIL)—W52—0.5MAXXECUPRO-C4-H2———

SP-0V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W21—0.5MAXXECUPRO-C3-J3———
1——W15—0.5OEM-A-10———
1——W16—0.5OEM-A-11———
1——W17—0.5OEM-E-4———
1——W18—0.5MAXXECUPRO-C1-H1———
1——W19—0.5MAXXECUPRO-C1-H2———
1——W20—0.5MAXXECUPRO-C3-J2———

SP-14V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W1—0.85OEM-A-2———
1——W2—0.85OEM-A-3———
1——W3—0.85MAXXECUPRO-C1-M4———
1——W4—0.85MAXXECUPRO-C3-M4———

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—0.85MAXXECUPRO-C1-L4———
1——W11—0.85MAXXECUPRO-C2-H1———
1——W12—0.85MAXXECUPRO-C2-H2———
1——W13—0.85MAXXECUPRO-C2-H3———
1——W14—0.85MAXXECUPRO-C3-L4———

Pin map

OEM pointOEM functionOEM familyTarget pointTarget functionTarget familyWire colourEvidence
OEM-A-1A/F sensor heater control (AFSHTC)low_side_outMAXXECUPRO-C3-E1GPO 10/WBO2 2 HTRlow_side_outsingle_source
OEM-A-10Sensor ground 2 (SG2)sensor_groundMAXXECUPRO-C1-H1 + MAXXECUPRO-C1-H2 + MAXXECUPRO-C3-J2 + MAXXECUPRO-C3-J3Sensor GND + Trigger GND + SENSOR GND + SENSOR GNDsensor_groundcorroborated
OEM-A-11Sensor ground 1 (SG1)sensor_groundMAXXECUPRO-C1-H1 + MAXXECUPRO-C1-H2 + MAXXECUPRO-C3-J2 + MAXXECUPRO-C3-J3Sensor GND + Trigger GND + SENSOR GND + SENSOR GNDsensor_groundcorroborated
OEM-A-12Idle air control valve (IACV)low_side_outMAXXECUPRO-C1-B1GPO 6low_side_outcorroborated
OEM-A-15Throttle position sensor (TPS)analog_inMAXXECUPRO-C1-G2TPS/AINanalog_incorroborated
OEM-A-16A/F sensor - (AFS-, wideband Vs)wb_vsMAXXECUPRO-C1-F4WBO2 VSwb_vssingle_source
OEM-A-18Vehicle speed sensor (VSS, M/T)digital_inMAXXECUPRO-C1-K3DIN/VR 1digital_incorroborated
OEM-A-19Manifold absolute pressure (MAP)analog_inMAXXECUPRO-C1-J3AIN 3 (0-5V)analog_incorroborated
OEM-A-2Ignition power 2 (IGP2)power_inMAXXECUPRO-C1-M4 + MAXXECUPRO-C3-M4+12V ECU power supply + 12V ECU 2power_incorroborated
OEM-A-20Sensor 5V supply 2 (VCC2)vrefMAXXECUPRO-C1-G1+5V sensor supplyvrefcorroborated
OEM-A-21Sensor 5V supply 1 (VCC1)vrefMAXXECUPRO-C3-C2+5V SENSOR SUPPLY 2vrefcorroborated
OEM-A-22A/F sensor heater supply (AFSHTC+)power_out———single_source
OEM-A-23Logic ground 2 (LG2)groundMAXXECUPRO-C1-L4 + MAXXECUPRO-C2-H1 + MAXXECUPRO-C2-H2 + MAXXECUPRO-C2-H3 + MAXXECUPRO-C3-L4Engine GND + Engine ground 3 + Engine ground 3 + Engine ground 3 + ENGINE GROUND 2groundcorroborated
OEM-A-24Logic ground 1 (LG1)groundMAXXECUPRO-C1-L4 + MAXXECUPRO-C2-H1 + MAXXECUPRO-C2-H2 + MAXXECUPRO-C2-H3 + MAXXECUPRO-C3-L4Engine GND + Engine ground 3 + Engine ground 3 + Engine ground 3 + ENGINE GROUND 2groundcorroborated
OEM-A-25Camshaft position A (CMP A)trigger_inMAXXECUPRO-C1-H4HOMEtrigger_insingle_source
OEM-A-26Camshaft position B (CMP B)trigger_in———single_source
OEM-A-27Ignition coil 4 (IGPLS4)ignition_outMAXXECUPRO-C1-B3IGN 4ignition_outcorroborated
OEM-A-28Ignition coil 3 (IGPLS3)ignition_outMAXXECUPRO-C1-B2IGN 3ignition_outcorroborated
OEM-A-29Ignition coil 2 (IGPLS2)ignition_outMAXXECUPRO-C1-A3IGN 2ignition_outcorroborated
OEM-A-3Ignition power 1 (IGP1)power_inMAXXECUPRO-C1-M4 + MAXXECUPRO-C3-M4+12V ECU power supply + 12V ECU 2power_incorroborated
OEM-A-30Ignition coil 1 (IGPLS1)ignition_outMAXXECUPRO-C1-A2IGN 1ignition_outcorroborated
OEM-A-4Power ground 2 (PG2)groundMAXXECUPRO-C1-L4 + MAXXECUPRO-C2-H1 + MAXXECUPRO-C2-H2 + MAXXECUPRO-C2-H3 + MAXXECUPRO-C3-L4Engine GND + Engine ground 3 + Engine ground 3 + Engine ground 3 + ENGINE GROUND 2groundcorroborated
OEM-A-5Power ground 1 (PG1)groundMAXXECUPRO-C1-L4 + MAXXECUPRO-C2-H1 + MAXXECUPRO-C2-H2 + MAXXECUPRO-C2-H3 + MAXXECUPRO-C3-L4Engine GND + Engine ground 3 + Engine ground 3 + Engine ground 3 + ENGINE GROUND 2groundcorroborated
OEM-A-6A/F sensor + (AFS+, wideband Ip)wb_ipMAXXECUPRO-C1-G3WBO2 IPwb_ipsingle_source
OEM-A-7Crank position sensor (CKP)trigger_inMAXXECUPRO-C1-H3TRIGGERtrigger_incorroborated
OEM-A-9Knock sensor (KS)knock_inMAXXECUPRO-C4-F2Knock 1knock_incorroborated
OEM-B-1VTC oil control solenoid (+)low_side_outMAXXECUPRO-C1-A4GPO 8/TACHOlow_side_outcorroborated
OEM-B-10Alternator L signal (ALTL)digital_inMAXXECUPRO-C1-K4DIN/VR 2digital_insingle_source
OEM-B-13Alternator FR signal (ALTF)analog_inMAXXECUPRO-C3-C3ANALOG IN 5 (0-5V)analog_insingle_source
OEM-B-15VTEC solenoid (VTS)low_side_outMAXXECUPRO-C1-C1GPO 7low_side_outsingle_source
OEM-B-17Intake air temp sensor (IAT)temp_inMAXXECUPRO-C1-J2AIN 2 (temperature)temp_incorroborated
OEM-B-18Alternator control (ALTC)low_side_outMAXXECUPRO-C4-G1GPO 23low_side_outcorroborated
OEM-B-2Injector 4 (INJ4)injector_outMAXXECUPRO-C1-M2INJ 4injector_outcorroborated
OEM-B-21Evap canister purge valve (PCS)low_side_outMAXXECUPRO-C4-G2GPO 24low_side_outcorroborated
OEM-B-23VTC oil control solenoid (-)low_side_outMAXXECUPRO-C4-G3GPO 25low_side_outcorroborated
OEM-B-3Injector 3 (INJ3)injector_outMAXXECUPRO-C1-M1INJ 3injector_outcorroborated
OEM-B-4Injector 2 (INJ2)injector_outMAXXECUPRO-C1-K2INJ 2injector_outcorroborated
OEM-B-5Injector 1 (INJ1)injector_outMAXXECUPRO-C1-K1INJ 1injector_outcorroborated
OEM-B-6Radiator fan control (FANC)low_side_outMAXXECUPRO-C1-C4GPO 2low_side_outcorroborated
OEM-B-7Reverse lockout solenoid (RVS, Type-S)low_side_outMAXXECUPRO-C4-G4GPO 26low_side_outcorroborated
OEM-B-8Coolant temp sensor (ECT)temp_inMAXXECUPRO-C1-J1AIN 1 (temperature)temp_incorroborated
OEM-B-9VTEC oil pressure switch (VTPSW)digital_inMAXXECUPRO-C3-A3DIN 6 (SWITCH)digital_incorroborated
OEM-E-1Immobilizer fuel pump relay (IMO FPR)low_side_outMAXXECUPRO-C1-D4GPO 3low_side_outcorroborated
OEM-E-14Fuel tank pressure sensor (FTP)analog_inMAXXECUPRO-C3-D1ANALOG IN 6 (0-5V)analog_incorroborated
OEM-E-15Electrical load detector (ELD)analog_inMAXXECUPRO-C3-D2ANALOG IN 7 (0-5V)analog_incorroborated
OEM-E-16Power steering pressure switch (PSPSW)digital_inMAXXECUPRO-C3-A4DIN 7 (SWITCH)digital_incorroborated
OEM-E-18A/C clutch relay (ACC)low_side_outMAXXECUPRO-C1-E4GPO 4low_side_outcorroborated
OEM-E-2Secondary heated O2 sensor (SHO2S)lambda_nb_inMAXXECUPRO-C1-J4AIN 4 (0-5V)analog_incorroborated
OEM-E-20Brake switch / interlock (2WBS)digital_inMAXXECUPRO-C4-D3DIN 8 (switch)digital_insingle_source
OEM-E-21Evap vent shut valve (VSV)low_side_outMAXXECUPRO-C4-H1GPO 27low_side_outcorroborated
OEM-E-22Brake switch (BKSW)digital_inMAXXECUPRO-C4-D4DIN 9 (switch)digital_incorroborated
OEM-E-23K-line (diagnostic)serial———single_source
OEM-E-24Multiplex communication (SEFMJ)serial———corroborated
OEM-E-26Engine speed pulse / tacho (NEP)tacho_outMAXXECUPRO-C4-H3GPO 29low_side_outcorroborated
OEM-E-27Immobilizer code (IMOCD)————single_source
OEM-E-29Service check signal (SCS)————single_source
OEM-E-3Logic ground 3 (LG3)groundMAXXECUPRO-C1-L4 + MAXXECUPRO-C2-H1 + MAXXECUPRO-C2-H2 + MAXXECUPRO-C2-H3 + MAXXECUPRO-C3-L4Engine GND + Engine ground 3 + Engine ground 3 + Engine ground 3 + ENGINE GROUND 2groundcorroborated
OEM-E-30Write enable signal (WEN)————single_source
OEM-E-31Malfunction indicator lamp (MIL)low_side_outMAXXECUPRO-C4-H2GPO 28low_side_outcorroborated
OEM-E-4Sensor ground 3 (SG3)sensor_groundMAXXECUPRO-C1-H1 + MAXXECUPRO-C1-H2 + MAXXECUPRO-C3-J2 + MAXXECUPRO-C3-J3Sensor GND + Trigger GND + SENSOR GND + SENSOR GNDsensor_groundcorroborated
OEM-E-5Sensor 5V supply 3 (VCC3)vrefMAXXECUPRO-C4-E3+5V sensor supply 3vrefcorroborated
OEM-E-6Secondary O2 heater control (SO2SHTC)low_side_outMAXXECUPRO-C1-D1WBO2 Heater-low_side_outcorroborated
OEM-E-7Main relay control (MRLY)low_side_outMAXXECUPRO-C1-B4GPO 1low_side_outcorroborated
OEM-E-8A/F sensor heater relay control (AFSHTCR)low_side_outMAXXECUPRO-C1-A1GPO 5low_side_outcorroborated
OEM-E-9Ignition switch signal (IG1)digital_inMAXXECUPRO-C3-K3KEY IN 12Vdigital_incorroborated

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-1MAXXECUPRO-C1-M40.85no route+12V ECU power supply—
W4SP-14V-1MAXXECUPRO-C3-M40.85no route12V ECU 2—
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-1MAXXECUPRO-C1-L40.85no routeEngine GND—
W11SP-GND-1MAXXECUPRO-C2-H10.85no routeEngine ground 3—
W12SP-GND-1MAXXECUPRO-C2-H20.85no routeEngine ground 3—
W13SP-GND-1MAXXECUPRO-C2-H30.85no routeEngine ground 3—
W14SP-GND-1MAXXECUPRO-C3-L40.85no routeENGINE GROUND 2—
W15OEM-A-10SP-0V-10.5no routeSensor ground 2 (SG2)—
W16OEM-A-11SP-0V-10.5no routeSensor ground 1 (SG1)—
W17OEM-E-4SP-0V-10.5no routeSensor ground 3 (SG3)—
W18SP-0V-1MAXXECUPRO-C1-H10.5no routeSensor GND—
W19SP-0V-1MAXXECUPRO-C1-H20.5no routeTrigger GND—
W20SP-0V-1MAXXECUPRO-C3-J20.5no routeSENSOR GND—
W21SP-0V-1MAXXECUPRO-C3-J30.5no routeSENSOR GND—
W22OEM-A-20MAXXECUPRO-C1-G10.5no routeSensor 5V supply 2 (VCC2)—
W23OEM-A-21MAXXECUPRO-C3-C20.5no routeSensor 5V supply 1 (VCC1)—
W24OEM-E-5MAXXECUPRO-C4-E30.5no routeSensor 5V supply 3 (VCC3)—
W25OEM-A-7MAXXECUPRO-C1-H30.5no routeCrank position sensor (CKP)—
W26OEM-A-25MAXXECUPRO-C1-H40.5no routeCamshaft position A (CMP A)—
W27OEM-A-9MAXXECUPRO-C4-F20.5no routeKnock sensor (KS)—
W28OEM-A-30MAXXECUPRO-C1-A20.5no routeIgnition coil 1 (IGPLS1)—
W29OEM-A-29MAXXECUPRO-C1-A30.5no routeIgnition coil 2 (IGPLS2)—
W30OEM-A-28MAXXECUPRO-C1-B20.5no routeIgnition coil 3 (IGPLS3)—
W31OEM-A-27MAXXECUPRO-C1-B30.5no routeIgnition coil 4 (IGPLS4)—
W32OEM-B-5MAXXECUPRO-C1-K10.5no routeInjector 1 (INJ1)—
W33OEM-B-4MAXXECUPRO-C1-K20.5no routeInjector 2 (INJ2)—
W34OEM-B-3MAXXECUPRO-C1-M10.5no routeInjector 3 (INJ3)—
W35OEM-B-2MAXXECUPRO-C1-M20.5no routeInjector 4 (INJ4)—
W36OEM-E-9MAXXECUPRO-C3-K30.5no routeIgnition switch signal (IG1)—
W37OEM-E-7MAXXECUPRO-C1-B40.5no routeMain relay control (MRLY)—
W38OEM-B-6MAXXECUPRO-C1-C40.5no routeRadiator fan control (FANC)—
W39OEM-E-1MAXXECUPRO-C1-D40.5no routeImmobilizer fuel pump relay (IMO FPR)—
W40OEM-E-18MAXXECUPRO-C1-E40.5no routeA/C clutch relay (ACC)—
W41OEM-E-8MAXXECUPRO-C1-A10.5no routeA/F sensor heater relay control (AFSHTCR)—
W42OEM-E-6MAXXECUPRO-C1-D10.5no routeSecondary O2 heater control (SO2SHTC)—
W43OEM-A-1MAXXECUPRO-C3-E10.5no routeA/F sensor heater control (AFSHTC)—
W44OEM-A-12MAXXECUPRO-C1-B10.5no routeIdle air control valve (IACV)—
W45OEM-B-15MAXXECUPRO-C1-C10.5no routeVTEC solenoid (VTS)—
W46OEM-B-1MAXXECUPRO-C1-A40.5no routeVTC oil control solenoid (+)—
W47OEM-B-18MAXXECUPRO-C4-G10.5no routeAlternator control (ALTC)—
W48OEM-B-21MAXXECUPRO-C4-G20.5no routeEvap canister purge valve (PCS)—
W49OEM-B-23MAXXECUPRO-C4-G30.5no routeVTC oil control solenoid (-)—
W50OEM-B-7MAXXECUPRO-C4-G40.5no routeReverse lockout solenoid (RVS, Type-S)—
W51OEM-E-21MAXXECUPRO-C4-H10.5no routeEvap vent shut valve (VSV)—
W52OEM-E-31MAXXECUPRO-C4-H20.5no routeMalfunction indicator lamp (MIL)—
W53OEM-E-26MAXXECUPRO-C4-H30.5no routeEngine speed pulse / tacho (NEP)—
W54OEM-A-6MAXXECUPRO-C1-G30.5no routeA/F sensor + (AFS+, wideband Ip)—
W55OEM-A-16MAXXECUPRO-C1-F40.5no routeA/F sensor - (AFS-, wideband Vs)—
W56OEM-A-19MAXXECUPRO-C1-J30.5no routeManifold absolute pressure (MAP)—
W57OEM-A-15MAXXECUPRO-C1-G20.5no routeThrottle position sensor (TPS)—
W58OEM-E-2MAXXECUPRO-C1-J40.5no routeSecondary heated O2 sensor (SHO2S)—
W59OEM-B-8MAXXECUPRO-C1-J10.5no routeCoolant temp sensor (ECT)—
W60OEM-B-17MAXXECUPRO-C1-J20.5no routeIntake air temp sensor (IAT)—
W61OEM-B-13MAXXECUPRO-C3-C30.5no routeAlternator FR signal (ALTF)—
W62OEM-E-14MAXXECUPRO-C3-D10.5no routeFuel tank pressure sensor (FTP)—
W63OEM-E-15MAXXECUPRO-C3-D20.5no routeElectrical load detector (ELD)—
W64OEM-A-18MAXXECUPRO-C1-K30.5no routeVehicle speed sensor (VSS, M/T)—
W65OEM-B-10MAXXECUPRO-C1-K40.5no routeAlternator L signal (ALTL)—
W66OEM-B-9MAXXECUPRO-C3-A30.5no routeVTEC oil pressure switch (VTPSW)—
W67OEM-E-16MAXXECUPRO-C3-A40.5no routePower steering pressure switch (PSPSW)—
W68OEM-E-20MAXXECUPRO-C4-D30.5no routeBrake switch / interlock (2WBS)—
W69OEM-E-22MAXXECUPRO-C4-D40.5no 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

ECU setup sheet

RoleEngine refEngine signalSensorECU pointECU functionECU classSetup flag
No configured channels.

Findings

Open (13)

SeverityCodeSubjectMessage
errorREQUIRED_UNMAPPEDOEM-A-26Required OEM function "Camshaft position B (CMP B)" (trigger_in) is not connected to the new ECU.
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_UNKNOWNMAXXECUPRO-C1-A1MAXXECUPRO-C1-A1 "GPO 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_UNKNOWNMAXXECUPRO-C1-B1MAXXECUPRO-C1-B1 "GPO 6" drives OEM-A-12 Idle air control valve (IACV) (load 1.0 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNMAXXECUPRO-C1-B4MAXXECUPRO-C1-B4 "GPO 1" drives OEM-E-7 Main relay control (MRLY) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNMAXXECUPRO-C1-C1MAXXECUPRO-C1-C1 "GPO 7" drives OEM-B-15 VTEC solenoid (VTS) (load 1.0 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNMAXXECUPRO-C1-C4MAXXECUPRO-C1-C4 "GPO 2" drives OEM-B-6 Radiator fan control (FANC) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
warnLOAD_UNKNOWNMAXXECUPRO-C1-D4MAXXECUPRO-C1-D4 "GPO 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_UNKNOWNMAXXECUPRO-C1-E4MAXXECUPRO-C1-E4 "GPO 4" drives OEM-E-18 A/C clutch relay (ACC) (load 0.2 A) but its current rating is unknown. Check the ECU manual.
infoNET_FAMILYOEM-E-26 ↔ MAXXECUPRO-C4-H3OEM-E-26 "Engine speed pulse / tacho (NEP)" [tacho_out] is wired to MAXXECUPRO-C4-H3 "GPO 29" [low_side_out]. Tacho as a low-side output: check the tach needs a pull-up.
infoUNMAPPEDOEM6 optional OEM pins are not mapped: OEM-A-22 A/F sensor heater supply (AFSHTC+); OEM-E-23 K-line (diagnostic); OEM-E-24 Multiplex communication (SEFMJ); OEM-E-27 Immobilizer code (IMOCD); OEM-E-29 Service check signal (SCS); OEM-E-30 Write enable signal (WEN)

Accepted (0)

CodeSubjectReasonBy

Notes

Auto-mapped by auto_map() from the library pin data on 2026-10-04. Review every wire against both manuals before building. Open items: - OEM-A 26: Camshaft position B (CMP B): no free cam_vr/cam_hall/frequency_in input on MaxxECU MaxxECU PRO Not wired: - OEM-A 22: A/F sensor heater supply (AFSHTC+): no free heater_feed on MaxxECU MaxxECU PRO - OEM-E 23: K-line (diagnostic): no free k_line on MaxxECU MaxxECU PRO - OEM-E 24: Multiplex communication (SEFMJ): no free k_line on MaxxECU MaxxECU PRO - 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

ReliabilityKindTitleURL
4vendor_docLink: CIVICLink K20X (HC20X) DC5 installation manualhttps://linkecu.com/documentation/237-4000%20DC5.pdf
4vendor_docMaxxECU GEN1 pinout (MINI / STREET / SPORT / V1 / RACE / PRO)http://www.maxxecu.com/webhelp/wirings-maxxecu_pinout.html
3forumFFS TechNet: K-series 02-06 RSX ECU pin diagram (Helm)https://ff-squad.com/technet2/k-series-02-06-rsx-ecu-pin-diagram/