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RSX Type-S 2002-04 (K20A2) → AMP EFI MS3Pro Mini (auto)

RSX Type-S 2002-04 (K20A2) — AMP EFI — MS3Pro Mini
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-08

Before you start

Statusproposal · not yet verified: nobody has reported building and running this harness
Open errorsnone
Size of the job45 wires · 8 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-1MS3PROMINI-A-10.85☐☐☐☐☐☐☐
W4OEM-A-23SP-GND-10.85☐☐☐☐☐☐☐
W5OEM-A-24SP-GND-10.85☐☐☐☐☐☐☐
W6OEM-A-4SP-GND-10.85☐☐☐☐☐☐☐
W7OEM-A-5SP-GND-10.85☐☐☐☐☐☐☐
W8OEM-E-3SP-GND-10.85☐☐☐☐☐☐☐
W9SP-GND-1MS3PROMINI-A-220.85☐☐☐☐☐☐☐
W10SP-GND-1MS3PROMINI-A-230.85☐☐☐☐☐☐☐
W11OEM-A-10SP-0V-10.5☐☐☐☐☐☐☐
W12OEM-A-11SP-0V-10.5☐☐☐☐☐☐☐
W13OEM-E-4SP-0V-10.5☐☐☐☐☐☐☐
W14SP-0V-1MS3PROMINI-A-210.5☐☐☐☐☐☐☐
W15OEM-A-20SP-5V1-10.5☐☐☐☐☐☐☐
W16OEM-A-21SP-5V1-10.5☐☐☐☐☐☐☐
W17OEM-E-5SP-5V1-10.5☐☐☐☐☐☐☐
W18SP-5V1-1MS3PROMINI-A-20.5☐☐☐☐☐☐☐
W19OEM-A-7MS3PROMINI-A-300.5☐☐☐☐☐☐☐
W20OEM-A-25MS3PROMINI-A-320.5☐☐☐☐☐☐☐
W21OEM-A-26MS3PROMINI-A-330.5☐☐☐☐☐☐☐
W22OEM-A-30MS3PROMINI-A-170.5☐☐☐☐☐☐☐
W23OEM-A-29MS3PROMINI-A-180.5☐☐☐☐☐☐☐
W24OEM-A-28MS3PROMINI-A-190.5☐☐☐☐☐☐☐
W25OEM-A-27MS3PROMINI-A-200.5☐☐☐☐☐☐☐
W26OEM-B-5MS3PROMINI-A-100.5☐☐☐☐☐☐☐
W27OEM-B-4MS3PROMINI-A-110.5☐☐☐☐☐☐☐
W28OEM-B-3MS3PROMINI-A-120.5☐☐☐☐☐☐☐
W29OEM-B-2MS3PROMINI-A-50.5☐☐☐☐☐☐☐
W30OEM-E-7MS3PROMINI-A-40.5☐☐☐☐☐☐☐
W31OEM-B-6MS3PROMINI-A-30.5☐☐☐☐☐☐☐
W32OEM-E-1MS3PROMINI-A-60.5☐☐☐☐☐☐☐
W33OEM-E-18MS3PROMINI-A-70.5☐☐☐☐☐☐☐
W34OEM-E-8MS3PROMINI-A-80.5☐☐☐☐☐☐☐
W35OEM-A-12MS3PROMINI-A-90.5☐☐☐☐☐☐☐
W36OEM-A-19MS3PROMINI-A-130.5☐☐☐☐☐☐☐
W37OEM-A-15MS3PROMINI-A-280.5☐☐☐☐☐☐☐
W38OEM-E-2MS3PROMINI-A-140.5☐☐☐☐☐☐☐
W39OEM-B-8MS3PROMINI-A-260.5☐☐☐☐☐☐☐
W40OEM-B-17MS3PROMINI-A-270.5☐☐☐☐☐☐☐
W41OEM-B-13MS3PROMINI-A-150.5☐☐☐☐☐☐☐
W42OEM-E-14MS3PROMINI-A-160.5☐☐☐☐☐☐☐
W43OEM-A-18MS3PROMINI-A-340.5☐☐☐☐☐☐☐
W44OEM-B-10MS3PROMINI-A-290.5☐☐☐☐☐☐☐
W45OEM-B-9MS3PROMINI-A-350.5☐☐☐☐☐☐☐

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
1MS3PROMINI-A-1MS3PROMINI-A-21open (OL)+12 V supply must not touch sensor ground
2MS3PROMINI-A-1MS3PROMINI-A-22open (OL)+12 V supply must not touch power ground
3MS3PROMINI-A-1MS3PROMINI-A-2open (OL)+12 V supply must not touch 5 V sensor reference
4MS3PROMINI-A-21MS3PROMINI-A-2open (OL)sensor ground must not touch 5 V sensor reference
5MS3PROMINI-A-22MS3PROMINI-A-2open (OL)power ground must not touch 5 V sensor reference

Revisions

RevLabelByDate
No revisions yet.

Schematic

MS3PROMINI-AOEM-AOEM-BOEM-ESP-0VSP-14VSP-5V1SP-GND

Connectors

MS3PROMINI-A

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
112V+ switched power in—W3—0.85SP-14V-1———
10Injector out F—W26—0.5OEM-B-5———
11Injector out G—W27—0.5OEM-B-4———
12Injector out H—W28—0.5OEM-B-3———
13Analog in 1—W36—0.5OEM-A-19———
14Analog in 2—W38—0.5OEM-E-2———
15Analog in 3—W41—0.5OEM-B-13———
16Analog in 4—W42—0.5OEM-E-14———
17Spark out A—W22—0.5OEM-A-30———
18Spark out B—W23—0.5OEM-A-29———
19Spark out C—W24—0.5OEM-A-28———
2+5V VREF out—W18—0.5SP-5V1-1———
20Spark out D—W25—0.5OEM-A-27———
21Sensor ground—W14—0.5SP-0V-1———
22Power ground—W9—0.85SP-GND-1———
23Power ground—W10—0.85SP-GND-1———
24CAN Low————————
25CAN High————————
26CLT in—W39—0.5OEM-B-8———
27IAT in—W40—0.5OEM-B-17———
28TPS in—W37—0.5OEM-A-15———
29Digital switched in 1 / Flex fuel—W44—0.5OEM-B-10———
3PWM out 1 / Idle—W31—0.5OEM-B-6———
30CKP+—W19—0.5OEM-A-7———
31CKP-————————
32CMP+—W20—0.5OEM-A-25———
33CMP-—W21—0.5OEM-A-26———
34Digital frequency in 1 (Hall)—W43—0.5OEM-A-18———
35Digital frequency in 2 (Hall)—W45—0.5OEM-B-9———
4Fuel pump out—W30—0.5OEM-E-7———
5Injector out A—W29—0.5OEM-B-2———
6Injector out B—W32—0.5OEM-E-1———
7Injector out C—W33—0.5OEM-E-18———
8Injector out D—W34—0.5OEM-E-8———
9Injector out E—W35—0.5OEM-A-12———

OEM-A

Mating face
Wire side
CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1A/F sensor heater control (AFSHTC)————————
2Ignition power 2 (IGP2)—W1—0.85SP-14V-1———
3Ignition power 1 (IGP1)—W2—0.85SP-14V-1———
4Power ground 2 (PG2)—W6—0.85SP-GND-1———
5Power ground 1 (PG1)—W7—0.85SP-GND-1———
6A/F sensor + (AFS+, wideband Ip)————————
7Crank position sensor (CKP)—W19—0.5MS3PROMINI-A-30———
8—————————
9Knock sensor (KS)————————
10Sensor ground 2 (SG2)—W11—0.5SP-0V-1———
11Sensor ground 1 (SG1)—W12—0.5SP-0V-1———
12Idle air control valve (IACV)—W35—0.5MS3PROMINI-A-9———
13—————————
14—————————
15Throttle position sensor (TPS)—W37—0.5MS3PROMINI-A-28———
16A/F sensor - (AFS-, wideband Vs)————————
17—————————
18Vehicle speed sensor (VSS, M/T)—W43—0.5MS3PROMINI-A-34———
19Manifold absolute pressure (MAP)—W36—0.5MS3PROMINI-A-13———
20Sensor 5V supply 2 (VCC2)—W15—0.5SP-5V1-1———
21Sensor 5V supply 1 (VCC1)—W16—0.5SP-5V1-1———
22A/F sensor heater supply (AFSHTC+)————————
23Logic ground 2 (LG2)—W4—0.85SP-GND-1———
24Logic ground 1 (LG1)—W5—0.85SP-GND-1———
25Camshaft position A (CMP A)—W20—0.5MS3PROMINI-A-32———
26Camshaft position B (CMP B)—W21—0.5MS3PROMINI-A-33———
27Ignition coil 4 (IGPLS4)—W25—0.5MS3PROMINI-A-20———
28Ignition coil 3 (IGPLS3)—W24—0.5MS3PROMINI-A-19———
29Ignition coil 2 (IGPLS2)—W23—0.5MS3PROMINI-A-18———
30Ignition coil 1 (IGPLS1)—W22—0.5MS3PROMINI-A-17———
31—————————

OEM-B

Mating face
Wire side
CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1VTC oil control solenoid (+)————————
2Injector 4 (INJ4)—W29—0.5MS3PROMINI-A-5———
3Injector 3 (INJ3)—W28—0.5MS3PROMINI-A-12———
4Injector 2 (INJ2)—W27—0.5MS3PROMINI-A-11———
5Injector 1 (INJ1)—W26—0.5MS3PROMINI-A-10———
6Radiator fan control (FANC)—W31—0.5MS3PROMINI-A-3———
7Reverse lockout solenoid (RVS, Type-S)————————
8Coolant temp sensor (ECT)—W39—0.5MS3PROMINI-A-26———
9VTEC oil pressure switch (VTPSW)—W45—0.5MS3PROMINI-A-35———
10Alternator L signal (ALTL)—W44—0.5MS3PROMINI-A-29———
11—————————
12—————————
13Alternator FR signal (ALTF)—W41—0.5MS3PROMINI-A-15———
14—————————
15VTEC solenoid (VTS)————————
16—————————
17Intake air temp sensor (IAT)—W40—0.5MS3PROMINI-A-27———
18Alternator control (ALTC)————————
19—————————
20—————————
21Evap canister purge valve (PCS)————————
22—————————
23VTC oil control solenoid (-)————————
24—————————

OEM-E

Mating face
Wire side
CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Immobilizer fuel pump relay (IMO FPR)—W32—0.5MS3PROMINI-A-6———
2Secondary heated O2 sensor (SHO2S)—W38—0.5MS3PROMINI-A-14———
3Logic ground 3 (LG3)—W8—0.85SP-GND-1———
4Sensor ground 3 (SG3)—W13—0.5SP-0V-1———
5Sensor 5V supply 3 (VCC3)—W17—0.5SP-5V1-1———
6Secondary O2 heater control (SO2SHTC)————————
7Main relay control (MRLY)—W30—0.5MS3PROMINI-A-4———
8A/F sensor heater relay control (AFSHTCR)—W34—0.5MS3PROMINI-A-8———
9Ignition switch signal (IG1)————————
10—————————
11—————————
12—————————
13—————————
14Fuel tank pressure sensor (FTP)—W42—0.5MS3PROMINI-A-16———
15Electrical load detector (ELD)————————
16Power steering pressure switch (PSPSW)————————
17—————————
18A/C clutch relay (ACC)—W33—0.5MS3PROMINI-A-7———
19—————————
20Brake switch / interlock (2WBS)————————
21Evap vent shut valve (VSV)————————
22Brake switch (BKSW)————————
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——W11—0.5OEM-A-10———
1——W12—0.5OEM-A-11———
1——W13—0.5OEM-E-4———
1——W14—0.5MS3PROMINI-A-21———

SP-14V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W2—0.85OEM-A-3———
1——W1—0.85OEM-A-2———
1——W3—0.85MS3PROMINI-A-1———

SP-5V1

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W15—0.5OEM-A-20———
1——W16—0.5OEM-A-21———
1——W17—0.5OEM-E-5———
1——W18—0.5MS3PROMINI-A-2———

SP-GND

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W4—0.85OEM-A-23———
1——W5—0.85OEM-A-24———
1——W6—0.85OEM-A-4———
1——W7—0.85OEM-A-5———
1——W8—0.85OEM-E-3———
1——W9—0.85MS3PROMINI-A-22———
1——W10—0.85MS3PROMINI-A-23———

Pin map

OEM pointOEM functionOEM familyTarget pointTarget functionTarget familyWire colourEvidence
OEM-A-1A/F sensor heater control (AFSHTC)low_side_out———single_source
OEM-A-10Sensor ground 2 (SG2)sensor_groundMS3PROMINI-A-21Sensor groundsensor_groundcorroborated
OEM-A-11Sensor ground 1 (SG1)sensor_groundMS3PROMINI-A-21Sensor groundsensor_groundcorroborated
OEM-A-12Idle air control valve (IACV)low_side_outMS3PROMINI-A-9Injector out Einjector_outcorroborated
OEM-A-15Throttle position sensor (TPS)analog_inMS3PROMINI-A-28TPS inanalog_incorroborated
OEM-A-16A/F sensor - (AFS-, wideband Vs)wb_vs———single_source
OEM-A-18Vehicle speed sensor (VSS, M/T)digital_inMS3PROMINI-A-34Digital frequency in 1 (Hall)digital_incorroborated
OEM-A-19Manifold absolute pressure (MAP)analog_inMS3PROMINI-A-13Analog in 1analog_incorroborated
OEM-A-2Ignition power 2 (IGP2)power_inMS3PROMINI-A-112V+ switched power inpower_incorroborated
OEM-A-20Sensor 5V supply 2 (VCC2)vrefMS3PROMINI-A-2+5V VREF outvrefcorroborated
OEM-A-21Sensor 5V supply 1 (VCC1)vrefMS3PROMINI-A-2+5V VREF outvrefcorroborated
OEM-A-22A/F sensor heater supply (AFSHTC+)power_out———single_source
OEM-A-23Logic ground 2 (LG2)groundMS3PROMINI-A-22 + MS3PROMINI-A-23Power ground + Power groundgroundcorroborated
OEM-A-24Logic ground 1 (LG1)groundMS3PROMINI-A-22 + MS3PROMINI-A-23Power ground + Power groundgroundcorroborated
OEM-A-25Camshaft position A (CMP A)trigger_inMS3PROMINI-A-32CMP+trigger_insingle_source
OEM-A-26Camshaft position B (CMP B)trigger_inMS3PROMINI-A-33CMP-trigger_insingle_source
OEM-A-27Ignition coil 4 (IGPLS4)ignition_outMS3PROMINI-A-20Spark out Dignition_outcorroborated
OEM-A-28Ignition coil 3 (IGPLS3)ignition_outMS3PROMINI-A-19Spark out Cignition_outcorroborated
OEM-A-29Ignition coil 2 (IGPLS2)ignition_outMS3PROMINI-A-18Spark out Bignition_outcorroborated
OEM-A-3Ignition power 1 (IGP1)power_inMS3PROMINI-A-112V+ switched power inpower_incorroborated
OEM-A-30Ignition coil 1 (IGPLS1)ignition_outMS3PROMINI-A-17Spark out Aignition_outcorroborated
OEM-A-4Power ground 2 (PG2)groundMS3PROMINI-A-22 + MS3PROMINI-A-23Power ground + Power groundgroundcorroborated
OEM-A-5Power ground 1 (PG1)groundMS3PROMINI-A-22 + MS3PROMINI-A-23Power ground + Power groundgroundcorroborated
OEM-A-6A/F sensor + (AFS+, wideband Ip)wb_ip———single_source
OEM-A-7Crank position sensor (CKP)trigger_inMS3PROMINI-A-30CKP+trigger_incorroborated
OEM-A-9Knock sensor (KS)knock_in———corroborated
OEM-B-1VTC oil control solenoid (+)low_side_out———corroborated
OEM-B-10Alternator L signal (ALTL)digital_inMS3PROMINI-A-29Digital switched in 1 / Flex fueldigital_insingle_source
OEM-B-13Alternator FR signal (ALTF)analog_inMS3PROMINI-A-15Analog in 3analog_insingle_source
OEM-B-15VTEC solenoid (VTS)low_side_out———single_source
OEM-B-17Intake air temp sensor (IAT)temp_inMS3PROMINI-A-27IAT intemp_incorroborated
OEM-B-18Alternator control (ALTC)low_side_out———corroborated
OEM-B-2Injector 4 (INJ4)injector_outMS3PROMINI-A-5Injector out Ainjector_outcorroborated
OEM-B-21Evap canister purge valve (PCS)low_side_out———corroborated
OEM-B-23VTC oil control solenoid (-)low_side_out———corroborated
OEM-B-3Injector 3 (INJ3)injector_outMS3PROMINI-A-12Injector out Hinjector_outcorroborated
OEM-B-4Injector 2 (INJ2)injector_outMS3PROMINI-A-11Injector out Ginjector_outcorroborated
OEM-B-5Injector 1 (INJ1)injector_outMS3PROMINI-A-10Injector out Finjector_outcorroborated
OEM-B-6Radiator fan control (FANC)low_side_outMS3PROMINI-A-3PWM out 1 / Idlelow_side_outcorroborated
OEM-B-7Reverse lockout solenoid (RVS, Type-S)low_side_out———corroborated
OEM-B-8Coolant temp sensor (ECT)temp_inMS3PROMINI-A-26CLT intemp_incorroborated
OEM-B-9VTEC oil pressure switch (VTPSW)digital_inMS3PROMINI-A-35Digital frequency in 2 (Hall)digital_incorroborated
OEM-E-1Immobilizer fuel pump relay (IMO FPR)low_side_outMS3PROMINI-A-6Injector out Binjector_outcorroborated
OEM-E-14Fuel tank pressure sensor (FTP)analog_inMS3PROMINI-A-16Analog in 4analog_incorroborated
OEM-E-15Electrical load detector (ELD)analog_in———corroborated
OEM-E-16Power steering pressure switch (PSPSW)digital_in———corroborated
OEM-E-18A/C clutch relay (ACC)low_side_outMS3PROMINI-A-7Injector out Cinjector_outcorroborated
OEM-E-2Secondary heated O2 sensor (SHO2S)lambda_nb_inMS3PROMINI-A-14Analog in 2analog_incorroborated
OEM-E-20Brake switch / interlock (2WBS)digital_in———single_source
OEM-E-21Evap vent shut valve (VSV)low_side_out———corroborated
OEM-E-22Brake switch (BKSW)digital_in———corroborated
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)groundMS3PROMINI-A-22 + MS3PROMINI-A-23Power ground + Power 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_groundMS3PROMINI-A-21Sensor groundsensor_groundcorroborated
OEM-E-5Sensor 5V supply 3 (VCC3)vrefMS3PROMINI-A-2+5V VREF outvrefcorroborated
OEM-E-6Secondary O2 heater control (SO2SHTC)low_side_out———corroborated
OEM-E-7Main relay control (MRLY)low_side_outMS3PROMINI-A-4Fuel pump outlow_side_outcorroborated
OEM-E-8A/F sensor heater relay control (AFSHTCR)low_side_outMS3PROMINI-A-8Injector out Dinjector_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-1MS3PROMINI-A-10.85no route12V+ switched power in—
W4OEM-A-23SP-GND-10.85no routeLogic ground 2 (LG2)—
W5OEM-A-24SP-GND-10.85no routeLogic ground 1 (LG1)—
W6OEM-A-4SP-GND-10.85no routePower ground 2 (PG2)—
W7OEM-A-5SP-GND-10.85no routePower ground 1 (PG1)—
W8OEM-E-3SP-GND-10.85no routeLogic ground 3 (LG3)—
W9SP-GND-1MS3PROMINI-A-220.85no routePower ground—
W10SP-GND-1MS3PROMINI-A-230.85no routePower ground—
W11OEM-A-10SP-0V-10.5no routeSensor ground 2 (SG2)—
W12OEM-A-11SP-0V-10.5no routeSensor ground 1 (SG1)—
W13OEM-E-4SP-0V-10.5no routeSensor ground 3 (SG3)—
W14SP-0V-1MS3PROMINI-A-210.5no routeSensor ground—
W15OEM-A-20SP-5V1-10.5no routeSensor 5V supply 2 (VCC2)—
W16OEM-A-21SP-5V1-10.5no routeSensor 5V supply 1 (VCC1)—
W17OEM-E-5SP-5V1-10.5no routeSensor 5V supply 3 (VCC3)—
W18SP-5V1-1MS3PROMINI-A-20.5no route+5V VREF out—
W19OEM-A-7MS3PROMINI-A-300.5no routeCrank position sensor (CKP)—
W20OEM-A-25MS3PROMINI-A-320.5no routeCamshaft position A (CMP A)—
W21OEM-A-26MS3PROMINI-A-330.5no routeCamshaft position B (CMP B)—
W22OEM-A-30MS3PROMINI-A-170.5no routeIgnition coil 1 (IGPLS1)—
W23OEM-A-29MS3PROMINI-A-180.5no routeIgnition coil 2 (IGPLS2)—
W24OEM-A-28MS3PROMINI-A-190.5no routeIgnition coil 3 (IGPLS3)—
W25OEM-A-27MS3PROMINI-A-200.5no routeIgnition coil 4 (IGPLS4)—
W26OEM-B-5MS3PROMINI-A-100.5no routeInjector 1 (INJ1)—
W27OEM-B-4MS3PROMINI-A-110.5no routeInjector 2 (INJ2)—
W28OEM-B-3MS3PROMINI-A-120.5no routeInjector 3 (INJ3)—
W29OEM-B-2MS3PROMINI-A-50.5no routeInjector 4 (INJ4)—
W30OEM-E-7MS3PROMINI-A-40.5no routeMain relay control (MRLY)—
W31OEM-B-6MS3PROMINI-A-30.5no routeRadiator fan control (FANC)—
W32OEM-E-1MS3PROMINI-A-60.5no routeImmobilizer fuel pump relay (IMO FPR)—
W33OEM-E-18MS3PROMINI-A-70.5no routeA/C clutch relay (ACC)—
W34OEM-E-8MS3PROMINI-A-80.5no routeA/F sensor heater relay control (AFSHTCR)—
W35OEM-A-12MS3PROMINI-A-90.5no routeIdle air control valve (IACV)—
W36OEM-A-19MS3PROMINI-A-130.5no routeManifold absolute pressure (MAP)—
W37OEM-A-15MS3PROMINI-A-280.5no routeThrottle position sensor (TPS)—
W38OEM-E-2MS3PROMINI-A-140.5no routeSecondary heated O2 sensor (SHO2S)—
W39OEM-B-8MS3PROMINI-A-260.5no routeCoolant temp sensor (ECT)—
W40OEM-B-17MS3PROMINI-A-270.5no routeIntake air temp sensor (IAT)—
W41OEM-B-13MS3PROMINI-A-150.5no routeAlternator FR signal (ALTF)—
W42OEM-E-14MS3PROMINI-A-160.5no routeFuel tank pressure sensor (FTP)—
W43OEM-A-18MS3PROMINI-A-340.5no routeVehicle speed sensor (VSS, M/T)—
W44OEM-B-10MS3PROMINI-A-290.5no routeAlternator L signal (ALTL)—
W45OEM-B-9MS3PROMINI-A-350.5no routeVTEC oil pressure switch (VTPSW)—

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)40.000ea

ECU setup sheet

RoleEngine refEngine signalSensorECU pointECU functionECU classSetup flag
No configured channels.

Findings

Open (9)

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.
warnSUPPLY_GROUPMS3PROMINI-A-2 + 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-12 ↔ MS3PROMINI-A-9OEM-A-12 "Idle air control valve (IACV)" [low_side_out] is wired to MS3PROMINI-A-9 "Injector out E" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-E-1 ↔ MS3PROMINI-A-6OEM-E-1 "Immobilizer fuel pump relay (IMO FPR)" [low_side_out] is wired to MS3PROMINI-A-6 "Injector out B" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-E-18 ↔ MS3PROMINI-A-7OEM-E-18 "A/C clutch relay (ACC)" [low_side_out] is wired to MS3PROMINI-A-7 "Injector out C" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-E-8 ↔ MS3PROMINI-A-8OEM-E-8 "A/F sensor heater relay control (AFSHTCR)" [low_side_out] is wired to MS3PROMINI-A-8 "Injector out D" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoUNMAPPEDOEM25 optional OEM pins are not mapped: OEM-A-1 A/F sensor heater control (AFSHTC); 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-A-9 Knock sensor (KS); OEM-B-1 VTC oil control solenoid (+); OEM-B-15 VTEC solenoid (VTS); OEM-B-18 Alternator control (ALTC); OEM-B-21 Evap canister purge valve (PCS); OEM-B-23 VTC oil control solenoid (-); OEM-B-7 Reverse lockout solenoid (RVS, Type-S); OEM-E-15 Electrical load detector (ELD); OEM-E-16 Power steering pressure switch (PSPSW); OEM-E-20 Brake switch / interlock (2WBS); OEM-E-21 Evap vent shut valve (VSV); OEM-E-22 Brake switch (BKSW); 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-6 Secondary O2 heater control (SO2SHTC); OEM-E-9 Ignition switch signal (IG1)

Accepted (0)

CodeSubjectReasonBy

Notes

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-A 9: Knock sensor (KS): no free knock input on AMP EFI MS3Pro Mini - 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); AMP EFI MS3Pro Mini has no dedicated key-on input - OEM-E 6: Secondary O2 heater control (SO2SHTC): no free heater_low_side/low_side/ls_hs/hbridge on AMP EFI MS3Pro Mini - OEM-A 1: A/F sensor heater control (AFSHTC): no free heater_low_side/low_side/ls_hs/hbridge on AMP EFI MS3Pro Mini - OEM-B 15: VTEC solenoid (VTS): no free low_side/ls_hs/injector/hbridge rated ≥ 1.0 A on AMP EFI MS3Pro Mini - OEM-B 1: VTC oil control solenoid (+): no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-B 18: Alternator control (ALTC): no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-B 21: Evap canister purge valve (PCS): no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-B 23: VTC oil control solenoid (-): no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-B 7: Reverse lockout solenoid (RVS, Type-S): no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-E 21: Evap vent shut valve (VSV): no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-E 31: Malfunction indicator lamp (MIL): no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-E 26: Engine speed pulse / tacho (NEP): no free tacho/frequency_out/low_side/ls_hs on AMP EFI MS3Pro Mini - OEM-A 6: A/F sensor + (AFS+, wideband Ip): no free wb_ip on AMP EFI MS3Pro Mini - OEM-A 16: A/F sensor - (AFS-, wideband Vs): no free wb_vs on AMP EFI MS3Pro Mini - OEM-A 22: A/F sensor heater supply (AFSHTC+): no free heater_feed on AMP EFI MS3Pro Mini - OEM-E 15: Electrical load detector (ELD): no free analog_0_5 on AMP EFI MS3Pro Mini - OEM-E 16: Power steering pressure switch (PSPSW): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E 20: Brake switch / interlock (2WBS): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E 22: Brake switch (BKSW): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-E 23: K-line (diagnostic): no free k_line on AMP EFI MS3Pro Mini - OEM-E 24: Multiplex communication (SEFMJ): no free k_line on AMP EFI MS3Pro Mini - 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_docAMP EFI: MS3Pro Mini manual (fw 1.6.1) pinout & output ratingshttps://cdn.shopify.com/s/files/1/0960/0014/7754/files/MS3Pro_User_Manual_Firmware_1.6.1_Mini.pdf?v=1760643335archive2026-10-05bed7d8ae8408
4vendor_docLink: CIVICLink K20X (HC20X) DC5 installation manualhttps://linkecu.com/documentation/237-4000%20DC5.pdfarchive2026-10-058a1a71301571
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