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MX-5 Miata NB2 2001-05 (BP-Z3, VVT) → Emtron KV8 (auto)

MX-5 Miata NB2 2001-05 (BP-Z3, VVT) — Emtron — KV8
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 job61 wires · 10 connectors · 5 part lines
ToolsCrimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink
Terminals3-1447221-4
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-2-PSP-14V-10.85☐☐☐☐☐☐☐
W2OEM-4-AFSP-14V-10.85☐☐☐☐☐☐☐
W3SP-14V-1KV8-D-10.85☐☐☐☐☐☐☐
W4SP-14V-1KV8-D-20.85☐☐☐☐☐☐☐
W5SP-14V-1KV8-D-200.85☐☐☐☐☐☐☐
W6OEM-3-ASP-GND-10.85☐☐☐☐☐☐☐
W7OEM-3-BSP-GND-10.85☐☐☐☐☐☐☐
W8OEM-4-ASP-GND-10.85☐☐☐☐☐☐☐
W9SP-GND-1KV8-B-340.85☐☐☐☐☐☐☐
W10SP-GND-1KV8-B-90.85☐☐☐☐☐☐☐
W11SP-GND-1KV8-C-10.85☐☐☐☐☐☐☐
W12SP-GND-1KV8-C-260.85☐☐☐☐☐☐☐
W13OEM-4-OSP-0V-10.5☐☐☐☐☐☐☐
W14SP-0V-1KV8-C-170.5☐☐☐☐☐☐☐
W15SP-0V-1KV8-C-250.5☐☐☐☐☐☐☐
W16OEM-4-LKV8-D-210.5☐☐☐☐☐☐☐
W17OEM-3-YKV8-D-40.5☐☐☐☐☐☐☐
W18SP-0V-1KV8-D-50.5☐☐☐☐☐☐☐
W19OEM-3-VKV8-D-60.5☐☐☐☐☐☐☐
W20SP-0V-1KV8-D-70.5☐☐☐☐☐☐☐
W21OEM-4-MKV8-D-110.5☐☐☐☐☐☐☐
W22OEM-3-FKV8-B-260.5☐☐☐☐☐☐☐
W23OEM-3-IKV8-B-270.5☐☐☐☐☐☐☐
W24OEM-2-AKV8-B-10.5☐☐☐☐☐☐☐
W25OEM-2-DKV8-B-20.5☐☐☐☐☐☐☐
W26OEM-2-GKV8-B-30.5☐☐☐☐☐☐☐
W27OEM-2-JKV8-B-40.5☐☐☐☐☐☐☐
W28OEM-2-BKV8-D-90.5☐☐☐☐☐☐☐
W29OEM-2-CKV8-B-140.5☐☐☐☐☐☐☐
W30OEM-2-KKV8-B-150.5☐☐☐☐☐☐☐
W31OEM-2-MKV8-B-160.5☐☐☐☐☐☐☐
W32OEM-3-HKV8-B-170.5☐☐☐☐☐☐☐
W33OEM-3-JKV8-A-100.5☐☐☐☐☐☐☐
W34OEM-3-PKV8-A-110.5☐☐☐☐☐☐☐
W35OEM-2-QKV8-B-100.5☐☐☐☐☐☐☐
W36OEM-2-EKV8-B-110.5☐☐☐☐☐☐☐
W37OEM-2-FKV8-B-120.5☐☐☐☐☐☐☐
W38OEM-2-HKV8-B-130.5☐☐☐☐☐☐☐
W39OEM-2-IKV8-B-50.5☐☐☐☐☐☐☐
W40OEM-2-NKV8-B-60.5☐☐☐☐☐☐☐
W41OEM-2-RKV8-B-70.5☐☐☐☐☐☐☐
W42OEM-3-DKV8-B-80.5☐☐☐☐☐☐☐
W43OEM-3-EKV8-B-180.5☐☐☐☐☐☐☐
W44OEM-3-MKV8-B-190.5☐☐☐☐☐☐☐
W45OEM-3-UKV8-B-200.5☐☐☐☐☐☐☐
W46OEM-4-DKV8-B-210.5☐☐☐☐☐☐☐
W47OEM-4-XKV8-C-20.5☐☐☐☐☐☐☐
W48OEM-4-VKV8-C-30.5☐☐☐☐☐☐☐
W49OEM-4-AAKV8-C-40.5☐☐☐☐☐☐☐
W50OEM-4-WKV8-C-50.5☐☐☐☐☐☐☐
W51OEM-4-PKV8-C-60.5☐☐☐☐☐☐☐
W52OEM-4-NKV8-C-70.5☐☐☐☐☐☐☐
W53OEM-4-ADKV8-C-80.5☐☐☐☐☐☐☐
W54OEM-3-TKV8-C-270.5☐☐☐☐☐☐☐
W55OEM-3-SKV8-C-280.5☐☐☐☐☐☐☐
W56OEM-4-BKV8-C-290.5☐☐☐☐☐☐☐
W57OEM-4-CKV8-C-300.5☐☐☐☐☐☐☐
W58OEM-4-FKV8-C-310.5☐☐☐☐☐☐☐
W59OEM-4-HKV8-C-320.5☐☐☐☐☐☐☐
W60OEM-4-IKV8-C-330.5☐☐☐☐☐☐☐
W61OEM-4-JKV8-C-340.5☐☐☐☐☐☐☐

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
1KV8-D-1KV8-B-34open (OL)+12 V supply must not touch power ground
2KV8-D-1KV8-C-17open (OL)+12 V supply must not touch sensor ground
3KV8-D-21KV8-C-17open (OL)5 V sensor reference must not touch sensor ground
4KV8-B-34KV8-D-21open (OL)power ground must not touch 5 V sensor reference
5KV8-D-1KV8-D-21open (OL)+12 V supply must not touch 5 V sensor reference

Revisions

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Schematic

KV8-AKV8-BKV8-CKV8-DOEM-2OEM-3OEM-4SP-0VSP-14VSP-GND

Connectors

KV8-A

Mating face
KV8-A-11KV8-A-22KV8-A-33KV8-A-44KV8-A-55KV8-A-66KV8-A-77KV8-A-88KV8-A-99KV8-A-10 · Lambda 1 heater −10KV8-A-11 · Lambda 2 heater −11KV8-A-1212KV8-A-1313KV8-A-1414KV8-A-1515KV8-A-16 · Lambda 1 heater +16KV8-A-17 · Lambda 2 heater +17KV8-A-18 · Lambda 1 Nernst cell (Vs)18KV8-A-1919KV8-A-20 · Lambda 2 cal resistor20KV8-A-21 · Lambda 2 Nernst cell (Vs)21KV8-A-22 · Lambda 2 pump cell (Ip)22KV8-A-23 · Lambda 2 virtual ground23KV8-A-24 · Lambda 1 cal resistor24KV8-A-25 · Lambda 1 pump cell (Ip)25KV8-A-26 · Lambda 1 virtual ground26
Wire side
KV8-A-11KV8-A-22KV8-A-33KV8-A-44KV8-A-55KV8-A-66KV8-A-77KV8-A-88KV8-A-99KV8-A-10 · Lambda 1 heater −10KV8-A-11 · Lambda 2 heater −11KV8-A-1212KV8-A-1313KV8-A-1414KV8-A-1515KV8-A-16 · Lambda 1 heater +16KV8-A-17 · Lambda 2 heater +17KV8-A-18 · Lambda 1 Nernst cell (Vs)18KV8-A-1919KV8-A-20 · Lambda 2 cal resistor20KV8-A-21 · Lambda 2 Nernst cell (Vs)21KV8-A-22 · Lambda 2 pump cell (Ip)22KV8-A-23 · Lambda 2 virtual ground23KV8-A-24 · Lambda 1 cal resistor24KV8-A-25 · Lambda 1 pump cell (Ip)25KV8-A-26 · Lambda 1 virtual ground26
CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1—————————
2—————————
3—————————
4—————————
5—————————
6—————————
7—————————
8—————————
9—————————
10Lambda 1 heater −—W33—0.5OEM-3-J———
11Lambda 2 heater −—W34—0.5OEM-3-P———
12—————————
13—————————
14—————————
15—————————
16Lambda 1 heater +————————
17Lambda 2 heater +————————
18Lambda 1 Nernst cell (Vs)————————
19—————————
20Lambda 2 cal resistor————————
21Lambda 2 Nernst cell (Vs)————————
22Lambda 2 pump cell (Ip)————————
23Lambda 2 virtual ground————————
24Lambda 1 cal resistor————————
25Lambda 1 pump cell (Ip)————————
26Lambda 1 virtual ground————————

KV8-B

Mating face
KV8-B-1 · Injection 11KV8-B-2 · Injection 22KV8-B-3 · Injection 33KV8-B-4 · Injection 44KV8-B-5 · Injection 55KV8-B-6 · Injection 66KV8-B-7 · Injection 77KV8-B-8 · Injection 88KV8-B-9 · ECU ground9KV8-B-10 · Aux 110KV8-B-11 · Aux 211KV8-B-12 · Aux 312KV8-B-13 · Aux 413KV8-B-14 · Aux 514KV8-B-15 · Aux 615KV8-B-16 · Aux 716KV8-B-17 · Aux 817KV8-B-18 · Aux 918KV8-B-19 · Aux 1019KV8-B-20 · Aux 1120KV8-B-21 · Aux 1221KV8-B-22 · Aux 1322KV8-B-23 · Aux 1423KV8-B-24 · Aux 1524KV8-B-25 · Aux 1625KV8-B-26 · Ignition 126KV8-B-27 · Ignition 227KV8-B-28 · Ignition 328KV8-B-29 · Ignition 429KV8-B-30 · Ignition 530KV8-B-31 · Ignition 631KV8-B-32 · Ignition 732KV8-B-33 · Ignition 833KV8-B-34 · ECU ground34
Wire side
KV8-B-1 · Injection 11KV8-B-2 · Injection 22KV8-B-3 · Injection 33KV8-B-4 · Injection 44KV8-B-5 · Injection 55KV8-B-6 · Injection 66KV8-B-7 · Injection 77KV8-B-8 · Injection 88KV8-B-9 · ECU ground9KV8-B-10 · Aux 110KV8-B-11 · Aux 211KV8-B-12 · Aux 312KV8-B-13 · Aux 413KV8-B-14 · Aux 514KV8-B-15 · Aux 615KV8-B-16 · Aux 716KV8-B-17 · Aux 817KV8-B-18 · Aux 918KV8-B-19 · Aux 1019KV8-B-20 · Aux 1120KV8-B-21 · Aux 1221KV8-B-22 · Aux 1322KV8-B-23 · Aux 1423KV8-B-24 · Aux 1524KV8-B-25 · Aux 1625KV8-B-26 · Ignition 126KV8-B-27 · Ignition 227KV8-B-28 · Ignition 328KV8-B-29 · Ignition 429KV8-B-30 · Ignition 530KV8-B-31 · Ignition 631KV8-B-32 · Ignition 732KV8-B-33 · Ignition 833KV8-B-34 · ECU ground34
CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Injection 1—W24—0.5OEM-2-A———
2Injection 2—W25—0.5OEM-2-D———
3Injection 3—W26—0.5OEM-2-G———
4Injection 4—W27—0.5OEM-2-J———
5Injection 5—W39—0.5OEM-2-I———
6Injection 6—W40—0.5OEM-2-N———
7Injection 7—W41—0.5OEM-2-R———
8Injection 8—W42—0.5OEM-3-D———
9ECU ground—W10—0.85SP-GND-1———
10Aux 1—W35—0.5OEM-2-Q———
11Aux 2—W36—0.5OEM-2-E———
12Aux 3—W37—0.5OEM-2-F———
13Aux 4—W38—0.5OEM-2-H———
14Aux 5—W29—0.5OEM-2-C———
15Aux 6—W30—0.5OEM-2-K———
16Aux 7—W31—0.5OEM-2-M———
17Aux 8—W32—0.5OEM-3-H———
18Aux 9—W43—0.5OEM-3-E———
19Aux 10—W44—0.5OEM-3-M———
20Aux 11—W45—0.5OEM-3-U———
21Aux 12—W46—0.5OEM-4-D———
22Aux 13————————
23Aux 14————————
24Aux 15————————
25Aux 16————————
26Ignition 1—W22—0.5OEM-3-F———
27Ignition 2—W23—0.5OEM-3-I———
28Ignition 3————————
29Ignition 4————————
30Ignition 5————————
31Ignition 6————————
32Ignition 7————————
33Ignition 8————————
34ECU ground—W9—0.85SP-GND-1———

KV8-C

Mating face
KV8-C-1 · ECU ground1KV8-C-2 · Analog in 12KV8-C-3 · Analog in 23KV8-C-4 · Analog in 34KV8-C-5 · Analog in 45KV8-C-6 · Analog in 56KV8-C-7 · Analog in 67KV8-C-8 · Analog in 78KV8-C-9 · Analog in 89KV8-C-10 · Analog in 910KV8-C-11 · Analog in 1011KV8-C-12 · Analog in 1112KV8-C-13 · Analog in 1213KV8-C-14 · Analog in 1314KV8-C-15 · Analog in 1415KV8-C-16 · Analog in 1516KV8-C-17 · Analog sensor 0V reference17KV8-C-18 · Digital in 918KV8-C-19 · Digital in 1019KV8-C-20 · Digital in 1120KV8-C-21 · Digital in 1221KV8-C-22 · Digital in 1322KV8-C-23 · Digital in 1423KV8-C-24 · Analog in 1624KV8-C-25 · Analog sensor 0V reference25KV8-C-26 · ECU ground26KV8-C-27 · Digital in 127KV8-C-28 · Digital in 228KV8-C-29 · Digital in 329KV8-C-30 · Digital in 430KV8-C-31 · Digital in 531KV8-C-32 · Digital in 632KV8-C-33 · Digital in 733KV8-C-34 · Digital in 834
Wire side
KV8-C-1 · ECU ground1KV8-C-2 · Analog in 12KV8-C-3 · Analog in 23KV8-C-4 · Analog in 34KV8-C-5 · Analog in 45KV8-C-6 · Analog in 56KV8-C-7 · Analog in 67KV8-C-8 · Analog in 78KV8-C-9 · Analog in 89KV8-C-10 · Analog in 910KV8-C-11 · Analog in 1011KV8-C-12 · Analog in 1112KV8-C-13 · Analog in 1213KV8-C-14 · Analog in 1314KV8-C-15 · Analog in 1415KV8-C-16 · Analog in 1516KV8-C-17 · Analog sensor 0V reference17KV8-C-18 · Digital in 918KV8-C-19 · Digital in 1019KV8-C-20 · Digital in 1120KV8-C-21 · Digital in 1221KV8-C-22 · Digital in 1322KV8-C-23 · Digital in 1423KV8-C-24 · Analog in 1624KV8-C-25 · Analog sensor 0V reference25KV8-C-26 · ECU ground26KV8-C-27 · Digital in 127KV8-C-28 · Digital in 228KV8-C-29 · Digital in 329KV8-C-30 · Digital in 430KV8-C-31 · Digital in 531KV8-C-32 · Digital in 632KV8-C-33 · Digital in 733KV8-C-34 · Digital in 834
CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1ECU ground—W11—0.85SP-GND-1———
2Analog in 1—W47—0.5OEM-4-X———
3Analog in 2—W48—0.5OEM-4-V———
4Analog in 3—W49—0.5OEM-4-AA———
5Analog in 4—W50—0.5OEM-4-W———
6Analog in 5—W51—0.5OEM-4-P———
7Analog in 6—W52—0.5OEM-4-N———
8Analog in 7—W53—0.5OEM-4-AD———
9Analog in 8————————
10Analog in 9————————
11Analog in 10————————
12Analog in 11————————
13Analog in 12————————
14Analog in 13————————
15Analog in 14————————
16Analog in 15————————
17Analog sensor 0V reference—W14—0.5SP-0V-1———
18Digital in 9————————
19Digital in 10————————
20Digital in 11————————
21Digital in 12————————
22Digital in 13————————
23Digital in 14————————
24Analog in 16————————
25Analog sensor 0V reference—W15—0.5SP-0V-1———
26ECU ground—W12—0.85SP-GND-1———
27Digital in 1—W54—0.5OEM-3-T———
28Digital in 2—W55—0.5OEM-3-S———
29Digital in 3—W56—0.5OEM-4-B———
30Digital in 4—W57—0.5OEM-4-C———
31Digital in 5—W58—0.5OEM-4-F———
32Digital in 6—W59—0.5OEM-4-H———
33Digital in 7—W60—0.5OEM-4-I———
34Digital in 8—W61—0.5OEM-4-J———

KV8-D

Mating face
KV8-D-1 · ECU 14V supply1KV8-D-2 · Aux 13–16 14V supply2KV8-D-3 · Sensor supply 8V3KV8-D-4 · Crank index sensor +4KV8-D-5 · Crank index sensor −5KV8-D-6 · Sync sensor +6KV8-D-7 · Sync sensor −7KV8-D-8 · CAN 1 H8KV8-D-9 · EFI relay output (low side, 200 mA)9KV8-D-10 · CAN 2 H10KV8-D-11 · Knock 1 +11KV8-D-12 · Knock 1 −12KV8-D-13 · Shield (crank/cam/knock)13KV8-D-14 · CAN 1 L14KV8-D-15 · Ignition switch input15KV8-D-16 · CAN 2 L16KV8-D-17 · Knock 2 +17KV8-D-18 · Knock 2 −18KV8-D-19 · Analog output 0–5V19KV8-D-20 · Aux 9–12 14V supply20KV8-D-21 · Sensor supply Vref1 5.0V21KV8-D-22 · Sensor supply Vref2 5.0V22KV8-D-23 · Ethernet Tx+23KV8-D-24 · Ethernet Tx−24KV8-D-25 · Ethernet Rx+25KV8-D-26 · Ethernet Rx−26
Wire side
KV8-D-1 · ECU 14V supply1KV8-D-2 · Aux 13–16 14V supply2KV8-D-3 · Sensor supply 8V3KV8-D-4 · Crank index sensor +4KV8-D-5 · Crank index sensor −5KV8-D-6 · Sync sensor +6KV8-D-7 · Sync sensor −7KV8-D-8 · CAN 1 H8KV8-D-9 · EFI relay output (low side, 200 mA)9KV8-D-10 · CAN 2 H10KV8-D-11 · Knock 1 +11KV8-D-12 · Knock 1 −12KV8-D-13 · Shield (crank/cam/knock)13KV8-D-14 · CAN 1 L14KV8-D-15 · Ignition switch input15KV8-D-16 · CAN 2 L16KV8-D-17 · Knock 2 +17KV8-D-18 · Knock 2 −18KV8-D-19 · Analog output 0–5V19KV8-D-20 · Aux 9–12 14V supply20KV8-D-21 · Sensor supply Vref1 5.0V21KV8-D-22 · Sensor supply Vref2 5.0V22KV8-D-23 · Ethernet Tx+23KV8-D-24 · Ethernet Tx−24KV8-D-25 · Ethernet Rx+25KV8-D-26 · Ethernet Rx−26
CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1ECU 14V supply—W3—0.85SP-14V-1———
2Aux 13–16 14V supply—W4—0.85SP-14V-1———
3Sensor supply 8V————————
4Crank index sensor +—W17—0.5OEM-3-Y———
5Crank index sensor −—W18—0.5SP-0V-1———
6Sync sensor +—W19—0.5OEM-3-V———
7Sync sensor −—W20—0.5SP-0V-1———
8CAN 1 H————————
9EFI relay output (low side, 200 mA)—W28—0.5OEM-2-B———
10CAN 2 H————————
11Knock 1 +—W21—0.5OEM-4-M———
12Knock 1 −————————
13Shield (crank/cam/knock)————————
14CAN 1 L————————
15Ignition switch input————————
16CAN 2 L————————
17Knock 2 +————————
18Knock 2 −————————
19Analog output 0–5V————————
20Aux 9–12 14V supply—W5—0.85SP-14V-1———
21Sensor supply Vref1 5.0V—W16—0.5OEM-4-L———
22Sensor supply Vref2 5.0V————————
23Ethernet Tx+————————
24Ethernet Tx−————————
25Ethernet Rx+————————
26Ethernet Rx−————————

OEM-2

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
AInjector 1—W24—0.5KV8-B-1———
BCooling fan relay—W28—0.5KV8-D-9———
CCondenser fan relay—W29—0.5KV8-B-14———
DInjector 2—W25—0.5KV8-B-2———
EEGR valve—W36—0.5KV8-B-11———
FEGR valve—W37—0.5KV8-B-12———
GInjector 3—W26—0.5KV8-B-3———
HEGR valve—W38—0.5KV8-B-13———
IEGR valve—W39—0.5KV8-B-5———
JInjector 4—W27—0.5KV8-B-4———
KA/C clutch relay—W30—0.5KV8-B-15———
MFuel pump relay—W31—0.5KV8-B-16———
NVTCS solenoid (intake butterflies)—W40—0.5KV8-B-6———
PISC valve +14V feed—W1—0.85SP-14V-1———
QISC valve low side—W35—0.5KV8-B-10———
RMalfunction indicator lamp (MIL)—W41—0.5KV8-B-7———

OEM-3

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
APower ground—W6—0.85SP-GND-1———
BPower ground—W7—0.85SP-GND-1———
DEGR boost solenoid—W42—0.5KV8-B-8———
ECharcoal canister purge—W43—0.5KV8-B-18———
FIgnition 1 (coils 1+4, wasted spark)—W22—0.5KV8-B-26———
HMain relay—W32—0.5KV8-B-17———
IIgnition 2 (coils 2+3, wasted spark)—W23—0.5KV8-B-27———
JFront O2 heater—W33—0.5KV8-A-10———
MAlternator control—W44—0.5KV8-B-19———
OTachometer output————————
PRear O2 heater—W34—0.5KV8-A-11———
SImmobiliser—W55—0.5KV8-C-28———
TVehicle speed—W54—0.5KV8-C-27———
UCharge lamp—W45—0.5KV8-B-20———
VCam position (CMP)—W19—0.5KV8-D-6———
YCrank position (CKP)—W17—0.5KV8-D-4———

OEM-4

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
APower ground—W8—0.85SP-GND-1———
AARear O2 signal—W49—0.5KV8-C-4———
ADFuel level—W53—0.5KV8-C-8———
AFECU power +14V (main relay)—W2—0.85SP-14V-1———
AGConstant +12V————————
BBrake switch—W56—0.5KV8-C-29———
CPower steering pressure switch—W57—0.5KV8-C-30———
DVVT oil-control solenoid—W46—0.5KV8-B-21———
FA/C request—W58—0.5KV8-C-31———
HNeutral switch—W59—0.5KV8-C-32———
IClutch switch—W60—0.5KV8-C-33———
JVTCS vacuum switch—W61—0.5KV8-C-34———
L+5V sensor supply—W16—0.5KV8-D-21———
MKnock sensor—W21—0.5KV8-D-11———
NIntake air temperature (IAT)—W52—0.5KV8-C-7———
OSignal ground—W13—0.5SP-0V-1———
PCoolant temperature (ECT)—W51—0.5KV8-C-6———
VThrottle position (TPS)—W48—0.5KV8-C-3———
WFront O2 signal—W50—0.5KV8-C-5———
XMass air flow (MAF)—W47—0.5KV8-C-2———

SP-0V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W13—0.5OEM-4-O———
1——W14—0.5KV8-C-17———
1——W15—0.5KV8-C-25———
1——W18—0.5KV8-D-5———
1——W20—0.5KV8-D-7———

SP-14V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W1—0.85OEM-2-P———
1——W2—0.85OEM-4-AF———
1——W3—0.85KV8-D-1———
1——W4—0.85KV8-D-2———
1——W5—0.85KV8-D-20———

SP-GND

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W6—0.85OEM-3-A———
1——W7—0.85OEM-3-B———
1——W8—0.85OEM-4-A———
1——W9—0.85KV8-B-34———
1——W10—0.85KV8-B-9———
1——W11—0.85KV8-C-1———
1——W12—0.85KV8-C-26———

Pin map

OEM pointOEM functionOEM familyTarget pointTarget functionTarget familyWire colourEvidence
OEM-2-AInjector 1injector_outKV8-B-1Injection 1injector_outsingle_source
OEM-2-BCooling fan relaylow_side_outKV8-D-9EFI relay output (low side, 200 mA)low_side_outsingle_source
OEM-2-CCondenser fan relaylow_side_outKV8-B-14Aux 5low_side_outsingle_source
OEM-2-DInjector 2injector_outKV8-B-2Injection 2injector_outsingle_source
OEM-2-EEGR valvelow_side_outKV8-B-11Aux 2low_side_outsingle_source
OEM-2-FEGR valvelow_side_outKV8-B-12Aux 3low_side_outsingle_source
OEM-2-GInjector 3injector_outKV8-B-3Injection 3injector_outsingle_source
OEM-2-HEGR valvelow_side_outKV8-B-13Aux 4low_side_outsingle_source
OEM-2-IEGR valvelow_side_outKV8-B-5Injection 5injector_outsingle_source
OEM-2-JInjector 4injector_outKV8-B-4Injection 4injector_outsingle_source
OEM-2-KA/C clutch relaylow_side_outKV8-B-15Aux 6low_side_outsingle_source
OEM-2-MFuel pump relaylow_side_outKV8-B-16Aux 7low_side_outsingle_source
OEM-2-NVTCS solenoid (intake butterflies)low_side_outKV8-B-6Injection 6injector_outsingle_source
OEM-2-PISC valve +14V feedpower_inKV8-D-1 + KV8-D-2 + KV8-D-20ECU 14V supply + Aux 13–16 14V supply + Aux 9–12 14V supplypower_insingle_source
OEM-2-QISC valve low sidelow_side_outKV8-B-10Aux 1low_side_outsingle_source
OEM-2-RMalfunction indicator lamp (MIL)low_side_outKV8-B-7Injection 7injector_outsingle_source
OEM-3-APower groundgroundKV8-B-34 + KV8-B-9 + KV8-C-1 + KV8-C-26ECU ground + ECU ground + ECU ground + ECU groundgroundsingle_source
OEM-3-BPower groundgroundKV8-B-34 + KV8-B-9 + KV8-C-1 + KV8-C-26ECU ground + ECU ground + ECU ground + ECU groundgroundsingle_source
OEM-3-DEGR boost solenoidlow_side_outKV8-B-8Injection 8injector_outsingle_source
OEM-3-ECharcoal canister purgelow_side_outKV8-B-18Aux 9hbridge_outsingle_source
OEM-3-FIgnition 1 (coils 1+4, wasted spark)ignition_outKV8-B-26Ignition 1ignition_outsingle_source
OEM-3-HMain relaylow_side_outKV8-B-17Aux 8low_side_outsingle_source
OEM-3-IIgnition 2 (coils 2+3, wasted spark)ignition_outKV8-B-27Ignition 2ignition_outsingle_source
OEM-3-JFront O2 heaterlow_side_outKV8-A-10Lambda 1 heater −low_side_outsingle_source
OEM-3-MAlternator controllow_side_outKV8-B-19Aux 10hbridge_outsingle_source
OEM-3-OTachometer outputtacho_out———single_source
OEM-3-PRear O2 heaterlow_side_outKV8-A-11Lambda 2 heater −low_side_outsingle_source
OEM-3-SImmobiliserdigital_inKV8-C-28Digital in 2digital_insingle_source
OEM-3-TVehicle speeddigital_inKV8-C-27Digital in 1digital_insingle_source
OEM-3-UCharge lamplow_side_outKV8-B-20Aux 11hbridge_outsingle_source
OEM-3-VCam position (CMP)trigger_inKV8-D-6Sync sensor +trigger_insingle_source
OEM-3-YCrank position (CKP)trigger_inKV8-D-4Crank index sensor +trigger_insingle_source
OEM-4-APower groundgroundKV8-B-34 + KV8-B-9 + KV8-C-1 + KV8-C-26ECU ground + ECU ground + ECU ground + ECU groundgroundsingle_source
OEM-4-AARear O2 signallambda_nb_inKV8-C-4Analog in 3analog_insingle_source
OEM-4-ADFuel levelanalog_inKV8-C-8Analog in 7analog_insingle_source
OEM-4-AFECU power +14V (main relay)power_inKV8-D-1 + KV8-D-2 + KV8-D-20ECU 14V supply + Aux 13–16 14V supply + Aux 9–12 14V supplypower_insingle_source
OEM-4-AGConstant +12Vpower_in———single_source
OEM-4-BBrake switchdigital_inKV8-C-29Digital in 3digital_insingle_source
OEM-4-CPower steering pressure switchdigital_inKV8-C-30Digital in 4digital_insingle_source
OEM-4-DVVT oil-control solenoidlow_side_outKV8-B-21Aux 12hbridge_outsingle_source
OEM-4-FA/C requestdigital_inKV8-C-31Digital in 5digital_insingle_source
OEM-4-HNeutral switchdigital_inKV8-C-32Digital in 6digital_insingle_source
OEM-4-IClutch switchdigital_inKV8-C-33Digital in 7digital_insingle_source
OEM-4-JVTCS vacuum switchdigital_inKV8-C-34Digital in 8digital_insingle_source
OEM-4-L+5V sensor supplyvrefKV8-D-21Sensor supply Vref1 5.0Vvrefsingle_source
OEM-4-MKnock sensorknock_inKV8-D-11Knock 1 +knock_insingle_source
OEM-4-NIntake air temperature (IAT)temp_inKV8-C-7Analog in 6analog_insingle_source
OEM-4-OSignal groundsensor_groundKV8-C-17 + KV8-C-25 + KV8-D-5 + KV8-D-7Analog sensor 0V reference + Analog sensor 0V reference + Crank index sensor − + Sync sensor −sensor_ground + trigger_insingle_source
OEM-4-PCoolant temperature (ECT)temp_inKV8-C-6Analog in 5analog_insingle_source
OEM-4-VThrottle position (TPS)analog_inKV8-C-3Analog in 2analog_insingle_source
OEM-4-WFront O2 signallambda_nb_inKV8-C-5Analog in 4analog_insingle_source
OEM-4-XMass air flow (MAF)analog_inKV8-C-2Analog in 1analog_insingle_source

Cut list

WireFromToGauge (mm²)ColourLengthSignalIdent
W1OEM-2-PSP-14V-10.85no routeISC valve +14V feed—
W2OEM-4-AFSP-14V-10.85no routeECU power +14V (main relay)—
W3SP-14V-1KV8-D-10.85no routeECU 14V supply—
W4SP-14V-1KV8-D-20.85no routeAux 13–16 14V supply—
W5SP-14V-1KV8-D-200.85no routeAux 9–12 14V supply—
W6OEM-3-ASP-GND-10.85no routePower ground—
W7OEM-3-BSP-GND-10.85no routePower ground—
W8OEM-4-ASP-GND-10.85no routePower ground—
W9SP-GND-1KV8-B-340.85no routeECU ground—
W10SP-GND-1KV8-B-90.85no routeECU ground—
W11SP-GND-1KV8-C-10.85no routeECU ground—
W12SP-GND-1KV8-C-260.85no routeECU ground—
W13OEM-4-OSP-0V-10.5no routeSignal ground—
W14SP-0V-1KV8-C-170.5no routeAnalog sensor 0V reference—
W15SP-0V-1KV8-C-250.5no routeAnalog sensor 0V reference—
W16OEM-4-LKV8-D-210.5no route+5V sensor supply—
W17OEM-3-YKV8-D-40.5no routeCrank position (CKP)—
W18SP-0V-1KV8-D-50.5no routeCrank index sensor −—
W19OEM-3-VKV8-D-60.5no routeCam position (CMP)—
W20SP-0V-1KV8-D-70.5no routeSync sensor −—
W21OEM-4-MKV8-D-110.5no routeKnock sensor—
W22OEM-3-FKV8-B-260.5no routeIgnition 1 (coils 1+4, wasted spark)—
W23OEM-3-IKV8-B-270.5no routeIgnition 2 (coils 2+3, wasted spark)—
W24OEM-2-AKV8-B-10.5no routeInjector 1—
W25OEM-2-DKV8-B-20.5no routeInjector 2—
W26OEM-2-GKV8-B-30.5no routeInjector 3—
W27OEM-2-JKV8-B-40.5no routeInjector 4—
W28OEM-2-BKV8-D-90.5no routeCooling fan relay—
W29OEM-2-CKV8-B-140.5no routeCondenser fan relay—
W30OEM-2-KKV8-B-150.5no routeA/C clutch relay—
W31OEM-2-MKV8-B-160.5no routeFuel pump relay—
W32OEM-3-HKV8-B-170.5no routeMain relay—
W33OEM-3-JKV8-A-100.5no routeFront O2 heater—
W34OEM-3-PKV8-A-110.5no routeRear O2 heater—
W35OEM-2-QKV8-B-100.5no routeISC valve low side—
W36OEM-2-EKV8-B-110.5no routeEGR valve—
W37OEM-2-FKV8-B-120.5no routeEGR valve—
W38OEM-2-HKV8-B-130.5no routeEGR valve—
W39OEM-2-IKV8-B-50.5no routeEGR valve—
W40OEM-2-NKV8-B-60.5no routeVTCS solenoid (intake butterflies)—
W41OEM-2-RKV8-B-70.5no routeMalfunction indicator lamp (MIL)—
W42OEM-3-DKV8-B-80.5no routeEGR boost solenoid—
W43OEM-3-EKV8-B-180.5no routeCharcoal canister purge—
W44OEM-3-MKV8-B-190.5no routeAlternator control—
W45OEM-3-UKV8-B-200.5no routeCharge lamp—
W46OEM-4-DKV8-B-210.5no routeVVT oil-control solenoid—
W47OEM-4-XKV8-C-20.5no routeMass air flow (MAF)—
W48OEM-4-VKV8-C-30.5no routeThrottle position (TPS)—
W49OEM-4-AAKV8-C-40.5no routeRear O2 signal—
W50OEM-4-WKV8-C-50.5no routeFront O2 signal—
W51OEM-4-PKV8-C-60.5no routeCoolant temperature (ECT)—
W52OEM-4-NKV8-C-70.5no routeIntake air temperature (IAT)—
W53OEM-4-ADKV8-C-80.5no routeFuel level—
W54OEM-3-TKV8-C-270.5no routeVehicle speed—
W55OEM-3-SKV8-C-280.5no routeImmobiliser—
W56OEM-4-BKV8-C-290.5no routeBrake switch—
W57OEM-4-CKV8-C-300.5no routePower steering pressure switch—
W58OEM-4-FKV8-C-310.5no routeA/C request—
W59OEM-4-HKV8-C-320.5no routeNeutral switch—
W60OEM-4-IKV8-C-330.5no routeClutch switch—
W61OEM-4-JKV8-C-340.5no routeVTCS vacuum switch—

Bill of materials

CategoryPart numberManufacturerDescriptionQtyUnit
connector3-1437290-7TESuperseal 1.0 26-way plug1.000ea
connector3-1437290-8TESuperseal 1.0 26-way plug, Key 21.000ea
connector4-1437290-0TESuperseal 1.0 34-way plug, Key 11.000ea
connector4-1437290-1TESuperseal 1.0 34-way plug, Key 21.000ea
terminal3-1447221-4TESuperseal 1.0 socket terminal, 20 AWG (0.5 sq mm)55.000ea

ECU setup sheet

RoleEngine refEngine signalSensorECU pointECU functionECU classSetup flag
No configured channels.

Findings

Open (13)

SeverityCodeSubjectMessage
warnDATASET_GAPKV8 A14 of 26 cavities on KV8 A have no pin data (1,2,3,4,5,6,7,8,9,12,13,14,15,19). Anything there is invisible to these checks.
warnNET_FAMILYOEM-3-E ↔ KV8-B-18OEM-3-E "Charcoal canister purge" [low_side_out] is wired to KV8-B-18 "Aux 9" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way.
warnNET_FAMILYOEM-3-M ↔ KV8-B-19OEM-3-M "Alternator control" [low_side_out] is wired to KV8-B-19 "Aux 10" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way.
warnNET_FAMILYOEM-3-U ↔ KV8-B-20OEM-3-U "Charge lamp" [low_side_out] is wired to KV8-B-20 "Aux 11" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way.
warnNET_FAMILYOEM-4-D ↔ KV8-B-21OEM-4-D "VVT oil-control solenoid" [low_side_out] is wired to KV8-B-21 "Aux 12" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way.
infoNET_FAMILYKV8-C-17 ↔ KV8-D-5KV8-C-17 "Analog sensor 0V reference" [sensor_ground] is wired to KV8-D-5 "Crank index sensor −" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs.
infoNET_FAMILYOEM-2-I ↔ KV8-B-5OEM-2-I "EGR valve" [low_side_out] is wired to KV8-B-5 "Injection 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-2-N ↔ KV8-B-6OEM-2-N "VTCS solenoid (intake butterflies)" [low_side_out] is wired to KV8-B-6 "Injection 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-2-R ↔ KV8-B-7OEM-2-R "Malfunction indicator lamp (MIL)" [low_side_out] is wired to KV8-B-7 "Injection 7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-3-D ↔ KV8-B-8OEM-3-D "EGR boost solenoid" [low_side_out] is wired to KV8-B-8 "Injection 8" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
infoNET_FAMILYOEM-4-N ↔ KV8-C-7OEM-4-N "Intake air temperature (IAT)" [temp_in] is wired to KV8-C-7 "Analog in 6" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one.
infoNET_FAMILYOEM-4-P ↔ KV8-C-6OEM-4-P "Coolant temperature (ECT)" [temp_in] is wired to KV8-C-6 "Analog in 5" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one.
infoUNMAPPEDOEM1 optional OEM pins are not mapped: OEM-3-O Tachometer output

Accepted (1)

CodeSubjectReasonBy
REQUIRED_UNMAPPEDOEM-4-AGBattery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed.mapping-proposal

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-4 AG: Constant +12V: Emtron KV8 has no battery-constant input; not needed - KV8-D 12: Knock 1 − left open: the stock knock sensor has one ECU wire; check the ECU manual for single-wire knock sensors - OEM-3 O: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on Emtron KV8 - KV8-D 15: Ignition switch input: not fed (the stock ECU has no ignition-sense pin); feed it from a switched-ignition source

Sources

ReliabilityKindTitleURLArchiveCapturedSHA-256
4vendor_docLink G4X MX5NB2X install manual (NB2 2001-05)https://linkecu.com/documentation/MX5XNB2.pdfarchive2026-10-05741efdd9f2c8
2user_datasetSubaru ECU Matcher dataset (hiubin), vehicleId=1————