ACES Killshot 2 Pro → rusEFI uaEFI

1989 Corvette C4 · L98 350 SBC · 4-injector TBI

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✅ All checks passed

✓ Pin conflicts

✓ Critical signals

✓ 12V traps abandoned

✓ Ground separation

✓ No duplicate sources

Signal	Path	Color	AWG	Category	Disp.	V	S	T	Notes
+12VACES: Main_Power	PIA-26 → A8	RED	16	Power	repin	✓	—	—	Tie PIA-26 + PIA-27.
+12VACES: Main_Power	PIA-27 → A8	RED	16	Power	repin	✓	—	—	Tie PIA-26 + PIA-27.
IGNSW	PIA-8 → A7	RED	20	Power	repin	✓	—	—	Switched 12V from key.
Main RelayACES: Main_Relay	PIA-34 → B9	BLACK	20	Power	repin	✓	—	—	VNLD5090 (U6). Internal active clamp. External 1N4007 recommended for large relays.
GND	PIA-19 → A3 \| A4	BLACK	20	Ground	repin	✓	—	—	Tie all power grounds together.
GND	PIA-28 → A3 \| A4	BLACK	16	Ground	repin	✓	—	—	—
GND	PIA-29 → A3 \| A4	BLACK	16	Ground	repin	✓	—	—	—
Sensor GNDACES: Sensor_Ground	PIA-1 → C11	BLACK	20	Ground	repin	✓	—	—	Keep separate from power ground (A3/A4).
Sensor GNDACES: Sensor_Ground	PIC 7 → PIB-18 → C12	BLACK	20	Ground	repin	✓	—	—	—
Sensor GNDACES: Sensor_Ground	PIC 12 → PIB-25 → C13	BLACK	20	Ground	repin	✓	—	—	—
S5V	PIA-2 → C1 \| C2	ORANGE	20	Sensor Ref	repin	✓	—	—	Also feeds HEI BYPASS (5V to enable ECU timing).
S5V	PIC 11 → PIB-24 → D3 \| D4	ORANGE	20	Sensor Ref	repin	✓	—	—	5V sensor reference from TBI.
CTS	PIA-22 → D16	BLUE	20	Sensor	repin	✓	—	—	Coolant temp sensor.
Fuel PressACES: OPS ⚠	PIC 16 → PIA-31 → C15	PURPLE	20	Sensor	repin	✓	—	—	Fuel pressure transducer in TBI. ⚠ ACES mislabeled as OPS. C15 is the uaEFI Fuel Pressure pin (500K PD).
IAT	PIC 18 → PIB-16 → D15	WHITE	20	Sensor	repin	✓	—	—	Intake air temp sensor.
MAP	PIC 26 → PIB-23 → D9	BLUE	20	Sensor	repin	✓	—	—	Internal TBI MAP sensor. uaEFI onboard MAP is unpopulated.
TPS	PIC 19 → PIB-22 → D13	BROWN	20	Sensor	repin	✓	—	—	Primary TPS. TBI internal throttle position sensor.
VSS	new → C7	—	20	Sensor	new	✓	—	—	Hall-effect VSS (3-wire). Signal → C7, Power → switched 12V, Ground → sensor ground. Drop-in replacement for stock magnetic sensor.
WBO CalR	new → E2	—	20	Wideband	new	✓	—	—	LSU 4.9 pin 5.
WBO Heater+	new → E1	—	20	Wideband	new	✓	—	—	LSU 4.9 pin 4. ⚠ CJ125 PWM driver — NOT 12V. Wire directly to sensor, skip ACES C1 harness.
WBO Heater-	new → E3	—	20	Wideband	new	✓	—	—	LSU 4.9 pin 3.
WBO Ip	new → E5	—	20	Wideband	new	✓	—	—	LSU 4.9 pin 1. Pump current.
WBO Vs/GND	new → E4	—	20	Wideband	new	✓	—	—	LSU 4.9 pin 6. Nernst cell reference.
WBO Vs/Ip	new → E6	—	20	Wideband	new	✓	—	—	LSU 4.9 pin 2. Virtual ground.
Distributor VR+	new → HEI pin P	—	20	Ignition	new	—	—	—	Distributor pickup coil positive → HEI module pin P. HEI module conditions VR internally — no uaEFI VR input needed.
Distributor VR-	new → HEI pin N	—	20	Ignition	new	—	—	—	Distributor pickup coil negative → HEI module pin N. VR polarity is critical — reversing swaps trigger edge.
HEI +12V	new → HEI pin +	RED	16	Ignition	new	—	—	—	Switched +12V to HEI module. Use ignition-switched source (same as uaEFI A7).
HEI BYPASS	new → C1 \| C2	—	20	Ignition	new	—	—	—	New wire from HEI module pin B (tan/black) to +5V on C1/C2. Enables ECU timing control. Without this, engine runs on fixed 10° base timing.
HEI Coil	new → Coil -	—	16	Ignition	new	—	—	—	HEI module screw terminal C → coil negative. HEI module handles high-current coil switching — uaEFI B15 only sends 5V logic to HEI pin E.
HEI EST	new → B15	—	20	Ignition	new	—	—	—	New wire to HEI module pin E (white). 5V logic — do NOT drive coil directly.
HEI Ground	new → HEI pin G	BLACK	16	Ignition	new	—	—	—	HEI module case must be grounded to chassis. Mount on flat metal heat sink with thermal paste.
HEI REF	new → C5	—	20	Ignition	new	—	—	—	New wire from HEI module pin R (purple/white). Clean 5V square wave RPM signal to uaEFI C5.
INJ1	PIC 22 → PIB-10 → B6	PURPLE	18	Injector	repin	✓	—	—	Batch Bank 1. Splice with INJ3 at B6.
INJ2	PIC 21 → PIB-3 → B5	GREY	18	Injector	repin	✓	—	—	Batch Bank 2. Splice with INJ4 at B5.
INJ3	PIC 25 → PIB-26 → B6	GREEN	18	Injector	repin	✓	—	—	Batch Bank 1. Splice with INJ1 at B6.
INJ4	PIC 24 → PIB-19 → B5	WHITE	18	Injector	repin	✓	—	—	Batch Bank 2. Splice with INJ2 at B5.
IAC 1AACES: OUTA	PIC 4 → PIB-12 → A1	PURPLE	20	IAC	repin	—	—	—	IAC Coil 1A. Pairing TBD — test continuity to TBI IAC socket.
IAC 1BACES: OUTB	PIC 3 → PIB-6 → A2	GREEN	20	IAC	repin	—	—	—	IAC Coil 1B. Pairing TBD — test continuity to TBI IAC socket.
IAC 2AACES: OUTC	PIC 2 → PIB-13 → A5	BLUE	20	IAC	repin	—	—	—	IAC Coil 2A. Pairing TBD — test continuity to TBI IAC socket.
IAC 2BACES: OUTD	PIC 1 → PIB-7 → A6	YELLOW	20	IAC	repin	—	—	—	IAC Coil 2B. Pairing TBD — test continuity to TBI IAC socket.
FAN1	PIA-32 → B8	GREEN	20	Output	repin	✓	—	—	VNLD5090 (U6 ch2) internal active clamp. rusEFI docs label B8 as Fan Relay.
FAN2	PIA-13 → B7	YELLOW	20	Output	repin	✓	—	—	Has flyback D2 (B5819W). A/C fan relay.
Fuel PumpACES: FUEL_PUMP	PIA-6 → B16	BLACK	20	Output	repin	✓	—	—	Has flyback D5.
TachACES: Tach_OUT	PIA-23 → B17	BROWN	20	Output	repin	✓	—	—	Dash tach output. Configure in TunerStudio.
CAN HACES: CANH	PIA-7 → D7	WHITE	20	CAN	repin	✓	—	—	CAN 2.0B high.
CAN LACES: CANL	PIA-15 → D8	GREEN	20	CAN	repin	✓	—	—	✅ Verified on harness. PDF was wrong — had CANL on PIA-14 (blank).
12V BusACES: Main_12V_out	PIB-4 — cap/stow	RED		Abandon	abandon	✓	—	—	⚠ 12V trap — bridged to PIB-11/17. Cap individually. Do NOT connect to E1.
12V BusACES: Main_12V_out	PIB-11 — cap/stow	RED		Abandon	abandon	✓	—	—	⚠ 12V bus. Cap individually.
12V BusACES: Main_12V_out	PIB-17 — cap/stow	RED		Abandon	abandon	✓	—	—	⚠ 12V bus. Cap individually.
C9 ConnectorACES: COIL+/-	C9-A/B — cap/stow	RED/BLACK	14	Abandon	abandon	✓	—	—	⚠ LIVE 12V trap — 14 AWG coil power. REMOVE entire C9 connector. Short risk if left dangling.
COIL- (ch1)ACES: COIL-	PIA-10 — cap/stow	BLACK	16	Abandon	abandon	✓	—	—	⚠ High-current coil driver. ABANDON — HEI module handles coil drive. Cap and stow.
COIL- (ch2)ACES: COIL-	PIA-11 — cap/stow	BLACK	16	Abandon	abandon	✓	—	—	⚠ ABANDON — cap and stow.
Dome PressACES: Dome_pressure	PIA-30 — cap/stow	ORANGE	20	Abandon	abandon	✓	—	—	Supercharger dome pressure — no supercharger on this engine. Cap.
Fuel LevelACES: Fuel_level	PIA-9 — cap/stow	RED	20	Abandon	abandon	✓	—	—	Working stock fuel gauge. Cap.
IAC 12VACES: VMAIN	PIC-8 — cap/stow	RED		Abandon	abandon	✓	—	—	⚠ IAC coil +12V. uaEFI H-bridge supplies internally. Cap.
IAC 12VACES: VMAIN	PIC-14 — cap/stow	RED		Abandon	abandon	✓	—	—	⚠ IAC coil +12V. Cap.
IAC 12VACES: VMAIN	PIC-15 — cap/stow	RED		Abandon	abandon	✓	—	—	⚠ IAC coil +12V. Cap.
NitrousACES: Nitrous_IN	PIA-24 — cap/stow	BLUE	20	Abandon	abandon	✓	—	—	No nitrous system. Cap.
TPS1ACES: TPS_OUT	PIA-20 — cap/stow	BLUE	20	Abandon	abandon	✓	—	—	TPS output for transmission controllers — not a sensor input. Only one TPS on TBI (PIB-22 → C14). Cap.
Tach_IN	PIA-17 — cap/stow	GREY	20	Abandon	abandon	✓	—	—	Obsolete — RPM comes from HEI REF on C5. Cap and stow.
VSSACES: POINT_OUT/GPS_SPEEDO_OUT	PIA-33 — cap/stow	WHITE	20	Abandon	abandon	✓	—	—	Dead wire — stock magnetic VSS doesn't work with hall-only C7 input. Cap.
Waste1	PIA-21 — cap/stow	PURPLE	20	Abandon	abandon	✓	—	—	No wastegate on this engine. Cap and stow.