Step 1 — Select your fuel system
LS
Gen III & IV LS-based engines — 4.8, 5.3, 6.0, 6.2, LS1 through LS9 and truck variants.
TPI
Tuned Port Injection — FiTech Go EFI systems replacing factory TPI setups on SBC and BBC.
TBI
Throttle Body Injection — single and dual TBI conversions and factory TBI system support.
Six Pack
Multi-throttle body setups — individual runner and stacked plenum configurations.
DBW
Drive By Wire — electronic throttle body systems, pedal calibration, and safety circuit wiring.
General / Universal
Docs that apply across systems — RFI noise, O2 sensors, relay wiring, Dakota Digital, and more.
Selected System
LS
✕ Close
Wiring Diagrams
JPG
Ultimate LS 70050-1 — Full ECU Harness Diagram (Page 1)
Rev 8 — Complete harness diagram. Sensors, injectors, coils, relays. Best for printing.
PNG
Ultimate LS 70050-1 — Full ECU Harness Diagram (Page 1)
Rev 8 — Same diagram in PNG format. Universal browser compatibility.
DRAW.IO
Ultimate LS 70050-1 — Full ECU Harness Diagram (Editable)
Source file — open in draw.io or diagrams.net to edit or customize the diagram.
JPG
Ultimate LS 70050-1 — Coil Sub-Harnesses & Relay Block (Page 2)
Ignition coil wiring (colors normalized to GM) and fuse/relay block backside connections.
JPG
LS3 4x Cam Sensor — ECU Wiring (Rev 2)
Cam sensor to ECU pin wiring for LS3 4x cam sensor using GM pigtail 12627501. Pins 13, 33, 30.
JPG
Camshaft Position Sensor Input — Connector Wiring Reference
Pigtail vs. direct sensor wiring, connector pin locations, and wire colour reference (White=12V, Black=GND, Red=Signal).
CSV
Ultimate LS 7005x — Wire Harness Pin Data (V1.00)
Full pin-by-pin wire harness data table. Open in Excel or Google Sheets.
Crank Sensor
PDF
Crank Sensor Signal Diagnostics
Scope traces, voltage specs, and diagnostic steps for LS crank position sensor faults.
Injector Data
PDF
Injector Data Reference
Flow rates, dead times, and scaling data for common LS injectors used with FiTech systems.
Troubleshooting
PDF
Fault Code Descriptions
Full list of FiTech ECU fault codes with descriptions and recommended diagnostic steps.
Selected System
TPI
✕ Close
Wiring Diagrams
TPI wiring diagrams coming soon
Troubleshooting
TPI troubleshooting docs coming soon
Selected System
TBI
✕ Close
Wiring Diagrams
TBI wiring diagrams coming soon
Troubleshooting
TBI troubleshooting docs coming soon
Selected System
Six Pack
✕ Close
Wiring Diagrams
Six Pack wiring diagrams coming soon
Selected System
DBW — Drive By Wire
✕ Close
Wiring Diagrams
DBW wiring diagrams coming soon
Throttle Body Reference
DBW throttle body docs coming soon
Selected System
General / Universal
✕ Close
RFI Noise
RFI noise docs coming soon
O2 Sensor
O2 sensor docs coming soon
HEI / Ignition
HEI / ignition docs coming soon
Dakota Digital
Dakota Digital docs coming soon
Relay & Power Wiring
Relay & power wiring docs coming soon
Transmission
Transmission docs coming soon
Can't find what you're looking for?
Message me directly — I may have a doc that hasn't been uploaded yet, or I can point you in the right direction.