Technical Library

Tech Docs

Wiring diagrams, installation guides, diagnostic references, and tech sheets — organized by fuel system. Select your system below to get started.

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.
7 documents
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TPI
Tuned Port Injection — FiTech Go EFI systems replacing factory TPI setups on SBC and BBC.
0 documents
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TBI
Throttle Body Injection — single and dual TBI conversions and factory TBI system support.
0 documents
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Six Pack
Multi-throttle body setups — individual runner and stacked plenum configurations.
0 documents
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DBW
Drive By Wire — electronic throttle body systems, pedal calibration, and safety circuit wiring.
0 documents
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General / Universal
Docs that apply across systems — RFI noise, O2 sensors, relay wiring, Dakota Digital, and more.
0 documents
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Selected System
LS
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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
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Wiring Diagrams
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TPI wiring diagrams coming soon

Troubleshooting
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TPI troubleshooting docs coming soon

Selected System
TBI
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Wiring Diagrams
📂

TBI wiring diagrams coming soon

Troubleshooting
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TBI troubleshooting docs coming soon

Selected System
Six Pack
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Wiring Diagrams
📂

Six Pack wiring diagrams coming soon

Selected System
DBW — Drive By Wire
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Wiring Diagrams
📂

DBW wiring diagrams coming soon

Throttle Body Reference
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DBW throttle body docs coming soon

Selected System
General / Universal
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RFI Noise
📂

RFI noise docs coming soon

O2 Sensor
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O2 sensor docs coming soon

HEI / Ignition
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HEI / ignition docs coming soon

Dakota Digital
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Dakota Digital docs coming soon

Relay & Power Wiring
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Relay & power wiring docs coming soon

Transmission
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Transmission docs coming soon

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