MAFSync Owner Resources

Thank You For Choosing MAFSync

You're now part of the Revive Ur Ride family. Every unit is hand-built, bench-tested, and pre-tuned specifically for your engine before it ever ships. This page has everything you need — install guide, how-to videos, troubleshooting, and a direct line to us.

Direct Support Install Guide Firmware Update Pinout Harness Test How-To Videos Troubleshooting

We Stand By Our Product

Got a question, an install issue, or something doesn't look right? Email our helpdesk directly and you'll hear back from a real person — not a ticket queue. Customer service is our priority, full stop.

Email helpdesk@reviveurride.ca
🛠️

HAND-BUILT & BENCH-TESTED

Every unit is assembled and verified before it leaves the shop.

🧭

PRE-TUNED FOR YOUR ENGINE

Flashed and configured for the exact engine code you ordered.

✉️

REAL SUPPORT, DIRECT LINE

Email goes straight to the person who built your unit.

Install Guide

MAFSync is a plug-and-play install — no ECU flashing or cutting required. Follow the steps below in order.

Unboxing the MAFSync kit
1

Unbox & Inventory

Confirm your kit contains the MAFSync module, the pre-terminated harness for your engine's connector, mounting hardware, and the quick-start card. Check the label on the inside of the box — it should match the engine code you ordered.

Confirming the MAFSync unit label matches your order
2

Pre-Loaded & Ready

Your MAFSync arrives pre-flashed for the engine you ordered — there's nothing to configure or load. Just confirm the label on the unit matches your car before installing.

Ordered for a different engine, or need a change down the road? No re-buy required — we can push a firmware update. See Firmware Update.
Locating the factory AFM connector
3

Locate the Factory AFM Connector

Find the factory airflow meter connector in the engine bay — typically mounted on or near the airbox/intake boot, feeding into the factory harness toward the DME.

Disconnecting the battery before install
4

Disconnect the Battery

Disconnect the negative battery terminal before doing any wiring. This protects the DME and prevents shorts while you're working around the harness.

Safety first. Never connect or disconnect the module with the battery live.
Connecting MAFSync in-line between AFM and DME harness
5

Connect MAFSync In-Line

MAFSync installs in-line between your new hot-wire MAF sensor and the factory AFM-side connector — no splicing or cutting the factory harness. Plug the harness fully into both ends until each connector clicks/seats.

Mounting the MAFSync module in the engine bay
6

Mount the Module

Secure the module somewhere clean and dry, away from exhaust heat and moving parts (belts, fan). Zip-tie the harness clear of anything that moves or gets hot, keeping it away from ignition coil primary wiring where possible.

Reconnecting battery and checking power-on LED
7

Reconnect Battery & Power-On Check

Reconnect the negative terminal. With the key on (engine off), confirm the status LED on the module lights up steady. That means the unit is powered and ready.

Starting the engine after MAFSync install
8

Start the Engine

Start the car and let it idle. It's normal for idle to be slightly rough for the first minute while the ECU relearns fueling — it should settle into a smooth, stable idle. No check engine light should be present.

If idle stays rough after a short drive cycle, see Troubleshooting below before reaching out — it usually resolves itself.

Firmware Update Available

Get the latest features and performance improvements by updating your module — right from your garage. You can do this yourself; it just takes a slightly more hands-on step to reach the hardware.

🚀 Flash the Latest Firmware

A one-time link, one click in your browser. No IDE and nothing to install — plug in the module and flash.

Email Us for the Flash Link
  1. 1

    Access the USB port

    Carefully open the module's case, or make a small hole in the side, to reach the internal USB connector.

  2. 2

    Gather your hardware

    A standard USB data cable (not charge-only) and a PC running a Chromium-based browser — Chrome or Edge.

  3. 3

    Request your link

    Email us for the flash. We'll reply with a one-time link to the web updater — plug in, click once, done.

Browser note. The web updater uses Web Serial, which works in Chrome or Edge on desktop. Firefox and Safari aren't supported for flashing.

Harness & Pinout Diagram

Wiring it up? Double-check every connection against the harness and pinout schematic below before you power on the system.

MAFSync harness and pinout schematic
Download Pinout PDF

How-To Videos

Prefer to watch instead of read? These walk through the install and common questions step by step.

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Full MAFSync Install Walkthrough

Start-to-finish install on a live BMW build.
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Wiring & Connector Guide

Close-up on the harness connections and mounting.
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Common Issues & Fixes

The most frequent install questions, answered on camera.

Troubleshooting

Most issues come down to one of these. Check here before emailing — it might save you a step.

Harness Testing & Pinout

Before chasing a fault, verify the harness with a multimeter. Most "won't start" and "no signal" calls come down to a connector that isn't fully seated or a supply/ground that isn't there. Work through the checks below in order.

Compatible sensor. MAFSync is built for the Bosch HFM5 hot-wire MAF (5-pin) — 70 mm or 80 mm bore depending on your engine's airflow. Bosch new and Pierburg (RockAuto 722684100 70 mm / 722684110 80 mm) are the reliable picks. A healthy sensor reads roughly 1.00–1.02 V at zero flow. Avoid low-cost reman units.

Module connector J3 — TE AMPSEAL 14-way (776267-1). Pin numbers below are the module-side positions. Pins 1–9 are all a standard build ever uses — pins 10–14 are only populated when the full-options DataLogger is fitted.

Pin Function Dir Expected reading
1+12 V supplyPower~12–14 V, key on (TVS-protected)
2GND (GNDREF)Ground<0.5 Ω to battery −
3GND (GNDREF)Ground<0.5 Ω to battery −
4ECU REFInReference from DME (engine-dependent)
5+5 V referencePower~5 V, key on
6MAF INInHFM5 signal — ~1.0 V at rest, rises with rpm
7AFM OUTOutKOEO ~0.2–0.3 V, idle ~1.2–1.4 V, rises with load*
8IAT INInNTC — resistance falls as it warms
9IAT OUTOutEmulated IAT to DME (NTC-equivalent) — pins 1–9 end here on a standard build
10AUX INInDataLogger option only — application-specific
11O2 INInDataLogger option only — narrowband ~0.1–0.9 V oscillating (if wired)
12A7 (spare analog in)InDataLogger option only — 0–5 V analog sense (ADC-only)
13FP OUTOutDataLogger option only — fuel-pump enable, switched with airflow
14RPM INInDataLogger option only — tach pulse (1N4004-clamped, 1 kΩ pull-up)

*AFM output is profile-dependent; the values shown are typical (e.g. an M42B18 profile idles near 1.33 V). Full schematic is in the Harness & Pinout Diagram section above.

Test procedure

  1. 1

    Continuity, battery disconnected

    With the negative terminal off and the DMM in continuity mode, buzz out each harness conductor end-to-end. Then confirm there is no continuity between adjacent pins — a short between signal and power is the fault that damages a DME.

  2. 2

    Power & ground, key on / engine off

    Pin 1 (+12 V) to chassis ground should read ~12–14 V. Pins 2/3 (GND) to battery negative should read <0.5 Ω. No power or a high-resistance ground = fix that first; everything downstream depends on it.

  3. 3

    MAF signal, idling

    Backprobe pin 6 (MAF IN). It should sit near 1.0 V at idle and climb smoothly as you blip the throttle. A dead flat, pinned-high, or twitchy reading points at the sensor or its wiring — not MAFSync.

  4. 4

    AFM output, MAFSync → DME

    Backprobe pin 7 (AFM OUT). Key-on should read a low resting voltage; idle should be a steady mid value that rises with load. A flatline that never moves means the module isn't seeing power or the connector isn't fully seated — recheck steps 1–2.

  5. 5

    Seat, secure, re-test

    Push both connectors home until they click, dress the harness clear of heat and moving parts, then repeat the power-on check. Still off after a full drive cycle? Email us your readings from steps 2–4 and we'll narrow it down fast.

Engine won't start or won't crank after install
  • Confirm the battery negative terminal is fully reconnected and tight.
  • Recheck that both ends of the MAFSync harness are fully seated — a partially connected plug is the most common cause.
Rough or unstable idle after install
  • Give it a short drive cycle (10–15 minutes) — the ECU needs time to relearn idle/fuel trims after any AFM/MAF change.
  • Double-check both connectors are fully seated and locked.
  • Confirm no vacuum leaks were introduced near the intake boot during install.
  • Still rough after a full drive cycle? Email us your engine code and we'll help you narrow it down.
Not sure about the wiring / pinout
  • Your quick-start card (included in the box) covers the connector orientation for your specific kit.
  • Still unsure? Send us a photo of your connector and we'll walk you through it directly.
Warranty & returns
  • Every unit is covered — email helpdesk@reviveurride.ca with your order number and a description of the issue.
  • We stand by every unit we build. If something's wrong, we'll make it right.

Still Stuck?

Send us a note with your order number, engine code, and what you're seeing (photos help). We'll get back to you directly.

Email helpdesk@reviveurride.ca