Link G4+ Atom is a 29-pin wire-in Link ECU on 1 connector: A (29 pins).
It has 4 injector outputs and 4 ignition outputs. The injector drivers are saturated, which means high-impedance injectors. Low-impedance ones need a ballast resistor pack or a different ECU. The ignition outputs are logic-level. Smart coils plug straight in; dumb coils need an igniter in between.
There are 2 dedicated trigger inputs, each happy with a VR or a Hall sensor. There is no knock input. Wideband control needs an external controller, usually over CAN. MAP is an external sensor on an analog input.
The maker does not list drive-by-wire outputs. One CAN bus handles dashes, PDMs and expansion.
Spec sheet
| Connectors | A (29)29 pins in this profile |
|---|---|
| Injector outputs | 4saturated (high-impedance only) |
| Ignition outputs | 4logic-level: smart coils, or an igniter for dumb coils |
| Dedicated trigger inputs | 2VR or Hall |
| Knock inputs | 0 |
| Onboard wideband controllers | 0 |
| Onboard MAP sensor | No |
| CAN buses | 1 |
| Drive-by-wire | Not stated by the maker |
| High-side outputs | 0 |
| Half-bridge outputs | 0 |
| 5V sensor supply | 1 pin |
Worth knowing
- Pin numbers use Link's G4+ 34-way numbering key printed in the Monsoon and Force GDI guides.
Which builds it suits
Of the 58 swap presets in the planner, 0 fit as they are and 1 fits with add-ons; 57 do not fit at all. The add-on it asks for most often is the Link Razor PDM. Where it falls short, it is usually not enough injector output (low-side). The planner fills anything a preset leaves open with its ordinary defaults, so your own build may land differently.
The Mazda Rotary 13B-REW (FD RX-7) needs Link Razor PDM and Link MXS Strada 5" Dash. It can't run the Toyota 1JZ-GE distributor (NA, early): not enough injector output (low-side). It can't run the Ford Coyote 5.0 Gen1 (2011-14): not enough injector output (low-side). It can't run the Nissan SR20DET (S13): not enough knock inputs.
Fits with add-ons 1
- Mazda Rotary 13B-REW (FD RX-7) with Link Razor PDM, Link MXS Strada 5" Dash, Link CAN-Lambda
Does not fit 57
- Toyota 1JZ-GE distributor (NA, early) not enough injector output (low-side)
- Toyota 1JZ-GE VVT-i (coil pack) not enough injector output (low-side)
- Toyota 1JZ-GTE non-VVTi not enough injector output (low-side)
- Toyota 1JZ-GTE VVTi not enough injector output (low-side)
- Toyota 2JZ-GE distributor (NA, early) not enough injector output (low-side)
- Toyota 2JZ-GE VVT-i (coil pack) not enough injector output (low-side)
- Toyota 2JZ-GTE non-VVTi not enough injector output (low-side)
- Toyota 2JZ-GTE VVTi not enough injector output (low-side)
- GM LS1 (Gen3 5.7 alum) not enough injector output (low-side)
- GM LS6 (Gen3 5.7 alum) not enough injector output (low-side)
- GM LS LQ4/LQ9 (Gen3 6.0 iron) not enough injector output (low-side)
- GM LS2 (Gen4 6.0 alum) not enough injector output (low-side)
- GM LS3 (Gen4 6.2 alum, car) not enough injector output (low-side)
- GM LS L76 (Gen4 6.0 alum) not enough injector output (low-side)
- GM LS L92 (Gen4 6.2 alum) not enough injector output (low-side)
- GM LS LY6/L96 (Gen4 6.0 iron) not enough injector output (low-side)
- GM LSA (Gen4 6.2 alum, S/C) not enough injector output (low-side)
- GM LT1 (Gen5 6.2 alum) not enough injector output (low-side)
- GM LT4 (Gen5 6.2 alum, S/C) not enough injector output (low-side)
- Ford Coyote 5.0 Gen1 (2011-14) not enough injector output (low-side)
- Ford Coyote 5.0 Gen2 (2015-17) not enough injector output (low-side)
- Ford Coyote 5.0 Gen3 (2018-23) not enough injector output (low-side)
- Ford Modular 4.6 2V (SOHC) not enough injector output (low-side)
- Ford Modular 4.6 4V Cobra (NA, cable) not enough injector output (low-side)
- Ford Modular 4.6 4V Terminator (S/C, cable) not enough injector output (low-side)
- Ford Modular 5.4 4V Ford GT (S/C, cable) not enough injector output (low-side)
- Ford Modular 5.4 4V GT500 (S/C, DBW) not enough injector output (low-side)
- Ford Coyote Voodoo 5.2 (GT350, flat-plane) not enough injector output (low-side)
- Ford Coyote Predator 5.2 (GT500, cross-plane, S/C) not enough injector output (low-side)
- Ford Barra 4.0 NA (182/190/195) not enough injector output (low-side)
- Ford Barra 4.0 Turbo (240T/245T/270T/310T/325T) not enough injector output (low-side)
- Nissan RB20DET not enough injector output (low-side)
- Nissan RB25DET non-Neo S1 (R33, dumb coils) not enough injector output (low-side)
- Nissan RB25DET non-Neo S2 (R33, smart coils) not enough injector output (low-side)
- Nissan RB25DET Neo (R34) not enough injector output (low-side)
- Nissan RB26DETT (R32/R33, dumb coils) not enough injector output (low-side)
- Nissan RB26DETT (R34, smart coils) not enough injector output (low-side)
- Nissan VR38DETT (R35 GT-R) not enough injector output (low-side)
- Nissan SR20DET (S13) not enough knock inputs
- Nissan SR20DET (S14) not enough knock inputs
- Nissan SR20DET (S15) not enough knock inputs
- Nissan VQ35DE (base, 2003-04) not enough injector output (low-side)
- Nissan VQ35DE Rev-Up (2005-06) not enough injector output (low-side)
- Nissan VQ35HR (High-Rev, 2007+) not enough injector output (low-side)
- Honda K20 (i-VTEC 2.0 NA) not enough knock inputs
- Honda K24 (i-VTEC 2.4 NA) not enough knock inputs
- Subaru EJ/FA EJ20 turbo single-AVCS (EJ207 v7-9) not enough knock inputs
- Subaru EJ/FA EJ20 turbo dual-AVCS (EJ207 GRB 2008+) not enough knock inputs
- Subaru EJ/FA EJ25 turbo single-AVCS (EJ257 2004-07) not enough knock inputs
- Subaru EJ/FA EJ25 turbo dual-AVCS (EJ257 2008+) not enough knock inputs
- Subaru EJ/FA FA20D (BRZ/86 NA) not enough map sensor inputs
- Subaru EJ/FA FA20DIT (WRX turbo 2015+) not enough map sensor inputs
- Mazda Rotary 13B-MSP Renesis (RX-8 manual, 6-injector) not enough drive-by-wire throttle motor (h-bridge)
- Mazda Rotary 13B-MSP Renesis (RX-8 auto, 4-injector) not enough drive-by-wire throttle motor (h-bridge)
- Mazda Rotary 20B (Eunos Cosmo 3-rotor) not enough ignition outputs
- BMW S54 (3.2 NA I6, E46 M3) not enough injector output (low-side)
- BMW N54 (3.0 twin-turbo I6) not enough injector output (low-side)
Plan a build around the Link G4+ Atom
Pin table
Connector A carries 4 injector outputs, 4 ignition outputs and 2 trigger inputs.
Show all 29 pins
| Pin | Function |
|---|---|
| A 1 | Inj 4 |
| A 2 | Inj 3 |
| A 3 | Inj 2 |
| A 4 | Inj 1 |
| A 5 | +14V |
| A 7 | Shield/Gnd |
| A 8 | Trig 1 |
| A 9 | Trig 2 |
| A 10 | Ign 4 |
| A 11 | Ign 3 |
| A 12 | Ign 2 |
| A 13 | Ign 1 |
| A 15 | Temp 1 |
| A 16 | Temp 2 |
| A 17 | An Volt 1 |
| A 18 | Aux 4 |
| A 19 | Aux 3 |
| A 20 | Aux 2 |
| A 21 | Aux 1 |
| A 22 | An Volt 2 |
| A 24 | Gnd Out |
| A 25 | Ground |
| A 28 | CAN H |
| A 29 | CAN L |
| A 30 | DI 1 |
| A 31 | DI 2 |
| A 32 | +5V |
| A 33 | An Volt 3 |
| A 34 | Ground |
Other Link ECUs
The closest Link unit is the Link G4+ Monsoon. Against it, this one has 29 pins (the G4+ Monsoon has 34).
Source: Link document AtomQuickstartGuide
Always verify against the manufacturer's manual and your tuner before wiring.