ECU spec · AEM

AEM Infinity Series 5 pinout and specs

Checked against the maker's documents 27 September 2026

AEM Infinity Series 5 is a 80-pin wire-in AEM ECU on 1 connector: C1 (80 pins).

It has 8 injector outputs and 8 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 6 dedicated trigger inputs; the maker does not say which sensor type. Two knock inputs cover both banks of a V engine. It has an onboard wideband controller, so a sensor wires straight in.

It has H-bridge outputs labelled for an electronic throttle, so drive-by-wire runs from the ECU itself. Two CAN buses handle dashes, PDMs and expansion. One output can switch 12V as well as ground.

Spec sheet

ConnectorsC1 (80)80 pins in this profile
Injector outputs8saturated (high-impedance only)
Ignition outputs8logic-level: smart coils, or an igniter for dumb coils
Dedicated trigger inputs6sensor type not stated
Knock inputs2
Onboard wideband controllers1
Onboard MAP sensorNot listed by the maker
CAN buses2
Drive-by-wireYes
High-side outputs1
Half-bridge outputs6H-bridge pairs for a throttle motor or stepper
5V sensor supply2 pins

Worth knowing

  • Infinity-508.
  • AEM lists 2 CAN buses but marks CAN B as reserved in the pinout.

Which builds it suits

Of the 58 swap presets in the planner, 10 fit as they are and 47 fit with add-ons; 1 does not fit at all. The add-on it asks for most often is the AEM X-Series Inline Wideband UEGO (30-0310). Where it falls short, it is usually not enough knock inputs. The planner fills anything a preset leaves open with its ordinary defaults, so your own build may land differently.

It runs the Nissan RB25DET Neo (R34), Honda K20 (i-VTEC 2.0 NA) and Mazda Rotary 13B-MSP Renesis (RX-8 manual, 6-injector) presets with nothing added. The GM LS L76 (Gen4 6.0 alum) needs AEM X-Series Inline Wideband UEGO (30-0310). The Nissan VQ35DE (base, 2003-04) needs AEM X-Series Inline Wideband UEGO (30-0310). It can't run the BMW S54 (3.2 NA I6, E46 M3): not enough knock inputs.

Fits as it is 10
Fits with add-ons 47
Does not fit 1

Plan a build around the AEM Infinity Series 5

Pin table

Connector C1 carries 8 injector outputs, 8 ignition outputs and 6 trigger inputs.

Show all 80 pins
PinFunction
C1 C1-1Lowside 4 (1.7A, 12V pull-up)
C1 C1-2Lowside 5 (6A)
C1 C1-3Injector 7 (508) / Lowside 6 (506)
C1 C1-4Injector 8 (508) / Lowside 7 (506)
C1 C1-5UEGO 1 Heat
C1 C1-6UEGO 1 IA
C1 C1-7UEGO 1 IP
C1 C1-8UEGO 1 UN
C1 C1-9UEGO 1 VM
C1 C1-10Battery Perm Power
C1 C1-11Coil 4
C1 C1-12Coil 3
C1 C1-13Coil 2
C1 C1-14Coil 1
C1 C1-15Coil 6
C1 C1-16Coil 5
C1 C1-17Crankshaft Position Sensor VR+
C1 C1-18Crankshaft Position Sensor VR-
C1 C1-19Camshaft Position Sensor 1 VR-
C1 C1-20Camshaft Position Sensor 1 VR+
C1 C1-21Lowside 2 (1.7A)
C1 C1-22Lowside 3 (6A)
C1 C1-23Analog Sensor Ground
C1 C1-24Analog Sensor Ground
C1 C1-25Crankshaft Position Sensor Hall
C1 C1-26Camshaft Position Sensor 1 Hall
C1 C1-27Digital 2
C1 C1-28Dig3 [Hz]/Duty
C1 C1-29Dig4 [Hz]/Duty / RS232 Rx
C1 C1-30Digital 5 / RS232 Tx
C1 C1-31Coil 7 (508) / Dig6 (506)
C1 C1-32Coil 8 (508) / Digital 7 (506)
C1 C1-33Battery Ground
C1 C1-34CANL A
C1 C1-35CANH A
C1 C1-36CanL B (reserved)
C1 C1-37CanH B (reserved)
C1 C1-38Analog Temp 1 (default coolant)
C1 C1-39Analog Temp 2 (default air)
C1 C1-40Analog Temp 3 (default oil)
C1 C1-41Lowside 0 (1.7A)
C1 C1-42Lowside 1 (6A)
C1 C1-43Battery Ground
C1 C1-44Knock Sensor 1
C1 C1-45Knock Sensor 2
C1 C1-46Battery Ground
C1 C1-47EFI Main Relay Switched Ground Output (0.7A)
C1 C1-48Ignition Switch (10K pulldown)
C1 C1-49+5V Sensor Power (regulated, fused)
C1 C1-50+5V Sensor Power (regulated, fused)
C1 C1-51Analog 7 (default primary TPS / DBW TPSA)
C1 C1-52Analog 8 (default MAP)
C1 C1-53Analog 9 (default fuel pressure)
C1 C1-54VR+ 2
C1 C1-55VR- 2
C1 C1-56VR- 3
C1 C1-57VR+ 3
C1 C1-58Highside 0 (2.6A solid-state relay)
C1 C1-59Stepper 1B (±1.4A)
C1 C1-60Stepper 2B
C1 C1-61DBW1 Motor - (5A H-bridge)
C1 C1-62DBW1 Motor + (5A H-bridge)
C1 C1-63Main Relay Power Input (12V)
C1 C1-64Injector 6
C1 C1-65Injector 5
C1 C1-66Injector 4
C1 C1-67Battery Ground
C1 C1-68Main Relay Power Input (12V)
C1 C1-69Analog 19
C1 C1-70Analog 18
C1 C1-71Analog 16
C1 C1-72Flash Enable (10K pulldown)
C1 C1-73Analog 13 (default oil pressure)
C1 C1-74Analog 11
C1 C1-75Analog 10
C1 C1-76Injector 3
C1 C1-77Injector 2
C1 C1-78Injector 1
C1 C1-79Stepper 2A (±1.4A)
C1 C1-80Stepper 1A (±1.4A)

Other AEM ECUs

The closest AEM unit is the AEM Infinity Series 3. Against it, this one has 8 injector outputs (the Infinity Series 3 has 10), 8 ignition outputs (the Infinity Series 3 has 9), 1 wideband controller (the Infinity Series 3 has 0) and 2 CAN buses (the Infinity Series 3 has 1).

Source: AEM document techlibrary_hardware-specification-infinity-series-5

Always verify against the manufacturer's manual and your tuner before wiring.

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