MaxxECU Documentation

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Pulse inputs

What are Pulse Inputs?

Universal configurable inputs for Crank, Cam, VVT, Flex Fuel, Turbo and Wheel Speed sensors. They replace the fixed-function inputs from MaxxECU GEN1.

Key features:

•All pulse inputs accept digital(Hall) or VR signals.

•Pulse 1 and 2 have selectable supply voltage (5V or 12V) for Hall effect sensors - ideal for crank and cam.

•Can be configured as standard digital inputs with selectable pull-up resistors.

Why it matters:

More flexibility in your wiring. No more "I've run out of speed sensor inputs" or needing adapters because your sensor needs 12V instead of 5V.

pulse settings

Description

Specifies a custom name for the input to clearly identify the connected device or function.

Function

Defines which digital input function is activated when the input becomes active.

Active level

Defines whether the function is triggered on a rising edge (low to high) or falling edge (high to low).

input settings

Input type

Defines how the ECU interprets the electrical signal on the selected input. The setting must match the connected sensor type, as it determines the trigger thresholds and signal processing method.

•Digital input - Uses a square wave logic signal and triggers on defined high/low voltage levels, see below threshold voltage.

•VR input, zero crossing trigger - Triggers when the VR signal crosses zero volts. Requires a -0.16 to 0.16 -> 0,12 / 0.24V peak/peak signal. Used for 99% of all VR-sensors

•VR input, level trigger (bipolar) - Triggers on defined positive and negative voltage levels when zero-crossing is slow, wavy or inconsistent.

Note: Max 25kHz and Max +/-200V.

Pullup resistor

Selects whether to enable the internal 1.0 kOhm pullup resistor to +5V on the input. When enabled, the input is triggered by grounding it. If disabled, a +5V or +12V signal must be applied to activate the input.

•no pullup resistor - No internal pullup connected.

•5v pullup enabled - 1.0 kOhm pullup connected to regulated +5V.

Note: Only available for digital inputs and not supported on all ECUs.

negative input

Selectable negative input configuration for Digital or VR signals. Supports internally grounded mode for normal installations, or floating mode for piggyback applications to avoid disturbing OEM signals.

•grounded - Internally grounded input. Recommended for most installations.

•floating - High-impedance floating input. Used when grounding the a piggybacked sensor sensors ground would interfer when OEM ECUs (ABS and OEM VR-sensors for example).

Note: Only avaible on MaxxECU GEN2 Pulse 1/2.

supply voltage

MaxxECU GEN2 PULSE 1/2 provides a selectable sensor supply on the pink wire in the shielded cable assembly.

•supply voltage off - No voltage output on the pink wire.

•5v supply enabled - Regulated +5V output on pink wire.

•12V supply enabled - +12V output on pink wire.

input thresholds

threshold voltage

Defines the digital input trigger levels, using default 3.5V and 2.0V thresholds for square wave signals or allowing custom rising and falling edge voltage thresholds for precise signal tuning.

•default (3.5/2.0V) - Uses a square wave logic signal and triggers on defined high/low voltage levels.

•Custom settings: Rising edge threshold - Defines the voltage threshold to use for the rising voltage. Must be larger than the falling threshold.

•Custom settings: Falling edge threshold - Defines the voltage threshold to use for the falling voltage.

Note: Only when input type is set to digital input.

threshold voltage

Defines the trigger voltage method, either via manual table-based settings or automatic signal tracking.

•manual voltage setting - Uses a user-defined table to set voltage thresholds.

•Automatic voltage tracking - Automatically adjusts trigger thresholds based on the input signal. Uses a threshold voltage of 17% of the peak value when the engine is not running, and 33% of the peak value when the engine is running.

Note: Only when input type is set to VR.