NOTE: Check to see if you have an eFlexPro or eFlexPro2 device: This guide is intended for the eFlexPro2 or newer harness. We understand there are old videos & instructions floating around about the eFlexPro(1) that state you tap into the MAF/MAP/Throttle Position Sensor with this wire. This is NOT needed with the eFlexPro2.
Verify if you have an eFlexPro(1) or eFlexPro2. This can be seen on your order confirmation, on the back of the Control Unit, or in the eFlexApp. If you ordered a Pro kit on or after 05/24/23, then you have an eFlexPro2. If you’ve confirmed you an eFlexPro2, keep reading.
The eFlexPro comes with one white or grey Analog Input wire pre-installed in your harness. In most cases, the white/grey wire coming from the eFlexPro2 harness does NOT get connected to anything and can be neatly tied/looped. Read below for details.
What is the white/grey wire for?
- The white/grey wire is an optional 0-5V Analog Input typically connected to an aftermarket wideband, such as an AEM X-Series, Ballenger AFR500, Zeitronix ZT, etc.
- This signal input is intended for datalogging via the eFlexTuner (www.eflexfuel.com/us/eflextuner).
- Connecting this input to an aftermarket wideband will allow you to datalog Lambda/AFR’s and fine tune your ethanol fueling with the eFlexTuner software.
- If unused, simply wrap this wire up neatly.
- The eFlexPro2 has a "virtual load sensor," so tapping into a load-based sensor such as a MAF, MAP, or TPS is NOT required for tuning.
- This wire has zero impact on the eFlexPro’s performance or functionality and is only used for optional datalogging for tuning purposes.
Do I need to connect the white/grey wire to anything?
- To use the eFlexPro2 system: NO
- To perform Closed-Loop fueling adjustments via eFlexTuner: NO
- To perform Open-Loop fueling adjustments on a dyno via eFlexTuner: NO
- To perform Open-Loop fueling adjustments via aftermarket wideband / without a dyno: YES
What do I do with the white/grey wire if I do not have an aftermarket wideband?
- Simply wrap this wire up neatly and leave it connected to your harness.
In most cases you DO NOT connect the input wire to anything. Simply tie/loop the white wire neatly and keep attached to the harness. If you will not be installing an aftermarket wideband in your exhaust, you may also connect the input wire to a ground or another 0-5V analog signal if you would like a digital gauge from this input or would like to datalog additional data. Keep in mind this is 100% optional and WILL NOT help in tuning your vehicle without a wideband sensor.
Advanced User Note: For those that need multiple analog input signals, the eFlexPro harness is suited for two analog inputs. The harness comes with Analog 1 pre-installed while the Analog Input 2 can easily be retrofitted. Custom sensor settings can also be created yourself in the eFlexTuner software to suit a different input. Please contact us if you have further questions on this.
Conclusion
If you do not have an aftermarket wideband in your exhaust, the white/grey 0-5V analog input wire in the Pro2 harness is typically NOT connected to anything. If you have an aftermarket wideband installed in your vehicle and wish to open-loop tune without a dyno, you must connect this wire to your wideband.