Here’s how to integrate your AEM 30-0334 X-Series wideband using its OBDII pass-through feature to datalog AFR directly in HP Tuners VCM Scanner.
What You Need:
- AEM 30-0334 installed and powered
- OBDII pass-through harness (included with the 30-0334)
- HP Tuners MPVI2, MPVI2+, or MPVI3 interface
- HP Tuners VCM Scanner (latest version)
Hardware Setup:
1. Plug the AEM 30-0334’s OBDII splitter into your vehicle's OBDII port.
2. Connect:
- One leg to the MPVI device
- The other leg to the AEM wideband gauge
3. Ensure both devices are powered before key-on and scanning.
The AEM 30-0334 outputs wideband data over OBDII CAN BUS as a standard SAE PID (like a second oxygen sensor).
Configuring VCM Scanner:
1. Open VCM Scanner with your vehicle connected.
2. Turn the key on (engine running is fine).
3. Go to the Vehicle > Vehicle Controls & Special Functions > Vehicle Communication tab.
4. Click "Repoll for supported parameters" – this forces HP Tuners to detect additional OBDII sensors, including the AEM wideband.
Adding the Wideband to Channels:
1. In the Channels list, click Add Channel.
2. Navigate to:
Channel Selector > External Inputs > AEM X-Series AFR (OBDII)
3. Add that to your channel list.
4. You can now rename it (e.g., "AEM AFR") and log it like any native sensor.
Viewing and Logging AFR:
- Once added, you'll be able to:
- Add it to your graph layout
- Use it in Math Parameters
- Overlay it in logs for FRP review
Please include this AFR channel in all logs you send back for revisions — it's key to dialing in WOT fueling, closed-loop trims, and transient response.
Validation Tip:
Make sure the AFR displayed in VCM Scanner matches what the AEM gauge is reading. If it doesn’t:
- Make sure you’ve repolled parameters after the wideband is connected and powered
- Power cycle the vehicle and re-open VCM Scanner
- Confirm the AEM is set to default OBDII mode (refer to the gauge manual)
