Innovate Motorsports LM-2 - Manual (Page 41)

Document # 31-0008 LM2_Manual_1.3.doc 41
6.8 Attenuating a Tach Signal
The problem of an erratic tach signal happens if there is a lot of ringing at high voltages.
To counteract this, it is sometimes necessary to attenuate the tach signal by about 30dB
or so. This is accomplished with a 20k or 50k variable potentiometer which can be
purchased at Radio Shack or any electronics store.
Wiring
1. Connect the tach signal to terminal A.
2. Connect terminal B to the tach signal input of the LM-2’s analog cable which is
the Black wire with a White stripe.
3. Connect the terminal C to Ground. (Do not connect this to the Blue tach signal
ground on the LM-2’s analog cable.)
Tuning RPM
1. Turn the pot all the way to the right (until no RPM is registered).
2. Start turning the pot to the left and stop when you start registering a tach signal
and the LM-2 displays an 'R' on the status bar.
6.9 OBD II connection diagnostic trace
In the rare situation where the LM-2 is not able to connect to the vehicle’s OBD-II
protocol creating a trace file will greatly aid in diagnosing the problem.
1. Press and hold the Mode button to go into the Configuration Menu Screen.
2. Select OBD-II and press the Enter button.
3. Use the Arrow buttons to scroll down to Start Trace File and press the Enter
button. A 't' will alternate (or stay steady) in the "O" spot on the status bar.
4. Connect the LM-2 to the vehicle’s OBD-II port. Wait one minute.
5. Wait one minute, then either press Record to stop, or select "Stop Trace File"
from OBD-II menu.
6. A file named OBDIIxx.TXT will be saved on the SD card (xx counts up to 99).
7. E-mail this file along with the year, make, and model of the vehicle to the support
staff at Innovate Motorsports.