whacked-out lc-1 (heater calibration error)
 

This shit is making me crazy. 90% of the time both outputs read 15.0 or 14.9:1, with the 4-steady blinking lights indicating the need for heater calibration. Its done this every time I've driven it for the past few weeks; last night it worked fine for the entire 3-hour road trip.

I've done the heater calibration several times and I keep getting the error usually immediately.

What do I do now?

Is it wired up 100.00000000000000000000000000000000000% the way outlined in the instructions included with the LC-1? Where is the sensor mounted and has it ever been mounted closer without a heat sink? How are all of your connections made? Where does the unit get it's switched when key on only and not when starting +12V power from?

each GND is on a separate lug on the intake plenum.
sensor is in just at the very back of the downpipe, mounted on top (I used a copper heatsink when it was on the stock DP).
connections are soldered.
power from the big, yellow wire under the steering column (my other gauges stay on when cranking, but the DB gauge shows no #'s when cranking).

Is said big yellow wire switched on ONLY when in the run position? What size heat sink did you use before?

that is correct. However, the other gauges stay "on" when starting the car.

all should be on the same ground as the ECU......the TB ground.


your analog input is your MS, which gets grounded there....

Scott said it, you sir have ground offset issues. I told you to do that specifically a while back. Mine has been working perfectly for 3 months now.

I didn't have this problem when it was hooked up exactly the same way, before the turbo instal.


allow me to quote the rest of that paragraph:
They're on separate bolts on the same piece of metal, close together, consistent with the instructions.

hmmmm.

how am I supposed to determine which of the 5-black wires in the factory harness is the ecu gnd?

A wiring diagram, or the common knowledge on a 1.8L it's grounded at the throttle body.

http://www.megasquirtpnp.com/models/...roundpoint.jpg

Put the LC1 in the garbage or start shopping for a new sensor. If it starts to randomly flake out after working flawlessly its the sensor.

I have a 1.6 chassis car, and there's no telling where I put the GND for the computer. The bundle in the back from the stock harness are all black...I can't identify them.

1.6L grounds at the fuel rail.

http://www.megasquirtpnp.com/models/...s/image020.jpg

the bolt just below the cam cover bolt, the one with the ground wires under it.

ok, but its 2-wires...so which is which? Also, I have two GND wire bundles on the back of my head...how should I identify the computer GND?

Even then, I've followed the directions, and it worked fine on the previous install.

I had this issue with my install. It ended up actually being my power source rather than my grounds. I had a shitty connection on the power and it wasn't getting its full 12 volts to the heater.

I have all my LC-1 grounds to the same lug since it was possible for me FWIW.

Your CPU ground should be 2C (black/green) and your sensor ground is 2A. Those two wires are connected down the road, but they should end up in the same place, along with your wbo2 grounds.

When they are grounded in different locations and your voltage differs to the LC-1 due to the separate grounding points, it doesn't like you.

I grounded the LC1 at two different points and haven't had a single issue so far. About 5k miles on it.

I put the system and signal ground to the BLACK/LIGHT GREEN tab at the location that Brain posted, and the heater ground to the BLACK tab just below the brake master cylinder on the driver's side of the car. I don't remember exactly why I did this, but I'm 99% sure Klaus Whatsisname (the tech chief at Innovate) recommended this expressly, contradicting the language in the LC1 manual.