Air/Fuel Gauge

[ch1mp]

So finally after 3 months i got my air/fuel gauge. I plugged it in to the power and now it's looking nice and pretty... i know which sensor to connect it to but i don't know which wire!on the O2 sensor i have 4 wires. It looks as though there are 2 brown wires, 1 purple, and the last one i can't make out if it's pink or light brown. but ye. i tried on the purple wire but didn't get a reading, it just said 100% lean. i'm too scared to try the other wires in case i get the positive or something and burn it out lol. this is a digital gauge by drift. any help is appreciated

[ch1mp]

sorry i should also mention that with the sensor completely disconnected the reading is still 100% lean. cheers

[Cheap6]

To save you the search:

LHS: +ve is violet/black trace, D16 @ the PCM (=> signal on the gauge)
-ve is violet, D15 @ the PCM (=> [signal] earth on the gauge)

OR

RHS: +ve is grey/black trace, D14 @ the PCM
-ve is grey/yellow trace, D13 @ the PCM

Use both the sensor +ve and the sensor -ve for the gauge inputs as the voltages generated are small and any difference in voltage (potential) across the wires can affect the reading on the gauge. i.e. avoid using just any convenient earth for the signal earth if you can (and you can).

The power and earth wires for the gauge operation/lighting won't be critical so you can use pretty much any convenient ignition and accessory power source and body earth.

Wiring for S/C V6 is different to NA V6.

The pink wire @ each of the sensors is the power wire to the O2 sensor heater, B+ve with ignition on. The black/red trace is the heater earth.

If you made two pairs of pigtail wires, spliced into the wiring for each O2 sensor near the PCM, with male/female connectors (available from Jaycar or similar eg. two of PP-2062), you could easily unplug/plug and swap the gauge from reading one bank of cylinders to the other.

If you remove the connectors from the PCM and remove the plastic back out prevention combs from the terminal blocks you will be able to see the pin letters and numbers cast into the plastic terminal blocks. Splice into the wires 100mm or so from the PCM.

Better luck this time .