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O2 signal wire

I need to know what color the o2 signal wire is? from the sensor to ecu..

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With an ohm meter you can determine which one is the signal wire by the voltage fluctuating from .800 mv to .150mv

Posted on Aug 25, 2008

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What color wire coming off the engine harness grey or brown connects to the blue signal wire on the 02 sensor which color is the signal wire to the computer


posted 3 times now and forget to say FRONT SENSOR>
right, not the Rear 02 sensor....?
and still no engine stated.!
nor country, (USA calif, usa FED, or canada)
strike three you are out.
sorry.
there are 3 engines,
based on all 3 engine schematics, my wild guess
is 7AFE engine. (the brown wire clue) 1,8L
4AFE (1.6L)
or 1ZZFE engine, DOHC 1.8L

Feb 28, 2016 | 1997 Geo Prizm

Tip

How to make your own O2 Sensor Simulator!


What is an O2 sensor simulator?
The OBD-II cars (1996-1998) have two O2 sensors to measure the amount of oxygen in the exhaust gas. First sensor is measuring it right after gases escape engine and this data is used to adjust fuel trim of the engine, as well as catch some faulty conditions. The second sensor is located after the catalic converter, and is used to detect the health of catalic converter. The ECU expects the signal from the sensor to be oscillating from below 0.4v to above 0.6v, but not above 1.2v, every few seconds while driving.

If you install an aftermarket downpipe with no cat (which is for off-road applications only) the ECU will detect this and indicate an error (MIL). The You can reset the ECU to clear the error code.

How to build Your Own Oxygen Sensor Simulator!
The rest of the page shows how to build an oscillating signal generator with just the right frequency and voltage to fool the ECU. It is based on classical astable operating mode of 555 timer.

Don't attach it directly to the ECU right after assembly. Instead attach it to the battery and check the output. You should get approximately 0v/0.7v flipping about every 3.3 seconds when the car is not running, and 0v/0.9v when the car is running. The current should stay below 10mA.

One LED should be always on whenever the power is supplied. Another LED indicates when the output signal is high, so it should go on and off with the signal.

When tapping the ECU wires, check everything before hooking up the oscillator. The power source should read 0v when the key is removed, about 12.6v when they key is at ACC and about 14.3 when the alternator is running. The resistance between ground wire and the body shield of the ECU should be 0 ohms. And it would be best if you run the car and monitor the voltage of the original oxygen sensor wire before cutting it to make sure you have indeed got the right one. The resistance between ECU PIN #47 and ground is about 1.3 to 1.6 M Ohm.

The original sensor should still be dangling around, or plugged into the downpipe. The reason is that ECU also monitors the resistance of heater circuit inside the sensor. If you want to COMPELTELY disconnect it, you will need to measure the resistance of the heater circuit and install the right resistor between ECU PIN #72 and ECU PIN #31 Anyway, there is no need to do it if you just leave O2 sensor alone and only intercept the oxygen signal wire.

Components
R1 100 K Ohm
R2 1 M Ohm
R3 100 K Ohm
R4 10 K Ohm
C1 4.7 uF
C2 22 uF
D1 1.7v@20mA LED
D2 1.7v@20mA LED
1020059.png
I assume no responsibility for any kind of damages.

on Jul 10, 2010 | Mitsubishi Eclipse Cars & Trucks

1 Answer

What wire from the engine harness grey or brown goes to the blue signal wire on the 02 sensor


posted now 3 times.
no engine stated (of the 3)
no symptoms stated. or job.
front or rear , oBD2 sensor not stated.
on your other post, i answred for all 3 engine
front 02 sensor B1S1.
all 3 engines, the ECU schematics on the 02 pins.

go back and read. your other posts.

Feb 28, 2016 | 1997 Geo Prizm

1 Answer

P0134, p0154


Code 134 is for no activity or signal coming from the O2 sensor for bank one sensor one.
Code 154 is for no activity or signal from bank 2 sensor one. My first guess would be a wiring problem since it is rare for two sensors to fail at the same time.

Aug 12, 2013 | 2006 Kia Sorento 3.5

1 Answer

I need to know which connectors go to which O2 Sensors on my 2005 Jeep Grand Cherokee 4.7L 4WD. Can you help?


Hi, the easiest way to tell is by the signal wire color. These are the signal wire colors:
right front: dark blue/pink stripe
left front: dark blue/light blue stripe
right rear: Brown
left rear: dark blue/yellow stripe

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Apr 17, 2011 | Jeep Grand Cherokee Cars & Trucks

1 Answer

I have a 1998 chevy malibu what wire for the o2 sensor is the signal wire and theres four to choose from


On the front O2 Sensor, the signal wire s Purple. On the rear O2 Sensor, the signal wire is Purple and White. (You will probably have to look at the wire colors on the main harness side of the O2 Sensor connector, not on the sensor itself.)

Nov 19, 2009 | 1998 Chevrolet Malibu

1 Answer

(o2 sensor indicator light cancel switch.) I need to fix this. I changed my o2 sensor and the light hasn't gone off, and it runs the same weather or not the sensor is pluged in or not.


could have wiring damaged need to check if signal from O2 sensor is getting to engine ECU.
can see this in data display using tech2 or scanner O2 sensor reading would be around 450mv all the time indicating open circuit(this is a default reading used by ECU)
or with multi meter back probe ECU connector O2 signal wire to see what reading if any getting to ECU.

Jul 19, 2009 | Isuzu Trooper Cars & Trucks

1 Answer

Replacing O2 Sensor What color are the original: Wires


black is usually power and if there is a blue its the feedback to the pcm

May 13, 2009 | 2004 Buick LeSabre

1 Answer

MAP sensor. Need to know what color wire is the wire that controls the ecu.


The center wire is the signal wire for the computer feedback circuit.

Aug 03, 2008 | 2004 Chevrolet Avalanche

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