Cable Inner details New Cables : Our specially manufactured cable bigger is still enclose in the tough outer fibreglass sheath for added protection. Would that mean maybe my 2 heater wires on each one may just be backwards?. I would have to double check at work but I think the blue is the signal to the pcm and the white is a ground for the signal side of the O2. The measurement cell appears to be mirroring what the heater voltage is doing. Initial work Due to the lean code initially present, it was prudent to check for possible causes.
Have you read about our new blue star program? Tests manipulating the air system These tests should be performed while the engine is at idle. The heater is also drawing current as expected, although it is perhaps a little low should be about 4 A, is about 2 A. It will then level off to what it was before the snap throttle test. Note also that the pin numbering changes but positions remain the same for the 4. This resistance is used to determine pump current in a differential amplifier mode. However some people have used starter spray or other flammable substance, however propane is safer and easier. Along with recent cable changes, we have also changed our connector supplier and there are now a couple of small variants in the circular 8-pin connector used in our cables.
That hint points to the heater circuit, as this starts up immediately on engine start, whereas the controller doesn't pay attention to the sensor until it is warmed up. Do this for each pin. Also, in the image at right, the small wire one from bottom is actually green. I ordered them online and the wiring instructions did not have my vehicle on it. From Gnob on this board for the sake of explaination. Instead of using the blue connectors with the o2 sensor, i soldered and put some heat shrink tubing over it.
For example: using helium, carbon dioxide, etc. Noted problems with the car The car showed periodic check engine lights during the previous year before it was worked on. They told me to match the colors up because they were essentially the same. It is possible to backprobe all of the pins, but this would not be the safest nor easiest way. Overall current is limited by a series resistance plus Ri internal resistance to 500 microamps peak to peak, or 250 microamps around the V bias point V bias is set to 2. I switch to with the ground but I'm still geting a check engine light after the car warms up.
So even tho I never found a layout for the plug, Im pretty sure I have it figured out from all the different tests it was asking to do. I am not concerned as of now as everything is running smoothly. Once this had been done the 16555 code vanished, leaving the oxygen sensors as the only faults. There are several methods available to measure the resistance of the reference cell, including disabling the pump circuit and applying a known constant current across the reference cell and measuring the resultant voltage, finally re-enabling the pump circuit. About 15-20 minutes of driving I stopped at the store for a drink, started the car back up, and about 2 minutes later at a stop light the check engine light came on. The next check is to test the resistances between heater pins and other pins. The guy at the smog shop said its probably the o2 sensors, maf, or something else cant remember and that its common.
Snap throttle test Figure 5 This test is superfluous, but fitting with the belt and braces approach. The sensor Images 1 to 4 consists of a heating element, a traditional zirconia type switching sensor known as a Nernst cell and an oxygen ion pumping cell. The O2 sensor signal is a small voltage and if it is working and generating a voltage within range, then it should work. What I do remember is the following: The Blue is signal + the original o2 wire. Although it is hard to be certain due to the low quality current clamp in use. To date, Bosch has produced 1 billion Oxygen Sensors.
On a four wire sensor you will need to connect the Ground and one side of the Heater together and ground that point, then that will leave you with the two important wires being the +12v and signal. Have you read about our new blue star program? All of these checks should read open or at least very high resistance 1 Mohm or more. Testing of them can now proceed. This is my first post here. I wasn't able to locate a wiring diagram for the sensors harness on there tho. Overview of the testing Once the scope is wired up correctly the test can begin. Cold engine running Figure 3 The engine is still cold, but the sensor and heater are up to temperature here and so it can start to function.
In 2007 a new improved one part cable was introduced at. I took it to smog it, failed. The codes im getting are: P0135 Oxygen Sensor Heater Circuit Malfunction - Bank 1 Sensor 1. If that is the harness does anyone know the wires in which i can connect to. While the heater circuit itself was functioning fine, the leakage between heater circuit and Nernst cell was causing problems. The ground wire is the one that registers a resistance on the multimeter.