However, poor connections often result in high resistances in some parts of the circuit, which is why it is important to perform resistance and continuity checks during the diagnostic procedure. Even the best scanners don't update their live reading displays fast enough. We're looking for an open circuit. It's very unlikely that will occur long enough to see with a voltmeter or scanner, but the computer will see it. If you find an open circuit on any measurement, you either aren't making good contact with the meter probe, or that terminal is stretched and not making contact with its mating terminal on the sensor. Your gas mileage will also be terrible, so you should try and fix it as soon as you can.
What do they mean and what do I need to do or change? Those two readings should add up to what you found in the last paragraph. Next, measure from the ground terminal to the signal terminal, then from the 5. The first way you'll find close to 0. This sensor controls engine operation such as fuel cut. The same precision is needed on the ground wire. Start by consulting the repair information for your vehicle to determine which wire is the signal wire.
It only tells you what's going on with that component. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Thanks You can't have 12 volts on the ground wire. Typically, the sensor should read around 4. Before it breaks completely it will develop some resistance and a circuit can still work, but not correctly.
So you should chech it on our car models. This tells you where to start testing. I had the codes read,p1870,p0122. They stay in memory and you may have fixed something 20 starts ago and not know it. I did a scan Transmission codes 0122 and 2201, engine codes p0122 tps and p1122 tps came up. For an intermittent, refer to. Does sensor value change abruptly while a related connector is being moved? This guy really gets into the problem, and can really help you find the cause of the trouble codes with the Sierra.
The sluggishness is uniform throughout the range of the accerator. Measuring the voltage on the ground wire my way will give you 0. You'll actually have more resistance than that just in the meter leads, so 3 or 4 ohms would not be unexpected. Inspect connector seals for being there and for being damaged. So, instead of following the directions to move the meter's ground probe to the battery's positive terminal, leave it on ground or the negative post, and take all three voltage readings directly.
This enables you to spot any fleeting problems. Remember, these are manufacturer specific codes only. Start by consulting the repair information for your vehicle to determine which pin on the connector is power and which is ground. With the scope, you can view the voltage signal as a wave form. Then you can squeeze the part that touches the sensor's terminal.
The monitors the throttle position of the throttle plate inside the throttle body in relation to your foot position on the gas pedal. If it will help, write all these values down. What I am showing in this video is how to quickly test a throttle position sensor and wiring. Does the scan tool indicate that this diagnostic failed this ignition? You probably don't have voltage going to the sensor, or else the harness is bad between the sensor and the computer. This allows vacuum to b. In fact, that is the most common cause of this fault code.
Open the throttle slowly; you should see the voltage increase smoothly as the throttle is opened. The signal wire is where I get strange reading. Jun 21, 2011 Welcome to the world of improper diagnostics. You should find an open circuit. That is how we take electrical pressure readings directly.
Now don't ask yourself; What should you do with P0122 code? If there are any inaccuracies, or anything that you feel could improve the article, please feel free to comment or message. Hold light flashed on then malfunction light came on. And lets face it, if the service engine light is on then you need it now! Please use the form on our Contact Page to get in touch with us. Be careful to just touch the terminals with the meter's probe. We certainly understand how frustrating it can be to look for a code definition and have it not online when you need it. It is way too easy to make a mistake when you're in a hurry and taking lots of readings very quickly.
Electrical tape should never be used on a car or truck. Resistances are always taken with the ignition switch off because the meter supplies its own power. There's a big difference between the two. As an example, if you find 8,500 ohms between the ground and 5. If you have 75 millivolts, that will set the fault code for signal voltage too low.