Based on my personal experience, the presence of a check engine light and P0201 code is most likely attributed to a failing or bad fuel injector, specifically in cylinder 1. If the injector operates, then you likely have either an open in the wiring, or a blocked injector. If the code changes, then change the injector. Attach one end of your test light to battery power and the other to ground side of the injector connector. This can easily be checked using a simple test light.
This may help with injector issues in some cases. Then, the codes will be cleared and the vehicle will be taken for test drive to see if the problem comes back and registers to the scanner. I will be happy to help. We are not responsible for any actions you take on your vehicle. Symptoms may be felt before a Check Engine Light is set on the dashboard. Probably damaged bolt, because I strictly followed torque spec. Hello and thanks for your question.
P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208 — Injector circuit open. Should I replace the relay, I have checked the harness and connections and found no problem. You probably changed computers for nothing! Align the alignment holes between the switch and the shift lever. Ignition voltage is supplied directly to the fuel injectors. P0202 may also be seen with misfire codes and lean or rich condition codes.
Check for voltage at the fuel injector connector. With this said, check the fuel injectors on the engine for cylinders 1 and 2 and see if there is any burned wires, loose connections, water standing around the connections, or any fuel around the base of the injectors. A fuel injector Courtesy: waynesgarage. If you swapped injector 1 with injector 2 and the code switched to P0201 it sounds like a bad injector. Replacing injector 1 solved this issue. Testing with a noid light Courtesy: plusquip.
This can also tell technicians how the voltage and resistance changes over time by plotting this data on a graph. What are the causes of P0201 Fault? The engine may be harder to start. Technicians will also need an advanced scan tool that allows live data to be read and graphed will be required as well. By comparing the waveform on the screen to that of a known good injector, you can quickly pinpoint injector circuit faults. If the noid light flashes when cranking the engine, the control circuit is functioning properly. When is the code detected? Which relay would this be and where is it.
The best tool for determining injector health is a digital oscilloscope. Typically, there is always battery power at one of the two injector terminals. Codes present will have their associated freeze frame data taken, which will tell the mechanic the conditions of the vehicle when the code was set, such as engine load, vehicle speed and operating temperature. If you have access to an injector tester, activate the injector and see if it operates. A noid light set is used to check the pulse operation of the fuel injectors.
This can easily be checked using a simple test light. I really do appreciate your help, Ive only owned the car for 4 months and this is the only issue that has come up. Enter the 5 character trouble codes in the search box and submit the search. If you have access to an injector tester, activate the injector and see if it operates. Did you complete the repair? It also seems to lack power in the 1800-2200 rpm range as well when it isn't shuddering.
The technician will then use a noid light installed between the injector and the wiring to test the pulse of the fuel injector. Of course, you can save money by following the correct diagnostic procedures. Fuel injection offers more precise control over the fuel distribution. Insert a 5mm drill bit into the adjustment hole to verify the proper alignment for the neutral position. The code P0203 stands for Injector 3 — Circuit Malfunction. This type of code is mostly associated with other engine misfire codes like , P0202, P0203, etc. If you need further assistance with your , then seek out a professional, such as one from Your Mechanic, to help you.
You simply disconnect the injector and insert the light into connector. Now the part that sucks is having to give back this loaded passat loaner! Next, a visual inspection will be performed for the injector circuit looking for any damaged wiring, loose or broken connectors, or components with damage. Attach one end of your test light to ground and touch the other to the B+ pin on the injector connector — the tight light should illuminate. This will light up the test light every time the injector is being fired by the computer. The days of carburetors are long gone. The manufactures resistance value specifications can be found in the vehicle repair manual. Additionally, this code can be seen in engine misfire, rich and lean conditions.
So, had to remove cam-cover to remove that broken piece from cylinder head. If there is nothing around the injectors, then you can remove one injector harness at a time on the engine and hook up a test light with a paper clip to close off the circuit on the harness. Many problems can easily be found in the harness and connectors. This is for a 2003 Saab 9-3 with fault code P0201 Cylinder 1 Injector Circuit. If not, consult the factory wiring diagram and repair the power side of the circuit as necessary. I have searched for this issue and I come up with a few things like a bad ign harness, a bad injector, or a bad fuel pump. I don't know if this did anything but one day I got frustrated because the shuddering would not go away.