Catalytic converters must be warm before they can work properly. On a cold start the PCM provides a rich mixture to keep the cold engine running.
All that extra fuel goes into the catalytic converter. But the exhaust isn't very hot, because, ah, the engine is pretty cold. GM has employed several strategies to fire up the catalytic converter quicker and reduce cold start emissions. One way is to use a secondary air pump that pumps outside air directly into the catalytic converter.
At this point we are assuming that the fuses and relays are good. You will need to locate the PCM/TCM and the power input signal circuit using your vehicle information source. Unplug the connector from the PCM/TCM, place the ignition switch in the ON position, and probe the appropriate circuit with the positive test lead of the DVOM.
Difficulty Level (Easy)
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Repair Time (20 Min.)
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| Cost Prediction : $ 70-120 |
For eic switch-2 assembly circuit short to ground check engine light is perhaps the most troubling of lights because it could mean so many different things, from you didn't screw the gas cap on tightly enough to look out for pistons flying through the hood and into the stratosphere. The easiest way to find out what this light is telling you is to hook your vehicle up to a scan tool. U1278 error code diagnostic tool looks a little like an oversized calculator and plugs into a communication port inside the car. After you instruct it to perform the scan, it speaks eic switch-2 assembly circuit short to ground with your car's computers to find out exactly what's prompting the light to turn on.
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U1278 is a kind of Network Trouble Code
U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason. |
You can view according U1278 DTC for your car model. We selected several models to see obd2 solutions click and view it.
| +U1278 Mercedes S 550 | +U1278 Nissan Rogue | +U1278 Italdesign Formula | +U1278 Bmw 5 | +U1278 Audi Rs6 |
Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.
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