Pulling codes_ chevy impala sets codes_ p00c6 and p228c
I’d like to turn the page back to when I got a phone call from a local undercar shop inquiring if I had the tools to check the ECM connector pin fit on a 2012 Chevrolet Impala with the flex-fuel, 3.6L gasoline direct fuel injection engine. Advantages of pulse width modulation In response to an intermittent loss of power complaint, the shop had found a TSB indicating that loose PCM connections can cause a loss of fuel pressure on the GDI engine’s high-pressure fuel rail and set codes P00C6 and P228C. Pulse width modulation vhdl code While I haven’t invested in a master testing kit, I do maintain an inventory of drill sizes and flat connectors that will test fit and tension on most ECM applications. Single pulse width modulation pdf With scope, scan tool and pin testers in hand, I ventured downtown to the shop to test the pin fit of the Impala’s ECM.
Like many diagnostic technicians, I spend a large part of my spare time reading what I can on the International Automotive Technicians Network ( iATN.net), looking through mechanical engineering and lubrication journals, and scanning articles in trade magazines, just as you’re doing right now. Pulse width modulated dc dc power converters marian k kazimierczuk I’ve also made the rounds of GDI training classes presented by parts suppliers and manufacturers of GDI components, as well. Pulse width modulation project Not to take anything away from training, but the leap from the classroom into the real world of GDI diagnostics is like leaping from a hot sauna into a pool of ice water.
We know, for example, that GDI has a major problem with carbon accumulating on the intake valves, which causes leaking intake valves and, in turn, cylinder misfires. How pulse width modulation works If we read an oil engineering journal, it might describe problems with oil-borne hard carbon particles aggravating timing chain wear. Pulse width modulation for power converters principles and practice Mechanical engineering journals describe how engineers juggle high compression ratios with turbocharging and variable valve timing to achieve optimum cylinder pressures. Pulse width modulation techniques Whatever the case, as GDI vehicles come out of warranty, we’re often finding ourselves struggling to keep up with what I call the “nuances” of GDI diagnosis and repair.
First, the engine features a high 11.5:1 compression ratio, which is typical of GDI engines. Simple pulse width modulation circuit A returnless pulse-modulated, turbine-style fuel pump located in the fuel tank supplies 45-75 psi to the high-pressure fuel pump. Pulse width modulation using op amp To prevent over-pressurization, a mechanical fuel pressure relief valve is built into the electric pump. Pulse width modulation applications Through data feedback provided by an in-line fuel pressure sensor, the ECM commands the desired fuel pressure to the fuel pump control module via GMLAN serial data messaging. Pulse width modulation vhdl A flex-fuel sensor is also located in the fuel line to relay ethanol content to the ECM so it can make the necessary air/fuel ratio corrections for ethanol content. Pulse width modulation lab experiment Due to how ethanol fuels are refined, the sensor will indicate slightly less ethanol content than advertised on the gas pump. Pulse width modulation raspberry pi In my testing, the flex-fuel sensor indicated about 7% ethanol content compared to approximately 10% measured ethanol content.
Suddenly, the engine cleared and began running normally. Led pulse width modulation After a thorough warm-up, we test-drove the Impala and it ran great for at least 10 miles. Advantages and disadvantages of pulse width modulation The history codes revealed a P00C6 (low fuel pressure, cold), P0151 and P0157 (low voltage), B2S1 and B2S2 oxygen sensors, P0300 (general engine misfire), P228C (fuel pressure regulator solenoid performance) and CO 242 and CO 561 (ABS communications).
The P00C6 code indicates low fuel pressure during warm-up. Pulse width modulation amplifier Jumping ahead, the P228C indicates a problem with the high-pressure fuel pump solenoid performance. Pulse width modulation for power electronic converters The P228C also initiates the reduced-power electronic throttle mode. Pulse width modulation formula The P0151 and P0157 codes indicate a zero-voltage condition at the bank 2 upstream and downstream oxygen sensors. Pulse width modulation advantages and disadvantages The CO242 and CO561 ABS codes repeated after being cleared and remained a concern. Unipolar pulse width modulation As for code definitions, the P228C is described in some databases as low fuel pressure at operating temperature.
The Impala’s 3.6L engine produces many windows of data. Pulse width modulation adalah And, there were data lines that I absolutely missed. Define pulse width modulation When reviewing for this article, for example, I found a data line labeled “reduced engine power history” followed by the warning, “fuel system malfunction,” which would have simplified the initial diagnosis.
As for fuel trims, keep in mind that the engine was operating in “limp” mode, which means that the ECM is operating in open-loop on a fixed injector pulse. Pulse width modulation thermostat Consequently, the short-term fuel trims disappeared, leaving only the long-term trim data for analysis. Pulse width modulation and demodulation experiment Going back to the P0151 and P0157 codes, both were confirmed by the long-term fuel trims, which were approximately minus 10 on bank 1 and plus 25 on bank 2. Wiki pulse width modulation Once I became accustomed to the windows of data, I found the engine running normally would produce in the 500 psi range at idle and at 2,175 psi under wide-open throttle (WOT). Pulse width modulation diagram When it ran poorly, the fuel rail would hover in the 100 psi to 200 psi range.
I’m sure you’re wondering how an engine running low on fuel pressure could over-fuel itself, and why bank 1 could over-fuel while bank 2 was starved for fuel. Operation of pulse width modulation I’ll attempt to explain what I determined to be operating strategies: The engine would idle at 2 milliseconds (ms) injector pulse under normal operation. Multiple pulse width modulation But, once code P00C6 was set, the ECM commanded the fuel injectors to 11 ms at idle. Pulse width modulation for power converters pdf I’m suspecting that the over-fueling is an operating strategy used when the fuel rail pressure falls below desired levels.
As for bank 1 over-fueling while bank 2 was under-fueling, I simply didn’t have enough time to follow up in a production shop environment. Pulse width modulation definition Since problems with bank 2 exhaust camshaft will affect operation of the high-pressure pump, I thought I had a camshaft phaser or solenoid malfunction. Pulse width modulation circuit for hho But with no valve timing codes, that wasn’t the case. Pulse width modulation inverter pdf Oddly enough, we discovered that spark plugs from both banks were heavily sooted from over-fueling. Pwm pulse width modulation definition Since the electronic throttle control went into “reduced power” mode, the traction control light illuminated. Sinusoidal pulse width modulation pdf The last operating strategy that I observed was the ECM actually shutting off the engine and disabling the starter when the engine began running poorly. Pulse width modulation servo A one-minute wait restored both the starter and engine functions.
We discovered a missing Schrader valve cap on the fuel supply pump along with a broken release tab on the solenoid connector, which was ample proof that another person had been trying to solve this very same problem.
We then began a physical examination of the engine. Pwm pulse width modulation Removal of the camshaft cover as a precautionary measure indicated that the oil had been regularly changed and the high-pressure fuel pump cam was in perfect condition, as were the bank 2 exhaust valve train and timing chains. Pulse width modulation led dimmer But, the fact that the engine could run very poorly and then suddenly run perfectly indicated an electrical problem. Pulse width modulation inverter design And, the fuel bypass solenoid is the only electrical part of the mechanical high-pressure fuel pump.
Since 2008, many engines have been programmed to deal with various common failures by defaulting into an emergency operating strategy. Pulse width modulation frequency Let’s remember, for example, that this is an 11.5:1 compression ratio engine. Pulse width modulation pwm This engine could conceivably go into severe detonation if the air/fuel mixture leans out when the fuel rail pressure becomes too low. What is pulse width modulation pdf Strictly as speculation, enriching the air/fuel ratio would prevent detonation by cooling the pistons and combustion chambers with gasoline. Pulse width modulation principle When diagnosing modern vehicles, avoid symptom diagnosis. Pulse width modulation of z source inverters In many cases, you’ll find yourself trying to diagnose an “operating strategy” rather than a “symptom.”