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2010 vw cc check engine light11/21/2022 ![]() Apply vacuum to the vacuum control switch's input nipple. If you have no vacuum, replace the vacuum line and repeat this step.ĩ. Attach the vacuum gauge to the input hose to test manifold vacuum – with the engine running. Remove the input vacuum line on the control switch. If you still have no vacuum, you may have to remove engine parts to get to the switch.Ĩ. Replace the hose if you find any of this, then repeat the test in step 6. Make not of any hardened spots in the hose, cracks or loose connections. Trace the vacuum line from the check valve to the switch. Locate your vehicle's vacuum control switch. If no vacuum is present or the vacuum readings are low, go to step 7.ħ. If not, you may have to take the vehicle to a shop as further diagnostic testing requires the removal of some engine components. You should have at least 10 to 15 inches of vacuum. Attach the vacuum to the control hose at the check valve. If the valve does not open at all or if it doesn't close, then the valve needs to be replaced.Ħ. Start the engine with the vacuum pump attached and holding a vacuum check valve nipple. For this step, you'll need a vacuum pump available at auto parts stores. If the valve stays open, the valve is bad if it closed, the vacuum control switch is most likely the problem.ĥ. If the valve stays open remove the vacuum control hose and start the engine – the engine does not have to be cold for this test. After a minute does the valve close and stop the air flow? If so, then the check valve is working properly. Check to see if air is coming out of the hose when you start the engine. Remove the pressure hose from the check valve. If you do find a bad fuse or rely, replace it, then repeat this step to ensure you have power at the harness.Ĥ. If you don't have 12 volts, check the fuses and the relay. If you have 12 volts, repeat the first three steps to ensure you did not make a mistake. Test the pump harness connector to ensure that it has 12 volts by checking power between the two terminals in the pump harness plug. Make sure the engine is cold, connect the multimeter, then have someone start the engine to do this step. If the pump runs go to step 3 if not, the pump must be replaced.ģ. The terminal with the brown wire is ground and the other terminal is positive. Apply 12 volts to the pump with jumper wires. Unplug the electrical harness connector from the pump. If air is pumping, then go to step 4 if not, go to step 2.Ģ. Have someone start the engine while you check to see that the pump is running and pumping air out of the end of the hose or outlet nipple (depending on where you disconnected it). Remove the pressure hose from the pump or from the manifold check valve – whichever is easier to reach. Just remember to clear all of the fault codes when you have found and repaired the problem.ġ. Some of the tests may also generate additional fault codes. Some of the follow-up tests may have to wait until the engine completely cools down again – usually a few hours. Most of the diagnostic tests must be done when the engine is completely cold. The secondary air injection ports in the cylinder head may by clogged.The secondary air injection port in the cylinder head may be plugged with carbon.A sensor for the secondary air pressure may be faulty.A leak in the hoses/piping between the secondary air injection pump and the Combi or secondary air injection.A fuse or relay for the secondary air injection pump may be faulty.Potential causes for a P0491 may include: Malfunction Indicator Lamp (MIL) illumination. #2010 vw cc check engine light code#Symptoms of a P0491 engine code may include. Bank #1 is the side of the engine with cylinder #1. The P0491 code tell there is a fault with the system – usually that the secondary air flow is too low on bank 1. This makes them difficult to reach in most cases. If the air pump and check valve are faulty, they are normally easier to replace however, many of the vacuum lines are under or behind the intake manifold. After about minute, the system turns itself off. This ensures a more complete burn of harmful emissions – hydrocarbons. This system pumps fresh air into exhaust system during cold starts to feed oxygen and exhaust gases. The secondary air injection system, commonly found on Audi, BMW, Porsche and VW vehicles – and may be found on other vehicles – features an air pump, an exhaust manifold, an input check valve, vacuum control switch, an electrical input circuit for the vacuum control switch and tons of vacuum hoses. However, specific troubleshooting steps will vary depending on the vehicle. This is a generic powertrain code, which means it covers all makes/models, 1996-newer. Secondary Air Injection System Insufficient Flow (Bank 1) What does that mean? ![]()
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