However, when the fault occurs, both these values sit at 0 Before the error they sit at around 89. I suspect as others have said on here, it is the Simtec 70 ECU thats now at fault.Noticed that when I clear the code, and monitor the IAC integrator and IAC Adaption slope, they are both functioning. Once I rev it and hold the revs around 2500 or above the code kicks in and the car sound like a bag of spanners, revs are bouncing around despite holding the throttle steady. And it will stay clear whilst the car idles. Replaced Coil pack, throttle body, performed Field remedy 2033 (earthing one) Had new injectors (new manifold didnt appear to be heating up on Cylinder 4)Īnd still i have this damned P0505 error. Found cracks on the flexi pipe before the CAT.replaced. Started investigating, found a cracked exhaust manifold, replaced. Wouldnt idle, sounded extremely rough above 2500 rpm. The optimum value stored in the ECM is determined by taking into consideration various engine conditions, such as during warm-up, deceleration, and engine load (air conditioner, power steering, and cooling fan operation).My Vectra is doing my head in, been off the road since November. The target engine speed is the lowest speed at which the engine can operate steadily. The ECM then controls the step position of the IACV-AAC valve so that engine speed coincides with the target value memorized in ECM. The crankshaft position sensor (POS) detects the actual engine speed and sends a signal to the ECM. when the step advances, the opening is enlarged.) The opening of the valve is varied to allow for optimum control of the engine idling speed. One step of IACV-AAC valve movement causes the respective opening of the air bypass passage. This valve is actuated by a step motor built into the valve, which moves the valve in the axial direction in steps corresponding to the Engine Control Module ( ECM) output signals. The IACV-AAC valve changes the opening of the air bypass passage to control the amount of auxiliary air. Idle speed is controlled through fine adjustment of the amount of air that bypasses the throttle valve via Idle Air Control Valve IACV) and Auxiliary Air Control AAC) Valve. This system automatically controls engine idle speed to a specified level.
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December 2022
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