1994-2002 [Subscribe to Daily Digest] |
The BPV is controlled by a solenoid valve on the firewall. Depending on boost situations and throttle demand, the valve connects the BPV to ports above or below the throttle plate. This provides more control than the passive setup that the T5 had with one port.
The P1110 is because a fluttering has been detected in the intake pressure. This is probably from the valve not being decisively open or closed. But WIS descriptions are often bogus.
I would inspect the three VAC lines involved and their 6 connections. Some VAC lines may be rotting out. The ports/orifices in the TB might be fouled. The solenoid valve might be fouled and could be cleaned out with a mild solvent and some compressed air. See if it can be actuated with a 9VDC radio battery. Some things are not meant to have 12VDC applied and can be damaged. HOWEVER, the WIS shows that the valve gets 12VDC all the time and states that the ECU activates the valve by grounding the other lead. So 12VDC should be ok for this device.
So the fault may be with one of the 3 VAC lines, 6 connections, or the solenoid valve. The solenoid valve could be fouled and cleanable. It may or may not activate. It might be easy to check for an open coil.
Pin 1 on the coil gets +ve 12VDC on the read/green wire. Pin 2 gets a green/blue wire that will be 12VDC when not activated and pulled down to ground when activated. I do not know if the T7 activates at idle, as there is really no need for that, but the T5 passive system opened the BPV at idle.
The workshop manual (WIS), calls the BPV solenoid valve a wastegate valve, which is incorrect at best.
The WIS, as well as stating that the P1110 code is from a pressure fluttering also states elsewhere that P1110 will be generated if the valve does not open during de-acceleration. If the BPV is not opening, there is no vacuum at the BPV or its diaphragm is leaking. Check the BPV for tightness by applying suction by mouth and detecting if it leaks. WIS states that the deactivated solenoid valve connects to below the throttle plate. So their should be vacuum pressure at idle. If the ECU activates the valve at idle, then one can disconnect the solenoid valve electrical connector. Removal of that connector will generate P1658.
If the valve will not flow at idle, with the solenoid deactive one way or the other:
- check for flow from a hose to the solenoid valve, if none, hose or orifice/port is blocked or hose is open somewhere.
- if hose to solenoid valve flows and BPV hose does not, the solenoid valve is fouled or stuck closed, or BPV is blocked or busted open.
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