easy....
P1228 - Wastegate failed open
P0400 - Exhaust EGR malfunction.

I am assuming your Bongo is ... movement is free and actually cleaning the EGR system + valves. Suppose you are going into limp mode ... that after stripping/cleaning the EGR system, vacuum system pipes and wastegate mind!!!

Enjoy!!!

A lot of those items above are operated by the vacuum system, maybe there is a leak in the vacuum system which could include the vacuum pipe to the exhaust valve causing a lack of vacuum? Try this search search.php?keywords=vacuum+system+exhaust

... button, used in Northern Japan, it forces the exhaust gasses back around the engine to get it hot ... of info about removing them and sealing the vacuum pipe!


Just to confirm that i am 100% looking ... Parts are referring to as the "Exhaust Shutter Valve System" ?
Screenshot 2024-05-29 173628.png

... on the passengers side I recently heard a vacuum leak on a part of the passenger side turbo actuator vaccum system.

After taking it apart I found a bodge in a broken t piece so fixed it. Started ... turbo a better clean without removing via the exhaust outlet and moved the actuator rod repeatedly ...

Do NOT bolt unknown cables to the chassis! Black coloured wires are normally chassis/earth in a Mazda vehicle. I suspect if its a red wire then its an old Cold start signal used to close a valve in the exhaust using the vacuum system. Best to un-bolt it insulate the end and tie it back.

NO! The two batteries are in parallel all the time, the switch merely causes the vacuum system to close a valve in the exhaust forcing hot exhaust aback around the engine. In the UK there is a good chance the valve has rusted and will jam in the closed position causing you sever grief!

The valve in the exhaust is operated by the vacuum system via an electrical driven solenoid, the reference is to making sure that the vacuum system is left intact and the outlet that went to the valve is blocked off to preserve the vacuum.

... ATF cooling (parts on order), blowing mid exhaust (now fixed), broken cold start vacuum solenoids and hoses (now fixed), and my gearbox also jumps a bit from 1st to 2nd but fine on 2-3-4.

I'm currently concentrating on the cooling system as this has been a showstopper but intend to do the gearbox ...

... for a long time.
The stock of the Westgate system is stationary.

What we knew:

P0400 is an ... is an ECU fault.
P1228 - error of the EGR vacuum system and control of the Westgate valve.
P1402 ... the environmental friendliness of the car's exhaust, alas, I do not know how much it changes ...

The "gubbins" I had queried turned out to be the quick warm up exhaust valve control system but I hadn't a scooby. All I knew was it was using the vacuum take-off that the fact sheet points to.

... with the air filter so that would leave the exhaust.
I have known for the matting inside the exhaust to become detached and restrict the outlet of gases.
If you have a vacuum gauge tee that into the ... method is to remove it some way down the system preferably as close to the front down pipe as ...

... 15 = Yes = LHO2S inactivation error
16 = Yes = Exhaust gas recirculation (EGR) system
17 = Yes = LHO2S inversion error
23 = Yes = RHO2S inactivation error
24 = Yes = RHO2S inversion error
25 = Yes = Fuel pressure regulator control solenoid
26 = No = Canister purge solenoid
28 = No = EGR vacuum solenoid ...

... from kerbside. Another factor maybe is the exhaust warming the underside bodywork more (warmer ... that the D pillars are used by the vans vent system to draw warm moisture laden cabin air out by the vacuum created when the vehicles is moving adding to the condensation in the trumpet.
Apart from ...

... seals replaced to stop leak on fuel pump
new exhaust mid section and backbox
new rear arches
new ceramic lamp holders for headlights
vacuum system reinstated as per drawing with one way valve
new glowplugs and idle tweaked to stop smoking
air inlet hose to fuel pump replaced
fuel pump diaphragm cleared ...

... pictures I have seen would bolt up to a Bongo exhaust manifold. This would give a greater and broader range of power if the variable geometry system can be controlled effectively. I haven't been able to determine yet if the variable geometry actuation is by boost pressure like a wastegate or by vacuum ...