Engine diagnostic code 28

[Immortality]

Yeah, mine does the odd weird change that I've Not been able to put my finger on. Might be time to rip off the pan and see what it looks like.

Never really Looked into these much till you mentioned it with your fault code.

 

[Deuce]

Dirty

Very very dirty.

 

[Deuce]

It was very very dirty

Rag was clean before I started. Smashed it with contact and circuit board cleaner and it came out a bit nicer.
I'll reinstall tomorrow and see how we go.
Note, Google search says 120in/lb for the bolts on it.

 

[Deuce]

Cleared codes, washed car and drove back into the garage.
Code 28 returns.
But have a new pressure manifold switch on order as per earlier link (thanks immortality).
I will update everyone in a couple of weeks once it arrives and is fitted.

 

[Immortality]

Did a trans service today on the Calais. Also pulled out the pressure manifold to inspect and clean. Glad I did. The fluid in the pan is well used but not totally dead or burnt but there is still a huge amount of crap in the switches on the manifold. It's hard to see in the pic but it's all grey, almost like fine wear particles of alloy.

Also took the time to fit a .490 reverse boost valve upgrade and alloy deep pan for good measure.

I'm not 100% sure how this works but from what I can see, when the PCM selects a gear it activates the appropriate solenoid which then pressurises the relevant circuit, somewhere at the end of that circuit is this manifold switch that once the circuit is pressurised switches the relevant switch on the manifold and that tells the PCM the gear change has happened. It would seem that the manifold circuit point is a dead end so any contaminants in the fluid have no-where left to go but accumulate on the switch faces.

 

[Deuce]

Did a trans service today on the Calais. Also pulled out the pressure manifold to inspect and clean. Glad I did. The fluid in the pan is well used but not totally dead or burnt but there is still a huge amount of crap in the switches on the manifold. It's hard to see in the pic but it's all grey, almost like fine wear particles of alloy.
View attachment 219081View attachment 219082View attachment 219083
Also took the time to fit a .490 reverse boost valve upgrade and alloy deep pan for good measure.

I'm not 100% sure how this works but from what I can see, when the PCM selects a gear it activates the appropriate solenoid which then pressurises the relevant circuit, somewhere at the end of that circuit is this manifold switch that once the circuit is pressurised switches the relevant switch on the manifold and that tells the PCM the gear change has happened. It would seem that the manifold circuit point is a dead end so any contaminants in the fluid have no-where left to go but accumulate on the switch faces.

Exactly what I thought about it (end of line and collects the crap)
Your trans fluid looks clean compared to what mine was.

Also I will document it here:
Manifold pressure switch is 5 bolts which 3 require your 10mm socket and 2 required 8mm socket.
All 5 are 11Nm (8 lb-ft)
And my pan bolts were 6mm hex socket heads - 12Nm (9lb-ft)
So definitely will need your small torque wrench and 1/4 drive sockets etc.

 

[losh1971]

Yeah I agree with Deuce that tranny fluid looks pretty red to me.

 

[Deuce]

4 litres of dirty tranny fluid:

 

[Immortality]

She's shifting smooth tonight

 

[Deuce]

Round 2:
Put a new switch in.

Also noted the magnet was no longer glued to the pan, but now stuck to the bottom of the filter. Which I am okay with.