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PostPosted: Mon Sep 18, 2017 8:03 am 
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Full Pressure Turbo

Joined: Fri Jun 07, 2013 7:10 pm
Posts: 821
Car Model: 9000 900 99
I've just put the car back together after changing heater matrix and three aircon. components (condenser, receiver/drier & compressor).

When I switched the ignition on the Check Engine light is flashing error codes at me:

2 flashes & 5 flashes.

On BillJ's 9000.com site this tells me that there is a problem with the MAP sensor & throttle position sensor respectively.

However, the car starts & drives perfectly.

I didn't disconnect the battery while I was doing all this work but did disconnect the MAP sensor while I had the false bulkhead folded forwards out of the way while working in the aquarium.

The T7 APC valve I had fitted 8 months ago is rattling badly when the engine is revved so I've bought a replacement which I need to fit.

Now, if I disconnect the battery for 5-10 minutes will the error codes/flashing "Check Engine" lights go away?

Or is it the rattly APC valve at fault?

Or something else?

TIA S


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PostPosted: Mon Sep 18, 2017 10:00 am 
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Saab Nut

Joined: Wed Mar 02, 2011 11:34 pm
Posts: 1920
Car Model: 9000 Aero
Disconnect that battery for a while and give it a try - it's probably down to something you've moved with it connected.
T7 valves always rattle on T5 management - frightened the life out of me first time I heard it :)


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PostPosted: Tue Sep 19, 2017 2:34 pm 
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Full Pressure Turbo

Joined: Fri Jun 07, 2013 7:10 pm
Posts: 821
Car Model: 9000 900 99
Thanks for the reply; the rattly APC valve is reassuring.

The "Check Engine " light has gone out all by itself!
I drove over 100 miles last night without problem, so it must be OK.

The only issue now is the intermittent nature of the engine function lights (mpg, volts, outside temp) which keep flicking off....

Any ideas?
Change the bulbs?


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PostPosted: Tue Sep 19, 2017 2:39 pm 
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Joined: Thu Oct 08, 2009 10:19 pm
Posts: 3948
Location: Island of Sodor
Car Model: The Pizza Taxi
Ignition switch?

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Might one day get around to the 234 conversion.


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PostPosted: Tue Sep 19, 2017 9:39 pm 
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UKSaabs Trader
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Joined: Wed May 12, 2004 9:53 pm
Posts: 15456
Location: Devon
Sven Rodkarl wrote:
The only issue now is the intermittent nature of the engine function lights (mpg, volts, outside temp) which keep flicking off....

If you're referring to the illumination on the digital display below the speedometer then it has an auto-dimming function driven by the sensor on the clock. Might be worth initially popping the clock out of the dash and re-seating the connectors on it. If the sensor is faulty you can solder a new one in or even just replace the clock for a working one.

If both bulbs go out simultaneously then it's not likely to be the bulbs that are at fault.

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PostPosted: Wed Sep 20, 2017 1:05 pm 
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UKS Addict
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Joined: Sun Oct 15, 2006 7:02 pm
Posts: 6527
Location: Reading, Saabshire
Car Model: Merc A200d AMG 7sp DCT
Sven Rodkarl wrote:
Thanks for the reply; the rattly APC valve is reassuring.

The "Check Engine " light has gone out all by itself!
I drove over 100 miles last night without problem, so it must be OK.

The only issue now is the intermittent nature of the engine function lights (mpg, volts, outside temp) which keep flicking off....

Any ideas?
Change the bulbs?



T5 has no memory. So disconnect the battery for 10mins, with the light switch on. That will discharge the elec system.
Dont forget you will need any Radio codes, plus T5 will need to re-adapt afterwards.

The light issues you mention is down to the "Light Sensitive Resistor" inside your Saab Co-Computer, or Saab Clock unit. Depending on what is fitted. The light resistor is in the bottom left corner, and at this age it fails....

Can be replaced with another light dependant resistor ORP12 ?. Or just remove the resistor and join the two terminals for full brightness all the time.

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92 9000 CSE 2.0t. aka, Wassabi II
02 Laguna II 3.0 V6 24v


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PostPosted: Wed Sep 20, 2017 4:40 pm 
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Full Pressure Turbo

Joined: Fri Jun 07, 2013 7:10 pm
Posts: 821
Car Model: 9000 900 99
Thanks Bill & Paul.

I need to resolve this issue.....

I've had my AC re-gassed this afternoon at my local Saab Indy, Higher Oak Garage in Wrexham.
The system holds pressure, and therefore gas, perfectly well but the ACC still doesn't work.
Higher Oak believe the problem is the lack of a temperature signal because the Electronic Display Unit (EDU) below the speedo. isn't working.
They therefore plan to remove the dash top and the clocks to get at the EDU.

I'm going to warmer climes in the car on Friday evening so time is short.

Is a visible EDU a requirement for the ACC to work?


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PostPosted: Wed Sep 20, 2017 5:15 pm 
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Joined: Wed May 12, 2004 9:53 pm
Posts: 15456
Location: Devon
The EDU lighting won't make any difference to ACC. The garage suspects the EDU itself isn't working.
Paul Taylor wrote:
The light issues you mention is down to the "Light Sensitive Resistor" inside your Saab Co-Computer, or Saab Clock unit. Depending on what is fitted. The light resistor is in the bottom left corner, and at this age it fails....

Can be replaced with another light dependant resistor ORP12 ?.

I seem to remember it is a phototransistor (or a photodiode). Not an LDR, though.

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PostPosted: Wed Sep 20, 2017 6:02 pm 
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Joined: Sun Oct 15, 2006 7:02 pm
Posts: 6527
Location: Reading, Saabshire
Car Model: Merc A200d AMG 7sp DCT
Aircon on the ACC will not work if it thinks outside air temp is 3c or less.
It uses the outside air temp sensor which is under the front spoiler, slightly over to the left side of the car. The connector on the rear of this sensor corrodes really badly. So bad in fact, sometimes you cannot even get it off in one piece.
I suspect this will be the cause.
In past cases i have removed the connector. Cleaned up the connections on the Sensor to clean metal.
Soldered the wires directly to the sensor, then wrapped up in Self-Amalgamating rubber tape to seal it. Job done.

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16 Merc A200d 2.1d AMG. BRABUS D2
92 9000 CSE 2.0t. aka, Wassabi II
02 Laguna II 3.0 V6 24v


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PostPosted: Wed Sep 20, 2017 8:28 pm 
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Full Pressure Turbo

Joined: Fri Jun 07, 2013 7:10 pm
Posts: 821
Car Model: 9000 900 99
Thanks Paul.

I'll have a look at this tomorrow.
If this doesn't sort it its booked back in at Higher Oak on Friday morning for them to have a look.

Here's hoping....


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PostPosted: Thu Sep 21, 2017 6:13 am 
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Full Pressure Turbo

Joined: Fri Jun 07, 2013 7:10 pm
Posts: 821
Car Model: 9000 900 99
Thinking about this further.....

The outside temp. is visible on the EDU despite the intermittent illumination of the EDU.
There is, therefore, a signal from the outside temp. sensor.
Is it weakened by corrosion to prevent a strong enough signal to the ACC or is any signal good enough and the problem is elsewhere?


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