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Topic Review (Newest First)
01-26-2015 10:21 AM
Drew in Houston From WIS

P1106: Charge Air Absolute Pressure Sensor Circuit. Performance Problem.

-Check Engine
-Engine speed drops slower than normal when accelerator pedal is releases.

Enable Criteria:
-Crankshaft stationary, even after ignition OFF. Car Stationary. The other two absolute pressure sensors deviate less than 10 kPa from each other.

P1108 Charge Air Absolute Pressure Sensor Circuit. Short to B+

-Check Engine
-Engine speed drops slower than normal when accelerator pedal is releases.

-Engine running and the voltage is higher than 4.815 V for more than 5 seconds.

For this one it says "Note: Jiggle the leads and in-line connectors at various points and in different directions to detect any intermittent breaks or short circuits in the wiring."

Don't know how far you may want to troubleshoot, but I'd check the wiring first because of the second code. Here's what you need to take a first look if you want to do that before throwing parts at it. The sensors themselves are generally pretty reliable.


01-26-2015 05:56 AM
Mike Brennan From Saab World I think?

Saab Trionic T7 is an engine management system (control module) that governs air mass, fuel and ignition.

As the driver depresses the accelerator pedal, the accelerator cable turns the pedal position sensor located in the throttle body. The system requests a torque and the throttle motor turns the throttle until the throttle position sensor value corresponds with the requested value. The charge air volume is also increased if necessary. The system has the following advantages:

• Turbo lag can be compensated.
• Emissions can be reduced in connection with load changes.
• Integrated idle speed control.
• Load compensation possible throughout the whole load and speed range.
• Efficient torque limitation as necessary.
• Cruise control easy to integrate.

Fuel injection is sequential and is controlled by the air mass flow.

Ignition is performed by an ignition discharge module. The spark plugs are used as sensors to detect combustion and knocking. This means that neither a camshaft position sensor nor a knock sensor is required.

Saab Trionic T7 has been developed by Saab and has great development potential. Compared with earlier systems, the Trionic T5 has the following additional features:

Throttle body (604)
• Contains the pedal position sensor (turned by the accelerator cable), the throttle motor and the throttle position sensor.
• Informs the control module of the driver's torque request.
• Turns the throttle to the position determined by the control module.

Limp-home solenoid (607)
• Fed by a relay, the limp-home solenoid (640) is governed by the control module.
• Mechanically connects the accelerator cable to the throttle spindle of a fault arises in the throttle body or any of its leads. The mechanism must be reset manually.

Charge air absolute pressure sensor (603)
• Informs the control module of the pressure level in front of the throttle.
• Used for determining density of air in front of the throttle. Dense air requires a smaller throttle angle.

Intake air temperature sensor (407)
• Informs the control module of the temperature in front of the throttle.
• Used for determining density of air in front of the throttle. Dense air requires a smaller throttle angle.

Manifold absolute pressure sensor (431)
• Informs the control module of the pressure in front of the throttle. • Used to correct the value from the mass air flow sensor during rapid load changes.

Turbo bypass control valve (605)
• Connects the bypass valve control in front of the throttle.
• When the accelerator pedal is released, the bypass valve control line is connected after the throttle.
Prevents noise and varying charge pressure.

Mass air flow sensor (205)
• Sends frequency modulated information on the air mass flow to the control module. • Acts as the main sensor for fuel injection.
Like (on SaabWorld)
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01-26-2015 05:48 AM
Mike Brennan P1108 Dual Alternator Battery Lamp Circuit Malfunction. So, unless this code chart is wrong you really only have the one real problem and that is with 1106.
01-26-2015 05:40 AM
Mike Brennan The CAAPS is located on the air intake pipe between the intercooler and the throttle body. Just above the turbo diverter valve. Very easy to change,maybe 10 minutes work.
Here is the part:
01-25-2015 10:39 AM
CAAP sensor errors

Hi. I am getting recurring error codes P1106 and P1108. I have found out that these are related to the Charge Absolute Air Pressure sensor. I have a 2000 9-5 wagon with 2.3l engine.
Where is this sensor? Does anyone have pics of it? Do I have to remove the heat shield over the turbo to get at it? I saw on one bulletin board that there isn't an aftermarket part and only the Saab will work. Many thanks for any help. Jackson

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