Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Brief description: Overview
- Control module, Trionic T8 (589)
- Generator (2)
- Ignition lock (20)
- Contact, brake light (29)
- Engine oil pressure sensor (44)
- Fuel level sensor (46)
- Engine, fuel pump (323)
- Relay, fuel pump (102)
- Main relay, engine control system (229)
- Relay, oxygen sensor preheating (443)
- Electrical unit, petrol engine (727)
- Contact, clutch, cruise control (133)
- Contact, brake, cruise control (134)
- Boost pressure control valve (179a)
- Coolant temperature sensor (202)
- Mass air flow sensor (205)
- Injector cyl. 1-4 (206a-c)
- Engine oil level sensor (243)
- Ignition coil with integral power module, cyl. 1-4 (320a-c)
- EVAP canister purge valve (321)
- Relay, A/C compressor (156)
- Relay, starting relay (517)
- Camshaft position sensor (345)
- Throttle position sensor (379)
- Manifold absolute pressure sensor (431)
- Diagnostic socket, 16-pin, CARB (445)
- Atmospheric pressure sensor (539)
- Manifold absolute pressure sensor (585)
- Solenoid valve, shut-off EVAP (588)
- Preheated oxygen sensor, front (592)
- Preheated oxygen sensor, rear (593)
- Throttle body actuator unit (604)
- Solenoid valve, turbo by-pass (605)
- Pressure sensor, A/C (620)
- Intake manifold sensor (688)
- CIM (703)
- Pressure sensor, power steering fluid (739)
- CDM (740)
Saab Trionic T8 was developed by Saab and is a highly advanced engine control system. The main task of the ECM is to control the air mass, fuel and ignition.
When the driver presses the accelerator pedal, a pedal position sensor integrated into the pedal is activated.
This information, in the form of a voltage, is connected to the ECM which converts the voltage value into a torque request from the driver.
The torque request is then processed by the ECM with regard to the prevailing operating conditions and restrictions, and the result is an air mass request to achieve the torque requested by the ECM. The driver's requested torque can be higher than that requested by the ECM. This could be because e.g. the maximum engine torque is already being supplied at the current operating time, or due to TCS control or knock control.
The ECM controls the throttle area (opening angle) together with the turbo (wastegate) to achieve the correct torque, i.e. air mass per combustion.
The system has the following advantages:
- Turbo lag can be reduced to a minimum
- Exhaust emissions on load changes are reduced
- Idle control is integrated
- Load compensation is possible over the entire load and speed range
- Effective torque restriction is possible over the entire load and speed range
- Cruise control can easily be integrated into the system
The fuel injection function is sequential and controlled by air mass per combustion and engine speed as the main parameters.
Ignition takes place with individual ignition coils placed on the spark plug concerned. The plug together with the ignition coil and CDM are used to detect combustion and any knocking.
This means that neither a camshaft sensor nor a separate knock sensor are required.
Compared with the earlier Trionic T7 system, the following functions are new:
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.