Control Module Inputs, Outputs, Bus and Power Supply
Control Module Inputs
- Power supply +30 circuit.
- Power supply +15 circuit.
- Power ground.
- Crankshaft position sensor (345).
- Mass air flow sensor (205).
- Manifold absolute pressure sensor (431).
- Charge air absolute pressure sensor (603).
- Intake air temperature sensor (407).
- Temperature sensor, coolant (202).
- Speed, lead from ABS (547) or TC/ABS (382).
- Maximum permitted torque, lead from TC/ABS (382).
- Pedal position sensor.
- Cruise control switch (141).
- Pedal switches (133, 134).
- Brake light switch (29).
- Throttle position sensor.
- Oxygen sensor (136a).
- Ignition discharge modules (346 F/R).
Control Module Inputs, Bus
- Maximum permitted torque, bus from TCM (502)
- Sport mode selected, bus from TCM (502)
- Selector lever position, automatic gearbox, bus from TCM (502)
- Vehicle speed, left rear wheel, bus from MIU (540)
- Reverse gear selected, manual gearbox, bus from DICE (628)
- A/C request, bus from DICE (628)
- A/C pressure, high-pressure side, bus from DICE (628)
- Power consumption, bus from DICE (628)
- Fast idling speed, bus from DICE (628)
- Immobilizer, bus from TWICE (632)
- Ignition +50 circuit, bus from DICE (628)
- Diagnostics, bus from DICE (628)/diagnostic tool
Further information on the control module's bus inputs and the bus is provided in the section headed Bus Communication.
Control Module
The Saab Trionic T7 primarily controls:
- engine torque
- fuel injection
- ignition.
The control module for the Trionic T7 has a 70-pin connector and is placed in the engine bay in front of the windscreen on the passenger side.
The control module has two processors and receives information from a number of sensors. It processes this information using matrices which are stored in its memory after optimization of engine functions. These important matrices include ignition timing matrices, fuel matrices and mass air flow matrices.
The control module can be damaged by electrostatic discharges or the short-circuiting of any of its outputs. Great care must therefore be taken when handling the control module, such as when carrying out fault diagnosis with a BOB.
The control module is continuously supplied with current from the +30 circuit and loses adapted values and stored diagnostic trouble codes if this current disappears.
The control module is designed to operate on a voltage of between 8 and 16 V when the car is being driven.
When the ignition is switched on, the control module is activated and lights the CHECK ENGINE lamp continuously as a function test. The fuel pump relay is activated for 1 second to build up the fuel pressure and the control module then waits for pulses from the crankshaft position sensor.
Fuel injection is controlled mainly by means of the mass air flow sensor.
Substitute functions are provided for all sensors except the crankshaft position sensor.
The control module contains an integral absolute pressure sensor for barometric pressure. Barometric pressure is used to:
- Correct the purge PWM ratio. At low barometric pressure, a higher PWM ratio is required to achieve the same purge flow.
- Protect the turbo from overrevving at low barometric pressure by limiting the maximum permitted mass air flow per combustion.
When the ignition has been switched off, all sensors that have been supplied with 5 V are activated for 15 minutes. Thereafter only the memory is activated. Adapted values are stored in the memory.
Adaptation is important for performance, driveablity, fuel consumption and emission control. The control module should therefore not be removed nor should its power supply be disconnected unnecessarily.
Diagnostics
- If the control module's ROM or RAM is faulty, diagnostic trouble code P0605 will be generated.
- If any internal function which affects throttle control is faulty, trouble codes P1601-P1611, P1613-P1614 or P1621 will be generated.
- If the barometric pressure sensor is faulty, trouble codes P1632-P1633 will be generated. The charge air pressure's starting value is used as a substitute value and purging is blocked.
Control Module Power Supply
+30
The main relay, fuel pump relay and fuse 17 are supplied with current from the +30 circuit via maxifuse 2. Control module pin 23 is supplied with current from fuse 17.
The control module uses current from the +30 circuit for its memory.
+15
Control module pin 43 is supplied with current from the +15 circuit via fuse 27. The control module is activated when current from the +15 circuit is applied to pin 43.
Diagnostics
If no current from either the +30 or +15 circuits is present, the engine will not start and the system cannot be contacted with the diagnostic tool.
Main relay
When the ignition is ON, the main relay is operated.
Control module pin 1 is supplied with current from pin 87 of the main relay via fuse 14. This connection is used internally to supply the throttle motor with current.
Diagnostics
- If no current is supplied to the control module from the main relay, diagnostic trouble code P1640 will be generated, the throttle will close and the engine will stop.