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WIRING DIAGRAM
Saab Trionic Engine Management System - Component Location:
COMPONENT LOCATION
22A Main fuse board in short side of dashboard.
29 Brake light switch on the pedal assembly.
102 Fuel pump relay on main relay board in dashboard.
136 Oxygen sensor on front section of exhaust pipe.
156 A/C compressor relay on main relay board in engine bay.
157 Spark plugs
166 3-stage pressure switch for A/C on receiver between front grille and radiator.
171 Antifrost thermostat behind the glove box on the evaporator housing.
179 Boost pressure control valve to the right of the radiator.
202 Temperature sensor on intake manifold flange between cylinders 3 and 4.
203 Throttle position sensor on the throttle body.
206 Injectors at top of intake manifold.
229 Main relay, fuel system, on main relay board in dashboard.
271 Oxygen sensor preheater integrated with oxygen sensor.
272 [1][2]Idle air control valve beside throttle body on right-hand side.
289 Anti-theft alarm control module under left-hand front seat.
321 EVAP canister purge valve in engine bay on right-hand side.
323 Fuel pump in the fuel tank.
345 Crankshaft position sensor below the exhaust manifold.
346 [1][2]Ignition discharge module on camshaft cover.
407 Intake air temperature sensor on intake manifold.
430 Trionic control module behind side trim on right-hand side.
431 Manifold absolute pressure sensor
444 Trionic test socket (for production only).
(H6-10)
445 Data link connector under dashboard by the steering wheel.
(H16-1)
500 Integrated Central Electronics (ICE) control module
LHD:above main relay board in dashboard
RHD:behind main relay board in dashboard
502 Transmission control module (TCM) in cabin on right-hand side of bulkhead partition.
508 Cruise Control system control module in engine bay on right-hand side below the windshield.
509 Sensonic control module, in cabin on right-hand side of bulkhead partition.
540 Main instrument display panel on the dashboard.
547 ABS control module integrated with the brake unit, behind the battery.
553 Relay for heat plates in main fuse box in engine bay.
557 Heat plates in intake manifold passages.
2-pin connector
H2-9 Under the rear seat adjacent to the fuel pump.
4-pin connector
H4-7 Under the rear seat adjacent to the fuel pump.
33-pin connectors
H33-1 Grey connector on bracket below the left-hand A pillar.
H33-2 Black connector on bracket below the left-hand A pillar.
H33-3 Blue connector on bracket below the left-hand A pillar.
H33- On the bulkhead partition behind the glove box.
Grounding Points
G3 Grounding point, luggage compartment, below left-hand rear light cluster.
G7P Grounding point (Power), engine.
G7S Grounding point (Signal), engine.
DESCRIPTION OPERATION
The Trionic is an engine management system in which fuel injection, ignition timing and boost pressure control are integrated into a single system with a common control module.
There are many similarities between the Trionic, LH and Direct Ignition (Electronic ignition) system/Automatic Performance Control (turbocharger boost pressure control system) (DI/APC) systems, but the Trionic incorporates a number of new components and functions.
The most important electrical differences between the Trionic and the earlier LH-DI/APC system are as follows:
^ One control module instead of two.
^ Mass air flow sensor 205 is replaced by a sensor for measuring the pressure in intake manifold 431 and intake air temperature sensor 407.
^ Knock sensor 178 is replaced by a knock sensor function (ionization measurement) integrated into a new [1][2]ignition discharge module (346).
Trionic Control Module
Control module 430 monitors and controls a number of functions.
The Control Module Obtains Information From:
^ Ignition switch 20
^ Brake light switch 29
^ Cruise Control system control module 508
^ ABS control module 547
^ Oxygen sensor 136
^ Antifrost thermostat 171
^ Engine coolant temperature sensor 202
^ Throttle position sensor 203
^ Crankshaft position sensor 345
^ [1][2]Ignition discharge module 346
^ Intake air temperature sensor 407
^ Manifold absolute pressure sensor 431
^ Integrated Central Electronics (ICE) control module 500 (radiator fan)
The Control Module Sends Information To:
^ SHIFT UP indicator lamp 47K
^ Malfunction indicator (CHECK ENGINE) lamp 470
^ Fuel pump relay 102
^ A/C compressor relay 156
^ Boost pressure control valve 179
^ Injectors 206
^ Main relay 229
^ Oxygen sensor preheating element 271
^ [1][2]Idle air control valve 272
^ Canister purge valve 321
^ [1][2]Ignition discharge module 346
^ Data link connector 445
^ Main instrument display panel 540B
^ Sensonic control module 509
Power Supply
The control module is supplied with current (+30 circuit) via fuse 28. Power ground is connected via pins 24 and 25 and signal ground via pin 46.
Fuel Supply
Fuel is supplied through fuel pump 323 building up pressure in the system.
The fuel supply function is adaptive, which means that the supply of fuel is continually adapted to any wear, changes in components, etc. that may occur.
On cars equipped with an anti-theft alarm, fuel pump relay 102 will not operate until the anti-theft alarm has been disarmed.
Ignition Timing
The ignition timing is fixed and cannot be adjusted. Retarded ignition timing is obtained in the following cases:
^ knock Indication
^ fuel shut-off (engine braking with closed throttle butterfly).
Data Link Connector 445
The data link connector for connection of Intelligent Saab Tester (ISAT)Scan Tool is located under the dashboard adjacent to the steering wheel (16-pin connector).
The fuel pump can be started from pin 14 by forcing relay 102 to operate.
Spark Plug Burn-OFF
Automatic spark plug burn-OFF is carried out with a burst of sparks each time the engine is switched OFF. Burn-OFF is carried out in all cylinders simultaneously and lasts for 5 seconds at a rate of 210 sparks per second.
Important: Current for the Trionic control module and [1][2]ignition discharge module is obtained from the main relay of the engine management system, which remains operated for 6 seconds after the engine has been switched OFF.
Upshift Indication 47K
Shift-up indication is provided on cars with a manual gearbox for the US and CA markets.
The system helps the driver to utilize engine performance optimally and so obtain the lowest possible fuel consumption. This is done by means of lamp 47K in the main instrument display panel which lights up when a higher gear should be engaged, i.e. when engine speed and throttle opening reach certain values.
When the load on the engine drops below a certain value (basic injection duration) at the same time as engine speed reaches certain values, the control module grounds lamp 47K via pin 55.
Cars With Automatic Transmission, Transmission Control Module (TCM)
When the selector lever is moved to a position other than P or N, the Trionic control module receives a signal from the TCM control module to compensate for the load increase.
Tachometer (Rev Counter) 110
Tachometer 110 in main instrument display panel 540 is supplied with current via fuse 17. Control pulses are obtained from control module 430 to show engine rpm.
Turbo Pressure Gauge 558
Control module 430 sends a signal, proportional to the intake manifold pressure, to main instrument display panel control module 540. This signal controls the turbo pressure gauge in the main instrument display panel, causing it to give an indication.
The turbo pressure gauge is supplied with current (+15 circuit) via fuse 17.
Exhaust Emission Control, Lambda
The system is connected to an adaptive Lambda system which compensates for changes in the fuel-air mixture due to changes in the fuel system.
Since oxygen sensor 136 continuously measures the oxygen content of the exhaust emissions, the control module can adjust the fuel-air mixture until it is as close as possible to lambda = 1. The sensor is heated by preheater 271, protected by fuse 38.
Boost Pressure Control Valve 179
The boost pressure control valve uses signals from the control module to control the turbo's boost pressure.
The control module is supplied continuously with signals from the sensors and ignition system. On the basis of these signals the control unit regulates the boost pressure control valve and with it the turbo's boost pressure.
Since boost pressure is adapted continuously to the octane rating of the fuel and the conditions under which the engine is made to work, it has been possible to disregard the setting tolerances that must normally be taken into consideration to avoid damaging the engine. Owing to this, the fuel currently used can be utilized to the full.
Air Conditioning, A/C
The Trionic control module obtains information from A/C switch 500, antifrost thermostat 171 and pressure switch 166 to the effect that the A/C system is engaged. The control module then grounds A/C relay 156.
When the A/C compressor is engaged, the control module increases engine idling speed to compensate for the increased load represented by the compressor.
Should the coolant temperature rise to 126 °C, the ICE control module will break the connection to the antifrost thermostat and the compressor will stop.
Coolant Temperature Sensor 202
Coolant temperature sensor 202 is of NTC type and provides the control module with information on the temperature of the coolant. In the event of a break in this signal the control module simulates a temperature of 26 °C.
Throttle Position Sensor 203
Throttle position sensor 203 provides the control module with information on the position of the throttle butterfly valve. The sensor gives the angle continuously from idling speed to wide open throttle.
Malfunction Indicator (CHECK ENGINE) Lamp 470
The "CHECK ENGINE" lamp in main instrument display panel 540 comes on when a serious fault develops in the system.
[1][2]Idle Air Control Valve 272
The idle air control valve is controlled by means of current variations from the Trionic control module. The control module controls the valve opening angle so that a regulated air flow is let past the throttle butterfly.
If a fault should arise in the valve, it will be automatically set to a constant idling speed of about 1200 rpm.
EVAP Canister Purge Valve 321
The purge valve, mounted on the evaporative emission canister, is opened and closed by the control module.
Crankshaft Position Sensor 345
The control module obtains information on the position and speed of the crankshaft from the crankshaft position sensor.
The sensor consists of a slotted ring fitted on the crankshaft at the flywheel end and an inductive sensor mounted on the engine block. The inductive sensor works somewhat like a small alternator, the sine-wave voltage and frequency of which increase with increasing engine speed. The sine-wave voltage alternates between positive and negative polarity, which is accomplished by means of "teeth" on the slotted ring.
This alternating polarity is used by the control module to measure the speed of the engine and to determine which cylinder pair's pistons are at, or on the way up to, TDC.
If the sensor does not work due to a break in the circuit, for instance, the engine will not start.
[1][2]Ignition Discharge Module 346
The ignition discharge module incorporates a transformer which increases the voltage to 400 Volts, a capacitor in which the voltage is stored, integrated ignition coils (not replaceable) and a built-in knock sensing function.
WARNING: The electronic ignition system generates voltages higher than 40,000 Volts. Such voltages may be fatal to persons with a weak heart or those who have a pacemaker. So treat the entire ignition system with great respect.
Temperature Sensor 407
The temperature sensor is located in the intake manifold. It is of NTC type and provides the control module with a continuous signal containing information on the temperature of the intake air.
^ Low temperature = High voltage
^ High temperature = Low voltage
On the basis of the current air pressure (from manifold absolute pressure sensor 431) and the temperature of the intake air, the current air mass can be determined.
Manifold Absolute Pressure (MAP) Sensor 431
The Trionic system incorporates manifold absolute pressure sensor 431 which continuously senses the pressure in the intake manifold.
The MAP sensor passes on this information to the Trionic control module in the form of voltage signals.
Low pressure = Low voltage
High pressure = High voltage
On the basis of the current air pressure and the temperature of the intake air (from intake air temperature sensor 407), the current air mass can be determined.
Heat Plates 555
On cars for certain markets the Trionic system is supplemented with heat plates in the inlet manifold passages to reduce the emission of harmful substances when starting from cold.
If the coolant temperature is below 85°C (185°F) when the engine is started, the control module will ground relay 553, causing it to operate. Current (+30 circuit) is then supplied to the heat plates via maxi fuse 4 in main fuse board 342B. The relay releases when the engine temperature exceeds 85°C (185°F) or after a maximum of 4 minutes.
FAULTS DIAGNOSIS HINTS
The Intelligent Saab Tester Scan Tool is used for fault diagnosis and reading diagnostic trouble codes.