Technical Description 15
Technical Description
Saab Trionic system overview . . . . . . . . . . . 16
Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
I
Main components of the Saab Trionic
A/C compressor ............ : . . . . . . . . . . . 58
system . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 18
Vehicle speed . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Ignition system, knock control . . . . . . . . . . . . 19
ISAT scan tool communication . . . . . . . . . . . '60
Fuel injection ............. ·. . . . . . . . . . . . . 21
CHECK ENGINE lamp . .. .. . . . . . . . . . . . . 61
Boost pressure control . . . . . . . . . . . . . . . . . . 22
SHIFT UP lamp
Idle speed control . . . . . . . . . . . . . . . . . . . . . . 23
(cars with manual gearbox) . . . . . . . . . . . . . . 62
DRIVE ...................... ·.......... 63
Engine control module inputs . . . . . . . . . . . . 24
Low fuel level . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Engine control module outputs . . . . . . . . . . . 25
OBD II diagnostics
Terms and definitions . . . . . . . . ... . . . . . . . . . 65
Engine control module . . . . . . . . . . . . . . . . . . 26
ECM power supply . .. . .. . . .. . . . . . . . . . . . 28
Fault handling, (I) Catalyst damaging
misfire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Fault handling, (II) fuel system,
Crankshaft position sensor . . . . . . . . . . . . . . 30
emission related misfire . . . . . . . . . . . . . . . . . 68
Manifold absolute pressure sensor . . . . . . . 31
Intake air temperature sensor . . . . . . . . . . . . 32
Engine coolant temperature sensor . . . . . . . 33
Fault handling, (Ill) comprehensive
components .. : . . . . . . . . . . . . . . . . . . . . . . . . 70
Fault criteria, catalyst damaging misfire . . . 72
Fault criteria, emission-related misfire . . . . 7 4
Throttle position sensor . . . . . . . . . . . . . . . . . 34
Fault criteria, fuel system . . . . . . . . . . . . . . . . 76
Ignition discharge module . . . . . . . . . . . . . . . 35
Fault criteria, fuel evaporation . . . . . . . . . . . . 78
Fuel injection . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Fault criteria, oxygen sensor 1 . . . . . . . . . . . 80
Basic boost pressure . . . . . . . . . . . . . . . . . . . 51
Fault criteria, oxyge.n sensor 2 . . . . . . . . . . . 82
Boost pressure control . . . . . . . . . . . . . . . . . . 52
Fault criteria, catalyst . . . . . . . . . . . . . . . . . . .
84
Idle speed control . . . . . . . . . . . . . . . . . . . . . . 54
Fault criteria, other components/functions 86
Fuel evaporation . . . . . . . . . . . . . . . . . . . . . . . 55
Driving a trip . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Saab9000
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