Saab 9000 - Page 216

Fault diagnosis 213
Fault diagnosis with fault symptoms
Engine fails to start, quick test . . . . . . . . . . . 214
Poor driveability . . . . . . . . . . . . . . . . . . . . . . . . 218
Poor performance . . . . . . . . . . . . . . . . . . . . . . 222
Poor performance . . . . . . . . . . . . . . . . . . . . . . 223
I
Dips in idling speed and engine rpm . . . . . . 226
Low boost pressure . . . . . . . . . . . . . . . . . . . . . 232
Fault diagnosis, components . . . . . . . . . . . . . 239
Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
Main relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
Fuel pump relay/fuel pump . . . . . . . . . . . . . . 250
DRIVE................................ 256
A/C...................................
260
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Engine speed . . . . . . . . . . . . . . . . . . . . . . . . . . 264
Fuel consumption . . . . . . . . . . . . . . . . . . . . . . 266
Reversing light switch . . . . . . . . . . . . . . . . . . . 267
CHECK ENGINE lamp (MIL) and SHIFT UP
lamp.................................. 268
Diagnostics communication . . . . . . . . . . . . . . 272
Test readings, control module connections . 276
Before replacing a control module . . . . . . . . 282
Handling control modules . . . . . . . . . . . . . . . 283
Saab 9000