BMW 525i 1998 E39 Workshop Manual

BMW 525i 1998 E39 Workshop Manual 525i 1998 E39 BMW BMW https://www.carmanualsonline.info/img/1/2822/w960_2822-0.png BMW 525i 1998 E39 Workshop Manual
Trending: alternator belt, fuel tank removal, service interval, fuse box location, transmission, check oil, roof

Page 351 of 1002

BMW 525i 1998 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
120-3 
Ignition System 
Warnings and cautions 
The ignition system  produces dangerous  high voltage. In ad- 
dition  the sensitive electronic

Page 352 of 1002

BMW 525i 1998 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
I lgnition System 
Additional information about DTCs and engine management 
system electronic system  diagnosis is provided in 
OBD On- 
Board

Page 353 of 1002

BMW 525i 1998 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
Lnition switch 
4 The positive (+) power supply  to the ignition coils  comes to 
the ignition  switch via an unloader  relay. When  the ignit

Page 354 of 1002

BMW 525i 1998 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
120-6 
lgnition System 
lgnition system, troubleshooting 
Troubleshooting ignition  system faults should begin with an 
interrogation  of the

Page 355 of 1002

BMW 525i 1998 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
120-7 
Ignition System 
Spark plug electrode  gap /Too small /TOO big 
Table 
b. Ignition  secondary voltage diagnostics 
Secondary 
voltage l

Page 356 of 1002

BMW 525i 1998 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
I lgnition System 
4 Normal combustion  period at idle. 
4 Normal  oscilloscope  pattern for ignition  system  at idle. 
15. 15 
4 lgnition  v

Page 357 of 1002

BMW 525i 1998 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
< Ignition voltage peaks in response  to sudden  acceleration 
load: 
1. Normal ignition  pattern. Beginning  of dying out  pattern 
is  not

Page 358 of 1002

BMW 525i 1998 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
.- 
ignition System 
Disabling ignition system 
The ignition system operates in a lethal voltage range and 
should be disabled  any time  engi

Page 359 of 1002

BMW 525i 1998 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
Ignition System 
- Turn ignition on and  check for battery voltage, 
If  battery voltage is not present, 
checlt wire between  termi- 
nal 
15

Page 360 of 1002

BMW 525i 1998 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
120-1 2 
ignition System 
Crankshaftspeedsensor 
Crankshaft speed sensor, replacing (M52, M52 TU and 
M54 engines) 
4 Crankshaft speed sensor
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