2001 BMW 525i air flow

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Page 410 of 1002

BMW 525i 2001 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
I Fuel Injection 
Table b. Siemens MS 41.1 ECM pin  assignments (continued) 
Pin 
l~iqnal I Componentlfunction 1 Notes I - I I 
5 loutput I Fu

Page 413 of 1002

BMW 525i 2001 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
- -. 
Fuel Injection 
SIEMENS MIS 42.0 AND 43.0 
When system faults  are detected, a  diagnostic trouble  code 
(DTC)  is stored  in the  engi

Page 417 of 1002

BMW 525i 2001 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
- 
Fuel Injection 
ECM relay, testing 
The engine  control  module (ECM) relay is energized  via the 
ECM  and supplies battery  positive 
(Bc

Page 418 of 1002

BMW 525i 2001 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
130-28 
Fuel Injection 
ECM Relay 
4 Check  for voltage  at terminal  6 (30) at reiay socket 
If  battery voltage  is present continue testing

Page 419 of 1002

BMW 525i 2001 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
Fuel Injection 
A faulty MAF sensor can produce the following  problems: 
Difficult  to restart  when  engine  is hot 
Engine starts  then sta

Page 422 of 1002

BMW 525i 2001 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
Fuel Injection 
4 Remove electrical harness connector  (arrow) from IAT sen- 
sor. 
CAUTION- 
Be  sure  the ignition  switch is in  the  off p

Page 423 of 1002

BMW 525i 2001 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
Fuel lniection I 
4 Remove  complete  air filter  housing: 
Disconnect electrical  harness connector  on mass air flow 
sensor 
(A). 
Disconne

Page 425 of 1002

BMW 525i 2001 E39 Workshop Manual Downloaded from www.Manualslib.com manuals search engine 
Fuel Injection 
MS 43.0 throttle valve assembly,  replacing 
The electronic throttle valve assembly forthe MS43.0 system 
is referred to  as