Honda Bmw 5 Service Manual

130-1 
130 Fuel injection 
General ........................... .I3 0.2 
Tools and test equipment .............. .I3 0.3 
Warnings and cautions ................ .I3 0.5 
Fuel Supply ....................... .I3 0.6 
Relieving system  fuel pressure .......... .I3 0.6 
Siemens MS  41 . 1. ................... 1 30-7 
ECM relay.  testing .................... .I3 0.7 
Mass air flow (MAF)  sensor. 
checking and replacing 
................ .I3 0.9 
Engine coolant temperature (ECT) sensor. 
testing and replacing...

130-2 
/Fuel Injection 
This repair  group covers service and repair  of the Bosch  and 
Siemens engine management systems  used on 
1997 
through 2002 E39 models. Additional engine management 
service  and repair  information  may also be found  in the  fol- 
lowing  repair groups: 
0 020 Maintenance 
120 Ignition  System 
160 Fuel Tank  and Fuel  Pump 
610 Electrical  Component Locations 
OBD  On Board  Diagnostics 
NOTE- 
Camshaft  position sensor, crankshaft speed sensor  and 
knoclc sensors  are...

- 
Fuel Injection 
of diagnostic time  and to help  avoid  incorrect  component re- 
placement  and possible  damage  to system components. 
NOTE- 
* Professional diagnostic scan tools available  at the  time  of 
this printing  include the BMW factory  tools and  a small 
number of  aftermarket  BMW-specific tools.  The 
CS2000 
from Baum  Tools Unlimited,  the Retriever from Assenma- 
chef Specialty  Tools, and the MT2500 from Snap-on are 
three examples. 
In  addition  to the BMW-specific...

Fuel Injection 
Factory DTC scan  tool 
(Tool  No. BMW 
DISplus / GTl / MoDiC Ill) 
4 Fuel  line plugs 
(Tool No. BMW  13 
5 281 1 13 5 282) 
I 
4 Fuel line clamp 
(Tool  No. BMW  13 3 
010) 
4 Fuel  rail to pressure gauge  fitting 
(Tool No. BMW 
13 5 220)   

Fuel Injection 
Warnings and cautions 
For  personal  safety, as well  as the  protection  of sensitive 
electronic  components,  adhere to the  warnings  and cautions 
on  the  following  pages. 
WARNING- 
Gasoline is highly  flammable and its  vapors are explosive. 
Do  not  smoke  or  work  on a car  near  heaters  or  other fire 
hazards when diagnosing  and repairing  fuel system  prob- 
lems.  Have a fire  extinguisher available  in case  of an  emer- 
gency 
Renew fuel  system hoses, clamps  and...

130-6 
Fuel Injection 
Fuel supply  to the  injection  system is  provided by a high pres- 
sure  electric  pump mounted inside  the fuel  tank.  The pump  is 
powered via  the fuel pump relay.  If the relay is faulty,  the fuel 
pump will not  run and  the engine will  not start. 
NOTE- 
* Fuel  delivery  volume and fuel pressure  are critical  to prop- 
er  operation.  Fuel pressure direcfly influences fuel deliv- 
ery 
Fuel pump  relay, fuel pressure  and fuel volume  tests are 
given in 160 Fuel...

Fuel Injection 1 
Working in right  rear of engine compartment: 
Release interior  ventilation filter cover  latch 
(A) and re- 
move cover. 
Release plastic  locking  tab 
(6). 
Rotate duct inward (arrow) to unlock  from bulk head  and 
remove  duct. 
Release spring 
lock (C) to  remove  lower iilter housing. 
Slide filter housing  away from inner  fender  to remove. 
- Remove electrical  box (E-box)  cover fasteners  and remove 
cover. 
NOTE- 
OBD I1 fault  memory  (including  an illuminated MIL)  can...

130-8 
Fuel Injection 
With ignition  off, remove main  relay (K6300) (arrow) in 
E-box. 
- With ignition on  and relay installed, check for  battery voltage 
on  terminal 
2 (87). 
4 Check for voltage  at terminal  8 (30) on relay socket. 
If  battery  voltage  is present, relay  has energized  and is 
functioning  correctly. 
Gmund from 6L (hot ~4th k~y key in Ern 
2I 1 
on position) 
to 
Fuel pump RdiWt Rd from Battery and other system components SOZI~O~~I~Y 
If  battery  voltage is  not present  and...

Fuel Injection I 
Mass  air flow (MAF)  sensor, 
checking and replacing 
4 The hot film  mass air flow  (MAF) sensor  (arrow) sends a 
varying voltage (approx. 
0.5 - 4.5 vdc)  to the ECM  represent- 
ing  the measured intake  air. The air mass input signal  is pro- 
duced electronically  by the 
MAFsensorusing a heated  metal 
film  in the  air flow stream. 
The  ECM  relay provides the operating voltage to the  MAF 
sensor.  As air flows through the MAF sensor, the film  is 
- 
cooled. To maintain...

130-1 0 
Fuel Injection 
Remove  MAF sensor: 
Release clips  from air filter housing 
(A). 
Disconnect harness connector (B). 
Loosen intake boot clamp (C) and remove  MAF sensor. 
Note large sealing O-rings. 
Installation  is reverse  of removal. 
No  adjustment to  MAF sensor  is possible. 
Check  intake hoses  for cracks and vacuum leaks. 
Engine coolant temperature (ECT)  sensor, 
testing and replacing 
R 
1 -4 The ECT sensor is located  below cylinder 1 intake port 
The ECT sensor is  a dual...