Honda Bmw 5 Service Manual

							
Fuel Injection I 
Engine coolant temperature (ECT) sensor, 
testing 
The ECT sensor is located  on the  front  of the  engine  in the 
coolant~thermostat flange.  The ECT sensor is a  dual temper- 
ature sensor.  One circuit provides coolant  temperature infor- 
mation  to the ECM  while the other  circuit provides  coolant 
temperature information  to the  instrument  cluster. 
The ECM determines the correct ignition timing  and 
airlfuel 
mixture required for the  engine by  monitoring an  applied volt- 
age 
(5 vdc)  to the  sensor.  Thevoltage  drop across the sensor 
varies  as the coolant temperature (sensor resistance) chang- 
es. 
NOTE- 
The  ECT  sensor  is an NTC  (negative temperature  coeffi- 
cient)  type sensor.  In other  words,  as the  temperature rises, 
resistance through  the sensor  decreases. 
If  the  ETC  sensor input is  faulty or non-plausible,  the MIL is il- 
luminated  when OBD 
II fault criteria are  exceeded. The ECM 
assumes  a substitute  value 
(80 C/ 176°F) to maintain  engine 
operation. The ignition timing is  set to a 
conse~ativelsafe ba- 
sic  setting. 
Disconnect harness from 
ECTsensor (A) at  coolant  flange at 
front  of engine. 
- Check  ECT  sensor resistance using a  multimeter at sensor 
terminals 
3 and 4. Peel back protective boot (B) to  ID termi- 
nal  numbers  on connector  housing. 
I ECT sensor resistance @ 20 C (68°F) I 2.2 - 2.7 lkCi 
Engine coolant temperature  (ECT) sensor, 
replacing 
I WARNING- 
/ Due  to risk  ofpersonal  injury, be sure the  engine is cold be- I 
I fore replacin~~~~sensor. - 
- 
I 
- Disconnect ECT  sensor harness. 
- Unscrew  ECT sensor  from cylinder head  and install  new sen- 
sor. 
Use  new copper sealing  washers when installing sensor. 
Replace  any lost coolant. 
Tightening  torque 
ECT sensor to coolant  flange 13 Nm (10 it-lb)   
						

							
130-72 
Fuel Injection 
I Oxygen sensors, replacing 
4 Four Bosch oxygen sensors (2 precatalytic converter sen- 
sors  and 
2 post-catalytic converter  sensors) provide a vary- 
ing voltage signal 
[0.2 vdc  (max. lean)  to 0.8 vdc (max.  rich)] 
to the  ME 
7.2 ECM representing  oxygen content  in the ex- 
haust  gas. 
WARNING- 
Exhaust  manifolds  and pipes can  be hot  enough  to cause  se- 
rious  burns.  Wear suitable heavy gloves  and other appropri- 
ate protection. 
- Using  a special oxygen sensor  socltet, remove the threaded 
sensors from  the exhaust system. 
- If not  already applied, coat  the new  oxygen sensor  threads 
with an anti-seize compound before installation.  Do not  get 
compound on the sensor  tip. 
Tightening  torque 
Oxygen  sensor to exhaust  system 
50 Nm (37 ft-lb) 
Fuel  injectors, removing and installing 
The ME 7.2 system uses ball seat type fuel injectors. This de- 
sign 
prov:des precise sealng  when the iniector is closed 
therebv eiminalinq raw HC (unb~rned fue ) formalion in tne 
intake.-~he fuel inkctors areswitched on and off by the ECM 
at  the  ground  side. 
- Remove  plastic cover from above  fuel rail. See100  Engine 
Removal  and Installation. 
- Disconnected battery negative (-) cable. 
CAUTION- 
Prior  to disconnecting the battea read  the battery  discon- 
nection  cautions  given at the  front  of this  manual.  See 001 
General  Warnings  and Cautions. 
- Remove  both ignition coil  covers. 
Disconnect ignition coil  connectors. 
Remove  left and right ignition coil ground wires, 
4 Remove fuel injector loom  boxes. 
Loosen mounting fasteners 
(A). 
Disconnect electrical plugs (B and D).   
						

							
( Mass Air Flow  Sensor 
1 Intake air  temp. (NTC) 
Sensor qround 
Reference voltage . .  . -., f fitr mass signal I 
Fuel Injection I 
Release fuel injector locking clips  (arrow). 
- Remove fuel injector  loom boxes  and lay to one side. 
- Remove 4  fuel rail mounting  fasteners. 
4 Disconnect fuel line  at quick-disconnect.  To disconnect, 
press  in plastic collar  (arrow) and separate fuel  line. 
WARNING - 
Fuel may be expelled underpressure.  Do not srnol(e or work 
near  heaters  or 
other fire hazards.  Keep a fire extinguisher 
handy.  Before disconnecting fuel  hoses, wrap a cloth around 
fuel  hose 
to absorb anv leakinq fuel. Plug all open  fuel lines. 
- Lifl fuel rail  and injectors straight  up to remove. 
- lnstallation  is reverse  of removal.  Use new injector seals and 
clamps  during installation. 
Mass air flow (MAF) sensor, 
removing and installing 
4 The MAF  sensor is provided with operating power from the 
ECM  relay.  Based  on intake  air mass,  the MAF  sensor  gen- 
erates a varying voltage  (approx.  0.5 
- 4.5 vdc)  as an  input 
signal 
back to  the  ECM.  A separate intalte air temperature 
sensor  is not used. 
- Removing  MAF sensor: 
Remove  upper air filter  housing  locking clips 
Unscrew and remove sensor harness. 
Disconnect air temperature  sensor harness. 
Loosen hose clamp. 
Remove upper filter  housing with sensor. 
- lnstallation  is reverse  of removal   
						

							
130-74 
I Fuel Injection 
Evaporative system  pressure leak 
diagnosis, overview 
The  M62 TU engine is  equipped wlth an evaporative  fuel sys- 
tem pressure leak diagnosis system.  The main component  of 
this system is  the leakdiagnosis  pump (LDP). The function of 
the LDP  is to  pressurize the fuel  tank and the evaporative 
emission system  for the purpose of detecting leaks. 
This  system  iscapable  of detecting a 
lealcas small  as0.5  mm. 
The  LDP, located  in the  left rear wheel housing, contains  the 
following: 
Vacuum chamber. Pneumatic  pump chamber 
DME  activated vacuum  solenoid 
Reed  switch (provides switched voltage 
feedback signal  to 
DME). 
The  vacuum supply  line is in the  wiring harness from  the en- 
gine compartment  and runs  down the  drivers side of the  vehi- 
cle. 
The canister  vent valve  is 
~ntegrated into the LDP, which IS 
electrically controlled  by the  ECM.  The canister vent valve is 
opened to provide fresh air entry into  the fuel system only dur- 
ing  purge operation. 
- Purge operation characteristics: 
Off idle through full throttle:  purge  valve opened by  pulse 
width  modulated (PWM)  control of the  ECM.  PWM duty  cy- 
cle varies by engine operating conditions 
(e.g. warm  idle, 
purge  valve opened  slightly; cold 
idleldecel with engine 
temp 
< 67 C. purge  valve always closed).   
						

							
130-75 
Fuel Injection 
Secondary air injection,  overview 
The secondary air  system pumps  ambient air into  the exhaust 
stream  afteracoid  engine start  to reduce  the warm-up  time of 
the  catalytic converters  and to reduces  HC and CO emis- 
sions.  The ME 
7.2 ECM controls  and monitors  the secondary 
air  injection system.  The secondary air pump operates  at a 
starttemperature  of between 10°C 
(50°F) and 40°C  (104°F). 
and  continues  to operate for  a maximum of 
2 minutes  at idle 
speed. 
The  electric air pump draws  in ambient air  and supplies  it to 
the 
checlc valve.  The vacuum  vent valve (solenoid) switches 
vacuum to  open the 
checlc valve when activated by  the ECM. 
Once  opened,  the checlc 
valve allows air  to be  pumped into 
the  exhaust stream. 
4 The  secondary  air injection system consists  of the  following 
components: 
1. Secondary  air pump  relay 
2. Oxygen  sensors 
3. Catalytic converters 
4.  Electric air pump 
5. Non-return  valve 
6. Vacuum vent valve   
						

							
130-76 
Fuel Injection 
Bosch 
ME 7.2 ECM pin assignments 
Bosch ME 7.2 ECM connectors 
X60001 
X60002 
X60003 
X60004 
X60005 
Table  e. Bosch  ME 7.2 ECM pin assignments 
Connector 
X60001 
I  I I 
8 1 lnput [Terminal 87 voltage supply I Fuse F1 
9-pin, Black 
24-pin, Black 
52-pin, Black 
40-pin, Black 
9-pin, 
Blaclc 
I I I 
9 I  NO^ used I 
Notes 
Ground connector 
X6460 
Ground connector X6460 
Pin  1 
2  3 
4 
5 
Connector X60002 
Ground connector X6460 6 
Pin 
/Type I Descriptionlfunction 1 Notes 
Type 
Ground 
Ground 
7 llnput l~errninai 30  voltage supply I Fuse F4 
Descriptionlfunction 
Not used 
Not  used 
Not used 
Ground  Ground 
Ground  Ground 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
. . - Ground  Input 
Input/ 
output 
input/ 
Output 
Ground 
Ground 
Ground 
Ground 
Ground 
Ground  Heated oxygen sensor, heater ground 
Back-up 
light signal 
CAN-BUS  Low 
CAN-Bus High 
Not used  Not  used 
Heated oxygen sensor, heater ground 
Heated oxygen sensor ground 
Heated oxygen sensor ground 
Heated oxygen sensor ground 
Heated oxygen sensor ground 
Not  used 
Heated oxvaen sensor, heater 
ground 
Heated  oxygen sensor II behind catalylic converter 
Baclcup light switch 
Automatic transmission control module (AGS) 
Automatic transmission control module (AGS) 
Heated  oxygen sensor 
I behind catalytic converter 
Heated  oxygen sensor 
II behind catalytic converter 
Heated  oxygen sensor  I in front  of catalytic converter 
Heated oxygen sensor 
II in front of  catalytic converter 
Heated oxygen sensor 
I behind catalytic converter 
Heated oxygen sensor 
Ii in front  of catalytic converter   
						

							
Fuel lnjection 
I 1- I 
4 /output l~em~erature signal. E-box fan I E-box  fan 
Connector 
X60002 (continued) 
14 
15 
16 
17 
18 
19 
20 
21 
22 
23 
24 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
15 
16 
Input 
Input 
Input 
Input 
Ground 
Output  Heated 
oxygen sensor  signal 
Heated oxygen sensor  signal 
Heated  oxygen sensor  signal 
Heated  oxygen sensor signal 
Not  used 
Heated  oxygen sensor, heater ground 
Not used 
Not used 
Not used 
Terminal  85 control 
Not  used  Heated oxygen sensor 
II behind catalytic converter 
Heated oxygen sensor 
I in  front  of catalytic converter 
Heated  oxygen sensor 
I1 in front  of catalytic converter 
Heated oxygen sensor 
I behind catalytic converter 
Heated oxygen sensor I  in front  of catalytic converter 
Engine control module relay 
Connector 
X60003 
Ground 
Output  Input 
Ground 
Output 
Input 
Input 
Output 
Output 
Input 
Pin  1 
2 
3 
Not  used 
Ground  for electronic components 
Voltage  supply for hot 
film mass  air flow sensor 
Signal EDK (electric throttle actuator)  Hot film mass air flow  sensor, ground 
Electric throttle actuator 
Not  used 
Voltage  signal, terminal 30h 
Alternator 
D+ (terminal 61) signal 
Injection signal 
Injection signal 
VANOS  valve, signal 
Type 
Output 
Output 
Output 
Ground connector 
X6460 
Hot film  mass air flow sensor 
Electric throttle actuator 
Hot film mass air  flow sensor 
Electric throttle actuator, voltage supply 
Starter 
Alternator (generator) 
Cylinder 
7 fuel injection  valve 
Cylinder 6 fuel injection  valve 
VANOS  valve, cylinder 
5-8 
Descriptionlfunction 
Injection signal 
Injection signal 
Signal evaporative emission valve  Notes 
Cylinder 2 fuel injector  valve 
Cylinder 3 fuel injector  valve 
Evaporative emission  valve   
						

							
I Fuel Injection 
Connector X60003 (continued) Electric throttle actuator 
25 
- 27 28 
29 
30 
31 
32 
33 
I I I 
36 jlnput I Knoclc sensor 2, signal 1 Knock  sensor 
I I I 
Input 
26 
Output 
Output 
input 
Output 
Input 
I  I . I 
43 1 ln~ut I Electric throttle actuator,  signal  (Electric throttle actuator 
Ground, electric throttle actuator 
1 Not 
used 
Hot film mass air flow sensor 
34 
- 37 
38 
39 
40 
41 
42 
injection signal 
Injection 
signal 
VANOS valve, signal 
Not  used 
Thermostat  characteristic  map, signal 
Crankshaft position sensor, signal 
Not  used 
35 l~round I~nock sensor,  shield 1 ~nock sensor 
Cylinder 
8 fuel injection valve 
Cylinder 
5 fuel  injection  valve 
VANOS valve,  cylinders 
1-4 
Characteristic map 
Crankshaft positionlrpm sensor 
input 
input 
Ground 
Input 
Output 
Output 
Innut 
Hot film mass air flow sensor, signal 
I 
44 
45  46 
47 
48 
49 
50 
51 
52 
Connector )(GO004 
Knock sensor 4, signal 
Knock sensor, shield 
Oil 
level (thermal) 
Injection, signal 
Injection, signal 
Electric throttle actuator,  signal 
Not used 
Ground 
Crankshaft position  sensor, signal 
Not  used 
Knoclc  sensor,  shield 
Knock sensor 
1, signal 
Knock sensor 
3, signal 
Knock  sensor,  shield 
Secondary  air injection pump  valve, signal 
 
Ground 
Input 
Ground 
input  Input 
Ground 
Input 
I I ... I . ~ 
Knock sensor 
Knocic  sensor 
Oil level sensor 
Cylinder 
4 fuel injection valve 
Cylinder 
1 fuel  injection  valve 
Electric throttle  actuator 
Crankshaft sensor shield 
Crankshaft 
positionlrprn sensor 
Knock  sensor 
Knock sensor 
Knock sensor 
Knock sensor 
Secondary  air injection pump valve 
Notes 
Instrument cluster 
Integrated instrument cluster control 
Secondary air injection pump 
relay 
Pin 
1 
2 
3 
Electric (auxiliary) cooling  fan 4 
Type 
Output 
Output 
Outout 
Descriptionlsignal type 
Charge indicator signal (terminal 
61) 
Voltage  signal, terminal 30h 
Secondam air pump  relay, activation 
Input 
5 
Signal, electric (auxiliary)  cooling fan, signal 
I~ot used   
						

							
Fuel Injection I 
Connector X60004 (continued) 
8 10 
11 
12 
13 
14 
15 
16 
9 
Output 0 
Input 
17 
18 
19 
20 
21 
22 
23 
24 
25 
26 
27 
28 
29 
30 
31 
32 
33 
34 
35 
36 
39 
llnput lsignal l~oolant outlet temperature sensor 
Output 
Output 
Ground 
Input 
Output 
I I - I 
40 /output Istart signal Istarter relay 
Pedal position sensor (PWG), signal 
Output  Input 
Output 
input 
Input 
Input 
Input 
Input 
Input 
input 
Input 
Output 
Input/-output 
Input/-output 
37 
Connector X60003 
Pedal position sensor 
Fuel pump  relay, activation 
Oil pressure indicator  Pedal position sensor (PWG), ground 
Pedal position sensor (PWG), signal 
Pedal position sensor (PWG), power supply 
Not  used 
Not  used  Fuel 
pump relay 
Instrument cluster 
Pedal position sensor 
Pedal position sensor 
Pedal position sensor 
Engine  speed signal output (TD) 
Not used 
Signal 
back-up light 
DM-TL  (diagnostic module, 
tank leakage) 
Signal  oil level sensor 
Right rear wheel  speed, signal 
Clutch pedal position switch, signal 
Brake light switch, signal 
Not used 
Voltage supply,  terminal 
15 
Data link, MFL (multi-function steering wheel) 
Brake light test signal 
AJC  compressor signal 
DM-TL  (diagnostic module, tank 
leakage) 
Not used 
Diagnosis signal 
TxD 
Communication link (EWS) 
Not used 
Not used 
CAN-BUS  hiqh 
38 1 Ground l~round I Coolant outlet temperature sensor 
OED II plug 
Integrated instrument cluster control  module (IKE) 
Light module 
ABSIDSC control module 
Clutch pedal position switch 
Brake light switch 
Fuse 
F14 
Airbag contact coil spring 
Brake light switch 
Heating and 
A/C control module 
OBD 
II plug 
Electronic immobilizer (EWS) 
CAN-Bus link 
CAN-Bus link 
Input/-output  CAN-Bus low   
						

							
Fuel Injection 
Connector X60005 (continued) 
I I I 
6 /output l~erminal 1 signal ICylinder 1 ignition coil 
Cylinder 
2 ignition 
coil 
Cylinder 
3 ignition  coil 
Ground point 
3 
4 
5 
7 
8 -- 9 
Output 
Output 
Ground  Terminal 1 signal 
Terminal 
1 signal 
Ground 
Output 
Output 
Output  Terminal 
1 signal 
Terminal 
1 signal 
p 
Cylinder 4 ignition  coil 
Cylinder 
5 ignition  coil 
Cylinder 
6 ignition  coil