BMW 1989-1995 525i Service Manual page 191

FUEL INJECTION-DME
Table f. ECM Pin Assignment-DME 3.1
130-23
Pin Signal Componentlfunctlon Signal
,
·
-
1
output Fuel pump relay control Fuel pump relay switches with engine running or cranking (crankshaft
position signal must be present for relay switchover)
I -
2
output Idle speed control valve Pulsed ground- close signal (see also pin
29)
-
.
3 output Fuel injector control, cyl.
1
Pulsed ground (injection pulse width in ms) with engine running
I
Fuel injector control. cyl. 3
.
4
output Pulsed ground (injection pulse width in ms) with engine running
I
Fuel injector control. cyl.
2
~
5 output Pulsed ground (injection pulse width in ms) with engine running
6
ground Ground I Ground for fuel injector output stages
-
7
vacant
-
1 -
8
I
output
Check Engine Check engine lamp control ground
I
vacant
-
9
- -
-
-
-
10
vacan t
- -
-
.
- - -
11
output Thrott le valve position (load signal to Voltage (pulse width modulated) depending on throttle position
transmission control module)
-
12
input Throttle position sensor Voltage (0.4·4.2 VDC) varies with throllle position
13 output Mass air flow sensor
Air 1I0w sensor hot wire burn off (voltage for
0.5
seconds after shutdown)
-
1
ground
14
Mass air flow sensor Ground for air flow sensor
1 -
- - -
15
vacant
-
-.-
16
inpul
I
Cylinder identification sensor N C voltage pulse per camshaft revolution (between pin
16
and
44)
17
output ' Fuel consum ption (ti)
I
Fuel consumption outp ut (KVA signal) to instrument cluster
18
vaca nt
-
I -
·
- I
19
I ~cant
-
-
,
·
- -
20
, vacant
-
'- ,
,
I
Prima ry
';'0".
;go;''" 0011 cyl. 00 2-
21
I vacant
-
, -
22
vacant
-
23
output Ignition control (terminal ' ), cyl. no.
2
24
output Ignition control (terminal ' ), cyl. no.
3
Primary signal , ignition coil cyl. no.
3
[ Ignition control (terminal ' ), cyl. no.
1
-
-
25
output Primary signal , ignition coil cyl. no.
1
26
input
I
Power supply (terminal 30 ) Battery voltage (B+) at all times (terminal
30)
27
I output
I
Main relay control Main relay activat ion (to relay terminal
85)
28 ground Ground
Ground for ECM and sensor shielding
-
- -
29
output Idle speed control valve Pulsed ground- open signal (see also pin
2)
-
-
30
vacant
-
-
-
31
output Fuel injector. cyl. no.
5
Pulsed ground (injection pulse width in ms), cyl. no.
5
32
output Fuel injector, cyl. no.
6
Pulsed ground (injection pulse width in rns). cyl. no.
6
- - -
33
output Fuel injector, cyl. no.
4
Pulsed ground (injection pulse width in ms). cyl. no.
4
-
34 ground Ground
Ground for output stages othe r than fuel injection and ignition
35
vacant
[ Evaporative purgev alve corurol
-
-
36
output Pulsed ground with engine at normal lemperature and varying engine load
- -
37
output Oxygen sensor heater relay control Oxygen sensor heater relay activation (ground at terminal 85)
38 vacant
-
-
39
vacant
1 =
-
!
40
vacant
1 -
- -
I
Voltage
(0·5
VDC) varies with engine load
41
input
I
Mass air flow sensor
-
- i
42
vacant
-
1 -
43 ground Ground
I
Ground for temperature sensors (ECT sensor. IAT sensor )
-
-
-
-
co ntinued o n next page
ECM PIN ASSIGNMENTS