BMW 1992 525i Electrical Troubleshooting Manual page 140

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DIGITAL ENGINE ELECTRONICS (DME 1.2, 6-CYLINDER S38)
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Pin Type Description/Function
Connection Type of Signal Tester Display Measurement Notes
14 M Ground,
Ground point Ground
injection valves
15 A
Indicator "Check engine" Instrument cluster Ground Comes on if emission
related error code
is stored, and comes on
during starting
16 A
Injection valves cyl. (1 + 3 + 5) Injection valve Pulsed ground Injection time ti Ground
=
> injector valves
open, see component
activation
17 A Injection valves cyl. (2
+
4
+
6) Injection valve Pulsed ground Injection time ti Ground
=
> injector valves
open, see component
activation
.....
18
E
Hot at all times Termina130 >10V
N
.....
19
M Ground for electronics and
Ground point Ground
0
.
~
sensor shields I
0"'
20
Not used
21 Not used
22 A Idle speed actuator Idle speed actuator Pulsed ground
See component activation
23 A Air pump relay signal Air pump relay Ground
Ground
=
> Air pump on
24
M
Ground remaining output stages Ground point Ground
(except for ignition and injection
valves)
25 A Preheating
Air mass meter Voltage plus for
Signal stops 4 seconds
- 0,5 second
after engine stops
26
M
Ground air flow meter Air mass meter
Ground
27
E
ignition terminal 15 Ignition switch
> 10
v
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