BMW 1992 525i Electrical Troubleshooting Manual page 123

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DIGITAL ENGINE ELECTRONICS (DME M1.3, &-CYLINDER M30)
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Pin Type Description/Function
Connection Type of Signal Tester Display Measurement Notes
14
M Ground, injection valves
Ground point Ground
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
Terminal 30 > 10V
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1\)
19 M Ground for electronics and
Ground point Ground
.....
0
shielding the sensors
.
1\)
I
20
Not used
CT
21
Not used
22
A Idle speed actuator Idle speed actuator Pulsed ground See component activation
23
Not used
24 M Ground, remaining output stages Ground point Ground
(except for ignition and injection
valves)
25
Not used
26 M Ground, air flow meter Air flow meter Ground
27
E Ignition terminal15
Ignition switch
>
10V
28
E
Oxygen sensor signal Oxygen sensor Pulsating voltage Voltage value
Can only be measured with
up to approx. 1 V
the engine running at
operating temperature
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