BMW 1992 525i Electrical Troubleshooting Manual page 156

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DIGITAL ENGINE ELECTRONICS (DME M3.1, &-CYLINDER M50)
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Pin lYPe Description/Function Connection 1\'pe of Signal Tester Display
Measurement Notes
27 A DME main relay
OME main relay terminal 85
Ground ON
Diagnosis not possible H
not fitted - connect jumper
at relay terminal 30 and 87
28
M Ground for electronics and Ground point Ground
shielding the sensors
29 A Idle speed actuator Idle speed actuator Pulsed ground Component activation
30 Not used
31 A Injection valve cyl. 5 Injection valve Pulsed ground
Injection time ti
Ground
=
>
Injector valves
open, see component
activation
32 A Injection valve cyt. 6 Injection valve Pulsed ground Injection time II Ground
=
>
Injector valves
open, see component
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activation
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0
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A Injection valve cyl. 4 Injection valve Pulsed ground Injection time tl Ground
=
>
Injector valves 33
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open, see component
n
activation
34 M Ground, remaining output stages Ground point Ground
(except for ignition and EV}
35 Not used
36 A Fuel evaporation control valve TEvalve Pulsed ground CLOSED/OPEN
Perform component acti-
vatlon, ground
=
>
closed
37 A Oxygen sensor heating
Oxygen sensor relay
Ground ON
Ground
=
>
Heating
activated
38 Not used
39 Not used
40
Not used
41 E Signal air mass meter
Hot wire air mass meter
0 ... 5V Load signal In ms
See status monitoring
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