BMW 1992 525i Electrical Troubleshooting Manual page 141

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DIGITAL ENGINE ELECTRONICS (DME 1.2, 6-CYLINDER 538)
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Pin
Type
Description/Function Connection 1\'pe of Signal Tester Display
Measurement Notes
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
29 E Vehicle speed sensor
Instrument cluster Square wave km/h
signal
30 Not used
31
E Cylinder Identification sensor Cylinder Identification sensor ON/OFF See status monitoring
(Ignition)
(connection A)
32
A II Measuring signal (KVA signal) Instrument cluster Square wave Multlmeter function pulse Oscilloscope
signal duration
33
Not used
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34 Not used
N
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35 Not used
0
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36 A DME main relay DME main relay terminal 85 Ground ON Diagnosis not possible
I
n
If not fitted, connect
jumper at relay
termlnal30 and 87
37 E U-Batt from Main relay terminal 87 U-Batt Voltage value Perform status monitoring.
DME main relay
Diagnosis not possible H
signal not applied.
Connect jumper terminal
30 and 87 on relay
38
E Drive away protection
On-board computer
> 10V
39
E Programming voltage
Diagnostic connector Only activated for control
unit programming
40
E
NC
compressor signal
Pressure switch, compressor ON/OFF
relay
41
E
Auxiliary fan signal
Full load cutoff relay
12V
ON/OFF
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N