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Technical Product Manual
Fault analysis and repairs 1318
7 Wiring diagrams, fault analysis
TU00-1318-0200302 © Siemens VDO Trading GmbH Section 7 7–5
Section 7: Wiring diagrams, fault analysis • Edition 12/2005
7.4 Fault analysis workflow sample
Example of workflow
Fig. 7-2 Measuring adapter for flat cable and test adapter
Remark
Observe the anti-static protective measures. (See Chapter 1, page 7-4)
Before starting any measurement, ensure that the unit's operating voltage is correct.
When measuring resistance, disconnect from power and remove connectors "A" ... "D".
.
Use the test adapter (4), 1601.9900.010.000, when carrying out input or output
measurements on the minitimer connectors.
All measurements are based on
: Speed coding switch (1) (switches 2, 3 and 9 set)
.
: RPM coding switch (2) (switches 3, 4 and 10 set)
k
8000imp
km
----------------------
=
k
4000imp
1000rev
----------------------
=
Line 1
d
c
b
L
ine 2
d
c
b
a
a
etc.
1 Speed coding switch 3 Connector not coded 5 Flat cable measuring adapter
2 RPM coding switch 4 Test adapter
2
5
4
1
3
a
b
c
d
Component 1 voltage check Troubleshooting
Resistance check
Visual check
Component 1
Component 2
Troubleshooting
1 Error Component 1 Component 2
Measuring point
colour
2 V unit
v = 0 km/h
v = 60 km/h
24 V unit
v = 0 km/h
v = 60 km/h
Component 1 Component 2
2
Clockwork
mechanism
defective
v board M
Quartz electronics
K
Flat cable
23+, 24+
1.5 V ... 9.5 V
Faulty measuring
values, replace v
board.
Connect measuring device between the two coil connections,
(MP1, MP2 and. 23, 24). Measuring value: 1.5...2k
Ω
Faulty measuring value.
Replace clockwork mechanism.
etc.
Illumination correct v board M
Check lamp holder and contact.
Illumination J
Flat cable
25 +
12 V 24 V
(on lamp holder)
24 V unit: 25 W (fitted)
52 W (removed) 12 V unit:
10 W (fitted)12 W (removed)
Faulty measuring value.
Replace lamp; measuring value
correct. Replace flat cable.
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