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Test Step
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Test
Equipment
Multimeter
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Test
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Notes
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Nominal Value
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MKM - 587 - A
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of
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between
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Radiator fan relay K51
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31
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Function, radiator fan relay K51
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· Disconnect
wiring harness plug from coolant temperature switch S29 and bridge contacts.
· Ignition
off
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Radiator fan motors M4 and M11
start operating
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· Measure only if
function is not OK.
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Voltmeter
range
20 V, DC
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Voltage supply, radiator fan relay K51
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K51 / Ter. (2)
K51 / Ter. (4)
K51 / Ter. (6)
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Ground
Ground
Ground
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· Remove
radiator fan relay K48.
· Disconnect
wiring harness plug from coolant temperature switch S29 and bridge contacts.
· Ignition
off
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»
11,5 V
»
11,5 V
»
11,5 V
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K51 / Ter. (8)
K51 / Ter. (6)
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Ground
Ground
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· Remove
radiator fan relay K48.
· Disconnect
wiring harness plug from coolant temperature switch S29 and bridge contacts.
· Ignition
on
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»
11,5 V
»
0 V
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Possible cause of fault, trouble - shooting:
1 Fuse F50 defective.
2. Fuse F52 defective.
3. Lead interruption between
K51 / Ter. (6) and coolant temperature switch S29 / lead BRGE.
4. Coolant temperature switch
S29 (see S29).
5. Lead interruption between
coolant temperature switch S29 / lead BR and ground.
6. Lead interruption between
K51 / Ter. (2) and fuse output F50.
7. Lead interruption between
K51 / Ter. (4) and fuse output F52.
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() Terminal in wiring harness plugs
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