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Checking ignition system
Checking control unit power supply
Test requirements:
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● Fuse for engine control unit OK
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
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● Battery voltage at least 11 V
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● Alternator OK
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‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit; do not connect the engine control unit .
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‒ Switch the ignition on.
Note:
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◆ The positive voltage supply to the engine control unit is provided via contact 3 (terminal 15) and contact 62 (terminal 30).
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◆ The earth connection to the engine control unit is provided via contact 1 and contact 2.
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‒ Connect the V.A.G 1526 handheld multimeter for voltage measurement to the following contacts on the test box:
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Contact
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Specification
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3 + 2
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approx. battery voltage
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3 + 1
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approx. battery voltage
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62 + 2
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approx. battery voltage
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If specifications are not attained:
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‒ Check the wiring connections.
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
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