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Special tools and workshop equipment required
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◆ V.A.G 1526 A
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◆ V.A.G 1594 A
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◆ V.A.G 1598/31
Test requirements:
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● Fuses for engine electronics OK
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
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● Battery voltage at least 12.7 V
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● Alternator OK
Test sequence
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‒ Connect the V.A.G 1598/31 test box to wiring harness leading to engine control unit; the engine control unit should not be connected .
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‒ Switch the ignition on.
Notes:
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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 multimeter as follows to measure voltage:
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Test box V.A.G 1598/31
Socket
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Measure to
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1
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Battery positive
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2
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Battery positive
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62
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Engine earth
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‒ Specified value: approx. battery voltage
- Connect multimeter as follows to measure voltage:
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Test box V.A.G 1598/31
Socket
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Measure to
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3
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Engine earth
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‒ Switch the ignition on.
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‒ Specified value: approx. battery voltage
If specified values are not attained:
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‒ Check the wiring connections.
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
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‒ Connect multimeter as follows to measure voltage:
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Test box V.A.G 1598/31
Socket
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Measure to
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1211)
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Engine earth
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1) The power supply relay for Motronic -J271 carries voltage on terminal 121 of engine control units after switching of the ignition for up to 15 minutes.
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‒ Switch the ignition on.
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‒ Specified value: approx. battery voltage
If specified value is not attained:
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‒ Check the wiring connections.
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
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‒ Check power supply relay for Motronic -J271 => Page 28-13.
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