volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

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Connect VAG1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected by this action.

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Check wiring for open circuit between test box and 5-pin harness connector using to wiring diagram.
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Terminal -2- + socket 102

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Terminal -3- + socket 94

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Terminal -4- + socket 103

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Wire resistance: max. 1.5 ohms

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Also, check wires for short to one another.
Specified value: infinity ohms

If no wiring malfunction is detected and voltage was present between terminals -1- + -5-:

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Replace Engine Control Module (ECM).

Checking secondary winding

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