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A6 Quattro Sedan V6-2.8L (AHA) (1998)

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Connect VAG 1598/22 test box to ECM harness connector.Refer to "Scan Tool  Testing/Scan Tool Connecting and Initial Checks/Connecting
VAG 1598/22 Test Box" See: Powertrain Management/Computers and Control Systems/Testing and Inspection 

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Check wiring from ECM terminal 10 to climate control for open circuit or short circuit.

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If wiring is OK, check climate control for correct operation.

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