A4 Quattro Wagon V6-2.8L (AHA) (1998)
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Check wiring for short circuit between ECM/test box and 4-pin harness connector according to wiring diagram.
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Connector terminal 1 to vehicle Ground
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Connector terminal 1 to ECM/test box socket 67
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Connector terminal 1 to terminal 3
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Connector terminal 3 to vehicle Ground
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Specified value: Infinity Ohms
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Check wiring between ECM and 4-pin harness connector for short circuit to battery B+.
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Connector terminal 1 to vehicle Ground
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Connector terminal 3 to vehicle Ground
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Specified value: 0 volts
If wiring is OK:
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Check ECT sensor resistance across terminal 1 (signal) and terminal 3 (ground).
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Check measured resistance value for appropriate temperature range using graph below (N24-0157).
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Range A: 0-50 °C (32-122 °F)
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Range B: 50-100 °C (122-212 °F)