A6 Sedan V6-2.8L (AHA) (1998)
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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 2
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Specified value: Infinity Ohms
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Check wiring between ECM and 2-pin harness connector for short circuit to battery B+.
Specified value: 0 volts
If wiring is OK:
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Check resistance across terminals of IAT sensor -G42-.
Specified value at approx. 20° C (68° F): approx. 1.5-3.5 k Ohms
If resistance is NOT OK:
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Replace intake air temperature sensor -G42-.
Continuation of Test
(when IAT sensor indicates approx. ambient temperature)
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Without disconnecting harness connector, remove IAT sensor -G42-.
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Monitor intake air temperature value in display field 4.
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Spray sensor with commercially available chilling spray and check temperature value in display field 4.
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Temperature value must decrease.
If NOT:
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Replace intake air temperature sensor -G42-.
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Check readiness code.If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code.
Refer to "Moniters, Trips and/or Drive Cycle (Readiness Codes)/Checking Readiness Code" See: Testing and Inspection
Refer to "Moniters, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code See: Testing and Inspection