Golf L4-2.0L (ABA) (1996)
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Connect VAG 1598/18 test box to ECM wiring harness.
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Disconnect 2-pin connector -1- from Intake Air Temperature sensor -G72- -2-.
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Check wiring between test box and 2-pin connector for open circuit according to wiring diagram.
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Terminal 1 and test box socket 36
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Terminal 2 and test box socket 33
Resistance: Maximum 1.5 ohms
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Check wiring between test box and 2-pin connector terminal 2 for short circuit to wire terminal 1 or to vehicle Ground, according to wiring
diagram.
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Terminal 2 and test box socket 36.
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Terminal 2 and vehicle Ground.
Specification: Infinite Ohms
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Additionally, check both wires for short circuit to battery positive (B+).
Specification: Infinite Ohms
If no malfunction in wiring is detected:
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Measure resistance at IAT sensor -G72- terminals 1 and 2, resistance values, see resistance chart listed below.
Sensor Resistance Chart
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The diagram applies to Engine Coolant Temperature sensor -G62- and intake Air Temperature sensor -G72-.
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Scale A shows resistance values for Temperature range 0°- 50°C (32°-122° F) and Scale B shows the values for Temperature range 50°-100°C
(122°-212° F).
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If the specification is not attained:
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Replace IAT sensor -G72-.
Continuation Of Check When Display = Ambient Temperature