Golf GTI L4-1781cc 1.8L SOHC (HT) (1985)
Oxygen sensor regulating function of control unit
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remove wires from thermoswitch
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pull apart connector for oxygen sensor cable and hold connector (1) of the green cable on ground (A)
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operate remote control US 4480/3
^
duty cycle must exceed 87%
If NO:
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check for breaks in wiring using current flow diagram
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make corrections if necessary
If NO breaks in wiring:
control unit is defective
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replace control unit
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connect a 1.5 volt (flashlight type) battery as follows:
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(+) terminal to oxygen sensor green wire, (-) to ground
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operate remote control US 4480/3
^
duty cycle must fall below 20%
If NO:
control unit is defective
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replace control unit
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repeat test
Oxygen Sensor, Checking
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engine oil temperature, min. 80~C (176~F)
^
idle adjustment OK
^
control unit oxygen regulating function OK
^
remote control US 4480/3 not connected
^
oxygen sensor connected
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connect test equipment for measuring OXS duty cycle
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start engine and let idle for at least 2 min.