Golf GTI L4-1781cc 1.8L SOHC (HT) (1985)
or pushed in)
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measure voltage supply with multimeter US 1 1 19 Note
Preset multimeter to the 20VDC range prior to making test connection.
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operate remote control US 4480/3
^
specification - approx. battery voltage
If NO:
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check for open circuit to duty cycle valve, power supply relay, and control unit, using current flow diagram
-
make corrections if necessary
If NO open circuits
-
replace power supply relay
If voltage spec. is not obtained
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replace control unit
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measure duty cycle valve resistance
^
specification - 2-3 ohms
If NO
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replace duty cycle valve
Control unit, checking
Cold running enrichment mode
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remove wires from thermoswitch (A) and bridge them (B)
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operate remote control US 4480/3
^
duty cycle constant 80 +/- 2%
If NO:
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check for breaks in wiring using current flow diagram
-
make corrections if necessary
If NO breaks in wiring:
-
replace control unit
-
repeat test
Stand-by mode
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remove bridge (B)
-
operate remote control US 4480/3
^
duty cycle constant 50 +/- 2%
If NO
-
check for breaks in wiring using current flow diagram
-
make corrections as necessary
If NO breaks in wiring:
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replace control unit
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check thermoswitch (page 4)
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repeat test