Jetta L4-1781cc 18L SOHC (ACC) Can - Closed Throttle Position Switch Component Location
Closed Throttle Position Switch: Testing and Inspection
Closed Throttle Position (CTP) Switch, checking/adjusting
Checking
Note:
^ The CTP switch gap can only be checked and adjusted when the plunger is fully retracted.
^ Use VAG 1655 adapter to retract the plunger.
^ The adapter reduces the Battery Positive Voltage (B+) by about 6 Volts.
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Switch ignition OFF.
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Disconnect CTP Switch.
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Connect VAG 1655 adapter to CPT switch and Battery Positive Voltage (B+).
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Touch adapter wire (-) to Ground (GND) until plunger -arrow- is fully retracted.
Note: The Throttle Body has no Ground (GND) connection.
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Push plunger in by hand to stop.
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Check gap -a- with feeler gauge and adjust if necessary using screw -1-.
^ Checking value 0.40-0.50 mm (0.016-0.020 in.)
^ Adjusting value 0.50 mm (0.020 in.)
Operation, checking
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Switch multimeter to resistance range -Ohm-.
CAUTION! Switch multimeter to the appropriate measuring range before connecting the test leads to avoid damaging the electronic components.
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Connect lower terminals of CTP switch using jumper wires from VW 1594 adapter kit.
Resistance:
^ Feeler gauge NOT inserted: infinite Ohms
^ Feeler gauge inserted: 200 Ohms maximum