Idle and Full Throttle Switches (Digifant II)
DIGIFANT II
Idle And Full Throttle Switches - Checking/Adjusting
Idle Switch - Checking
- Check that the throttle stop screw is adjusted properly (see page 18).
- Disconnect the throttle switch connector.
- Connect US 1119 between terminals of the throttle switch plug (1) using set-made jumper harness (see Special Tools list). Set meter to 200 ohm scale.
When the throttle valve is closed (idle), multimeter must read 0.0 ohms (continuity through switch).
If not OK, the switch must be replaced or adjusted so it is closed at idle.
- Open the throttle valve far enough to open the throttle valve switch.
Multimeter must read infinite ohms (OL on US 1119).
Note: If the throttle switches are misadjusted, the engine may surge at idle or cut out during steady driving on light throttle application.
- Insert a 0.20 mm (0.008 in.) feeler gauge between the stop screw and stop (A) and let the throttle valve close completely.
The throttle valve switch must close (multimeter reads 0.0 ohms).
- Open the throttle valve and insert a 0.60 mm (0.024 in.) feeler gauge. Let the throttle valve close completely.
The throttle valve switch must remain open. Multimeter reads infinite ohms (OL on US 1119).
Idle Switch - Adjusting
- Remove throttle housing from intake manifold.
- Loosen the idle switch and move until the specification is obtained.
- Re-tighten screw.
- Re-check the switch closing point with feeler gauges and US 1119.
- Re-install the throttle housing using a new gasket.
Torque: 20 Nm (15 ft-lbs.)
Full Throttle Switch, Checking:
US 1119 set 200 ohm scale connected between terminals of the throttle switch using self-made jumper harness.
- Screw protractor 3084 to top of the throttle shaft (remove fastening nut for throttle lever, if necessary).
Note: If the throttle switches are misadjusted, the engine may surge at idle or cut out during steady driving or light throttle application
- Attach pointer for protractor 3084 at throttle cable mounting bracket.
- Using a screwdriver, open throttle lever completely to the full throttle stop and set protractor 3084 to zero.
- Close throttle approximately 200.
Multimeter reads (OL on US 1119), then push slowly in direction of full throttle stop (arrow) until full throttle switch closes and multimeter returns to 0 ohms.
Full throttle switch must close at 10° ± 20° before full throttle stop.
Adjusting:
- Loosen the full throttle switch and move until specification is obtained.
- Re-tighten the switch screw.
- Re-check the closing point of switch with protractor 3084.
Using The Accelerator Pedal:
- Press the accelerator pedal fully to floor.
- Check that the throttle valve is fully open.
If the throttle valve does not open fully,
- Adjust the accelerator cable.
Checking Voltage Supply
- Disconnect throttle switch connector.
- Connect US 1119 across terminals of connector (2) and set to DC voltage.
- Switch the ignition ON.
Approximately 5.0 Volts
If the voltage is not OK,
- Switch the ignition OFF.
- Re-connect the throttle switch connector.
- Disconnect multi-pin connector from Digitant E.C.U. (Check terminals 6 and 11 for damage.)
- Check for continuity between terminals 6 and 11 of the Digifant E.C.U. (Set US 1119 to 200 ohm scale.)
If there is continuity,
- Replace the E.C.U. and repeat the voltage test.
If there is no continuity,
- Disconnect the throttle switch connector.
- Bridge female terminals of throttle switch connector (2) using bridge end of tool VW 1490.
- Re-check for continuity across terminals 6 and 11 of E.C.U. connector.
If there is continuity,
- Perform the throttle switch checking/adjusting procedure.
If there is still no continuity,
- Repair break in wiring between the Digifant E.C.U. connector and throttle switch connector.