To flush the throttle assembly, you need an engine intake pipe cleaner. In extreme cases, you can use a carburetor cleaner. If it was not possible to eliminate the malfunction with a cleaner, then the throttle assembly must be replaced. After removing the throttle assembly, the gasket (sealing ring) needs to be replaced. A cleaner and protector for electrical contacts may be required.
Warning! To avoid damage to the actuator, do not attempt to forcibly turn the throttle by applying force to it.
You will need a multimeter to test.
Comment. When installing a new throttle assembly on a vehicle, special diagnostic equipment will be required to check «calibration» throttle position in extreme positions. This operation can be performed at a specialized service station.
Execution sequence
1. We prepare the car for work and disconnect the wire terminal from the negative terminal of the battery («Preparing the car for maintenance and repair»).
2. Loosen the clamp with a Phillips screwdriver and disconnect the air supply hose from the nozzle of the throttle assembly and take the hose down.
3. Pressing the latches, disconnect the wiring harness block from the throttle assembly.
4. Visually check the condition of the terminals of the throttle halal and the block of the wiring harness. To remove oxides, spray the terminals with a cleaner and protect the electrical contacts.
5. With a 5 mm hex wrench, unscrew the four bolts securing the throttle assembly (one of the bolts is not visible in the photo).
6. Remove the throttle assembly.
7. We remove the sealing ring from the flange of the intake manifold receiver.
8. With a multimeter in ohmmeter mode, we measure the resistance of the throttle position sensors between pins 1 and 4. In a serviceable throttle assembly, the resistance should be in the range of 750-1250 ohms.
Warning! When performing the following operation, hold the throttle assembly with the electric drive up so that the cleaning agent cannot flow along the throttle valve axis towards the gear motor and enter the mechanism.
9. With a cleaning agent, we wash off deposits from the inner walls of the throttle assembly and from the throttle valve.
10. We wipe the throttle assembly with a clean rag and blow it with compressed air from a compressor or foot pump.
11. Install the throttle assembly in reverse order, replacing the sealing ring with a new one.
We apply an anaerobic thread locker to the threaded part of the throttle assembly mounting bolts. We tighten the bolts with a torque of 8-12 Nm.
Comment. After turning on the ignition, the throttle assembly must perform a full cycle of checking and the maximum and minimum throttle opening angles. When installing a new throttle assembly, it is necessary to check the performance of the throttle position reprogramming using special diagnostic equipment. The same procedure will be required after replacing the electronic control unit (ECU). It can be performed at a specialized service station with the necessary equipment.
Table 8.2.4. Throttle assembly pin assignments
Output number | Throttle Assembly Electrical Circuit | Output Destination |
1 | Throttle Position Sensors | «Weight» |
2 | Signal from sensor No. 1 | |
3 | Signal from sensor No. 2 | |
4 | Supply voltage | |
5 | Throttle actuator gearmotor | Motor winding output* |
6 | Motor winding output* |
* The polarity of the supply voltage supplied to the electric motor changes depending on which direction the throttle is to be turned.