Checking the idle speed
Verification conditions:
- The engine coolant temperature is 80-95°C.
- The engine oil temperature is above 80°C.
- Lights, electric cooling fan and all accessories are off.
- Transmission in neutral (position «R» or «N» for vehicles with A/T)
- The steering wheel is in a position corresponding to the rectilinear movement of the car.
1. Install a tachometer or connect a scan tool to the data acquisition connector in the fuse box.
2. Run the engine to idle.
3. Check up a corner of an advancing of ignition and, if necessary, adjust it.
4. Set the engine speed to 2000 to 3000 rpm for more than 5 seconds.
5. Let the engine idle for 2 minutes.
6. Check up turns of idling. If they are outside the specified limits, check the idle speed control system.
- Idle speed - 700±100 rpm.
Note. Idle speed adjustment is not normally required as the system controls the idle speed.
Speed control with adjusting screw
Regulation conditions:
- Engine coolant temperature from 80 to 90°C.
- The engine lubrication temperature is above 80°C.
- Lighting devices, an electric fan and all other consumers of electricity are turned off.
- The steering wheel is in the straight ahead position of the vehicle.
1. Disconnect the throttle control cable.
2. Attach a tachometer.
3. Ground the output of the ignition timing adjustment connector.
Start the engine and set the idle speed.
Check ignition timing.
Adjust the ignition timing if necessary.
- The standard value of the ignition timing is 5°± 2°before TDC.
4. Turn off the ignition and ground the output of the data line connector. In addition, connect a scanning tool to this connector.
5. Run the engine for at least 5 seconds at 2000 to 3000 rpm.
Let the engine idle for 2 minutes.
Record the idle speed.
If it does not fit within the limits specified by the specification, adjust it with the adjusting screw.
- Rated idle speed - 700±100 rpm
Fuel pump check
1. Turn the ignition switch to the OFF position.
2. To test the operation of the pump, apply battery voltage to the output of the fuel pump drive.
Note. The fuel pump is located inside the tank, so to hear the noise of its operation, you need to remove the cap from the fuel tank neck.
3. Pinch the fuel hose with your fingers to feel the presence of fuel pressure.
Fuel pressure check
1. Reduce pressure in hoses and fuel lines as follows.
- Disconnect the fuel pump harness.
- Start the engine and after it stops, turn the ignition switch to the OFF position.
- Disconnect the negative battery terminal.
- Connect the fuel pump harness.
2. Disconnect the high pressure fuel hose from the fuel supply side.
Warning. Cover the hose connection with a rag to prevent leakage of fuel remaining in the line.
3. Using a fuel pressure sensor adapter (09353-33000, 09353-24000, 09353-24100), install a fuel pressure gauge on the fuel supply line.
4. Connect the negative battery lead.
5. Apply voltage to the output of the fuel pump drive and let it run; check for fuel leaks from the pressure gauge or connectors.
6. Disconnect the vacuum hose from the pressure regulator and close the end of the hose. Measure fuel pressure at idle.
- The standard pressure value is 320-340 kPa
7. Measure the fuel pressure when the vacuum hose is connected to the pressure regulator.
- Standard pressure value - About 270 kPa
8. If the measurement results do not match the standard value, use the table below to determine the likely cause and then correct it.
9. Stop the engine and check the change in fuel pressure: it should not drop.
If the pressure decreases, note the degree of decrease.
Determine and eliminate the causes by referring to the following table.
10. Reduce the fuel pressure in the fuel line.
11. Disconnect the high pressure hose and remove the pressure gauge.
Warning. Cover the pipe connection with rags to prevent fuel from escaping.
12. Install a new O-ring at the end of the high pressure line.
13. Connect the high pressure hose to the distribution line, tightening to the torque shown below.
- Tightening torque - 3-4 Nm.
14. Check for fuel leaks
- Apply voltage to the fuel pump drive terminal.
- Check for fuel leaks under pressure while the fuel pump is running.