Checking the idle speed
Verification conditions
- Engine coolant temperature should be 80-95°C
- Lights, electric cooling fan and all accessories off
- gear lever (or selector) is in neutral («R» or «N» for vehicles with A/T)
- The steering wheel is in the straight ahead position (amplifier control).
1. Install a tachometer or connect a scan tool to the data acquisition line in the fuse box.
2. Ground the ignition timing terminal.
3. Start the engine, let it idle.
4. Check up installation of an advancing of ignition, if necessary adjust it.
- Ignition advance setting - 5°± 2°before TDC (at idle)
5. Disconnect the ground wire.
6. Wait 2 minutes for the engine to idle.
7. Check up number of turns of idling.
- Idle speed - 750±100 rpm.
Note. Idle speed adjustment is not normally required as the system controls the idle speed.
8. If the idle speed is out of range, adjust them with the adjustment screw (BP) to the standard value.
Note. If the engine stalls, the cause may be sediment on the surface of the throttle.
9. Turn the ignition switch to position «Turned off» («OFF»).
10. If a scan tool was not used, disconnect the data line connector.
Cleaning the Throttle Surface from Sludge
1. Warm up the engine and then turn it off.
2. Remove the air inlet hose from the throttle body.
3. Plug the bypass inlet in the damper body.
4. Spray the cleaning solvent onto the throttle body through the intake port in the throttle body and allow to hold for approximately 5 minutes.
5. Start the engine and allow the engine to idle, increasing its speed several times.
6. Repeat the procedures in steps 4 and 5.
7. Remove the plug in the bypass.
8. Connect the air inlet hose.
9. Disconnect the wire connecting the battery to «weight», for more than 10 seconds.
10. Adjust idle speed (adjustment screw).
Fuel pump check
1. Turn the ignition switch to position «Turned off» («OFF»).
2. Apply battery voltage to the fuel pump drive to check if the pump is running.
Note. The fuel pump is located in the tank and therefore the noise from its operation is difficult to hear if the fuel filler cap is not removed.
3. Pinch the hose with your fingers in order to feel the presence of fuel pressure.
Fuel pressure check
1. Reduce the pressure in the fuel supply line and hoses as follows.
- Disconnect the fuel pump harness.
- Start the engine, and after it stops by itself, turn the ignition switch to the «Turned off» («OFF»)
- Disconnect the negative battery terminal
- Connect the fuel pump harness.
2. Disconnect the high pressure hose from the fuel supply side.
Warning. Close pipe connections to prevent fuel splashing caused by residual pressure in the fuel supply line.
3. Using an adapter, install a fuel pressure gauge, connect it to the high pressure hose.
4. Attach the negative (—) battery output.
5. Apply battery voltage to the fuel pump drive and turn off the pump. After fuel pressure is built up, check for leaks from the instrument.
6. Disconnect the vacuum hose from the pressure regulator and plug the end of the hose. Measure fuel pressure at idle.
- Standard value - 320-340 kPa
7. Measure the fuel pressure while the vacuum hose is attached to the pressure regulator.
- Standard value is approximately 270 kPa
8. If the measurement results do not match the standard value, take corrective action using the following table.
9. Turn off the engine and check if there is a change in the readings of the fuel pressure gauge, which should be held for approximately 5 minutes. If the meter reading drops, note the degree of reduction. Determine and correct the cause of this according to the table below.
10. Reduce the fuel pressure in the fuel supply line.
11. Disconnect the high pressure hose and fuel pressure gauge.
Warning. Cover the connection with a rag to prevent fuel splashing.
12. Connect the high pressure fuel hose to the distribution line, applying the required tightening torque.
- Tightening torque - 3-4 Nm
13. Check for fuel leaks
- Apply battery voltage to the fuel pump drive.
- If there is pressure in the pipeline, check for leaks in the fuel supply pipeline.