Pic. 2-210. Checking the fuel pressure in the system:
1, 2 - position of the pressure gauge valve;
3 - fuel line of the starting injector;
4 - metering fitting of the fuel dispenser-distributor.
Control pressure test
Disconnect the electro-hydraulic control pressure regulator connector at the fuel dispenser. Close the pressure gauge valve (pic. 2-210. position 1) Turn on the fuel pump with the jumper switch and wait until the pressure on the pressure gauge is set within 5.7-6.2 kgf / cm2. If the pressure is outside the specified limits, disconnect the smaller diameter hose from the pressure regulator and lower its end into a beaker. Turn on the fuel pump for 1 minute and determine the amount of leaked fuel, which should be within 130-150 cm3. Connect the hose to the pressure regulator. Turn on the fuel pump. In this case, the pressure on the pressure gauge should be set within 1.3-1.6 kgf / cm2. If the pressure is out of range, replace the electro-hydraulic control pressure regulator.
Residual pressure test
Open the pressure gauge valve (pic. 2-210. position 2). Turn on the fuel pump with the jumper switch of the relay block for 5 s. After 10 minutes, check the residual pressure, which should be at least 3.3 kgf / cm2, after 20 minutes - 3.2 kgf / cm2. The sequence of checks when determining malfunctions of the fuel injection control subsystem of the KSUD «KE-Motronic» shown in Table 2-31.
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