9-3 Viggen Coupe (9400) L4-2.3L Turbo (B235) HO (1999)
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It may be necessary to restart the pump during the check as the activation period using the diagnostic tool is 30 s.
6
Check the value at atmospheric pressure. The value should be 3 bar (43 psi).
7
Increase the vacuum in the pressure regulator with the pressure/vacuum pump. The system pressure should drop with the same amount as shown
on the pressure gauge.
System pressure: 3.0 bar (43 psi)
8
Pump up pressure in the fuel pressure regulator with the vacuum pump. The system pressure should now increase with the same amount as shown
on the pressure gauge.
9 Safety on" the adapter and remove the pressure gauge equipment from the fuel rail service nipple. Screw on the valve cap.
10
Remove the pressure/vacuum pump from the fuel pressure regulator and connect the vacuum hose.
