Testing Injection Valves - Skoda OCTAVIA MK1 Service Manual

Open shut-off cock at the pressure
–
measuring device -V.A.G 1318- (lever in
direction of flow of fuel).
– Start engine and run in idle.
After the pressure has been built up,
– switch ignition off. At the same time the
return-flow hose (with blue marking)
must be pressed together.
If the pressure does not drop:
– Replace the fuel pressure regulator.
If the pressure again drops:
Check line connections, "O" -rings on fuel
–
rail and injectors for leaks.
Inspect pressure measuring device for
–
leaks.
Note
Before removing the pressure gauge
appliance, reduce the fuel by opening the
shutoff cock and place a cleaning cloth
around the connection point.

Testing injection valves

Special tools and workshop equipment required
t Handheld multimeter, e.g. -V.A.G 1526 A -
t Voltage tester, e.g. - V.A.G 1527-
t Measuring tool set -V.A.G 1594 A -
t Test box -V.A.G 1598/22-
t Current flow diagram
A - Testing resistances of the injection valves
– Remove fuel distributor
– Disconnect plug at the injection valve to be tested.
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