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Inspecting the injection rate, tightness and jet formation of the injectors > < Test fuel pressure regulator and holding pressure

Octavia Mk1

Testing injection valves
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 → Chapter.
–  Disconnect plug at the injection valve to be tested.
   
–  Perform resistance measurement between the contacts of the valve with multimeter.
Specified value: approx. 14.5 Ω.
If the engine is warm the resistance increases by approximately 4 to 6 Ω.
–  If the nominal value is not reached, replace the injection valve.
B - Checking voltage supply
Test conditions
l  Fuel pump relay o.k., test → Chapter
l  Fuse for injection valves O.K. → Current flow diagrams and Fitting locations
–  Disconnect plug at the injection valve to be tested.
  S24-0209
–  Connect the voltage tester between contact 1 of the plug and the engine mass.
  Note
So that the engine does not start, disconnect the plug at the ignition module.
–  Operate starter for some seconds, the voltage tester must light up.
–  If the voltage tester does not light up, check the continuity of the wiring from contact 1 to fuse for injection valves and if necessary eliminate open circuit → Current flow diagrams and Fitting locations.
–  If the voltage tester lights up, test actuation of the injection valves.
C - Test actuation of the injector valves
–  Disconnect plug at the injection valve to be tested.
  S24-0219
–  Connect voltage tester between contact 2 of the plug and battery positive (+).
–  Activate the starter.
Specified value: Voltage tester must flash.
  Note
Voltage tester with low voltage consumption do not go out fully between the actuations of the engine control unit, but keep on glowing and become brighter during the actuation.
If the voltage tester does not flash
–  Connect test box-V.A.G 1598/22 - to the wiring loom on the engine control unit → Chapter.
–  Test wiring between contact 2 of the plug from the relevant injection valve and engine control unit for interruption or short circuit to positive.
  S24-0210
Contact 2
at plug of injection valves		Test box -V.A.G 1598/22-
173
280
358
465

–  If necessary eliminate wire interruption or short-circuit.
–  If the wiring is O.K., replace engine control unit → Chapter.
   

Inspecting the injection rate, tightness and jet formation of the injectors > < Test fuel pressure regulator and holding pressure