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Test injection valves - valid 08.97 ? > < Inspecting the injection rate, tightness and jet formation of the injectors

Octavia Mk1

Test injection valves - valid ? 07.97
Test injection valves - valid ? 07.97
Special tools and workshop equipment required
t  Test box -V.A.G 1598/22-
t  Hand-held multimeter e.g. -V.A.G 1526 A- or multimeter -V.A.G 1715-
t  Voltage tester, e.g. - V.A.G 1527-
t  Measuring tool set -V.A.G 1594 A-
t  Current flow diagram
Test conditions
l  Engine speed sender o.k.
l  Fuel pump relay OK
Test sequence
–  Remove ignition cable guides.
A - Electrically test the injection valves
–  Disconnect plug at the injection valve to be tested.
   
–  Perform resistance measurement between the contacts of the valve with -V.A.G 1526 A-.
Specified value: 13 to 18 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 condition
l  Fuse 32 for injection valves O.K.
–  Disconnect plug at the injection valve to be tested.
  S24-0180
–  Connect the voltage tester -V.A.G 1527- between contact 1 of the plug and the engine mass.
–  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, if necessary eliminate open circuit → Current Flow Diagrams, Electrical Fault Finding, 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.
  S24-0151
–  Connect the voltage tester -V.A.G 1527- between contact 2 and positive (+) of the battery.
–  Operate starter for some seconds (while doing so, the engine can also start).
Specified value: Voltage tester must flash.
  Note
Voltage tester with low voltage consumption do not go out fully between the flash pulses, but keep on glowing and become brighter during the flash pulse.
If voltage tester does not flash:
  S24-0150
–  Connect test box -V.A.G 1598/22 - at wiring loom to the engine control unit.
  WARNING
To avoid damaging the electronic components, switch on the relevant measuring range before connecting the measuring cables and comply with the test conditions.
–  Test wiring between contact 2 of the plug from the relevant injectionn valve and engine control unit for continuity or short circuit to positive.
  S24-0148
Contact 2 at plug of injection valveTest box -V.A.G 1598/22- or -J220-
173
280
358
465

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

Test injection valves - valid 08.97 ? > < Inspecting the injection rate, tightness and jet formation of the injectors