1997 SKODA OCTAVIA fuel

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Edition 08.96




Testing fuel pump
Special tools, testers and aids required
Hand-held multimeter (e.g. V.A.G 1526)
Wrench for union nut (e.g. MP 1-227)
Adapter cable set (e.g. V.A.G 1594)
Current flow diagram
Test conditions
Holding pressure o.k.; testing:
1.8 ltr./92 kW Engine, Motronic Fuel Injection and Ignition System; Repair Group 24;
Testing fuel pressure regulator and holding pressure
Battery voltage at least 12 V
Fuse 28 o.k.
Fuse filter o.k.
Test procedure
- Switch on ignition. The fuel pump should be heard to operate. (A second mechanic may be required if there is a high level of surrounding noise) If the fuel pump does not run:
- Switch off ignition.
- Connect remote control V.A.G 1348/3A with adapter cable V.A.G 1348/3-2 page 20-8.
- Operate remote control.If the fuel pump runs:
Test fuel pump relay: 1.8 ltr./92 kW Engine, Motronic Fuel Injection and Ignition System; Repair Group 24; Servicing Motronic fuel injection system; testing fuel pump relay and actuation

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20Fuel Supply System




Edition 08.96

If the fuel pump does not run:
- Unbolt cover (below the rear seat).
- Release 4-pin connector form the flange at
the fuel tank and unplug.
- Connect hand-held multimeter (e.g. V.A.G
1526) with auxiliary cables (e.g. from V.A.G
1594) to the outer contacts of the connector.
- Operate remote control. Specification: about battery voltage
If the specification is not achieved:
- Determine open circuit in the wiring on the basis of the current flow diagram and rectify:
⇒ Current Flow Diagrams, Electrical Fault Finding and Fitting Locations binder
If the specification is achieved:
- Use MP 1-227 to unscrew union nut.
- Check whether the electric cables between flange and fuel pump are connected and test
for continuity.
If no open circuit in the wiring can be found:
Fuel pump faulty.
- Replace fuel delivery unit ⇒ page 20-5.
Testing delivery of the fuel pump
Special tools, testers and aids required♦ Adapter V.A.G 1318/17
♦ Measuring vessel
Test conditions
Battery voltage at least 12 V
Voltage supply o.k.
Fuel filter o.k.

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Test procedure
- Switch off ignition.
- Connect remote control V.A.G 1348/3A with
adapter cable V.A.G 1348/3-2 ⇒ page 20-8.
- Remove cap from the fuel filler neck.
Important! Fuel system is pressurised! Place cleaning ragsaround the connection point before opening the
system. Then, release pressure by carefullyloosening the connection point.
- Disconnect fuel return flow pipe -2- (press
release buttons).
- Connect auxiliary hose to adapter V.A.G 1318/17 and fit onto the fuel return flow pipe of the engine and hold in a measuring vessel.
- Operate remote control for 15 seconds (press button and hold).
- Compare quantity of fuel supplied with spe-
cification.
*)Minimum delivery cm3/15 s
**)Voltage at fuel pump when engine switched
off and pump running (about 2 V less than battery voltage).

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20Fuel Supply System




Edition 08.96

1 - Solenoid valve 1 (N80)
Testing operation and actuation:
1.8 ltr./92 kW Engine, Motronic Fuel Injection and Ignition System; Repair Group 24;
Testing tank breather; Testing solenoid valve 1 for activated charcoal filter
2 - Connector
3 - Vent pipe From gravity valve at fuel tank page
20-2, item 4
To disconnect, press release buttons on connector
4 - Throttle valve control unit
5 - Activated charcoal filter with solenoid valve 1 (N80)
Installation point: in right of engine compartment
To remove, take off PAS reservoir andpush to the side
6 - Spring nut
Removing and installing parts of the activated charcoal filter system Servicing throttle mechanism
1 - Throttle cable Adjust by re-positioning locking ele- ment on detent page 20-13
2 - Locking element
3 - Accelerator pedal
4 - Spacer bush
5 - Bearing bush
6 - Washer
7 - Stop screw
8 - 20 Nm

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Adjusting throttle cable
Notes:
The throttle cable is very sensitive to kinking
and should be treated with particular care
when installing.
A single slight kink can subsequently resultin the cable fracturing when driving. Throttle
cables which have been kinked, musttherefore not be installed.
When installing, ensure that the throttle cableis properly aligned between its supporting
points and the cable attachment points.
Special tools, testers and aids required Spring stretcher rod
Procedure
- Attach throttle cable to the accelerator pedal and to the cam of the throttle valve control unit.
- Pull off locking element for throttle cable at the detent.
- Depress accelerator pedal to full throttle position.
Note:
A second mechanic is required for this step ordepress accelerator pedal using spring stretcher
rod supported against steering wheel.
Models with manual gearbox
- Adjust throttle cable by repositioning the detent on the support bracket so that full throttle position is reached at the throttle
valve lever.
Models with automatic gearbox
- Adjust throttle cable by repositioning the detent on the support bracket so that the throttle valve has opened fully and the kickdown switch is heard to click.
For all models
- Release accelerator pedal or remove stretcher rod.
- After completing adjustment, check idling speed and full throttle stop of the throttle valve.