Skoda Octavia Workshop Manual
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Skoda Octavia Workshop Manual

1.6-ltr./55 kw engine, 1 avm fuel injection and ignition system
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Service
Workshop Manual
OCTAVIA
1.6-ltr./55 kW Engine, 1 AVM
Fuel Injection and Ignition System
Service Department. Technical Information
S00.5109.51.20 Edition 11.98

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  • Page 1 Service Workshop Manual OCTAVIA 1.6-ltr./55 kW Engine, 1 AVM Fuel Injection and Ignition System Service Department. Technical Information S00.5109.51.20 Edition 11.98...
  • Page 2 The Service Manual is intended only for use within the Škoda Organisation; Printed in CR it is not permitted to pass it onto third persons. © 1998 ŠKODA AUTO a. s.
  • Page 3 Service List of Supplements to OCTAVIA Workshop Manual Edition: 11.98 1.6-ltr./55 kW Engine, 1 AVM Fuel Injection and Ignition System Replaces List of Supplements - Edition: 08.96 Subject Edition Article Number Supple- ment 08.96 Basic Edition of Workshop Manual S00.5109.50.20 11.98...

  • Page 5: Table Of Contents

    OCTAVIA Service Contents Self-diagnosis Page Self-diagnosis ..........................01-1 Features of self-diagnosis ......................01-1 Technical data of self-diagnosis ....................01-1 Connecting vehicle system tester V.A.G 1552 and selecting engine electronics control unit .. 01-2 Interrogating and erasing fault memory ..................01-4 Fault table ..........................

  • Page 7: Self-Diagnosis

    OCTAVIA Self-Diagnosis Self-diagnosis Note: The self-diagnosis monitors only a part of the fuel injection and ignition system. Always use Binder 2 for fault finding. Features of self-diagnosis The engine control unit -J382- is equipped with a fault memory. The fault memory is designed as a permanent memory.

  • Page 8: Connecting Vehicle System Tester V.a.g 1552 And Selecting Engine Electronics Control Unit

    OCTAVIA Self-Diagnosis Function Requirement Engine Engine idling running, ignition on 02 Interrogate fault memory 03 Final control diagnosis 3)4) 04 Basic setting 05 Erase fault memory 06 End output 08 Read measured value block Only if engine does not start (starter must operate for at least 6 seconds).
  • Page 9 OCTAVIA Self-Diagnosis After the vehicle system tester has been connected: Depending on the desired function, you must: switch on ignition or start the engine ⇒ page 01-1, table of „Available Functions“. Notes: ♦ If the readouts which appear in the display are not the same as shown in the procedure: ⇒...

  • Page 10: Interrogating And Erasing Fault Memory

    OCTAVIA Self-Diagnosis Interrogating and erasing fault memory Special tools, testers and aids required ♦ Vehicle system tester V.A.G 1552 with cable V.A.G 1551/3 Procedure Connect the vehicle system tester V.A.G 1552 and select the engine electronics cont- rol unit with the „address word“ 01. The engine should be idling when carrying out this step.
  • Page 11 OCTAVIA Self-Diagnosis Test of vehicle systems K Readout on display: → Fault memory is erased! Press the → key. Press the keys 0 and 6 for the function „end data transfer“ and confirm the entry with the key Q. Rectify the faults displayed by referring to the fault table ⇒...
  • Page 12 OCTAVIA Self-Diagnosis Notes: ♦ If components are displayed as faulty: ♦ The fault table is arranged in accordance with the 5-digit First of all test the wiring and plug connections to these fault code indicated on the left. components and also the earth cables of the system on the basis of the current flow diagram.
  • Page 13 OCTAVIA Self-Diagnosis 1552 Possible cause of fault Possible effects ♦ ♦ ♦ ♦ ⇒ ♦ ♦ ⇒ ♦ ♦ ♦ 00519 ♦ ♦ ♦ ⇒ ♦ ♦ ♦ ♦ ♦ ♦ 00522 ♦ ♦ ♦ ⇒ ♦ ♦ ♦ ♦...
  • Page 14 OCTAVIA Self-Diagnosis of f ♦ ♦ ♦ ⇒ ♦ ♦ ♦ ♦ ♦ 15 ∠ ⇒ ♦ ♦ ♦ 00525 ♦ ♦ ♦ ⇒ ♦ ♦ ♦ 00529 ♦ ♦ ⇒ ♦ ♦ ♦ ------------ ------------ Edition S00.5109.50.20...
  • Page 15 OCTAVIA Self-Diagnosis Readout on V.A.G 1552 Possible cause of fault Possible effects Rectifying faults 00530 Throttle valve positioner/ potentiometer -G88 Open/short circuit to ♦ Open circuit in wiring or ♦ Cold start problems - Test G88 positive short circuit to positive ♦...

  • Page 16: Final Control Diagnosis

    OCTAVIA Self-Diagnosis Readout on V.A.G 1552 Possible cause of fault Possible effects Rectifying faults 00537 ♦ Fuel pump faulty ♦ No lambda control - Test fuel pump Lambda control ⇒ Engine, Mechanical ♦ Poor drivability Components; Repair Control limit exceeded Group 20 ♦...
  • Page 17 OCTAVIA Self-Diagnosis Readout on V.A.G 1552 Possible cause of fault Possible effects Rectifying faults 00609 Ignition output 1 Short circuit to positive ♦ Cable to ignition trans- ♦ Engine does not start - Test output stage of ignition former has short circuit to transformer ⇒...
  • Page 18 OCTAVIA Self-Diagnosis Readout on V.A.G 1552 Possible cause of fault Possible effects Rectifying faults 01249 Injector cylinder 1 -N30 Short circuit to positive ♦ N30 faulty ♦ Increased emission levels - Test N30...N33 ♦ Cable has short circuit to ♦ Poor starting characteristics ⇒...
  • Page 19 OCTAVIA Self-Diagnosis 01252 ⇒ 01259 ♦ ♦ ⇒ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ⇒ ♦ ⇒ ♦ ♦ ♦ ⇒ Edition 08.96 ------------ 01-11 ------------ S00.5109.50.20...
  • Page 20 OCTAVIA Self-Diagnosis diagnosis and aids 1552 ♦ ♦ ♦ ♦ ♦ ♦ S10, Notes: To repeat final control diagnosis without starting the engine in between, switch off ignition for about 20 seconds. ------------ ------------ Edition 08.96 S00.5109.50.20...
  • Page 21 OCTAVIA Self-Diagnosis Procedure Connect vehicle system tester V.A.G 1552 and select the engine electronics control unit with „address word“ 01. The ignition must be switched on for this step. (Connecting vehicle system tester and selecting engine electronics control unit ⇒ page 01-2.)
  • Page 22 OCTAVIA Self-Diagnosis If the valve does not click: Continue test ⇒ page 24-49. Display engine speed signal: Disconnect auxiliary cables from adapter cable set V.A.G 1594 A and install fuel pump relay -1-. Press the key. Final control diagnosis K Readout in display: Signal for engine speed The rev counter must indicate approx.
  • Page 23 OCTAVIA Self-Diagnosis Press the → key. Test of vehicle systems HELP K Readout in display: Select function XX Press keys 0 and 6 for the function ”End data transfer” and confirm the entry with the key Q. Switch off the ignition.

  • Page 24: Lists Of Display Groups

    OCTAVIA Self-Diagnosis Read measured value block and basic setting The measured values in the functions Read measured value block and Basic setting are described in the individual component tests. The list below is intended only as an overview. Note: Proceed as follows in order to switch to another...
  • Page 25 OCTAVIA Self-Diagnosis Test table display group 000 Display Readout on V.A.G Possible cause of fault Rectifying fault block 1552 less than 35 ♦ Open circuit in wiring or short circuit to - Test cable to sender for open circuit and...
  • Page 26 OCTAVIA Self-Diagnosis Display Readout on V.A.G Possible cause of fault Rectifying fault block 1552 readout does not ♦ Large quantity of unmetered air - Eliminate cause of unmetered air vary ♦ Spark plug faulty - Inspect spark plugs ♦ Fuel system pressure too low or too high - Test fuel pressure regulator and holding pressure ⇒...
  • Page 27 OCTAVIA Self-Diagnosis Display Readout on V.A.G Possible cause of fault Rectifying fault block 1552 less than 5 ♦ High quantity of fuel out of ACF system - Test activated charcoal filter solenoid valve ⇒ page 24-49 ♦ Incorrect injectors with excessively large - Test quantity injected ⇒...
  • Page 28 OCTAVIA Self-Diagnosis Display group 001 Read measured value block K Readout in display → 760...860 80...110 0...1.0 00000000 °C Display blocks Engine operating state Lambda voltage Coolant temperature Idling speed Test table - display group 001 Display Readout on V.A.G...
  • Page 29 OCTAVIA Self-Diagnosis Display Readout on V.A.G Possible cause of fault Rectifying fault block 1552 constant between ♦ Open circuit in wiring caused by: - Test lambda probe ⇒ page 24-12 0.40 and 0.50 V Lambda probe or Signal wire or Engine control unit constant 0.00 V...
  • Page 30 OCTAVIA Self-Diagnosis Continuation of test table - Display group 001 Display Readout on V.A.G 1552 Meaning of digits in 8-digit numerical block block Meaning if display positions = 1 Fault stored in fault memory Ignore AC compressor switched on Idling switch open...
  • Page 31 OCTAVIA Self-Diagnosis Display group 003 Read measured value block K Readout in display → 760...860 17...34 % 4...10 ° 22...41 % Display blocks Throttle valve positioner analysis Throttle valve angle Engine load Idling speed Test table - display group 003 Display Readout on V.A.G...
  • Page 32 OCTAVIA Self-Diagnosis Display Readout on V.A.G Possible cause of fault Rectifying fault block 1552 less than 4 ∠° ♦ Throttle valve potentiometer in throttle - Test throttle valve control unit valve control unit faulty or incorrectly set ⇒ page 24-17 ♦...
  • Page 33 OCTAVIA Self-Diagnosis Display group 004 Read measured value block K Readout in display → 760...860 17...34 % 01000000 Display blocks Engine operating state Ignore Engine load Idling speed Test table - display group 004 Display Readout on V.A.G Possible cause of fault...
  • Page 34 OCTAVIA Self-Diagnosis Display group 005 Read measured value block K Readout in display → 760...860 6...19 % Display blocks Not assigned Ignore On/off ratio (actuation) of activated charcoal filter solenoid valve Idling speed Test table - display group 005 Display Readout on V.A.G...

  • Page 35: Servicing Fuel Injection System

    OCTAVIA Fuel Preparation/Fuel Injection Servicing fuel injection system Summary of fitting locations 1 - Lambda probe (G39), 55 Nm 3 - Solenoid valve 1 for activated charcoal ♦ Installation point: in front exhaust pipe filter (N80) ♦ Activated charcoal filter system 2 - 4-pin connector ⇒...
  • Page 36 OCTAVIA Fuel Preparation/Fuel Injection 5 - Engine control unit (J382) 10 - Earth connection 6 - Throttle valve control unit (J338) 11 - Fuel pressure regulator 7 - Knock sensor 1 (G61) 12 - Distributor ♦ ⇒ page 28-1 ♦ ⇒ page 28-1...
  • Page 37 OCTAVIA Fuel Preparation/Fuel Injection 15 - Injector (N30...N33) 18 - Oil pressure switch 16 - Air filter 19 - Activated charcoal filter ♦ Removing ⇒ page 24-8, Fig. 3 ♦ Activated charcoal filter system ⇒ Engine, Mechanical Components; Repair 17 - Spark plug, 25 Nm Group 20;...
  • Page 38 OCTAVIA Fuel Preparation/Fuel Injection 1 - Warm air intake 5 - Connector ♦ To warm air baffle ♦ 8-pin ♦ For throttle valve control unit (J338) 2 - To oil separator 6 - Cable guide 3 - Air filter ♦ Clipped onto fuel rail ♦...
  • Page 39 OCTAVIA Fuel Preparation/Fuel Injection 9 - Connection for return-flow hose 21 - Connector 10 - Connection for feed hose 22 - Retaining clip 11 - To brake servo unit 23 - Lambda probe (G39)*, 55 Nm ♦ Installation point: in front exhaust pipe 12 - Vacuum hose ♦...

  • Page 40: Disassembling And Assembling Intake Manifold

    OCTAVIA Fuel Preparation/Fuel Injection Disassembling and assembling fuel rail together with injectors 1 - Fuel rail 2 - Retaining clip ♦ Ensure it is correctly fitted onto injector and fuel rail. 3 - Retaining clip 4 - Fuel pressure regulator ♦...

  • Page 41: Disassembling And Assembling Air Filter

    OCTAVIA Fuel Preparation/Fuel Injection 6 - 10 Nm 10 - to solenoid valve 1 for activated char- coal filter (N80) 7 - Earth cable ♦ Activated charcoal filter system ♦ for throttle valve control unit ⇒ Engine, Mechanical Components; repair group 20;...
  • Page 42 OCTAVIA Fuel Preparation/Fuel Injection K Fig. 1 Resistances for coolant tempera- ture sender (G62) The range A tells you the resistances for the temperature range 0...50 °C; range B the re- sistances for the temperature range 50...100 °C. How to read the chart: ♦...
  • Page 43 OCTAVIA Fuel Preparation/Fuel Injection Important! Fuel system is pressurised! Place cleaning rags around the connection point before opening the system. Then, release the pressure by carefully detaching the connection point. ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ Edition 08.96 ------------ 24-9 ------------ S00.5109.50.20...

  • Page 44: Technical Data

    OCTAVIA Fuel Preparation/Fuel Injection Technical data Engine code letter Idling speed 760 - 860 Engine control unit Control unit version 1AVM Part No. ⇒ Parts List Fuel pressure at idling speed Vacuum hose fitted on approx. 0.25 Fuel pressure at idling speed Vacuum hose detached approx.
  • Page 45 OCTAVIA Fuel Preparation/Fuel Injection Press keys 0 and 4 for the function „Initiate basic setting“ and confirm the entry with the key Q. Basic setting HELP K Readout in display: Enter display group number XXX Press the keys 001 for „Display group number 001“...

  • Page 46: Testing Lambda Probe And Lambda Control

    OCTAVIA Fuel Preparation/Fuel Injection Testing lambda probe and lambda control The lambda probe compares alternately the concentration of the oxygen in the air with the residual oxygen in the exhaust and supplies the voltage signal to the control unit. The voltage signal „rich mixture (low level of residual oxygen)“...
  • Page 47 OCTAVIA Fuel Preparation/Fuel Injection ♦ The probe has been damaged by contact spray or a similar product (contact spray has got into the probe along the cables as a result of temperature changes and the capillary effect of the holes).
  • Page 48 OCTAVIA Fuel Preparation/Fuel Injection Read measured value block 1 K Readout in display, e.g.: 780 rpm 85 °C 0,75 V 00000000 Do not continue with the test until l coolant temperature is more than 80 °C -display block 2- l engine has run for a further 2 minutes at idling...

  • Page 49: Testing Lambda Probe Heater

    OCTAVIA Fuel Preparation/Fuel Injection Testing lambda probe heater Special tools, testers and aids required ♦ Test box V.A.G 1598/22 ♦ Hand-held multimeter, e.g. V.A.G 1526 A or multimeter V.A.G 1715 ♦ Adapter cable set V.A.G 1594 A ♦ Diode test lamp, e.g. V.A.G 1527 ♦...

  • Page 50: Testing Lambda Probe Signal Wire And Actuation

    OCTAVIA Fuel Preparation/Fuel Injection If the specification is not achieved, connect the multimeter between contact 1 of the connector at the wiring loom and earth. Start engine. Specification: approx. battery voltage If the specification is not achieved: Test cable from contact 1 to fuse for open circuit or short circuit to earth.
  • Page 51 OCTAVIA Fuel Preparation/Fuel Injection Switch off ignition. If the specification is achieved: Replace lambda probe. If the specification is not achieved: Connect test box V.A.G 1598/22 to the wiring loom to the engine control unit. Test the following cable connections for open...

  • Page 52: Testing Operating States Of Engine

    OCTAVIA Fuel Preparation/Fuel Injection Testing engine operating states Note: What is tested is whether the engine control unit (J382) detects the operating states of the engine (idling, part load, full load, overrun). Special tools, testers and aids required ♦ Vehicle system tester V.A.G 1552 with cable V.A.G 1551/3...
  • Page 53 OCTAVIA Fuel Preparation/Fuel Injection ♦ Part throttle: Depress the throttle evenly. 3rd place from the left should indicate 1 Readout: 001000000 ♦ Full throttle: Briefly depress to full throttle (blip throttle) 4th place from the left should briefly indicate Readout: 00010000 ♦...

  • Page 54: Testing Throttle Valve Control Unit

    OCTAVIA Fuel Preparation/Fuel Injection Testing throttle valve control unit Note: If the throttle valve control unit (J338) is removed and installed or replaced, it is then necessary to carry out a basic setting ⇒ page 24-10. Special tools, testers and aids required ♦...
  • Page 55 OCTAVIA Fuel Preparation/Fuel Injection 00000000 00010000 ⇒ Cause Continue test ⇒ ⇒ Continuation of test if readout always indica- tes 1 -2-. ⇒ Edition 08.96 ------------ 24-19 ------------ S00.5109.50.20...
  • Page 56 OCTAVIA Fuel Preparation/Fuel Injection ⇒ ⇒ test -2-. ⇒ ⇒ ⇒ ------------ ------------ S00.5109.50.20...
  • Page 57 OCTAVIA Fuel Preparation/Fuel Injection and po- condition 1552 ⇒ ⇒ Edition 08.96 ------------ 24-21 ------------ S00.5109.50.20...
  • Page 58 OCTAVIA Fuel Preparation/Fuel Injection -2-..200 Ω ⇒ ⇒ 1552 ⇒ → ------------ 24-22 ------------ S00.5109.50.20...
  • Page 59 OCTAVIA Fuel Preparation/Fuel Injection → ⇒ ⇒ Cause Continue test ⇒ ⇒ Continuation of test if readout 0 -2-. → Edition 08.96 ------------ ------------ S00.5109.50.20...
  • Page 60 OCTAVIA Fuel Preparation/Fuel Injection ⇒ → ⇒ ⇒ test than -2-. → ⇒ → ⇒ ------------ 24-24 ------------ S00.5109.50.20...
  • Page 61 OCTAVIA Fuel Preparation/Fuel Injection ⇒ control unit ⇒ -2-. .5 . Edition 08.96 ------------ ------------ S00.5109.50.20...
  • Page 62 OCTAVIA Fuel Preparation/Fuel Injection ⇒ Special 1552 ♦ ♦ ♦ ♦ ♦ 1552 ⇒ → ------------ ------------ S00.5109.50.20...
  • Page 63 OCTAVIA Fuel Preparation/Fuel Injection Cause Continue test ⇒ ⇒ Continuation of test ⇒ Edition 08.96 ------------ ------------ S00.5109.50.20...
  • Page 64 OCTAVIA Fuel Preparation/Fuel Injection ∞ Ω ⇒ → ⇒ → ∞ Ω ⇒ ------------ ------------ S00.5109.50.20...
  • Page 65 OCTAVIA Fuel Preparation/Fuel Injection 1552 ♦ ♦ ♦ ♦ ♦ condition ⇒ Note: The vehicle has to be driven in order to test the vehicle speed signal. A second person is re- quired for this test. 1552 ⇒ Edition 08.96 ------------ 24-29 ------------ S00.5109.50.20...
  • Page 66 OCTAVIA Fuel Preparation/Fuel Injection → ⇒ ------------ ------------ Edition S00.5109.50.20...
  • Page 67 OCTAVIA Fuel Preparation/Fuel Injection Testing coolant temperature sender Special tools, testers and aids required Vehicle system tester V.A.G 1552 with cable V.A.G 1551/3 Test box V.A.G 1598/22 Hand-held multimeter, e.g. V.A.G 1526 A or multimeter V.A.G 1715 Adapter cable set V.A.G 1594 A...
  • Page 68 OCTAVIA Fuel Preparation/Fuel Injection Read off the coolant temperature shown in display block 2. Readout Cause Continue test -40 °C Open circuit or short ⇒ page 24-32 circuit to positive 128 °C Short circuit to earth ⇒ page 24-33 approx. coolant...
  • Page 69 OCTAVIA Fuel Preparation/Fuel Injection Ω Ω → → Edition 08.96 ------------ ------------ S00.5109.50.20...
  • Page 70 OCTAVIA Fuel Preparation/Fuel Injection ∞ Ω ⇒ i coolant Notes: If the → 1552 ------------ ------------ S00.5109.50.20...
  • Page 71 OCTAVIA Fuel Preparation/Fuel Injection ♦ Adapter cable set V.A.G 1594 A ♦ Current flow diagram ♦ Refrigeration spray (commercially available) Note: Resistances for intake air temperature sender -G42- ⇒ page 24-8. Test procedure Connect vehicle system tester V.A.G 1552 and select engine electronics control unit with the address word 01.
  • Page 72 OCTAVIA Fuel Preparation/Fuel Injection Continuation of test if readout -40 °C: Unplug the connector -1- from the intake air temperature sender (G42) with the intake manifold pressure sender (G71) -2-. Bridge the contacts 1 + 2 of the connector using auxiliary cables from V.A.G 1594 A and at the same time check the readout in the display.
  • Page 73 OCTAVIA Fuel Preparation/Fuel Injection Replace the engine control unit (J382) ⇒ page 24-5, item 28. Continuation of test if readout 129 °C: Unplug the connector -1- from the intake air temperature sender (G42) with intake ma- nifold pressure sender (G71) -2-.

  • Page 74: Testing Voltage Supply For Control Unit

    OCTAVIA Fuel Preparation/Fuel Injection Continuation of test if readout is ambient temperature: Remove the intake air temperature sender with intake manifold pressure sender (the connector remains plugged in). Note the intake air temperature shown in display block 4. Spray the sender with a commercially available refrigeration spray and observe the temperature readout.
  • Page 75 OCTAVIA Fuel Preparation/Fuel Injection Test of vehicle systems HELP K Readout in display: Select function XX Press keys 0 and 8 for the function „Read measured value block“ and confirm the entry with the key Q. Read measured value block...

  • Page 76: Adapting Engine Electronics Control Unit To Electronic Immobiliser

    OCTAVIA Fuel Preparation/Fuel Injection Adapting engine electronics control unit to the electronic immobiliser Special tools, testers and aids required ♦ Vehicle system tester V.A.G 1552 with cable V.A.G 1551/3 Test condition l Authorized car key available Procedure Connect vehicle system tester V.A.G 1552.
  • Page 77 OCTAVIA Fuel Preparation/Fuel Injection → → Note: When the ignition is next switched on, the identi- fication of the engine control unit is entered in the immobiliser control unit. actuation Edition 08.96 ------------ 24-41 ------------ S00.5109.50.20...
  • Page 78 OCTAVIA Fuel Preparation/Fuel Injection Ω Ω Ω ------------ 24-42 ------------ S00.5109.50.20...
  • Page 79 OCTAVIA Fuel Preparation/Fuel Injection Ω pattern and Special t required 15 Ω. Edition 08.96 ------------ ------------ S00.5109.50.20...
  • Page 80 OCTAVIA Fuel Preparation/Fuel Injection Note: When ♦ ♦ ♦ ♦ ⇒ Important! Fuel system is pressurised! Place cleaning rags around the connection point before opening the system. Then, release pressure by carefully deta- ching the connection point. ------------ 24-44 ------------...
  • Page 81 OCTAVIA Fuel Preparation/Fuel Injection ⇒ Edition 08.96 ------------ ------------ S00.5109.50.20...
  • Page 82 OCTAVIA Fuel Preparation/Fuel Injection ⇒ Note: Before disconnecting the pressure measuring device, release the fuel pressure by opening the shutoff cock. Hold a vessel in front of the connection when carrying out this step. 1552 ♦ ♦ ♦ As a result of the vacuum in the intake system, the leak detection spray is drawn in together with the unmetered air.
  • Page 83 OCTAVIA Fuel Preparation/Fuel Injection → → → Edition 08.96 ------------ ------------ S00.5109.50.20...
  • Page 84 OCTAVIA Fuel Preparation/Fuel Injection air preheater control ♦ ♦ Note: The operation of the thermocouple -2- can be easily checked by spraying it with commercially available refrigerant spray. ------------ ------------ S00.5109.50.20...

  • Page 85: Testing Activated Charcoal Filter Solenoid Valve (N80)

    OCTAVIA Fuel Preparation/Fuel Injection Testing activated charcoal filter solenoid valve (N80) Special tools, testers and aids required ♦ Vehicle system tester V.A.G 1552 with cable V.A.G 1551/3 ♦ Test box V.A.G 1598/22 ♦ Hand-held multimeter, e.g. V.A.G 1526 A or multimeter V.A.G 1715...
  • Page 86 OCTAVIA Fuel Preparation/Fuel Injection Unplug the connector at the ACF valve. Use the hand-held multimeter to carry out a resistance measurement between the contacts of the valve. Specification: 22...30 Ω If the specification is not achieved, replace ACF valve. Testing voltage supply of ACF valve...
  • Page 87 OCTAVIA Fuel Preparation/Fuel Injection If the diode test lamp does not flash or comes on and remains on: Connect the test box V.A.G 1598/22 to the wiring loom to the engine control unit. If the diode test lamp comes on and remains on, test the cable from contact 2 for short to earth.

  • Page 88: Testing Fuel Pump Relay And Actuation

    OCTAVIA Fuel Preparation/Fuel Injection Testing fuel pump relay and actuation Special tools, testers and aids required ♦ Test box V.A.G 1598/22 ♦ Hand-held multimeter, e.g. V.A.G 1526 A or multimeter V.A.G 1715 ♦ Diode test lamp e.g. V.A.G 1527 ♦ Adapter cable set V.A.G 1594 A ♦...
  • Page 89 OCTAVIA Fuel Preparation/Fuel Injection If the diode test lamp again does not come on, test the cable between contact 23 (relay position 4) and fuse 28 for continuity, and rectify any open circuit. ⇒ Current Flow Diagrams, Electrical Fault Finding and Fitting Locations binder If an open circuit is detected, replace the fuel pump relay.
  • Page 90 OCTAVIA Fuel Preparation/Fuel Injection Note: Diode test lamps with a low current consumption do not go out fully but continue displaying a weak light until the starter is operated. If the diode test lamp does not come on, test the wiring as follows: Connect test box V.A.G 1598/22 to the wiring...

  • Page 91: Replacing Engine Control Unit

    OCTAVIA Fuel Preparation/Fuel Injection Replacing engine control unit Note: When the connector is unplugged from the engine control unit, the values are erased; the contents of the fault memory are retained. Removing Switch off the ignition. Remove cover of plenum chamber ⇒ Body Removal and Fitting Work, Repair Group 66.

  • Page 93: Ignition System Page

    OCTAVIA Ignition System Servicing ignition system Survey of ignition components 1 - Ignition transformer (N152) ♦ Testing ⇒ page 28-7 2 - Output stage for ignition transformer (N157) ♦ Testing ⇒ page 28-7 ♦ Only version attached with screws can...

  • Page 94: Disassembling And Assembling Distributor

    OCTAVIA Ignition System 15 - Connector, 2-pin ♦ For knock sensor 16 - Spark plug, 25 Nm ♦ Type and electrode gap ⇒ page 28-3 17 - Spark plug connector ♦ 4...6 k 18 - Ignition cable ♦ Test for continuity...

  • Page 95: Safety Precautions

    OCTAVIA Ignition System Safety precautions Pay attention to the following precautions in order to avoid injuries to persons and/or damage to the fuel injection and ignition system: ♦ Do not touch or disconnect ignition cables when the engine is running or operating at starting speed.

  • Page 96: Testing And Setting Ignition Timing

    OCTAVIA Ignition System Testing and setting ignition timing Special tools, testers and aids required ♦ Vehicle system tester V.A.G 1552 together with cable V.A.G 1551/3 ♦ Ignition tester V.A.G 1767 or V.A.G 1367 together with trigger clamp V.A.G 1367/8 Test conditions l Coolant temperature at least 80 °C...
  • Page 97 OCTAVIA Ignition System 00000000 Note: If one or several places in display field 4 indicate a 1, the test conditions have not been met: ⇒ page 01-19; Meaning of the digits in the 8-digit numerical block. ⇒ ⇒ esting Edition 08.96...
  • Page 98 OCTAVIA Ignition System Ω ------------ ------------ Edition S00.5109.50.20...

  • Page 99: Testing Ignition Transformer

    OCTAVIA Ignition System Testing ignition transformer Special tools, testers and aids required ♦ Hand-held multimeter V.A.G 1526 A or multimeter V.A.G 1715 ♦ Adapter cable set V.A.G 1594 A Test procedure Unplug the connector and ignition cable from the ignition transformer (N152).
  • Page 100 OCTAVIA Ignition System Ω Ω esting Ω ------------ 28-8 ------------ S00.5109.50.20...
  • Page 101 OCTAVIA Ignition System ⇒ Important! When carrying out the following tests, do not touch the connection parts of the ignition transformer or the test cables. esting ♦ ♦ ♦ ♦ Edition 08.96 ------------ 28-9 ------------ S00.5109.50.20...
  • Page 102 OCTAVIA Ignition System Ω ------------ ------------ S00.5109.50.20...

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