VW MKII A2 MK2 Golf Jetta Fox Service Manual - VAGLinks.com

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4F•4 Fuel and exhaust systems - Digifant fuel injection 9 Airflow meter - testing 8.1 Fuel injectors and pressure regulator components A Crankcase, ventilation hose B Vacuum hose 1 Fuel pressure regulator 2 Bracket 3 Bolt 4 Fuel return hose (blue) 2 1 Disconnect the wiring plug from the airflow meter (see illustration). 2 Connect an ohmmeter between terminals 1 and 4 and check that the resistance of the inlet air temperature sender is as shown (see illustration) according to the ambient air temperature. 3 Connect the ohmmeter between terminals 3 and 4 and check that the resistance of the potentiometer is between 0.5 and 1.0 K ohms. 4 Connect the ohmmeter between terminals 2 5 Fuel supply hose (black) 6 Bolt 7 Bracket 8 Crankcase ventilation pressure regulator valve 9 Connector 10 Temperature sender 11 O-ring 12 Fuel distributor 13 Wiring conduit 14 Clip 15 Plug 16 Injector 17 Insert and 3 and check that the resistance fluctuates as the airflow meter plate is moved. 10 Control unit - testing 5 The control unit is located on the left-hand side of the bulkhead. The ignition must always be switched off before disconnecting the plug. It is not possible to test the control unit without using the VW test appliances. If a fault is suspected, the unit should be taken to a VW dealer. 1081 VW Golf & Jetta 11 Overrun cut-off and full throttle enrichment - testing 2 1 Run the engine until the oil temperature is at least 80°C (normal operating temperature) then let the engine idle. 2 Manually close the full throttle valve switch 2 and hold it closed. 3 Open the throttle until the engine speed is approximately 2000 rpm. Check that the engine speed surges, indicating that the overrun cut-off is functioning. 4 If the engine does not surge, disconnect the wiring from the temperature sender and connect a bridging wire between the two contacts on the plug. 5 Repeat the procedure in paragraphs 2 and 3. If the engine now surges, the temperature sender is proved faulty. However, if it still refuses to surge, check the associated wiring and throttle valve switch 2. 6 If no fault is found, renew the control unit. 12 Fuel pumps - testing Pre mid 1989 2 1 The main fuel pump is located in the accumulator housing beneath the rear of the vehicle. An additional lift pump is located in the fuel tank, together with the fuel gauge sender (see illustration). 2 With the engine stopped, have an assistant switch on the ignition. It should be possible to hear both pumps running for a short period. If not, check fuse 5 for continuity and also check all wiring connections. 3 With the ignition on, disconnect each wire connector from the pumps and check that there is a 12 volt supply by using a voltmeter. 4 Should there be no voltage at the pumps with the ignition switched on, the fuel pump relay (No 2 on fusebox) may be faulty. This is best checked by substituting a new relay. From mid 1989 5 From mid 1989, certain models fitted with the Digifant system are fitted with a single fuel pump in the fuel tank rather than the previous arrangement described above. The pump can be tested in the same manner as that described for the previously fitted “in-tank” dual pump. 6 The fuel pump can be removed in a similar manner to that described for the fuel gauge sender unit in Part A of this Chapter, Section 8.
12.1 Fuel pump and filter components 1 Bracket 2 Rubber mounting 3 Nut 4 Fuel supply to fuel distributor 5 Fuel filter 6 Pump accumulator 7 Strainer 8 Fuel pump 9 O-ring 10 Retainer 11 From fuel lift pump in fuel tank 12 Return to fuel tank 13 Return from pressure regulator 14 Adapter Fuel and exhaust systems - Digifant fuel injection 4F•5 1081 VW Golf & Jetta 9.1 Airflow meter components 1 Air cleaner element 2 Cover 3 Bolt 4 Seal 5 Airflow meter 6 Connector 7 Tamperproof plug 8 Mixture (CO content) adjustment screw 9 O-ring 10 Clip 11 Air inlet hose 12 Plate 13 Seal 14 Retaining ring 15 Air cleaner body 16 Rubber washer 17 Temperature regulator 18 Warm air hose 9.2 Inlet air temperature sender resistance graph 4F
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Chapter 1 Routine maintenance and s
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CO content (%) 1.05 litre carburett
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The maintenance intervals in this M
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Maintenance - component location 1
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Maintenance - component location 1
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6 Fluid leakage and engine electric
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9 The engine will turn over more ea
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13 Wipe clean the distributor cap a
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18.13 Using a chain wrench to unscr
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25.3a Bend each brake hose to check
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32.4b . . . loosen front mounting n
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Chapter 2 Part A: Engine repair pro
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1.3 litre: Inlet opens . . . . . .
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difficulty is experienced, it may b
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9 Cylinder head - removal 3 1 If th
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11 Cylinder head - dismantling and
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14.13a Withdrawing crankshaft rear
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21 Crankshaft and bearings - examin
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29.2 Fitting centre main bearing sh
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35.9 Camshaft sprocket (later type)
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Chapter 2 Part B: Engine repair pro
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4.5 Two lengths of metal used to lo
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9 Oil pump - refitting 3 Refitting
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guide the cylinder head into positi
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Chapter 2 Part C: Engine repair pro
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Stem diameter: Inlet . . . . . . .
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1 General information The 1.6 and 1
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26 The engine/gearbox unit is now r
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9.6 Intermediate sprocket timing ma
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and tappet is required. Label the c
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13.1 Sump, oil pump and oil filter
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17 Oil filter - renewal Refer to Ch
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30.3a Fitting flanged type centre m
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etween the camshaft and intermediat
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Chapter 2 Part D: Engine repair pro
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1 General information The 1.8 litre
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Chapter 3 Cooling, heating and air
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1 Radiator 2 Fan ring 3 Expansion t
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2.2 Removing expansion tank cap 2.4
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Refitting 8 Refitting is a reversal
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8.3a Pulling free heater/ventilatio
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11 Air conditioning system compress
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Chapter 4 Part A: Fuel and exhaust
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Carburettor-1.6 litre Pierburg/Sole
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3.6 Air cleaner components - 1.6 an
Page 91 and 92: 6.1 Fuel reservoir location - 1.3 l
Page 93 and 94: etaining clip and then disconnect t
Page 95 and 96: Fuel and exhaust systems - carburet
Page 99 and 100: 15.10 Idle speed (A) and mixture (B
Page 101 and 102: 15.53 Checking choke valve gap (wid
Page 103 and 104: 17.10 Accelerator pump check prepar
Page 105 and 106: 18.3a Unscrew the bolts . . . 18.3b
Page 109 and 110: Chapter 4 Part B: Fuel and exhaust
Page 111 and 112: Fuel supply The fuel pump operates
Page 113 and 114: 4 Switch off all electrical consume
Page 115 and 116: 12.5 Cold acceleration enrichment s
Page 117 and 118: 17 Pressure relief valve - removal,
Page 119 and 120: Fuel and exhaust systems - K-Jetron
Page 121 and 122: Chapter 4 Part C: Fuel and exhaust
Page 123 and 124: 1 To ignition control unit 2 Intake
Page 125 and 126: 6.3 Throttle valve switch adjustmen
Page 127 and 128: Chapter 4 Part D: Fuel and exhaust
Page 129 and 130: 1.0b Mono-Jetronic system inlet man
Page 131 and 132: distance of 4.0 mm by the operating
Page 133 and 134: Chapter 4 Part E: Fuel and exhaust
Page 135 and 136: 3.4 CO analyser and connecting pipe
Page 137 and 138: feed line attachment to the gravity
Page 139 and 140: Chapter 4 Part F: Fuel and exhaust
Page 141: A Front crankcase ventilation valve
Page 145 and 146: Chapter 5 Part A: Ignition system -
Page 147 and 148: 1.1b Contact breaker ignition syste
Page 149 and 150: 7.4 Crankshaft pulley mark (A) timi
Page 151 and 152: Chapter 5 Part B: Ignition system -
Page 153 and 154: Ignition system - transistorised ty
Page 155 and 156: 6.4a TDC blanking plug - manual gea
Page 157 and 158: 7.5 Vacuum unit removal 7.7 Hall se
Page 159 and 160: Chapter 5 Part C: Ignition system -
Page 161 and 162: 6.2 Signal check method from Hall s
Page 163 and 164: Chapter 5 Part D: Starting and char
Page 165 and 166: 4.3 Battery retaining clamp and bol
Page 167 and 168: Chapter 9 Braking system Contents B
Page 169 and 170: 3 Use an Allen key and unscrew the
Page 171 and 172: 3.18 Rear brake caliper components
Page 173 and 174: 4.15 . . . followed by the outer wa
Page 175 and 176: 13 Refit the hydraulic pipe and tig
Page 177 and 178: 19 This method is particularly effe
Page 179 and 180: Chapter 10 Suspension and steering
Page 181 and 182: 1081 VW Golf & Jetta 1.1 Front susp
Page 183 and 184: 3.2 Front suspension camber adjustm
Page 185 and 186: 8.4 Removing rear suspension strut
Page 187 and 188: 11.3b Removing steering wheel centr
Page 189 and 190: 14.4 Steering tie-rod bellows and r
Page 191 and 192: 1081 VW Golf & Jetta Suspension and
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Removal 2 To remove the pump unit,
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Chapter 11 Bodywork and fittings Co
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Repair of rust holes or gashes in b
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hand. A largish screwdriver will ju
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14 Door trim panel - removal and re
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15.3 Removing interior door handle
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22.4 Front bumper bracket securing
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6 Renew any retaining screw locatio
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28.9 Sunroof adjustment dimensions
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31.8 Front seat guide fixing - from
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Chapter 12 Body electrical systems
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k) Never use an ohmmeter of the typ
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6 Headlamp range control - removal
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4 If the indicators do not function
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17.2a Instrument panel unit compone
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Component testing Voltage stabilise
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3 Ease the wiper arm from the spind
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29 Windscreen wiper linkage - remov
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1081 VW Golf & Jetta Wiring diagram
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1081 VW Golf & Jetta Wiring diagram
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Relays (typical) 1 Vacant 2 Intake
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1081 VW Golf & Jetta Diagram 3 Ligh
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1081 VW Golf & Jetta Diagram 7 Brak
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1081 VW Golf & Jetta 12 Diagram 12
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1081 VW Golf & Jetta Diagram 20 Ele
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1081 VW Golf & Jetta Diagram 57 Glo
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