2008 Skoda Octavia 1.9 tdi
Fuel pump relay not triggering.

Avatar
JOHN
Driver
1 points

Problem added: Nov 6, 2020 (3 weeks ago)
Car won't start. Traced to fuel pump relay not operating. Replacement relay makes no difference but removing top of relay and pressing contacts together cures problem. Car starts and runs no problem. Fault must be with whatever controls the operation of the relay but from there I am completely lost. No fault codes showing. Help!

Car details
Car: Skoda Octavia
Variant: 1.9 tdi
Model Year: 2008
Category: Electrics, ECU, Warnings & Lights
Replies and Fixes
Avatar
whittingehame
Legend
15,944 points

Nov 6, 2020 (3 weeks ago)
Checked the fuses ?

Skoda Octavia (2007) – fuse box diagram
Year of production: 2007

Fuse box in engine compartment
Version 1
Skoda Octavia - fuse box - engine compartment
Skoda Octavia – fuse box – engine compartment (version 1)
Number Power consumer Amperes
F1 Pump for ABS 30
F2 Valves for ABS 30
F3 Not assigned —
F4 Measuring circuit 5
F5 Horn 15
F6 Valve for fuel dosing 15
F7 Not assigned —
F8 Not assigned —
F9 Activated charcoal filter, exhaust gas recirculation valve 10
F10 Leakage diagnosis pump 10
F11 Lambda probe upstream of catalytic converter, engine control unit 10
F12 Lambda probe downstream of catalytic converter 10
F13 Control unit for automatic gearbox 15
F14 Not assigned —
F15 Coolant pump 10
F16 Windshield wiper lever and turn signal light lever 5
F17 Instrument cluster 5
F18 Audio amplifier (sound system) 30
F19 Radio 15
F20 Phone 5
F21 Not assigned —
F22 Not assigned —
F23 Engine control unit 10
F24 Control unit for CAN databus 5
F25 Not assigned —
F26 Not assigned —
F27 Not assigned —
F28 Engine control unit 25
F29 Actuation for coolant pump after-running 5
F30 Control unit for auxiliary heating 30
F31 Front window wiper 30
F32 Not assigned —
F33 Not assigned —
F34 Not assigned —
F35 Not assigned —
F36 Not assigned —
F37 Not assigned —
F38 Radiator fan, valves 10
F39 Clutch pedal switch, brake pedal switch 5
F40 Ignition coils 20
F41 Not assigned —
F42 Actuation of fuel pump 5
F43 Not assigned —
F44 Not assigned —
F45 Not assigned —
F46 Not assigned —
F47 Central control unit, Left main headlights 30
F48 Central control unit, Right main headlights 30
F49 Power supply for terminal 15 (ignition on) 40
F50 Not assigned —
F51 Not assigned —
F52 Power supply relay – terminal X a) 40
F53 Accessory equipment 50
F54 Not assigned —
a) In order not to drain the battery unnecessarily when starting the engine, the electrical components of this terminal are automatically switched off.
Version 2
Skoda Octavia - fuse box - engine compartment (version 2)
Skoda Octavia – fuse box –
engine compartment (version 2)
Number Power consumer Amperes
F1 Not assigned —
F2 Windshield wiper lever and turn signal light lever 5
F3 Measuring circuit 5
F4 Valves for ABS 30
F5 Control unit for automatic gearbox 15
F6 Instrument cluster 5
F7 Not assigned —
F8 Radio 15
F9 Phone 5
F10 Engine control unit, Main relay 5
F11 Control unit for auxiliary heating 20
F12 Control unit for CAN databus 5
F13 Engine control unit 15
F14 Ignition 20
F15 Lambda probe, NOx-sensor, Fuel pump relay 15
Glow plug system relay 5
F16 Pump for ABS 30
F17 Horn 15
F18 Amplifier for digital sound processor 30
F19 Front window wiper 30
F20 Not assigned 5
F21 Lambda probe 15
F22 Clutch pedal switch, brake pedal switch 5
F23 Secondary air pump 5
Air mass meter 10
Fuel high pressure pump 15
F24 Activated charcoal filter, exhaust gas recirculation valve 10
F25 Right lighting system 30
F26 Left lighting system 30
F27 Secondary air pump 40
Preglowing 50
F28 Power suppy terminal 15, Starter 40
F29 Power supply terminal 30 50
F30 Terminal Xa) 40
a) In order not to drain the battery unnecessarily when starting the engine, the electrical components of this terminal are automatically switched off.
Fuse box in dash panel
Skoda Octavia - fuse box - dash panel
Skoda Octavia – fuse box –
dash panel
Number Power consumer Ampere rating [A]
1 Diagnostic socket, Engine control unit, Electrical fuel pump 10
2 Control unit for ABS, ESP 5
3 Airbag 5
4 Heating, Air conditioning system, Reversing lights 5
5 Control unit for headlamp beam adjustment 5
6 Instrument cluster, Control unit for automatic gearbox, Control unit for electromechanical power steering, Parking aid; Haldex clutch 5
7 Not assigned —
8 Not assigned —
9 Not assigned —
10 Not assigned —
11 Not assigned —
12 Central locking control unit 10
13 Diagnostic socket, Light switch, Brake light 10
14 Control unit for automatic gearbox, Selector lever lock 5
15 Central control unit – interior lights 7,5
16 Climatronic 10
17 Not assigned —
18 Parking aid 5
19 Control unit for trailer detection 5
20 Uphill-Start off-Assist 5
21 Not assigned —
22 Air blower for Climatronic 40
23 Front power window 30
24 Cigarette lighter 25
25 Rear window heater 25
Rear window heater, Auxiliary heating (auxiliary heating and ventilation 30
26 Power socket in the luggage compartment 20
27 Fuel pump relay, Injection valves (diesel engine) 15
28 Not assigned —
29 Engine control unit, Crankcase ventilation heater 10
30 Control unit for automatic gearbox 20
31 Vacuum pump 20
32 Rear power window 30
33 Electric sliding/tilting roof 25
34 Control unit for convenience functions 20
35 Anti-theft alarm system 5
36 Headlight cleaning system 20
37 Front seat heating 30
38 Heated rear seats 30
39 Not assigned —
40 Air blower for heating and air conditioning 40
41 Rear window wiper 15
42 Wipe wash pump for windscreen 15
43 Towing device 15
44 Towing device 20
45 Towing device 15
46 Heated windscreen washer nozzles 5
47 Relay for auxiliary heating 5
48 Not assigned —
49 Light switch 5
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
Avatar
JOHN
Driver
1 points

Nov 6, 2020 (3 weeks ago)
Replying to post by whittingehame:
Checked the fuses ?

Skoda Octavia (2007) – fuse box diagram
Year of production: 2007

Fuse box in engine compartment
Version 1
Skoda Octavia - fuse box - engine compartment
Skoda Octavia – fuse box – engine compartment (version 1)
Number Power consumer Amperes
F1 Pump for ABS 30
F2 Valves for ABS 30
F3 Not assigned —
F4 Measuring circuit 5
F5 Horn 15
F6 Valve for fuel dosing 15
F7 Not assigned —
F8 Not assigned —
F9 Activated charcoal filter, exhaust gas recirculation valve 10
F10 Leakage diagnosis pump 10
F11 Lambda probe upstream of catalytic converter, engine control unit 10
F12 Lambda probe downstream of catalytic converter 10
F13 Control unit for automatic gearbox 15
F14 Not assigned —
F15 Coolant pump 10
F16 Windshield wiper lever and turn signal light lever 5
F17 Instrument cluster 5
F18 Audio amplifier (sound system) 30
F19 Radio 15
F20 Phone 5
F21 Not assigned —
F22 Not assigned —
F23 Engine control unit 10
F24 Control unit for CAN databus 5
F25 Not assigned —
F26 Not assigned —
F27 Not assigned —
F28 Engine control unit 25
F29 Actuation for coolant pump after-running 5
F30 Control unit for auxiliary heating 30
F31 Front window wiper 30
F32 Not assigned —
F33 Not assigned —
F34 Not assigned —
F35 Not assigned —
F36 Not assigned —
F37 Not assigned —
F38 Radiator fan, valves 10
F39 Clutch pedal switch, brake pedal switch 5
F40 Ignition coils 20
F41 Not assigned —
F42 Actuation of fuel pump 5
F43 Not assigned —
F44 Not assigned —
F45 Not assigned —
F46 Not assigned —
F47 Central control unit, Left main headlights 30
F48 Central control unit, Right main headlights 30
F49 Power supply for terminal 15 (ignition on) 40
F50 Not assigned —
F51 Not assigned —
F52 Power supply relay – terminal X a) 40
F53 Accessory equipment 50
F54 Not assigned —
a) In order not to drain the battery unnecessarily when starting the engine, the electrical components of this terminal are automatically switched off.
Version 2
Skoda Octavia - fuse box - engine compartment (version 2)
Skoda Octavia – fuse box –
engine compartment (version 2)
Number Power consumer Amperes
F1 Not assigned —
F2 Windshield wiper lever and turn signal light lever 5
F3 Measuring circuit 5
F4 Valves for ABS 30
F5 Control unit for automatic gearbox 15
F6 Instrument cluster 5
F7 Not assigned —
F8 Radio 15
F9 Phone 5
F10 Engine control unit, Main relay 5
F11 Control unit for auxiliary heating 20
F12 Control unit for CAN databus 5
F13 Engine control unit 15
F14 Ignition 20
F15 Lambda probe, NOx-sensor, Fuel pump relay 15
Glow plug system relay 5
F16 Pump for ABS 30
F17 Horn 15
F18 Amplifier for digital sound processor 30
F19 Front window wiper 30
F20 Not assigned 5
F21 Lambda probe 15
F22 Clutch pedal switch, brake pedal switch 5
F23 Secondary air pump 5
Air mass meter 10
Fuel high pressure pump 15
F24 Activated charcoal filter, exhaust gas recirculation valve 10
F25 Right lighting system 30
F26 Left lighting system 30
F27 Secondary air pump 40
Preglowing 50
F28 Power suppy terminal 15, Starter 40
F29 Power supply terminal 30 50
F30 Terminal Xa) 40
a) In order not to drain the battery unnecessarily when starting the engine, the electrical components of this terminal are automatically switched off.
Fuse box in dash panel
Skoda Octavia - fuse box - dash panel
Skoda Octavia – fuse box –
dash panel
Number Power consumer Ampere rating [A]
1 Diagnostic socket, Engine control unit, Electrical fuel pump 10
2 Control unit for ABS, ESP 5
3 Airbag 5
4 Heating, Air conditioning system, Reversing lights 5
5 Control unit for headlamp beam adjustment 5
6 Instrument cluster, Control unit for automatic gearbox, Control unit for electromechanical power steering, Parking aid; Haldex clutch 5
7 Not assigned —
8 Not assigned —
9 Not assigned —
10 Not assigned —
11 Not assigned —
12 Central locking control unit 10
13 Diagnostic socket, Light switch, Brake light 10
14 Control unit for automatic gearbox, Selector lever lock 5
15 Central control unit – interior lights 7,5
16 Climatronic 10
17 Not assigned —
18 Parking aid 5
19 Control unit for trailer detection 5
20 Uphill-Start off-Assist 5
21 Not assigned —
22 Air blower for Climatronic 40
23 Front power window 30
24 Cigarette lighter 25
25 Rear window heater 25
Rear window heater, Auxiliary heating (auxiliary heating and ventilation 30
26 Power socket in the luggage compartment 20
27 Fuel pump relay, Injection valves (diesel engine) 15
28 Not assigned —
29 Engine control unit, Crankcase ventilation heater 10
30 Control unit for automatic gearbox 20
31 Vacuum pump 20
32 Rear power window 30
33 Electric sliding/tilting roof 25
34 Control unit for convenience functions 20
35 Anti-theft alarm system 5
36 Headlight cleaning system 20
37 Front seat heating 30
38 Heated rear seats 30
39 Not assigned —
40 Air blower for heating and air conditioning 40
41 Rear window wiper 15
42 Wipe wash pump for windscreen 15
43 Towing device 15
44 Towing device 20
45 Towing device 15
46 Heated windscreen washer nozzles 5
47 Relay for auxiliary heating 5
48 Not assigned —
49 Light switch 5
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
Have already checked all the fuses in both boxes. There is power to the relay but it won't contact.
Avatar
whittingehame
Legend
15,944 points

Nov 6, 2020 (3 weeks ago)
Checked the crank sensor for non start ?
Avatar
bustedknuckles
Legend
2,156 points

Nov 7, 2020 (3 weeks ago)
You must be getting PWR and earth at that relay 30 being your power supply as when you are pushing the contacts it works ,so other side that energies the relay is not functioning,If you check there maybe a system relay that is faulty ,should look similar to your fuel pump one,unless it’s a wiring short issue.
Avatar
JOHN
Driver
1 points

Nov 7, 2020 (3 weeks ago)
Replying to post by whittingehame:
Checked the crank sensor for non start ?
No - Would it still start manually if the crank sensor was faulty? How can I check it?
Avatar
JOHN
Driver
1 points

Nov 7, 2020 (3 weeks ago)
Replying to post by bustedknuckles:
You must be getting PWR and earth at that relay 30 being your power supply as when you are pushing the contacts it works ,so other side that energies the relay is not functioning,If you check there maybe a system relay that is faulty ,should look similar to your fuel pump one,unless it’s a wiring short issue.
Hi - The under bonnet fuse box is not the same as those in the handbook . It only has one relay which is the fuel pump one. I have replaced the fuse in the dash board fuse box which is described as fuel relay activator although it was OK anyway. There are other relays hidden behind the cowling under the steering column but I have no idea what they are for.
Avatar
JOHN
Driver
1 points

Nov 18, 2020 (1 week ago)
Have looked at some older postings and they refer to a 109 relay on the board under the dashboard of most VW associated cars. It powers the ECU and it in turn powers the fuel pump relay under the bonnet. But they also mention that some MK2 Skodas are different does anyone know what the equivelant is on the tdi. How to identify it and where to find it. Haynes hardly mentions relays at all.
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