QuestionQUESTION: Hi,sorry for the English cause I'm french,
I explain the problem : when i turn the key on position 2,(battery and brake lights are on), i usually hear the bzzzzz of the pump. but since 3 days, nothing and it's not possible to start.
I look the pump which at the top of the fuel tank and the voltage on the connector is 6,7V. Is it normal?
I don't know if it's the pump i usually hear because after reading differents informations, there is another pump behind the right rear wheel. I look the voltage too and it's 12V but heard nothing.
So have you any ideas for these problem.
Thanks a lot.
ANSWER: Bonjour Kevin,
votre Anglais est tres bien. Pardon, notre website est simple, donc tous les accents etait perdue. Pardon mon Français, je suis Anglais. Je vais ecrit dans Anglais pour les autres ...
Do you know where the inertia switch is on your Freelander? Press down on the rubber button of the inertai switch to reset this safety device.
The fuel pump relay connects to the fuel pump via the inertia switch. If the switch was tripped (activated), the electrical circuit is broken and no fuel will be delivered from the pump.
You can also tested the fuel pump relay. In my Disco, when I do the same as you (meme choise de vous), I always here the fuel pump relay start.
Bon chance - best of luck,
JohnMc
---------- FOLLOW-UP ----------
QUESTION: Thanks for your fast answer. Don't worry for your french, it's good.
For the inertia switch, i already pushed it several times, in different condition
: turned key on position 2 or position 0, an nothing.
for the fuel pump relay, what can i do to test? I hear many relay switching on
when i turn the key but is it the right one...
is it before the fuse or after? because the voltage on the fuse is 12V. If it's
before, that significate it is on and it's ok.
AnswerHi Kevin,
Perhaps this will help:
CHARGING AND STARTING – Td4
DESCRIPTION
Starting
The starting system on the vehicle comprises a 12 volt starter motor which drives the engine to start the combustion process. The starter converts electrical energy into mechanical power. The vehicle electrical system must be capable of supplying sufficient power to enable the engine to be cranked.
Charging
The charging system comprises a battery and an alternator. The battery must be of a sufficient capacity to operate the starter motor and operate various electrical systems in the vehicle. The alternator charges the battery when the engine is running and increases its output as demand on the battery increases.
The instrument pack incorporates a charge warning lamp which illuminates when there is no output or a low output from the alternator. For a detailed description of the charging and starting system, refer to the Engine Management Systems – EDC section of the System Description and Operation Workshop manual.
OPERATION
General
Feed from the positive battery terminal (C0192) is supplied to the main relay, fusible link 1, fusible link 3, fusible link 6, and fuse 10 (C0632) on an R wire. All are located in the engine compartment fuse box. The battery (C0192) also supplies a constant feed to the starter motor solenoid (C0631) on an R wire.
Fusible link 1 is connected in series with fusible link 7, which is also located in the engine compartment fuse box.
Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 6, fuse 8, and fuse 19 of the passenger compartment fuse box (C0588) on a G wire.
When the ignition switch is turned to the 'crank' position, current flows across the switch (C0028) to fuse 5 of the passenger compartment fuse box (C0588) on a WR wire.
Starting
Main Relay
The earth path for the main relay coil (C0576) is controlled by the Engine Control Module (ECM) (C0603) on a WK wire. The energised main relay provides a feed to fuse 1 which is also located in the engine compartment fuse box. Fuse 1 (C0576) provides a feed to the glow plug relay (C0215) on an RW wire.
For a detailed description of main relay operation, refer to the Engine Management Systems – EDC section of the System Description and Operation Workshop manual.
Inertia Switch
Fuse 10 of the engine compartment fuse box (C0575) provides a constant battery feed to the inertia switch (C0123) on a G wire. The inertia switch is a normally closed switch. If the inertia switch hasn't been tripped, current flows across the switch (C0123) to the fuel pump relay coil (C0730) on a GU wire.
The inertia switch (C0123) also provides a feed to the Central Control Unit (CCU) (C0428) on a GU wire. For more information on the CCU, refer to the Control Units section of the Workshop manual, and the Anti-theft Alarm and Central Door Locking (CDL) section of this manual.
ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).
Fuel Pump Relay
The fuel pump relay coil (C0730) receives a feed from the inertia switch (C0123) on a GU wire. The earth path for the relay coil (C0730) is controlled by the ECM (C0331) on a BP wire. The energised fuel pump relay enables a feed from fuse 10 of the engine compartment fuse box (C0575) to flow across the relay switch contacts to the tank mounted fuel pump (C0114) and the secondary fuel pump (C0205) on WP wires. Both pumps are earthed on B wires.
Glow Plug Relay
Fuse 6 of the passenger compartment fuse box (C0581) provides an ignition feed to the ECM (C0603) on a W wire. If all criteria are met, the ECM (C0606) provides an earth path for the glow plug relay coil (C0215) on a BR wire.
Fusible link 6 of the engine compartment fuse box (C0577) provides a constant battery feed to the glow plug relay switch (C0215) on an NW wire. When the relay is energised, the switch contacts close, allowing the glow plug relay to provide a feed to the following:
To glow plug number 1 (C0476) on a BG wire.
To glow plug number 2 (C0477) on a BP wire.
To glow plug number 3 (C0478) on a BY wire.
To glow plug number 4 (C0479) on a BR wire.
For more details of glow plug operation, refer to the Engine Management Systems – EDC section of the Workshop manual.
Starter Relay
Fuse 5 of the passenger compartment fuse box (C0581) provides an ignition switch 'crank' feed to the immobilisation ECU (C0059) on a WR wire. If the vehicle has been successfully re-mobilised, the immobilisation ECU (C0059) provides a feed to the starter relay coil(C0576) on an RW wire. The starter relay is located in the engine compartment fuse box, and is earthed (C0576) on a B wire. A battery feed from fusible link 7 is now able to flow across the starter relay switch contacts (C0572) to the starter motor solenoid (C0178) on an NR then B wire.
For a detailed description of the immobilisation ECU, refer to the Engine Immobilisation section of this manual.
ENGINE IMMOBILISATION.
Starter Motor and Starter Motor Solenoid
The starter motor solenoid coil (C0178) receives a feed from the energised starter motor relay (C0572) on an NR then B wire (see above). The energised starter motor solenoid allows a battery feed (C0178) to flow across the switch contacts and power the starter motor.
Central Control Unit (CCU)
The CCU (C0428) receives a feed from the inertia switch (C0123) on a GU wire. If this feed is removed due to the inertia switch being tripped, the CCU will unlock all of the doors. For more details of CCU operation, refer to the Control Units section of the Workshop manual.
For more details of the Central Door Locking (CDL) system, refer to the Anti-theft Alarm and Central Door Locking (CDL) section of this manual.
ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).
NOTE: The CCU will only unlock all doors if the ignition switch is in the 'ignition' position.
The CCU (C0429) also provides a signal feed to the immobilisation ECU (C0059) on a KN wire. This signal feed informs the immobilisation ECU to energise the starter relay. For a detailed description of the immobilisation ECU, refer to the Engine Immobilisation section of this manual.
FUEL PUMP DESCRIPTION
Td4
The fuel system on Td4 vehicles features two fuel pumps. A low pressure fuel pump is mounted in the plastic fuel tank, and delivers Diesel fuel to the high pressure Fuel Injection Pump (FIP). The system also incorporates a spill return line, which returns any unused Diesel fuel back to the tank. For more information on the Td4 fuel system, refer to the Fuel Delivery System – Td4 section of the System Description and Operation Workshop manual.
OPERATION
Td4 General
Feed from the positive battery terminal (C0192) is supplied to fusible link 3, fuse 10, and the main relay (C0632) on an R wire. All are located in the engine compartment fuse box.
Operation of the main relay (C0576) is controlled by the Engine Control Module (ECM) (C0603) on a WK wire. For more information on main relay operation, refer to the Engine Management Systems – EDC section of the System Description and Operation Workshop manual.
Fuse 10 (C0575) provides a constant battery feed to the inertia switch (C0123) and the fuel pump relay (C0730) on G wires. Fusible link 3 (C0571) provides a constant battery feed to the ignition switch (C0028) on an N wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 6 of the passenger compartment fuse box (C0588) on a G wire. Fuse 6 (C0581) provides an ignition feed to the ECM (C0603) on a W wire.
Inertia Switch
Fuse 10 of the engine compartment fuse box (C0575) provides a constant battery feed to the inertia switch (C0123) on a G wire. The inertia switch is a normally closed switch. If the inertia switch hasn't been tripped, current flows across the switch (C0123) to the fuel pump relay coil (C0730) on a GU wire.
The inertia switch (C0123) also provides a feed to the Central Control Unit (CCU) (C0428) on a GU wire. For more information on the CCU, refer to the Control Units section of the System Description and Operation Workshop manual, and the Anti-theft Alarm and Central Door Locking (CDL) section of this manual.
ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).
Fuel Pump Relay
The fuel pump relay coil (C0730) receives a feed from the inertia switch (C0123) on a GU wire. The earth path for the relay coil (C0730) is controlled by the ECM (C0331) on a BP wire. The energised fuel pump relay enables a feed from fuse 10 of the engine compartment fuse box (C0575) to flow across the relay switch contacts to the tank mounted low pressure fuel pump (C0114) and the Fuel Injection Pump (FIP) (C0205) on WP wires. Both pumps are earthed on B wires.
Having 6.7v at the pump may be the key. I read somewhere that with TD's voltage will vary. Perhaps at startup, having less than 12v would affect the fuel flow. For some TD's, 6.7v at idle may be normal, the voltage being regulated. Perhaps when boost is achieved (plenum pressure above atmospheric), the full system voltage is achieved at the pump.
The best fuel relay test is to swap out the old one with a new one. They are not that expensive. Another way is to touch relay while attempting to start engine - feel for a click.
Regards,
JohnMc
