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Battery check Ford Focus 2001 - 2005 Diesel 1.8 TDCi

OnDemand step-by-step maintenance & repair BETA

Ford Focus 2001 - 2005  | 1.8 TDCi Battery check

  • time 5 minutes
  • difficulty 1
Locate the battery
Open the battery cover
Check the Negative (-) terminal clamp is tight
Check the Positive (+) terminal clamp is tight. CAUTION – if using a spanner to tighten terminal, be careful not to short the spanner on the bodywork.
Check battery is generally secure, if loose, tighten the battery retainer
The battery retaining clamp position
To tighten, a 13mm socket is needed. Not too tight as you may damage the battery casing
Replace the battery cover. If you have to replace the battery or alternator, click below
- Close + Open

Battery removal & replacement

Battery disconnection

1 Several systems fitted to the vehicle require battery power to be available at all times, either to ensure their continued operation (such as the clock) or to maintain control unit memories (such as that in the engine management system’s ECU) which would be wiped if the battery were to be disconnected. Whenever the battery is to be disconnected, first note the following, to ensure that there are no unforeseen consequences of this action:
  1. First, on any vehicle with central locking, it is a wise precaution to remove the key from the ignition, and to keep it with you, so that it does not get locked in if the central locking should engage accidentally when the battery is reconnected.
  2. The engine management system’s ECU will lose the information stored in its memory – referred to by Ford as the ‘KAM’ (Keep-Alive Memory) – when the battery is disconnected. This includes idling and operating values, and any fault codes detected – in the case of the fault codes, if it is thought likely that the system has developed a fault for which the corresponding code has been logged, the vehicle must be taken to a Ford dealer or suitably-equipped specialist for the codes to be read, using the special diagnostic equipment necessary for this (see Chapter 4A). Whenever the battery is disconnected, the information relating to idle speed control and other operating values will have to be reprogrammed into the unit’s memory. The ECU does this by itself, but until then, there may be surging, hesitation, erratic idle and a generally inferior level of performance. To allow the ECU to relearn these values, start the engine and run it as close to idle speed as possible until it reaches its normal operating temperature, then run it for approximately two minutes at 1200 rpm. Next, drive the vehicle as far as necessary – approximately 5 miles of varied driving conditions is usually sufficient – to complete the relearning process.
  3. If the battery is disconnected while the alarm system is armed or activated, the alarm will remain in the same state when the battery is reconnected. The same applies to the engine immobiliser system (where fitted).
  4. If a trip computer is in use, any information stored in memory will be lost.
  5. If a Ford Keycode audio unit is fitted, and the unit and/or the battery is disconnected, the unit will not function again on reconnection until the correct security code is entered. Details of this procedure, which varies according to the unit and model year, are given in the Ford Audio Systems Operating Guide supplied with the vehicle when new, with the code itself being given in a Radio Passport and/or a Keycode Label at the same time. Ensure you have the correct code before you disconnect the battery. For obvious security reasons, the procedure is not given in this manual. If you do not have the code or details of the correct procedure, but can supply proof of ownership and a legitimate reason for wanting this information, the vehicle’s selling dealer may be able to help.
  6. After reconnecting the battery, it will be necessary to re-initialise each electric window motor separately. Press the ‘close button’ until the window is fully closed, and keep the button pressed for a further second. Release the ‘close’ button, then press it two or three times for a second each time. Press the ‘open’ button and hold it for one second after the window is fully open. Briefly press the ‘close’ button to the second action point - if the procedure has been successful, the window will close automatically. If the window does not close automatically, repeat the procedure. Carry out the procedure on the remaining electric windows.
  7. On diesel models, after reconnecting the battery, turn the ignition switch to position II for 30 seconds to carry out the engine management initialisation procedure. Do not press the accelerator pedal or attempt to start the engine during this 30-second period, or the initialisation procedure will fail.
2 Devices known as ‘memory-savers’ (or ‘code-savers’) can be used to avoid some of the above problems. Precise details vary according to the device used. Typically, it is plugged into the cigarette lighter, and is connected by its own wires to a spare battery; the vehicle’s own battery is then disconnected from the electrical system, leaving the ‘memory-saver’ to pass sufficient current to maintain audio unit security codes and ECU memory values, and also to run permanently-live circuits such as the clock, all the while isolating the battery in the event of a short-circuit occurring while work is carried out.
Warning: Some of these devices allow a considerable amount of current to pass, which can mean that many of the vehicle’s systems are still operational when the main battery is disconnected. If a ‘memory-saver’ is used, ensure that the circuit concerned is actually ‘dead’ before carrying out any work on it.


3 Unclip the battery cover and remove.
4 Disconnect the negative battery lead, followed by the positive lead (see illustrations) . Note that the terminals and clamps are of different diameters, to prevent the leads from being accidentally mis-connected.
Slacken the nut and disconnect the negative lead clamp . . .
. . . followed by the positive lead
5 Remove the battery hold-down strap (see illustration) . Where applicable, remove the clamp from the battery tray.
Undo battery retaining bolt
6 Lift out the battery.
Caution: The battery is heavy.
7 Whilst the battery is out, inspect and clean the battery tray.
8 If you are renewing the battery, make sure that you get one that’s identical, with the same dimensions, amperage rating, cold cranking rating, etc. Dispose of the old battery in a responsible fashion. Most local authorities have facilities for the collection and disposal of such items – batteries contain sulphuric acid and lead, and should not be simply thrown out with the household rubbish.


9 Refitting is the reverse of the removal procedure. Note: Refer to the information given at the start of this procedure.
- Close + Open

Alternator replacement


1 Disconnect the battery negative (earth) lead.
2 Remove the auxiliary drivebelt.

1.4 and 1.6 litre petrol engine

3 Remove the plastic cover, unscrew the nut and disconnect the wiring from the alternator (see illustration) .
Disconnecting the wiring connector
4 Remove the lower mounting bolt, and also the upper securing bolt and nut from the alternator (see illustration) .
Undo the upper securing bolt and nut
5 Carefully lift the alternator upwards from the engine. Take care not to damage the surrounding components, as there is little room to manoeuvre the alternator.

1.8 and 2.0 litre petrol engine

6 Undo the securing bolt from the coolant expansion tank, lift out from securing clip and move to one side (see illustrations) .
Remove the securing bolt...
...and lift the tank off from the securing clip
7 Lift the power steering reservoir from its retaining bracket and move to one side (see illustration) .
Lift reservoir from the retaining bracket
8 Undo the securing bolt from the wiring loom bracket, and move the wiring to one side (disconnect the multi-plug) (see illustrations) .
Unbolt the wiring clip . . .
. . . then disconnect the block connector
9 Undo the bolt from the power steering reservoir bracket to release the earth cable (to aid the removal of the alternator, carefully bend the earth bracket down) (see illustrations) .
Unbolt the earth cable . . .
. . . then carefully bend the bracket down
10 Undo the two retaining bolts from the canister purge valve and move to one side (see illustration) .
Disconnect the wiring connector, and move the canister to one side
11 Remove the plastic cover, unscrew the nut and disconnect the wiring from the back of the alternator.
12 Unscrew and remove the alternator mounting bolt nearest the engine (see illustration) . Unscrew the other retaining bolt until it has fully disengaged from the bracket (it will not be possible to remove the bolt from the alternator at this stage) (see illustration) .
Remove the bolt . . .
. . . and remove the lower bolt as far the inner wing
13 Carefully lift the alternator from the engine, turning it with the pulley facing upwards. Take care not to damage the surrounding components on removal, as there is little room to manoeuvre the alternator (see illustration) .
Turn and lift the alternator out with the pulley facing upwards

Diesel engine

14 Remove the engine undershield.
15 On vehicles with air conditioning, undo the four bolts from the air conditioning compressor and remove to one side.
Caution: Do not disconnect the refrigerant pipes.
16 Remove the plastic cover, unscrew the nut and disconnect the wiring from the alternator.
17 Undo the two pulley bracket bolts, then loosen the three generator coupling bolts and remove the coupling (see illustrations) .
Undo the two pulley bolts . . .
. . . loosen the three coupling bolts . . .
. . . and remove the coupling from the alternator
18 Unscrew the alternator mounting bolts and carefully lift the alternator from the engine

All models

19 If you are renewing the alternator, take the old one with you. Make sure that the new or rebuilt unit is identical to the old alternator. Look at the terminals – they should be the same in number, size and location as the terminals on the old alternator. Finally, look at the identification markings – they will be stamped in the housing, or printed on a tag or plaque affixed to the housing. Make sure that these numbers are the same on both alternators.
20 Many new/rebuilt alternators do not have a pulley installed, so you may have to switch the pulley from the old unit to the new/rebuilt one. When buying an alternator, ask about the installation of pulleys – some auto-electrical specialists will perform this service free of charge.


Note: One of the mounting bolts on the 1.8 litre and 2.0 litre petrol engine will need to be put in place before refitting the alternator (see paragraph 12).
21 Refitting is the reverse of the removal procedure, referring where necessary to the relevant Chapters of this manual. Tighten all nuts and bolts to the specified torque wrench settings.
Alternator: Nm Ibf ft
  Coupling bolts (diesel engine) 12 9
  Mounting bolts:
    Petrol engine 45 33
    Diesel engine 25 18
  Mounting nuts (petrol engine) 45 33
  Pulley bracket bolts (diesel engine) 25 18
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