1997 FIAT PUNTO electrical

5A«2 Starting and charging systems
5.9a Unbolting the alternator upper bracket from the rear of the coolant pump
fl Loosen the pivot bolt and adjustment locknut then unscrew the adjustment bolt and swivel the alternator towards the engine so that the drivebefi may be slipped off the alternator pulley. 9 Unscrew and remove the pivot and adjustment bolts and withdraw the alternator Irom the engine compartment. If preferred the upper alternator bracket may bo unbolted from the rear of the coolant pump {see illustrations).
Refitting 10 Refitting is a reversal ot removal. Refer to Chapter tA or 1B as applicable for details of tensioning the auxiliary drivebeit. On completion lighten the pivot and adjustment botts/nut to the specified torque.
6 Alternator -brush holder/regulator module renewal
%
1 Remove the alternator as described in Section 5. 2 Extract the two small bolts and withdraw the brush box. Note the small plastic grille on the Marelli alternator (see illustrations), 3 Using a steol rule chock the length of the brushes. If less than 5.0 mm the complete brush holder assembly should be renewed. Note: On Bosch alternators it may be possible to obtain the brushes separate//, in which case the brush ieads should be unsoldered
5.9b Removing the pivot bolt and alternator from the engine
from ihe terminals and the new brush leads soldered onto the terminals. 4 Check the slip rings for excessive wear and clean them with a rag soaked in fuel. 5 Pit the new holder using a reversal of the removal procedure but make sure that each brush moves freely.
7 Starting system • & testing
Note: Refer to Ihe precautions given In Safety firstI and in Section I of this Chapter before stoning work. 1 If the starter motor falls to operate when the Ignition key Is turned to the appropriate position, the following possible causes may be to blame. aj The battery is faulty. b) The electrical connections between the switch, solenoid, battery and starter motor are somewhere failing to pass the necessary current from the battery through the starter to earth. c) 77:© solenoid is faulty. d) The starter motor is mechanically or electrically defective. 2 To check the battery, switch on the headlights. If they dim after a few seconds, this indicates that the battery is discharged -recharge (see Section 2) or renew the battery. If the headlights glow brightly, operate the ignition switch and observe the lights. If they
dim, then this indicates that current it reaching the starter motor, therefore the iao8 must lie In the starter motor. If the lights continue to glow brightly (and no clicking sound can be heard from the starter motor solenoid), this indicates that there is a lairt
In
the circuit or solenoid - see following paragraphs, if the starter motor turns siowfy when operated, but the battery is In good condition, then this indicates that either lae starter motor is faulty, or there is considers resistance somewhere in the circuit. 3 If a fault in the circuit is suspected, disconnect the battery ieads (including ihe earth connection to the body), lt» starter/solenoid wiring and tne engine/transmission earth strap. ThoroygWy clean the connections, and reconnect the leads and wiring, ihen use a voltmeter or J«i lamp to check that full battery voltage is available at the battery positive lead connection to the solenoid, and that the earth is sound. Smear petroleum jelly around ttie battory terminals to prevent corrosion > corroded connections are amongst the most frequent causes of electrical system faults. 4 If the battery and all connections are in good condition, check the circuit disconnecting the wire from the solenod blade terminal. Connect a voltmeter or less lamp between the wire end and a good earth (such as the battery negative terminal), ais check that the wire is live when tne ignition switch is turned to the start position. If It is. then the circuit is sound - if not. the circut wiring can be checked as described Chapter 12. Section 2. 5 The solenoid contacts can be checked
Oy
connecting a voltmeter or test lamp across Ihe solenoid. When the ignition switch is turned to the start position, there should b»a reading or lighted bulb, as applicable. II thars is no reading or lighted bulb, the solenoid is faulty and should be renewed. 6 If the circuit and solenoid are proves sound, the fault must lie in the starter motor. In this event, it may be possible to have tre starter motor overhauled by a specialist, but check on the cost of spares before proceeding, as It may prove more economical to obtain a new or exchange motor

5B*2 Ignition system - petrol models
1 HT leads 2 Support 3 Cover mounting bdt 4 Ignition coifs
5 Washer 6 Washer 7 Coil mounting bolt
1.2s Ignition coils and HT leads 9 Washer 10 Coil mounting bracket
11
Nut
12 Waslrer 13 Spark plugs 14 Coll cover 15 HT lead support
16 HT lead support 17HTlead support 18 Seat Id Bracket
1 General information
The ignition system is integrated with the fuel injection system to form a combined engine management system under the control of one ECU (see the relevant part of Chapter 4 lor further Information). The Ignition side of the system is of the static (distributorless) type, consisting only of two twin-output Ignition coils located on the left-hand side of the cylinder head. Each ignition coil supplies two cylinders (one coll supplies cylinders 1 and 4, and the other cylinders 2 and 3) (see Illustrations). Under the control of the ECU, the ignition coils operate on the wasted spark principle, ie. each spark plug sparks twice for every cycle of the engine, once on the compression stroke and once on tho exhaust stroke. The spark voltage is greatest in the cylinder which Is under compression, the other cylinder
having a very weak spark which has no effect on the exhaust gases. The ECU uses Its Inputs from the various sensors to calculate the required ignition advance setting and coil chorging time.
1.2b Ignition coll circuit 1 Primary windings 2 Secondary windings 3 Power module
ECU) 4 Spark plugs
2 Ignition system -testing i

A


Warning: Voltages produced
by
an electronic Ignition system an considerably higher than (hose produced by conventional Ignition systems. Extreme care must be tak»n when working on tho system with thi Ignition switched on. Persons wilfl surgically-implanted cardiac pacemaker devices should keep well clear ot the ignition circuits, components and (oaf equipment 1 If a fault appears In the engine management (fuel injection/ignition) system first ensure that the fault is not due to a poor electrical connection or poor maintenance: ie, checK lhat the air cleaner filter element is clean, tht spark plugs are In good condition and correctly gapped, lhat the engine breather hoses are clear and undamaged, referring to

501
Chapter 5 PartC:
Preheating system - diesel models
Contents
Glow plugs - removal, inspection and refitting 2 Preheating system - description and testing 1 Preheating system control unit - removal and refitting 3
Degrees of difficulty

Ea3y, suitable
for &
novice with little
|| experience ^

Fairty easy,
suitable for beginner with
some experience
jQ
Fairty diffctit, ^
suitable
for competent
DIY
mechanic

Difficult, suitable for
experienced DIY JR mechanic ^
Very difficult, ^ suitable fbrexpertDfY JR or professional ^
Specifications
Torque wrench setting Nm ibf ft Heater glow plugs 15 11
1 Preheating system -description and testing
Description 1 Each swirl chamber has a heater plug (commonly called a glow plug) screwed into it. The plugs are electrically-operated before and during start-up when the engine is cold. 2 Electrical feed to the glow plugs Is controlled by a relay/timer unit. The coolant temperature determines the period of heating that takes place. 3 A warning light in the instnjment panel tells the driver that preheating is taking place. When the light goes out, the engine is ready to be started. The voltags supply to the glow plugs continues for several seconds after the light goes out, If no attempt is made to start, the timer then cuts off the supply, In order to avoid draining the battery and overheating the glow plugs.
Testing 4 If the system malfunctions, testing is ultimately by substitution of known good units, but some preliminary checks may be made as follows. 5 Connect a voltmeter or 12-volt test lamp between the glow plug supply cable and earth (engine or vehicle metal). Make sure that the live connection is kept clear of the engine and bodywork. 6 Have an assistant switch on the ignition, and check that vottage is applied to the glow plugs. Note the time for which the warning light Is lit. and the total time for which voltage Is applied before the system cuts out. Switch off the ignition. 7 At an under-bonnet temperature of 20°C. typical times noted should be 5 or 6 seconds for warning light operation, followed by a further 10 seconds supply after the light goes out. Warning light time will increase with lower temperatures and decrease with higher temp-eratures.
8 If there Is no supply at all, the relay or associated winng is at fault. 9 To locate a defective glow plug, disconnect the main supply cable and the interconnecting strap from the top of the glow plugs. Be careful not to drop the nuts and washers. 10 Use a continuity tester, or a 12-voH test lamp connected to the battery positive terminal, to check for continuity between each glow plug terminal and earth. The resistance of a glow plug in good condition is very low (less than 1 ohm), so if the test lamp does not light or the continuity tester shows a high resistance, the glow plug is certainly defective. 11 If an ammeter is available, the current draw of each glow plug can be checked. After an initial surge of 15 to 20 amps, each plug should draw approximately 12 amps. Any plug which draws much more or less than this is probably defective. 12 As a final check, the glow plugs can be removed and Inspected as described in the following Section.

5C«2 Preheating system - diesel models
2.3 No 4 glow plug showing the main supply lead end the interconnecting strap 2.5 Removing a glow plug
2 Glow plugs -removal, Inspection and refitting
Removal Caution: If the preheating system has just been energised, or If tho engine has been running, the glow plugs will be very hot
1 Disconnect the battery negative terminal (refer to Disconnecting the battery in the Reference Section of this manual), 2 Remove Ihe air Inlet ducting from the front of the engine with reference to Chapter 4C, Section 2. 3 Unscrew the nut from the relevant glow plug lerminai(s). and recover the washer(s). Note that tho main supply cable is connected to Number 4 cylinder glow plug and an interconnecting strap lis fitted between the four plugs (see Illustration). 4 Where applicable, carefully move any obstructing pipes or wires lo one side to enable access to the relevant glow plug(s). 5 Unscrew the glow plug(s) and remove from the cylinder head (see illustration).
Inspection 8 Inspect each glow plug for physical damage. Burnt or eroded glow plug tips can bo caused by a bad Injector spray pattern. Have the Injectors checked if this sort of damage is found. 7 If Ihe glow plugs are In good physical condition, check them electrically using a 12 volt test lamp or continuity tester as described in the previous Section. 8 The glow plugs can be energised by applying 12 volts to them to verity that they heat up evenly and In the required time. Observe the following precautions. a) Support the glow plug by clamping it carefully in a vice or selNocking pliers. Remember it will become red-hot. b) Make sura that the power supply or test lead incorporates a fuse or overload trip to protect against damage from a short-circuit. c) After testing, allow the glow plug to cool for several minutes before attempting to handle it. 9 A glow plug In good condition will start to glow red at the tip after drawing current for 5 seconds or so. Any plug which takes much longer to start glowing, or which starts
glowing in the middle instead of at the lip, « defective. Refitting 10 Refit by reversing the removal operations. Apply a smear of copper-based anti-seize compound to the plug threads and tighten Ihe glow plugs to Ihe specified torque. Do not overtighten, as this can damage the glow plug element.
3 Preheating system control unit -removal
and
refitting I
Removal 1 Disconnect the battery negative terminal (refer to Disconnecting the baffery In Ihe Reference Section of this manual). 2 Unscrew the screws and remove the relay cover located at the left-hand end of the engine. 3 Disconnect the wiring then remove the control unit from the bracket. Refitting 4 Refitting is a reversal of removal.

11 *4 Bodywork and fittings
6.3s Remove the screws... 6.3b ... and lower the front section of the plastic wheel arch liners away from the bodywork
6 Front bumper -removal and refitting
Removal 1 Access to the front bumper mountings may be Improved by raising the front ot Ihe vehicle and resting it securely on axle stands (see Jacking and vehicle support), 2 Remove the direction indicator units from both front wings, as described In Chapter 12. Section 6. 3 Remove the screws and lower both plastic wheel arch liners away from the bodywork (see Illustrations), 4 Reach inside the wheel arch and remove the retaining screws from the trailing edges of Ihe bumper moulding (see illustration). 5 Slacken and withdraw the four screws from
6.S Slacken and withdraw the four screws from the lower edge of the bumper the lower edge of the bumper (see illustration). 6 Support Ihe bumper moulding, then remove the four retaining bolts from the upper edge of the bumper (located eithor side of the headlight units) (see Illustration).
7.4 Slacken and withdraw tho four screws 7.5 Remove the four retaining bolts from from the lower edge of the bumper the upper edge of the bumper
6.4 Remove the retaining screws (arrowed) from the trailing odges of the bumper moulding
6.6 Remove the retaining bolts (arrowed) from either side of (he headlight units 7 Where applicable, unplug the wiring from the rear of tho fogiamp units. 8 Unclip any electrical cabling securea to tne rear side of Ihe bumper and then carefully draw the bumper away from fhe front ot the vehicle.
Refitting 9 The bumper is refitted by following the removal procedure in reverse.
7 Rear bumper
-
% removal and refitting
Removal 1 Access to the rear bumper mountings may be improved by raising the rear of the vehicle and resting it securely on axle stands (see Jacking and vehicle support), 2 After removing the retaining screws and nuts, lower both rear wheel arch plastic liners away from the bodywork (see Illustration) ( 3 Reach Inside the rear wheel arches and remove the retaining screws from the leading edges ot the bumper moulding (see illustration). 4 Stackon and withdraw the four screws from the lower edge of the bumper (see illustration). 1 5 Support the bumper moulding, then remove the four retaining bolts from the upper edge ol the bumper (see illustration). 6 Unclip any electrical cabling that may Dt secured to the inside of ihe bumper, thM carefully draw the bumper off its guide brackets and away from the rear ot the vehicle.

11
*8 Bodywork and fittings
14.5a Unscrew the door panel securing screws, located on the edge of the armrest moulding... 5 Unscrew Ihe door panel securing screws, located on Ihe edge of the armrest moulding and around the outside edge of the door trim panel - note that some are concealed beneath plastic caps (see illustrations). 6 Using a Suitable forked tool inserted between the door end the trim panel, release Ihe press-stud clips located around Ihe edge of Ihe panel. Ihen lift the trim panel upwards. Recover the locking knob Inm collars (see illustrations). 7 Pull the panel from the door, noting that Ihe lower window aperture weatherstrip is integral with the trim panel and must bo released from the door as the panel Is withdrawn. B If work Is lo be earned out nn the door Internal oomponenls. it will be necessary to remove the plastic soaling sheet from tho inside ot the door Starl ol one comer of the sheet and carefully peel il away, using a sharp blade to split the sealant bead (see (lustration).
j
14.8a Release the press-stud clips located around the edge of tho panel...
trim collars from above...
14.5b ... and around the outside edge of the door trim panel
9 Store Ihe detached sealing sheet such that it cannot become contaminated with dust: this will allow it to be re-used later.
Refitting 10 Refilling Is a reversal of removal, bearing in mind the following points:
a) Ensure that the sealing sheet is correctly refitted, press it on firmly to ensure that it is adequately sealed around its edges. It should be possible fo use the origins} sealant, but if necessary, new sealant can be obtained from a Fiat dealer. b) Before refitting the trim panel, feed the electric window switch wlnng through the aperture in the front of Ihe panel. c) Make sure that the weatherstrip engages securely with the edge of the door as the panel Is refitted.
i4,6b ... then lift the trim panel upwards...
14.6d ... and below tho panel
15 Door- & removal and refitting is
Note: 7?ws procedure is applicable both to
the
front and rear doors.
Removal Note: A new door check strap rolbpin
win
be requited on refitting. 1 Disconnect the battery negative terminal (refer to O/sconoecf/ng fhe battery In Ihe Reference Section of this manual). 2 Unplug Ihe multiway electrical connector from the inner edge of the door. 3 Have an assistant support the door, then unscrew the door hinges centre bolts, and hit the door from the vehicle.
Refitting 4 Refitting is a reversal of removal. On completion, tighten the hinge centre bolts securely.
Adjustment 5 Close the door carefully, In case the alignment is incorrect, which may cause scratching on the door or the body BS the door is closed, and check the fit ot the door with the surrounding panels. 6 II adjustment Is required, loosen the hinge-to-body securing bolts (the bolt holes are elongated to allow lor adjustment) and move the hinges as required to achieve satisfactory alignment. Tighten the securing bolls securely on completion. 7 Check the operation of the door lock. If necessary, slacken the securing bolts, and adjust Ihe position of Ihe lock striker on the body pillar to achieve satisfactory alignment-Tighten the bolts securely on completion,
16 Door handle and lock components -removal and refitting ^
1 Ensure that the door window glass is in the fully closed position, then disconnect ihe battery negative terminal (refer to Drscoryiecfrrg fhe battery In the Reference Section of this
•
m-i -14.8 Carefully peel the sealing sheet away, using a sharp blade to spilt the sealant bead

11
*10 Bodywork and fittings
17.3a Prise the rubber cover off the adjustment lever... 17.3b ... then unscrew and remove the locking collar 17.4 Remove the plastic trim panel, to expose the mirror securing screws
Ihe rear of the mirror glass, then push tho glass into position fo engage the securing clips.
To aid re fitting, lightly
grease
^•-.—i the securing dips on the mar IjlllliTj of the mirror glass.
17.5a Remove the securing screws .
17 Exterior mirror components - removal and refitting
Mirror assembly
Removal • models with electrically-adjustable mirrors 1 Disconnect the battery negative terminal (refer to Disconnecting the battery in the Reference Section of this manual). 2 Refer to Section 14 and remove the door inner trim panel. Reach inside the door space and unplug the electrical supply to the mirror at the multiway connector. Unclip tho mirror wiring from Ihe door, noting its routing. Removal - models with manually-adjustable mirrors 3 Prise tho nibber cover off the adjustment lever, then unscrew and remove the locking collar (see Illustrations) Ail models 4 Remove the plastic tnm panel, to expose the mirror securing screws (see Illustration). 6 Remove the securing screws, and withdraw the mirror assembly from the door (see illustrations). Refitting 6 Refitting is a reversal of removal. Tighten the mirror securing screws securely. On models with electric mirrors, ensure that the electrical wiring is correctly routed so that it cannot foul the electric window mechanism.
17.6b ... and withdraw the mirror assembly from the door
Mirror glass
Removal 7 On models with electric mirrors, disconnect Ihe battery negative terminal (refer to Disconnecting the battery in the Reference Section of this manual). 8 Insert a suitable thin plastic or wooden tool between the mirror glass and the mirror body, and carefully lever the glass forward to release the securing clips. A Warning: Protect your hands and eyes from glass sp//nfers.
9 Where applicable, disconnect the heater element winng from the rear of the glass, and withdraw the glass from the mirror assembly. Refitting 10 Where applicable, reconnect the wires to
18 Electric window components & - removal and refitting 5
Door window glass
Removal 1 Operate the window regulator mechanism, such that the glass Is positioned halfway down the aperture. On modelo with electric windows, disconnect the battery negative terminal (refer to Disconnecting tho
battery
In the Reference Section of this manual). 2 Remove the door inner inm pane) ond ihe plastic sealing sheet, as described
In
Section
1 3 On three door models, remove the screws at Ihe trailing edge of the door and lift out the window glass rear guide channel. Similarly, remove the screws at the front edge at the door and remove the window glass front guide channel. 4 Support tho glass, (hen unclip the plastic fastener that secures the window glass to the regulator mechanism. Disengage the regulator mechanism from the hole at Ihe base of the window glass (see illustrations).
18.4a Unclip the plastic fastener that socures the window glass to the regulator mechanism
18.4b Disengage the regulator mechanism from the hole (arrowed) at the base of the window glass