battery Citroen CX 1979 1.G Workshop Manual

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 01 : 1’. I, -1’ IO c ( lOi, o/ I/J<, c~lcrlricnl /l/lilS. Op. MA. 01 1 PROTECTION OF THE ELECTRICAL UNITS
PRECAUTIONS WHEN CARRYING OUT WORK ON THE CAR
1. Battery :
a) Disconnect the negative terminal first, then the positive one.
b) Ensure the battery is properly connected, with the negative terminal being connected
to earth.
c) Carefully connect both leads to the battery terminals, the negative lead being connected
last.
Before connecting the negative lead ensure that there is no flow of current. This can
be established by briefly touching the negative terminal pith the lead end : sparks
indicate a short circuit which must be corrected first.
d) Before using the starter ensure that the two leads are correctly tightened on their
respective terminals. $ 2. Alt ernator-Regulator :
a) Do not rotate the alternator unless it is connected to the battery.
0
2
2 b) Before connecting the alternator ensure that the battery is correctly connected
2 (negative terminal to earth ).
c) Do not check the operation of the alternator by short-circuiting either the positive or
the u EXC )) terminals and the earth terminal.
d) Take care not to reverse the leads connected to the regulator.
e) Do not attempt to re-energize the alternator : this is never necessary and in any case
would damage both the alternator and the regulator.
f ) Do not connect a suppressor capacitor at the u EXC )) terminal of the alternator or the
regulator.
g) Do not connect a charging unit to the battery and never carry out arc welding ( or spot
welding) on the car chassis unless both the positive and the negative leads are
disconnected from the battery. 3. Ignition coil :
4. Q.I. Headlamps :
a) Connect the supply lead of the coil to the external ballast resistor terminal and not to
the coil itself.
b) Connect the suppressor with a jump lead to the feed terminal of the coil. Only fit the
suppressor recommended by the factory.
a) Only replace a Q.I. bulb with the headlamps switched off. After having used the head-
lamps, it is wise to let them cool down for five minutes before handling.
b) Do not touch a Q.I. bulb with bare fingers. Any fingerprints on the bulb must be cleaned
off with soapy water and the bulb dried with a lint-free cloth.

Downloaded from www.Manualslib.com manuals search engine 2
OPERATION No MA. 02 : I!‘orki//g OI/ hyc/rt/t/lic s\,s/vN/.
5. PRECAUTIONS TO BE TAKEN BEFORE WORKING ON THE HYDRAULIC SYSTEM :
a) (.~rvJuI/)~ CIVOII the area of work, the unions and the unit to be removed
Disconnect the lead from the negative terminal of the battery
Only use petrol or lead-free petrol for cleaning.
b ) I~~J/VNSO
the /)twsure in the circuits
- Place the vehicle in the G /arc B
position. stop the engine.
- Slacken the Pressure Requlator release screw.
Wait until the front of the car has reached the low position 6, PRECAUTIONS TO BE TAKEN DURING REMOVAL :
a) t3lnuk o!! the w~~tnl pi/~es with plugs, and rubber tubes with round pins of the correct diameter
b)
t3lmk of/ //IV op,c,/li,lg.s of components with pluqs of the correct diameter
NOTE : Plugs and pins must be carefully cleaned before insertion. 7.. CHECK OR TEST OF HYDRAULIC UNITS :
- Use 3654-T t~sf hc~~c-h equipped and designed for use with LHM fluid
This bench is /)ciitltc’d ~IY’~‘~/ and its accessories are marked in green.
- Never use the bench with another fluid or for testing components operating with another fluid (units of a (( D ))
car using LHS2 for instance ).
NOTE The (< Le Bozec )) pump used on test benches for checking DIESEL injectors can be resorted to for
testing components operating with LHM mineral fluid provided that the bench is cleaned first. 8. PRECAUTIONS TO BE TAKEN DURING REFITTING :
E steel pipes must be blown through with compressed air,
5 rubber tubes and joints must be washed in petrol or white spirit and then dried with compressed air,
= hydraulic units must also be cleaned with petrol or white spirit and blown through with compressed air.
NOTE Renew all joints and seals during refittinq .
b
) 12rlbrijicntim :
- Follow the indications as stated in the operations in the Manual..
- Joints and internal parts must be liqhtly oiled hefore fitting ( use mineral fluid LHM only )
L If parts in contact with hydraulic units have to be qreased use a mineral grease only ( as employed for
Cardan shafts or bearings ).

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 112-O : ChcJcking and adjusting the valrv mechanism. Op. MA. 112-O
1
ADJUSTING THE ROCKER ARMS
Ir
E
2 Rotating the crankshaft :
7
m
Vc,birlvs /i//cd wifh n WRIINRI ~varbot :
E Raise one front wheel of the vehicle,
and engage 4th or 5th gear in order to rotate the crankshaft by means of the
3
6 raised wheel.
I
e Vchirlcs /ittcd wilh a lo~qnr covwrlc~ :
- There are two methods for rotating the crankshaft :
Gz feed the
starter using CI G-volt battery,
;
remove the protective plate under the converter casing, and rotate it using a screwdriver.
:
Never attempt to rotate the engine using the camshaft pulley locknut.
1. Remove the following :
a) The rocker cover and its gasket (~,ofii~rr~s
/i//d Will, a rarb,,wt/or I.
b) The injection manifold and the racker-cover
(/,,<,I iU/<~CfPd r,zgir,rs 1.
2. Adiust the engine cold :
Inkt : 0.15 mm
With lb<‘ <wgir,<~ cold
i Exhaust : 0.20 mm
3. Fit the rocker cover and its gasket.
Tightening torque of fixing screws : 0.5 to 0.8 daNm
(3.5 tc. 6 ft.lbs ).
Fit the injection manifold f i/ nczvd br 1.
Lower the wheel to the ground,
and disengage the
gear.
r ACCEPTABLEMETHODS
I I
I. (< Rocking )> the valves :
(Inlet valve starting to open, and exhaust valve
I
closing) closing)
Bring No. 1 in <, rocking position /) adjust No. 4 Bring No. 1 in <, rocking position /) adjust No. 4
II II
No. 3” ” ” ” No. 3” ” ” ” No. 2 No. 2
0 0
No.4 I’ ” ” ” No.4 I’ ” ” ” No. 1 No. 1
” No.2 ” ” ” ” ” No.2 ” ” ” ” No. 3 No. 3
II. Exhaust valves fully open :
Valve to be opened
fully : Adjustment of rocker arm
CleUKUlCe
Exhaust valve No. 1
,, I, No. 3
,, ,, No. 4
,, ,, No. 2
If a rocker-rim noise persists after adjustment, proceed as follows :

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 120.0 : Chrrki,,~ the /iminp. Op. MA. 120-O 1
CHECKING THE TIMING.
lototing the crankshah :
) Vebirl~s /i/fed with a mantra~ gearbox :
Lift one of the front wheels of the vehicle, and
engage’ 4th or 5th gear so as to rotate the crank-
shaft,
by means of the raised wheel.
1) Vehicles /itted with n torqee ronrwrter :
Two methods are permissible to rotate the crank
shaft :
- feed the starter “iota from (I &volt battery,
or remove the protective plate under the
converter casing, and rotate the converter
using a screwdriver.
1. Remove :
spore wheel,
cylinder head (carburettor engine 1,
the injection manifold and the rocker cover
(fuel injection engine 1.
2. Bring piston of cylinder No. 4 to TDC. with the
valves in (( rocking position x
NOTE : The TDC mark on engine flywheel co”
be see” at point (( a )) on the clutch housing.
3. Adjust clearance of inlet valve ( 1 ) of No. 1
cylinder to
1.10 mm (theoretical clearance 1.
4. Turn crankshaft exactly one turn in direction of
rotation of engine f m/i-clockwise iro>t! /lyre hpel
side I.
5. Check clearance of inlet valve on cylinder No. 1.
This must be between 0.05
and 0.25 mm.
6. Check and adiust rocker-arm clearance
(engine cold )
Inlet .__....__.............................................,.,, 0.1 5 mm
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.20 mm

Downloaded from www.Manualslib.com manuals search engine OPEdATlON N- MA.IE. 144-00 : C1 3aractcJristics o/ the e L-Jetro~ic n elcctrorlir Op. MA.IE. 144-00 9
fuel injectian systwn. E.C.U; ( ELECTRONIC CONTROL UNIT )
Apart from three integrated circuits ( I.C. ) forming the main part of the E.C.U., there are in addition only a few
semi-conducting components condensers, calibrating resistors and filters so as to avoid.any interference.
I
The function of the E.C.U. is ,to supply an impulse to the injectors, and to control their opening for a precisely
defined amount of time. The E.C.U. to this effect uses the information provided by all the engine sensors which
translate the operating conditions of the engine into electric impulses.
All the injectors are connected in parallel, and inject fuel simultaneously twice for each rotation of the camshaft
( therefore,twice for each engine cycle ), injecting half the quantity of fuel required each time With this system
it is not necessary for the camshaft angle to coincide with the beginning of injection point, which eliminates the
need for a generating switch incorporated in the distributor.
The injection impulse control is ensured by the distributor impulses. The distributor produces four impulses for
every operational cycle. Since injection only occurs twice in every cycle, the E.C.U. must divide the frequency
by 2.
The impulses coming from the distriLti, are transformated into square waves by the waveform shaper. Since
injection only occurs twice for each camshaft rotation, whereas the distributor provides 4 impulses in the same
amount of time, the frequency of the impulses must be divided by 2 in the frequency divider.
These signals are used to charge a condenser. The condenser discharge determines the beginning of injection
point; the position of the air-flow sensor flap ( which determines the quantity of air drawn in ) being the main
parameter for calculating the duration of injection.
At the multiplying stage of the E.C.U., various correction values ( full load and idling speed via throttle butterfly
spindle switch, engine temperature via the water temperature sensor, air temperature via the air-temperature sensor
located in the air-flow sensor ) are combined with the signals from the air-flow sensor and the injt,ztion frequency
in order to determine the injection duration which is transmitted to the injectors by way of impulses.
The time it takes for the injector needle to open and close depends on the battery voltage.
As the supply voltage increases, the injection duration increases.
The fact that the quantity of fuel injected depends
on the voltage is cancelled out by the fact that the injection duration is inversely proportional to the voltaqq,in the
E.C.U.
The final impulse determines the time during which the injectors are connected to earth ( injection duration ‘supplied
by the output stage ).

Downloaded from www.Manualslib.com manuals search engine Op. MA.IE. 144-O 1 I - PRECAUTIONS TO BE TAKEN WHEN WORKII;(G ON A VEHICLE FITTED WITH THE (t L-JETRONIC n
SYSTEM.
1.
Do not run the engine if the battery leads are improperly secured
2. Do not use a quick-start charging trolley for starting the engine
3. Never disconnect the battery with the engine running
4. When charging the battery, disconnect the leads
5. Before checking the injection system, check the ignition : (advance, advance curve, proper grade of plugs 1
6. Remove the E C U before putting the vehicle through a paint-stoving oven
7. Check the conditions of the various connections
8. Never disconnect the E,C U. while the ignition is on
9. When checking compression, disconnect the positive terminal of the coil (in order to stop the injection signal). 10.
When carrying out a check requiring an ohmmeter, use exclusively a battery-powered ohmmeter. II. FAULT-FINDING.
1. THE ENGINE DOES NOT START, OR IS DIFFICULT TO START . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 2
2. THE ENGINE STARTS, THEN STOPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 3
3. UNSTABLE OR INCORRECT IDLING SPEED, EXCESSIVE FUEL CONSUMPTION ........................ P:5
-4. ENGINE MISFIRES AT .ALL SPEEDS ........................................................................................................
P. 7
5. LACK OF POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ P. 9

Downloaded from www.Manualslib.com manuals search engine 1. Energizing the system : ( DIAGRAM 1 )
_ Disconnect the E.C U
- Switch the ignition on
Using a voltmeter. ensure that each point in
dingrm 1 is effectively energised. after having tested the
earthing. If not, switch off the ignition. and test the circuit using a battery operated ohmmeter. With the
voltmeter connected between terminals ( 1 ) and ( 5) of the E. C.U., operate the starter the voltmeter must
register the ignition impulses If it does not. check the ignition
( ANNEXE A ).
2. Fuel pump feed ( on operating the starter ) ( DIAGRAM 2 )
- Disconnect the E C.U.
- Switch on the ignition
- On operating the starter. the fuel pump (
secureri rrt/rler the I c~hiclc’. uoor IIJO K. ti. ronr (, l~eol I must be
heard to operate by someone standing close by
If not switch off the ignition, and test the circuit using a battery operated ohmmeter.
The resistance between terminal (( 88 d H of the relay assembly ( c~r~tler 111~
L,H. honr/llor)~p ) and earth
must be 1 Q approx-
Make sure the petrol pump is properly earthed.

Downloaded from www.Manualslib.com manuals search engine f
E
E
a
a
2 DIAGRAM 1
I t
5 E 0
t-
DIAGRAM 2 /
-
t Battery +-----
0-1

Downloaded from www.Manualslib.com manuals search engine DIAGRAM 3
+ Battery
:------------ ____ -----_---------- -------- -A---\,
+fi ,c
i!J &J
/---I - 0
___,’
DIAGRAM 4

Downloaded from www.Manualslib.com manuals search engine Op. MA.IE 444-O 15
3. Fuel pump feed ( with engine running ) : ( DIAGRAM 3 )
- Disconnect the E.C.U.
- Disconnect from the air-flow sensor the air hose to the butterfly housing
- Switch on the ignition:
- Actuate the air-flow sensor flap by hand’ when the petrol pump contact closes the pump should be heard
working.
If not, test the circuit using a
battery operated ohmmeter, without forgetting to test between terminal G 36 ))
on the air-flow sensor and terminal H 20 .)) on the E.C.U. for continuity ( The 2nd terminal is not connected
to the E.C.U. ).
- The resistance between terminals (( 86 b H and G 85 )) on the relay box f //j/nor thc~ I~./I. h<~ntllnr~tp ) must be
between 52 and 78 12.
P 4. Supplementary air control ( DIAGRAM 4 )
4
c
5
6
- Disconnect the E.C.U.
-E
? - Check that the supplementary air control is properly connected ( arrow on the casing )~
In
If it is fitted the wrong way round. the port may be blocked.
- The resistance between terminals (( 34 1, and (( 48 )) on the- supplementary air control must be 50 Q approx-
- Visual checking the port on the supplementary air control must be open when the engine is cold, and closed
when the engine temperature is above 60” C
- With the engine cold. if the air pipe to the supplementary air control is flattened the engine rpm must decrease.
With the engine warm, if the air pipe is disconnected, the engine must accelerate.