Wheel CITROEN CX 1988 Owner's Manual

CHECKING THE IGNITION SYSTEM
USING CHECKING EQUIPMENT OUT 106 029T
The instrument can be utilised on CX 2400 I.E. with naturally aspirated engine and CX 2500 I.E. TURBO. Howe-
ver, on CX 2400 I.E. having an integrated electronic ignition system with a single connector E.C.U., it is neces-
sary to proceed as follows:
- connect the I.E.I. control unit to the black connector of OUT 105 029.T
- set the switch of the apparatus to the “1 connector” position
- I.E.I. with 1 or 2 sensors can be checked with this device.
a) Testing the ignition coil primary winding:
- The warning lamps, one at each coil, blink rythmically with the impulses transmitted to their primary win-
ding. Steady blinks indicate that there is enough current to generate a spark in the secondary winding.
- The switch situated under the warning lamps makes it possible for the primary windings of both coils to
be insulated, by pushing, in the “out of circuit“ position, any interference coming from the HT circuit when
the frequency of illumination for sensor warning lamps is checked.
- If the warning lamps blinking is correct, the failure may be caused by:
- the ignition information to the fuel injection control unit, (paragraph c),
- the secondary winding (coil wires, coils),
- any other item required for a correct operation of the engine such as injection, valve gear, rockers etc.) -
If the warning lamps blinking is not correct, examine the control unit warning lamps, (paragraph b),
b) Testing the sensors: -
The warning lamp connected with the “datum” sensor blinks rythmically with the impulses transmitted by
the peg, i.e. one blink per engine revolution, (2 sensors fitted).
- The warning lamp connected with the “flywheel pick up” sensor, blinks rythmically with the impulses sent ’
by the flywheel teeth.
The frequency of the flashes is such as they can hardly be seen.
Apparently, the lamp stays on, (1 or 2 sensors fitted).
On the CX 2400 I.E. and 2500 I.E. with normally aspirated engine, the vacuum pressure warning lamp lights
up momentarily after a sharp acceleration: this warning lamp is no longer usable on the CX 2500 I.E. with
turbocharger.
c) Tests related with the I.E.I. control unit:
E.C.U. functions: -
The rev. counter warning lamp blinks rythmically with the impulses transmitted to the rev. counter.
- The injection warning lamp blinks rythmically with the impulses sent to the fuel injection control unit
+k 8531

CHECKING THE IGNlTlON ADVANCE
of the I.E.I. system
On CX vehicles fitted with I.E.I.
These vehicles having fixed sensors, are not equipped with TDC sensors
I) Marking the TDC:
Draw a mark on the crankcase, in the opening located next to the flywheel pick up sensor
- Remove the 1st or 4th cylinder sparking plug
- Finding the T.D.C. with a locating peg: jack up the vehicle on one side and engage a gear.
Rotate the road wheel in one direction.
Mark down the place where locating pin will enter the flywheel.
Draw a temporary line on the flywheel ring. Rotate the lifted road wheel in the opposite direction, with
the pin still engaged. Mark the position of the pin in the flywheel ring. Take an average of these two marks-
which corresponds to the TDC. Draw a white paint mark on the flywheel ring, opposite the one on the
crankcase.
- Refit the sparking plug.
2) Testing the development of the speedometer advance curve:
- Connect a phase shifting strobe lamp
- Set the strobe lamp to the 2 cyl. u stroke or 1 cyl. 2 stroke position.
- Disconnect the pipe of the load correction depression operated capsule from the inlet manifold. Blank
off the orifice.
- Run the engine and check the advance curve development.
3) Testing the operation of the air-operated capsule on normally aspirated engines:
- Blank off the vacuum capsule venting orifice.
- Connect a vacuum pump to the capsule pipe.
- Run the engine to 2.000 rpm; record the advance reading.
- Create a 400 mbar depression in the vacuum capsule.
The ignition advance increases by about 15’ and the engine accelerates to 200 rpm approx.
On turbocharged engines:
- Connect a vacuum-pressure pump to the capsule pipe.
- Rotate the engine to 200 rpm. Read the advance.
- Build up a 500 mbar depression in the capsule:
- There will be a 22” increase of the ignition advance, approx. and about a 500 rpm engine acceleration.
- Build up a 500 mbar pressure in the capsule:
- There will be a -1 1 o decrease of the ignition advance, approx. and about a 500 rpm engine slowing down
- Pinking: occurs when the engine speed exceeds 1.000 rpm. The warning lamp should light up in the
following cases:
- anti-knock sensor system broken or short-circuited,
- knock sensor broken or short circuited,
- improper earthing provided by the knock sensor.
- Check the operation with the strobe lamp, and a 2.000 rpm engine speed Record the ignition timing.
- Disconnect the knock sensor:
The ignition advance decreases by IO’ approx.

2 IVIA
422.1/l OVING AND REFITTING A REAR AXLE ARM
REMOVAL
Raise the rear of the vehicle and support it on stands,
wheels free.
Remove the road wheel.
Release the pressure in the hydraulic systems.
Remove protection plate (I 1, Fig. I.
Vehicle having the A.B.S. fitted, Fig. II :
Withdraw sensor (3) and push aside the metal panel
and sensor, liberating the electrical harness from the
retaining clips.
Remove suspension cylinder (5), Fig. Ill.
(As explained in @ MA 433. l/2/.
Take off fixing lug (41, Fig. Ill.
Uncouple:
- brake hose (21, Fig. I,
- the anti-roll bar, Fig. Ill. In order to do so, extract
screws (6) and (7) and keep adjustment shims and
washers c(a)) and ccbal.
Take off nut (8) 24 mm A/F, Fig. IV.
Free the shaft and remove the arm. REFITTING
Position the axle arm (the thinner thrust cup (9) :
9.34 mm thick at CCCH facing the interior of the
vehicle, -+ l/87), Fig. V).
l/87 -+ the thrust cups are identical and the adjust-
ment is effected by means of shims facing the exte-
rior of the vehicle.
Return the shaft to its original location.
Place nut (8), new NYSLTOP nul, Fig. IV.
Tighten to 13 mdaN.
Recouple the anti-roll bar, Fig. Ill. Add the screws (6)
and (7) together with the adjustment shims and
washers found at c(a)) and c(b)) on dismantling.
Tighten screws (7) to 6 mdaN and (6) to 10 mdaN.
Reconnect brake hose (2) Fig. I, fitted with a NEW
sleeve seal. Tighten it.
Refit fixing lug (41, Fig. Ill.
Locate suspension cylinder (51, Fig. IV.
(See @ MA 433. l/2/.
ABS vehicle, Fig. II :
Refit sensor (31, (grease the outside of the sensor with
MOBIL TEMP No. I).
Tighten the screw to 1 mdaN.
Reassemble:
- protection plate (I 1, Fig. I,
- the road wheel.
Lower the vehicle to the ground.

FRONT MA
412.1/l 1
RECOMMENDED TOOLS
6303-T.
Upper arm shaft extractor. 6320-T.
Anti-roll bar link rod extractor 6602-T.
Set of three stands.
REMOVING AND REFITTING
AN UPPER WHEEL ARM
8531-8532

REMOVING AND REFITTING
AN UPPER WHEEL ARM
REMOVAL
Raise and support the front of the vehicle on stands
6602-T.
Depressurize the hydraulic circuit.
Set the height control lever to the (( low )) position
Remove, Fig. I :
- the wheel,
- the suspension cylinder pivot retaining pin (I 1,
- the anti-roll bar link rod nut (2).
Uncouple ball-joint (3) from the anti-roll bar link rod
using puller 6320-T. Fig. II.
Screw up the tool nut in the ball-joint stem. Fit the
tool cross piece and pin.
Extract, Fig. Ill,
- the nut from upper ball-joint (4).
Disconnect the upper ball-joint.
NOTE:
If the vehicle is fitted with the ABS, the removal of
the upper ball-joint nut requires pushing back the
transmission.
Remove:
- the pin, C
- the nut lock,
- the drive-shaft nut.
Fig. IV
- nut (51,
Fig. V
- the spindle with extractor 6303-T.
Remark: An adjustment shim may be found between
the arm and the front face of the subframe. REFITTING
The LH wheel arm is different from the RH one. Boss
u a )a should be directed towards the rear of the
vehicle when the wheel arm has been fitted.
Reinstall, Fig. V :
- the arm fitted with its thrust cups (7)
frhe thinner cup facing rearwardsl,
- the adjustment shim (6) found on dismantling, facing
forward.
Engage the spindle ; place a new NYLSTOP nut.
Tighten to 12.5 mdaN
Recouple the upper ball-joint.
Tighten the new NYLSTOP nut to 7 mdaN
Reconnect the anti-roll bar link rod (wipe the ball-joint
fixing but do nor use solventl.
Tighten the new NYLSTOP nut to 4.7 mdaN
Refit the suspension cylinder pivot and pin.
Vehicles equipped with the ABS:
Fit the drive-shaft nut (with the faces and threads
lubricated).
Tighten to 37.5 mdaN.
Replace:
- the nut lock,
- the pin,
- the road wheel

TOOLS TO BE USED
1671-T
3312-T
or 6323-T
6306-T
6312-T
6602-T
Inertia extractor
Lower wheel arm ball-joint extractor
with bosses.
Lower arm ball-joint extractor
with or without bosses.
Adaptor.
Expandable element to secure the lower
wheel arm fluid blocks.
Set of three stands
REMOVING AND REFITTING
A LOWER WHEEL ARM
8531-8532

REMOVING AND REFITTING
REMOVAL
Support the front of the vehicle on stands 6602-T.
Release the pressure in the hydraulic system.
Set the height control lever to the (( low )) position.
Withdraw:
- the road wheel,
- the brake pad wear warning lamp harness holding
clips,
- the lower ball-joint nut.
Uncouple the lower ball-joint from the arm using puller
3312-T or 6323-T, Fig. I
Take off:
- the plastic trim cover,
- nut (I 1, Fig. II,
- spindle (2) with the help of inertia extractor
1671-T and adaptor 6306-T, Fig. Ill.
Mark adjustment shims (3) and (4) location, Fig. IV.
Remove the wheel arm. REFITTING
Note: the RH and LH arms are not alike.
If the wheel arm has been removed following an
impact, it will be necessary to readjust the caster
angle.
Place the expander of tool 6312-T in the wheel arm,
with screw A pointing rearwards, Fig V.
Bring tubes (5) and (6) into contact, Fig. V. In order
to do so:
Fig. VI :
- Grip the arm in a vice,
- Tighten the expandable element by means of
spanner B from tool 6312-T.

REMOVING AND REFITTING
A LOWER WHEEL ARM
Refit
Insert
Loosen
Drift out
Tighten
Reconnect
Tighten
Reinstall Fig. I
the arm together with its adjustment shims
(7 1 and (2) placed in the position they were
found on dismanting.
spindle (31, Fig. II
expander A with tool 6312-T spanner B.
the assembly via shaft (3)
the new NYLSTOP nut (4) to 14.5 mdaN,
Fig Ill.
the lower ball-joint to the arm hvipe the
ball-joint fixing but do not use solvent).
the new NYLSTOP nut to 6 mdaN.
- the brake pad wear warning lamp harness
securing clips,
- the road wheel.
Lower the vehicle to the ground
Jfc 8531-8532

REMOVlNG AND REFlTTlNG A SWIVEL
REMOVAL
Support the front of the vehicle on stands.
Depressurize the hydraulic systems.
Remove:
- the road wheel,
- the pin,
- the nut lock,
- the nut (35 mm A/F)
Lock the wheel hub with tool. 6316-T, Fig. I.
Fig. II :
- nut (1) and its washer ; disengage the bail-joint from
the swivel,
- lock nut (6),
- nut (5).
Uncouple, Fig. II and Ill :
- cable (2) from the control lever,
- spring (31,
- cup (41,
- connection (7).
Take off, Fig. Ill, nut (8) together with its washer.
Liberate flexible pipe (9) from its fixing bracket,
Fig. Ill. ABS vehicles, Fig. IV
Extract the screw (I 0) securing the sensor.
Disconnect the brake pad wear warning lamp
harness.
Withdraw:
- the brake disc cooling plate,
- the harness screw and fixing bracket; release the
harness.
Remove the lower ball-joint nut.
Uncouple the swivel lower ball-joint using extractor
3312 T or 6323 T, Fig. V,
(avoid damage to the ball-joint protection rubber).
Pull out the drive-shaft.
Take off nut (I I) from the upper ball-joint, Fig. VI.
Uncouple the upper ball-joint.
Remove the swivel.

REMOVING AND REFITTING A SWIVEL
REFITTING Replace, Fig. IV:
Wipe the ball-joint fixings and location, do not use - flexible pipe (I I) into its fixing bracket,
solvent. - washer (I 0).
Recouple the upper ball-joint with the swivel. Tighten nut (9) to 2.2 mdaN.
Refit, Fig. I: Recouple:
- washer (I),
- Fig. IV, connection (I 2) provided with a new sea/.
- nut (2).
- Fig. V, the steering ball-joint.
Tighten to 7 mdaN (New NYLSTOP nut).
Refit:
Introduce the drive-shaft end into the wheel hub - washer (I 31,
(lubricate the hub seal lips). - nut (14) (New NYLSTOP one).
Couple up the lower ball-joint. Tighten to 6 mdaN.
Tighten to 6 mdaN the new NYLSTOP nut. Reconnect:
-cup (171,
Reconnect the brake pad wear warning lamp harness. - spring (I 61,
-cable (15).
Refit, Fig. II and Ill:
Adjust the handbrake (as indicated in @ 454.011).
- electrical harness fixing bracket (4).
- earth lead (5).
- screw (3). Put the drive-shaft nut into place.
- metal panel (6). (Faces and threads lubricated).
Lock the hub, utilizing tool 6310-T Fig. VI.
ABS vehicles, Fig. Ill:
Tighten to 37.5 mdaN.
Reinstall sensor (7) (spread MOB/L TEMP No. 1
grease over the outside of the sensor.
Bleed the front brakes (see @ 453.0/l/.
Tighten screw (8) to 1 mdaN.
Fit the wheel.
Lower the vehicle to the ground.
8531-8532