1988 CITROEN CX starter motor

CHECKlNG THE TRANSISTORISED IGNITION
ELECTRO-MAGNETICALLY TRIGGERED TRANSISTORISED IGNITION
PRELIMINARY CHECKS:
Inspect:
- the connection of the different leads (in particular to coil: a bad connection can cause a high voltage drop preven-
ting the current from passing into the coil primary winding (I 5 A approx),
- condition of the leads : (circuits broken, short-circuits across screening, etc.),
- condition of the sparking plugs (deposits, cracks due to overtightening),
- condition of the distributor cap (wear, cracks) and the rotor arm (loose).
Disconnect the interference suppression capacitor and the diagnosis harness, from the circuit.
Carry out a ((spark test)) with the starter motor and one plug earthed.
IMPORTANT: The module may be destroyed if one of the secondary wires is too far from the earth. CHECKING THE COIL (3) (ignition module and supply to coil disconnected):
MEASUREMENT OF Ohmmeter placed between channels No. Reading (in 0)
Primary winding resistance 1 and 4 DUCELLIER 0.76 to 0.84
BOSCH 0.74 to 0.90
Secondary coil resistance 1 4 and HT coil contact DUCELLIER 5700 to 6300
or
BOSCH 7425 to 9075
Insulation 1 or 4 and earth 00
Checking the coil power supply using a lamp or a voltmeter:
- Switch on the ignition: there should be a 12V current between the “BAT” terminal of the coil and the earth
- Switch off ignition. CHECKING THE IGNITION MODULE (2):
The module is designed to function with the ignition distributor and the coil.
- Do not operate the module without cooling (aluminium plate heat sink) or ventilation
- Do not check the module with an ohmmeter since the results will be non-significant.
Checking the module power supply using a lamp or a voltmeter:
- Disconnect the module connector
- Switch on the ignition: there should be a 12 V current between the channel 4 of the connector and the earth.
- Switch off ignition.
The low voltage ignition circuit being connected (in working order), disconnect the coil - distributor HT lead on
the distributor side and connect it up to an earthed plug: by sending short pulses ( + 12 VI to channel 5 (red wire)
from the module, sparks should occur at the plug (simulation of distributor spark current). CHECKING THE IGNITION DISTRIBUTOR (1):
Test the impulse generator with the module connector disconnected. MEASUREMENT OF:
Resistance
Earth
Insulation Ohmmeter placed between channels No. 5 and 6
2 and engine earth
5 and 2 then 5 and 3 Readings (in Q) 950 to 1250 approx.
0
m
,

CHECKING THE INTEGRATED ELECTRONlC
IGNITION (I.E.I.)
TEST PROCEDURE USING CONVENTIONAL EQUIPMENT
on the CX 2500 vehicle with M 25/659 type engine
l Checking the voltage in the secondary winding of each coil
0 Operating procedure: Disconnect one sparking plug and bring the end of the released wire 1 cm approx
from the crankcase. (Repeat the operation for each set of cylinders).
l Operate the starter motor:
if a spark occurs The incident is not to be attributed to the I.E.I.
Check the injection system, the valve timing, the rockers etc.
- examine the engine sparking plugs.
- inspect the circuit between the I.E.I. control unit white terminal 1 and the fuel
injection control unit terminal 15 for continuity: read 0 0, the connectors from
the control units being disconnected.
if no spark occurs The incident is due to the ignition system--ccarry on to next tests.
l Working on the primary winding of each coil
Operating procedure: Connect a 12V warning lamp of the Wedge base type between the negative and
0 the positive terminals of the coil (i.e. between terminals 1 and 3, connectors con-
netted to coil).
l Operate the starter motor:
if no regular breaks occur incident in the coil primary winding
or
incident in the E.C.U. control circuit.
if regular breaks occur incident in the secondary winding
The following checks are to be carried out with I.E.I. and fuel injection control units connectors disconnected.
l Checking the coil primary windings:
Operating procedure: Measure the resistance between terminals 1 and 9 of the I.E.I. control unit black
0 connector: Read = 2.5 0.
Warning: the ignition should be switched off.
If the reading is incorrect, investigate for a failure in this circuit.
l Checking the E.C.U. pick up sensors:
co Operating procedure: Measure the resistance between terminals 5 and 12 then 6 and 13 of the I.E.I.
control unit black connector: Read = 50 a.
l Checking the feed for the E.C.U. and earth connection, with ignition switched on
Operating procedure: Measure the voltage between terminals IO (white connector) and 2 (black con-
nector) of the I.E.I. computer: Read the battery voltage.
The same check should be carried out between terminals 2 (earth) and 11 of the black connector:
ignition switched on, starter motor operated, read the voltage.
69 l Check that the distance between the datum sensor and the flywheel ring is 1 mm + 0.5.
0 l Incident on the ignition circuit secondary winding: make sure that the resistance of each coil
winding is: 350014000 a.
8531

CHECKING THE I.E.I.
TEST PROCEDURE USING CONVENTIONAL EQUIPMENT
on the CX 2500 Turbo vehicle with M 25/662 type engine
0 Checking the voltage in the secondary winding of each coil
0 Operating procedure: Disconnect one sparking plug and bring the end of the released wire 1 cm approx
from the crankcase. (Repeat the operation for each set of cylinders).
0 Operate the starter motor,
if a spark occurs
if no spark occurs The incident is not to be attributed to the I.E.I.
Check the injection system, the valve timing, the rockers etc.
- examine the engine sparking plugs.
- inspect the circuit between the I.E.I. control unit white terminal 1 and the fuel
injection control unit terminal 15 for continuity: read 0 Q, the connectors from
the control units being disconnected.
The incident is due to the ignition system-carry on to next tests.
l Working on the primary winding of each coil
Operating procedure: Connect a 12V warning lamp of the Wedge base type between the negative and
the positive terminals of the coil (i.e. between terminals 1 and 3, connectors con-
netted to coil).
l Operate the starter motor,
if no regular breaks occur incident in the coil primary winding
or
incident in the E.C.U. control circuit.
if regular breaks occur incident in the secondary winding
The following checks are to be carried out with I.E.I. and fuel injection control units connectors disconnected.
0 Checking the coil primary windings:
Operating procedure: Measure the resistance between terminals 1 and 9 of the I.E.I. control unit black
0 connector: Read = 2.5 Q.
Warning: the ignition should be switched off.
If the reading is incorrect, investigate for a failure in this circuit.
l Checking the E.C.U. pick up sensors:
OI Operating procedure: Measure the resistance between terminals 5 and 12 then 6 and 13 of the I.E.I.
4
control unit black connector: Read 2: 5OQ
0 Checking the feed for the E.C.U. and earth connection, with ignition switched on.
d 5 Operating procedure: Measure the voltage between terminals 10 (white connector) and 2 (black con-
nectar) of the I.E.I. computer: Read the battery voltage.
The same check should be carried out between terminals 2 (earth) and 11 of the black connector:
ignition switched on, starter motor operated, read the voltage.
@ 0 Check that the distance between the datum sensor and the flywheel ring is 1 mm + 0.5.
0 * Incident on the ignition circuit secondary winding: make sure that the resistance of each coil
winding is: 350014OOOQ.

2 MA
510.00/1 ELECTRICAL JUNCTION BOX
Colour Colour
CJ)
”
2
a,
E --Pi- Function ”
i
-1
5 z 2 iz az?i”; cg Function
,%“~o” -0
2% z 2:
om 02’ 2%
Es p 2 f
“v)Z”” i53 s 22
S2r”~S 0% zi ‘i’ F
G,c
125M 1JM Earth 106-201 211
III 5 3 Bl 1 J Mv + lgnttron 40
On Harness 3 J 2 v L/H Front Srde Lamp 201
2 V Mv
G + lgnrtion Swatch 38
Main Beam 212 3V B Tachometer 66
4G V Dipped Beam
G 213
5 V BI L/H Drrectron lndrcator 107
III 6 6 B 1 J Mv + lgnrtron Swatch - Heater 20
l35B 1G 2J G + lgnrtron Switch - Heater 27
Drpped Beam 214
3
2J G Marn Beam 215
H 4
D 3 v R/H Side Lamp 202
4 J M 5J R
Earth Heater Eart; 24
11 I-203 216
5 V BI 6 J BI Heater Earth 31
R/H Direction lndrcator 112
I408 1 Heated Rear Screen IV 1 0 J 1 BI
162 Main Beam 215
2 2 Heated Rear Screen 2 J V
163 Dipped Beam 213
3 s Boot Lighting 3 G
188 Rear Fog Lamp Swatch
208
4 Side Lamps 4G N
217 + Directron Indicator Swatch 108
5 5
Rear No Plate Lamps 219
B 5 G BI L/H Drrection lndrcator I 109
R 6 2
Stop Lamps 6 G M Earth
147 I105
E 7G R Side Lamps
7 3 L/H DIrectron lndrcator 109 211
8 L? R/H Drrectron Indicator 8G B
110 R/H Directron lndrcator 110
9 t” Reversing Lamps 33 9 J N + Direct Lrghtrng 201
0 Rear Fog Lamps 208 0 BI N + Drrect Lrghting 201
IllOM 1 IV24M 1 + Battery lgnttron Switch 138
2J G Marn Beam 216 2 + Battery lgnrtron Swatch 27
3 3 + Battery lgnttion Switch 5
4 * 4 + Battery - lgnitron Swatch 38
56 R Side Lamps 211 .
B 6 IV31N 1 Heated Rear Screen
7M V Hand Brake 90 I.
8 N + Ignition Switch 79 IV46J 1 J R Windscreen Wiper Fast Speed 133
9V N + Direct 68 2 J Mv Wrndsc Wtper t lgnrt Swatch 138
0 V BI Tachometer 65 3 G Mv Windscreen Washer Pump
B 138
4 J BI Wrndscreen Wiper Slow Speed 134
II288 1 Side Lamp 204 5G v Windscreen Wiper Parkrng 136
2 B G Hazard Warning Switch 111 .6 G J Windscreen Wiper Timer 135
3B N + Drrect 110 .
B 4 B BI L/H Direction Indicator 111
IV 5 7 B 1 G Mv Windscreen Washer Pump 138
5 6 Mv + lgnitron Switch 111
2 G M Earth 6-80 138
6B J + Drrection Indicator Unit 107
3J G Earth
7 0 160
R/H Direction Indicator 112
G 4 M Cooling Fan Relay 6 a M Earth 113
5G B Horn 159
6 BI Cooling Fan 7
ll32B 1 V Cigar Lrghter Lighting 203 7V J
H 2 + lgnitron Cooling Fan Relay 6
II43M 1 J V13J 1
Earth 94
2 J 2 B V Horn
Earth 93
B 159
MB 3 B M
3 J Earth + Horn
92 159
II538 1 V J Rear View Mtrror De-lcrng V 2 4 BI 1 BI
158 Rear Window Motor
116
2v B Heated Rear Screen Switch 2J V
162 Height Corrector Earth 141
H H 3 V Mv + Ignition Switch 3J N + Drrect height Corrector 144
4J B + lgnrtron herght Corrector 139
(Heated Rear Screen) 162
lll12M 1 J Earth 204 189 V32N IN + Battery Junction Box 2
H J N + Crgar Lighter 90 G N + Battery Junctron Box 2
Ill 2 6 M 1 G N + Stop Lamp Switch 147 V45J 1 J R Wrndscreen Wrper Fast Speed 133
2 G M Earth 90 2 J BI Windscreen Wiper Slow Speed 134
3
D 3 G B Windscreen Wrper Parking 136
H 4V R + Glove Box Lrghting 187 4J N + lgnitron Windscreen Wiper 137
5 G Stop Lamp Switch 147 5 J Earth Windscreen Wiper 134
6 V Hand Brake Swatch 90
V54J IJ R Starter Solenord 5
III 3 2 N 1 V R + Direct Radro 191 2 G Bi Reversrng Lamps 33
H 2 ( + lgnrtion Swrtchl G 3 G + lgnrtron Swatch After Fl 34
4G R + lgnrtron Swatch Rev Switch 33
lll44B 1 lgnttron Swatch + C iF3) 138 -
2 lgnrtron Switch + C tF2) 27 V 6 3 R 1 BI N Rear Wrndow Motor 128
3 Starter Swatch 5
H 2G R t Direct After F7 179
4 lgnrtion Switch -t C lgnrtron 38 3J M + Dtrect Rear Crgar Lrgther 139

2 MA LOCATION OF THE ELECTRONIC CONTROL
510.00/3
UNITS AND RELAYS (All Models)
POSITIONING OF THE ELECTRONIC CONTROL UNITS AND RELAYS
No. Description Location
54 ABS Control Unit G
57 Fuel Calculator Unit A
60 Air Conditioning Control Unit A
76 Window Winder Unit F
80 Speed Regulating Unit E 81
Heater Control Unit A
84 Water Level Unit L
87 Water Temperature Unit B
89 Door Locking Warning Unit A
90 Door Lock Control Unit A 91
Remote Control door Lock Unit C
92 Interior Lighting Timer A
93 Bulb Failure Indicator Unit (Salopn) H
93 Bulb Failure Indicator Unit (Safari) J 110
Heater Plug Control Unit
,. K 127
Side lamp Audible Warning D 141
Ignition ECU K 142
Injection ECU E 151
Water temperature Flasher unit B 658
Blower Speed Control Unit E 731
Fuel Injection electronic Relay M 733
Air Cond. Engine Fan Relay K 734
Injector relay M 735
Main Beam Relay D
739 Height Control relay B 743
Air Horn Compressor Relay K 745
Blower Motor Fast Speed Relay A 750
Fog Lamp Relay
6 756
ABS Electra-Valve Relay L 757
ABS Protection Relay L 772
Blower Fan Motor 2nd Speed Relay K 773
Engine Cooling Fan lnverter Relay K 775
Starter Motor Safety Relay (Auto G/Box) B 778
Fuel Heater/Starter Motor Relay (with diode) K
779 Fuel Heater Oil pressure Relay (with diode) K 781
Main fuel Heater Relay K RI
Engine Cooling Fan Relay B R2
Front Window Winder Relay 6 R3
Rear Window Winder Relay B R4
Heated Rear Screen Relay 6 I
Windscreen Wiper Timer Relay
B
C Direction Indicator Unit B

ARRANGEMENT OF THE ELECTRICAL INSTALLATION
q @ CX22TRS 7/85-t 1 MA 5 510.00110
3EF. DESCRIPTION LOCATION
Circuit Wiring CONNECTOR
Number HARNESS
Channel-colour (or urilt)
1 Front cigar ljghter & lighting 137-151
i5 38-l v H
5 Ignition distributor 30 to 34 3N 2
10 Alternator 51 to 54 b6 IN + Ilc CA & M
25 A & B Horn 107 - 108 c7 1N + 1N A
45 Battery 1
b8 IN + IN CP & CN
46 Instrument panel 36 to 73 159 to 162 g6 * T
50 Ignition coil 30-3 1 IN + Ilc G
75 Ignition module 30 to 32 7N Z
81 Interior heating control unit 21 to 24 h5 8N K
84 Coolant level indicator unit 41 to 43 e4 5B D
89 Door locking indicator lamp unit 131-132
i5 5N H
90 Door locking control unit 124 to 134 15 9v H
91 Remote control door locking unit “PLIP” 120 to 122 n5 8N P
92 Interior lamp timer 117 to 122 15 7M H
93 Bulb failure detection unit
27, 46 to 48, 74-75, 104-I 65 S8 38 + 68 & 6J L & w
95 Junction/Fuse box
127 Side lamp audible warning 1222123 g8
g6 5+N‘” ;
130 TDC sensor 28 3M
170 Boot light switch 136 s6 IM E
174 Boot door locking switch 126 t5 2M C
180 Reversing lamp switch 27 d6 1N + 1V G
185 Stop lamp switch 104 h6 IN + IM H
190 Hand brake switch 55 k5 2M H
!25 Carburettor choke switch 49 IG B
!29 Ignition switch 4-30, 44-95 h7 4M + 48 (95)
!30 L/H Front door switch *
119 f9 IM H
!31 R/H Front door switch 120 fl 1M H
!32 L/H rear door switch 122
k9 IM H
!33 R/H Rear door switch 123 kl IM H
!34 Glove box switch 135 f3 1 Ic+ 1 Ic H
!35 Hydraulic fluid low pressure switch 46 e6 IM G
!36 Hydraulic fluid level switch 45 e8 1 Ic + IM G
!37 Coolant low level switch 41-42 e3 3R D
!38 R/H Front door lock switch 64
jl 28 H
!39 L/H Front door lock switch 63 P
28 H
!41 R/H Rear door lock switch 66 (71 28 PD !42 L/H rear door lock switch 65 qg 28 PG
!43 Boot door lock switch 67 c5 2M C
!44 Bonnet lock switch 62 a5 2M V
!51 Height control switch 96 to 100
j5 2M & 4M H & (608) !54 Lighting/Direction indicator switch 72 to 75. 57 to 163 97 58 4M 3M T
!55 Windscreen wiper/Washer & Horn switch 90 to 95, 107 g6 48 5B 28 T
!68 Air recycling switch 15 to 17
h5 4J Q
!71 Air distribution switch 12 to 14 h5 4M Q !78 Blower motor speed control 18 to 20 h6 38 Q
!79 Heater control & Lighting 23 to 25-68 h4 58 K
100 Starter motor 2 to 4 b5 IN & IR CP 165 Ashtray lighting 152 if5 2B H
I70 Boot lighting 136 s4 1N & llc F
I75 Glove box lighting 135 f4 IN & 1M H I80 Engine compartment lighting 150 c6 IN EC
I85 L/H rear number plate lighting 166 t6 Ilc + IM E 186 R/H rear number plate lighting 167 t4 Ilc + IM E
190 Steering lock lighting 156 97 Ilc + IIC T
L20 Carburettor idle cut-out solenoid 25 IN M L30 L/H front brake caliper 48-49 d9 2N + IN U(g.) I31 R/H front brake caliper 50-51 dl 2N + IN U(d.!
L40 L/H front side lamp 149 a8 2M G
141 R/H front side lamp 151 a2 2M D 142 L/H rear lamp 165 L43 R/H rear lamp 166 I45 L/H rear lamp cluster t8 6G F
146 R/H rear lamp cluster t2 6G F
157 L/H stop lamp 104
* Particular Specification
8531-8532

10 MA ARRANGEMENT OF THE ELECTRICAL INSTALLATION
510.00/11
CX
25 GTI 7185 -+
REP. DESCRIPTION LOCATION CONNECTOR
Number HARNESS
Crrcuit Wiring Channel-colour (or unrt)
238 R/H front door lock switch 99
JI 2B H
239
L/H front door lock switch 98
j8 2B H
241 R/H rear door lock switch 101
ql 28 PD
242 L/H rear door lock switch 100
99 28 PG
243 Boot door lock switch 102 t5 2M C
244 Bonnet lock switch 97 a5 ,2M v
251 Height control switch 131-135
j5 2M & 4M H & 608
254 Lighting/direction indicator switch
107 to IIO- 192 to 198
97 5B-4M-3M T
255 Windscreen wiper/washer & horn switch 125 to 129-142
96 2B-4B-5B T
271 Air distribution switch 19 to 21 h5 4M \Q
278 Blower motor speed control rheostat 23 to 25 h6 2B ;1
279 Heater control & lighting
29 to 31-103-104 h4 58 K
280 Supplementary air control (injection) 38 b6 2N IM
285 Ignition suppressors (radio) 59 & 60 b6 2xlN 2
295
Air horn compressor 143
c7 IMV-IN A
300
Starter motor t
3 to 5 b5 IN-IR & IN CP & CA
302 Flowmeter 42 to 44 b2 5N IC
545 Fast idling electrovalve (air con option) 14 d2 *. 2xlV V
$65 Ashtray lighting 187 1’3 2B H
$70 Boot lighting 171 s4 IN-TIC F
i75 Glove box lighting 170 f4 lN-IM H
I80 Engine compartment lighting 185 c6 IN EC
385 L/H rear No. plate lighting 211 t6 IM-llc E
386 R/H rear No. plate lighting 212 t4 IM-llc
E
390 Steering lock lighting 191
97 2xllc T
$10 Air con compressor clutch 13
c6 IN V
$30 L/H front brake caliper 83-84 d9 2N& IN U
$31 R/H front brake caliper 85-86 dl 2N& IN U
140 L/H front side lamp 184 a8 2M G
F41 R/H front side lamp 186 a2 2M D
L42 L/H rear side lamp 200
c43
R/H rear side lamp 201
145
L/H rear lamp cluster t8 6G F
C46 R/H rear lamp cluster t2 6G F
L57 L/H stop lamp 139
158 R/H stop lamp 140
160
L/H rear fog lamp 191
1-61 R/H rear fog lamp 192
.62 L/H reversing lamp 33