1.6l diesel engine with start/stop system , CAYC,(7MG)
From June 2011
León
Current Flow Diagram
No.
140 /
2
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Battery, Starter, Alternator, Battery monitor control unit
A
-
Battery
B
-
Starter
C
-
Alternator
C1
-
Voltage regulator
J367
-
Battery monitor control unit
J519
-
Onboard supply control unit
SA1
-
Fuse 1 in fuse holder A, on left in engine compartment (low box)
SA5
-
Fuse 5 in fuse holder A, on left in engine compartment (low box)
T2ag
-
2-pin connector
T2ah
-
2-pin connector
T2c
-
2-pin connector, near starter (only models with no air conditioning system)
T4t
-
4-pin connector, near starter (only models with air conditioning system)
T52a
-
52-pin connector
1
-
Earth strap, battery - body
507
-
Threaded connection (30), on battery fuse holder
652
-
Earth point, engine and gearbox earth
673
-
Earth point 3, on front of left longitudinal member
B316
-
Positive connection 2 (30a) in main wiring harness
B698
-
Connection 3 (LIN bus) in main wiring harness
León
Current Flow Diagram
No.
140 /
3
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Ignition/starter switch, Cruise control system switch, Cruise control system (CCS) SET button, Steering column electronics control unit
D
-
Ignition/starter switch
E45
-
Cruise control system switch
E227
-
Cruise control system (CCS) SET button
J519
-
Onboard supply control unit
J527
-
Steering column electronics control unit
T6ap
-
6-pin connector
T8r
-
8-pin connector
T16d
-
16-pin connector
T52c
-
52-pin connector
43
-
Earth point, lower part of right A-pillar
332
-
Earth connection 4, in dash panel wiring harness
371
-
Earth connection 6, in main wiring harness
382
-
Earth connection 17, in main wiring harness
507
-
Threaded connection (30), on battery fuse holder
605
-
Earth point, on top end of steering column
A2
-
Positive connection (15), in dash panel wiring harness
*
-
Only left-hand drive models
León
Current Flow Diagram
No.
140 /
4
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Terminal 30 voltage supply relay, Steering column electronics control unit, Fuse holder B
J317
-
Terminal 30 voltage supply relay, on left in engine compartment (low box)
J519
-
Onboard supply control unit
J527
-
Steering column electronics control unit
SB
-
Fuse holder B, on left in engine compartment (low box)
SB1
-
Fuse 1 on fuse holder B
SB2
-
Fuse 2 on fuse holder B
SB3
-
Fuse 3 on fuse holder B
SB4
-
Fuse 4 on fuse holder B
SB5
-
Fuse 5 on fuse holder B
T16d
-
16-pin connector
T40a
-
40-pin connector
507
-
Threaded connection (30), on battery fuse holder
B441
-
Connection (CCS), in main wiring harness
León
Current Flow Diagram
No.
140 /
5
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Fuel gauge sender, Fuel system pressurisation pump, Fuel pump relay, Intake manifold preheating relay, Fuse holder B
G
-
Fuel gauge sender
G6
-
Fuel system pressurisation pump
J17
-
Fuel pump relay, on relay carrier, on left of dash panel
J81
-
Intake manifold preheating relay
J519
-
Onboard supply control unit
SB
-
Fuse holder B, on left in engine compartment (low box)
SB6
-
Fuse 6 on fuse holder B
SB7
-
Fuse 7 on fuse holder B
SB8
-
Fuse 8 on fuse holder B
SB10
-
Fuse 10 on fuse holder B
SB13
-
Fuse 13 on fuse holder B
SB14
-
Fuse 14 on fuse holder B
SB15
-
Fuse 15 on fuse holder B
T5a
-
5-pin connector
T10e
-
10-pin connector
T40a
-
40-pin connector
78
-
Earth point, lower part of right B-pillar
369
-
Earth connection 4, in main wiring harness
A193
-
Connection (87a), in dash panel wiring harness
D104
-
Positive connection 2 (30a), in engine compartment wiring harness
D183
-
Connection 4 (87a), in engine compartment wiring harness
León
Current Flow Diagram
No.
140 /
6
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Fuse holder B
J519
-
Onboard supply control unit
SB
-
Fuse holder B, on left in engine compartment (low box)
SB16
-
Fuse 16 on fuse holder B
SB17
-
Fuse 17 on fuse holder B
SB18
-
Fuse 18 on fuse holder B
SB19
-
Fuse 19 on fuse holder B
SB21
-
Fuse 21 on fuse holder B
SB22
-
Fuse 22 on fuse holder B
SB23
-
Fuse 23 on fuse holder B
SB24
-
Fuse 24 on fuse holder B
SB25
-
Fuse 25 on fuse holder B
SB26
-
Fuse 26 on fuse holder B
SB28
-
Fuse 28 on fuse holder B
T14a
-
14-pin connector
T40a
-
40-pin connector
D180
-
Connection (87a), in engine compartment wiring harness
D202
-
Connection 6 (87a), in engine compartment wiring harness
*
-
Up to October 2011
*2
-
From November 2011
León
Current Flow Diagram
No.
140 /
7
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Automatic glow period control unit, Glow plug 1, Glow plug 2, Glow plug 3, Glow plug 4, Fuse holder B, Push-in bridge
J179
-
Automatic glow period control unit, on left in engine compartment, under E-box Low
J519
-
Onboard supply control unit
Q10
-
Glow plug 1
Q11
-
Glow plug 2
Q12
-
Glow plug 3
Q13
-
Glow plug 4
SB
-
Fuse holder B, on left in engine compartment (low box)
SB20
-
Fuse 20 on fuse holder B
SB27
-
Fuse 27 on fuse holder B
SB29
-
Fuse 29 on fuse holder B
SB30
-
Fuse 30 on fuse holder B
T11a
-
11-pin connector
T14a
-
14-pin connector, near front left longitudinal member
T40a
-
40-pin connector
TV23
-
Push-in bridge
León
Current Flow Diagram
No.
140 /
8
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Engine control unit
J519
-
Onboard supply control unit
J623
-
Engine control unit, central in plenum chamber
T94a
-
94-pin connector
132
-
Earth connection 3, in engine compartment wiring harness
607
-
Earth point, on left in plenum chamber
D182
-
Connection 3 (87a), in engine compartment wiring harness
León
Current Flow Diagram
No.
140 /
9
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Intake air temperature sender, Pressure differential sender, Gearbox neutral position sender, Engine control unit, Intake manifold preheating heater element
G31
-
Charge pressure sender
G42
-
Intake air temperature sender
G505
-
Pressure differential sender
G701
-
Gearbox neutral position sender
J519
-
Onboard supply control unit
J623
-
Engine control unit, central in plenum chamber
N51
-
Intake manifold preheating heater element
T3x
-
3-pin connector
T4ad
-
4-pin connector
T94a
-
94-pin connector
328
-
Earth connection 2 (sender earth), in engine compartment wiring harness
672
-
Earth point 2, on front of left longitudinal member
D195
-
Connection 1 (5V) in engine compartment wiring harness
*
-
Only for countries with cold climate
León
Current Flow Diagram
No.
140 /
10
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Radiator outlet coolant temperature sender, Exhaust gas temperature sender 1, Exhaust gas temperature sender 3, Exhaust gas temperature sender 4, Engine control unit
G83
-
Radiator outlet coolant temperature sender
G235
-
Exhaust gas temperature sender 1
G495
-
Exhaust gas temperature sender 3
G648
-
Exhaust gas temperature sender 4
J359
-
Low heat output relay, on relay carrier, on left of dash panel
J360
-
High heat output relay, on relay carrier, on left of dash panel
J519
-
Onboard supply control unit
J623
-
Engine control unit, central in plenum chamber
T2ai
-
2-pin connector, brown
T2aj
-
2-pin connector, black
T2ak
-
2-pin connector, orange
T6r
-
6-pin connector
T9b
-
9-pin connector
T14a
-
14-pin connector, near front left longitudinal member
T94a
-
94-pin connector
327
-
Earth connection (sender earth), in engine compartment wiring harness
*
-
Only models with auxiliary air heater
León
Current Flow Diagram
No.
140 /
11
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Engine control unit, Injector, cylinder 1, Injector, cylinder 2, Injector, cylinder 3, Injector, cylinder 4
J519
-
Onboard supply control unit
J623
-
Engine control unit, central in plenum chamber
N30
-
Injector, cylinder 1
N31
-
Injector, cylinder 2
N32
-
Injector, cylinder 3
N33
-
Injector, cylinder 4
T60a
-
60-pin connector
León
Current Flow Diagram
No.
140 /
12
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Air mass meter, Accelerator position sender, Engine control unit
G70
-
Air mass meter
G79
-
Accelerator position sender
G185
-
Accelerator position sender 2
J293
-
Radiator fan control unit
J519
-
Onboard supply control unit
J623
-
Engine control unit, central in plenum chamber
T4b
-
4-pin connector
T6h
-
6-pin connector
T94a
-
94-pin connector
V7
-
Radiator fan
León
Current Flow Diagram
No.
140 /
13
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Coolant temperature sender, Fuel temperature sender, Engine control unit, Fuel pressure regulating valve, Fuel metering valve, Coolant circulation pump 2
G62
-
Coolant temperature sender
G81
-
Fuel temperature sender
J519
-
Onboard supply control unit
J623
-
Engine control unit, central in plenum chamber
N276
-
Fuel pressure regulating valve
N290
-
Fuel metering valve
T14a
-
14-pin connector, near front left longitudinal member
T60a
-
60-pin connector
V178
-
Coolant circulation pump 2
474
-
Earth connection (sender earth) in engine prewiring harness
672
-
Earth point 2, on front of left longitudinal member
D173
-
Connection (87), in engine prewiring harness
León
Current Flow Diagram
No.
140 /
14
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Engine speed sender, Lambda probe, Fuel pressure sender, Engine control unit, Lambda probe heater
G28
-
Engine speed sender
G39
-
Lambda probe
G247
-
Fuel pressure sender
J519
-
Onboard supply control unit
J623
-
Engine control unit, central in plenum chamber
T6k
-
6-pin connector
T60a
-
60-pin connector
T94a
-
94-pin connector
Z19
-
Lambda probe heater
220
-
Earth connection (sender earth), in engine wiring harness
D141
-
Connection (5V) in engine prewiring harness
*
-
Up to October 2011
*2
-
From November 2011
León
Current Flow Diagram
No.
140 /
15
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Position sender for charge pressure positioner, Throttle valve module, Engine control unit, Exhaust gas recirculation valve
G69
-
Throttle valve potentiometer
G212
-
Exhaust gas recirculation potentiometer
G581
-
Position sender for charge pressure positioner
J338
-
Throttle valve module
J519
-
Onboard supply control unit
J623
-
Engine control unit, central in plenum chamber
N18
-
Exhaust gas recirculation valve
T60a
-
60-pin connector
220
-
Earth connection (sender earth), in engine wiring harness
D141
-
Connection (5V) in engine prewiring harness
León
Current Flow Diagram
No.
140 /
16
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Hall sender, Engine control unit
G40
-
Hall sender
J519
-
Onboard supply control unit
J623
-
Engine control unit, central in plenum chamber
T3d
-
3-pin connector, front in engine compartment
T60a
-
60-pin connector
220
-
Earth connection (sender earth), in engine wiring harness
D141
-
Connection (5V) in engine prewiring harness
León
Current Flow Diagram
No.
140 /
17
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Start/Stop operation button, Engine control unit, Charge pressure control solenoid valve, Exhaust gas recirculation cooler changeover valve
E693
-
Start/Stop operation button
J519
-
Onboard supply control unit
J623
-
Engine control unit, central in plenum chamber
K259
-
Start/Stop operation warning lamp
L76
-
Button illumination bulb
N75
-
Charge pressure control solenoid valve
N345
-
Exhaust gas recirculation cooler changeover valve
T6af
-
6-pin connector
T10a
-
10-pin connector, near front left longitudinal member
T14a
-
14-pin connector, near front left longitudinal member
T52b
-
52-pin connector
T60a
-
60-pin connector
T94a
-
94-pin connector
A4
-
Positive connection (58b), in dash panel wiring harness
A49
-
Connection 1, in dash panel wiring harness
A138
-
Connection 2, in dash panel wiring harness
A192
-
Positive connection 3 (15a) in dash panel wiring harness
D102
-
Connection 2 in engine compartment wiring harness
*
-
Up to October 2011
*2
-
Only models with extended servicing intervals (ESI)
*3
-
From November 2011
León
Current Flow Diagram
No.
140 /
18
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Brake pedal position sender, Clutch position sender, Engine control unit
G100
-
Brake pedal position sender
G476
-
Clutch position sender
J519
-
Onboard supply control unit
J623
-
Engine control unit, central in plenum chamber
T4y
-
4-pin connector
T5d
-
5-pin connector
T52c
-
52-pin connector
T94a
-
94-pin connector
383
-
Earth connection 18, in main wiring harness
671
-
Earth point 1, on front of left longitudinal member
B131
-
Connection (54), in interior wiring harness
D111
-
Connection 9 in engine compartment wiring harness
*
-
Up to October 2011
*2
-
Only models with ABS
*3
-
Only models with ABS, EDL, TCS and ESP
*4
-
From November 2011
León
Current Flow Diagram
No.
140 /
19
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Voltage stabiliser, Engine control unit, Terminal 50 voltage supply relay, Starter relay 2
J519
-
Onboard supply control unit
J532
-
Voltage stabiliser
J623
-
Engine control unit, central in plenum chamber
J682
-
Terminal 50 voltage supply relay, on relay carrier, on left of dash panel
J907
-
Starter relay 2, on relay carrier, on left of dash panel
T6ae
-
6-pin connector
T9a
-
9-pin connector
T12j
-
12-pin connector
T52c
-
52-pin connector
T94a
-
94-pin connector
A41
-
Positive connection (50), in dash panel wiring harness
B383
-
Connection 1 (powertrain CAN bus, high), in main wiring harness
B390
-
Connection 1 (powertrain CAN bus, low), in main wiring harness
León
Current Flow Diagram
No.
140 /
20
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Terminal 15 voltage supply relay 2, Fuse holder C
J519
-
Onboard supply control unit
J681
-
Terminal 15 voltage supply relay 2, on relay carrier, on left of dash panel
SC
-
Fuse holder C
SC1
-
Fuse 1 on fuse holder C
SC2
-
Fuse 2 on fuse holder C
SC4
-
Fuse 4 on fuse holder C
SC18
-
Fuse 18 on fuse holder C
SC27
-
Fuse 27 on fuse holder C
T9c
-
9-pin connector
T52b
-
52-pin connector
A20
-
Positive connection (15a), in dash panel wiring harness
A38
-
Positive connection 2 (15a) in dash panel wiring harness
A40
-
Positive connection 1 (30), in dash panel wiring harness
B156
-
Positive connection (30a), in interior wiring harness
B246
-
Positive connection (30a, stabilised), in interior wiring harness
B278
-
Positive connection 2 (15a) in main wiring harness
B383
-
Connection 1 (powertrain CAN bus, high), in main wiring harness
B390
-
Connection 1 (powertrain CAN bus, low), in main wiring harness
*
-
Only left-hand drive models
*2
-
Up to October 2011
León
Current Flow Diagram
No.
140 /
21
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Control unit in dash panel insert, Data bus diagnostic interface
J104
-
ABS control unit
J285
-
Control unit in dash panel insert
J533
-
Data bus diagnostic interface, under steering wheel
T20k
-
20-pin connector
T26a
-
26-pin connector
T32b
-
32-pin connector
T47a
-
47-pin connector
238
-
Earth connection 1, in interior wiring harness
367
-
Earth connection 2, in main wiring harness
602
-
Earth point, in front left footwell
B383
-
Connection 1 (powertrain CAN bus, high), in main wiring harness
B390
-
Connection 1 (powertrain CAN bus, low), in main wiring harness
B397
-
Connection 1 (convenience CAN bus, high), in main wiring harness
B406
-
Connection 1 (convenience CAN bus, low), in main wiring harness
*
-
Only models with ABS
*2
-
Only models with ABS, EDL, TCS and ESP
León
Current Flow Diagram
No.
140 /
22
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Fuel gauge, Rev. counter, Speedometer, Coolant shortage indicator sender, Control unit in dash panel insert
G1
-
Fuel gauge
G3
-
Coolant temperature gauge
G5
-
Rev. counter
G21
-
Speedometer
G32
-
Coolant shortage indicator sender
J285
-
Control unit in dash panel insert
K2
-
Alternator warning lamp
K28
-
Coolant temperature and coolant shortage warning lamp
K29
-
Glow period warning lamp
K31
-
Cruise control system warning lamp
K83
-
Exhaust emissions warning lamp
K105
-
Reserve fuel warning lamp
K231
-
Diesel particulate filter warning lamp
T32b
-
32-pin connector
269
-
Earth connection (sender earth) 1, in dash panel wiring harness
León
Current Flow Diagram
No.
140 /
23
ws
=
white
sw
=
black
ro
=
red
rt
=
red
br
=
brown
gn
=
green
bl
=
blue
gr
=
grey
li
=
purple
vi
=
purple
ge
=
yellow
or
=
orange
rs
=
pink
Oil pressure switch, Oil level and oil temperature sender, Buzzer and gong, Control unit in dash panel insert, Oil pressure warning lamp, Oil level warning lamp
F1
-
Oil pressure switch
G266
-
Oil level and oil temperature sender
H3
-
Buzzer and gong
J285
-
Control unit in dash panel insert
K3
-
Oil pressure warning lamp
K38
-
Oil level warning lamp
T6j
-
6-pin connector, near front left longitudinal member
T14a
-
14-pin connector, near front left longitudinal member
T32b
-
32-pin connector
317
-
Earth connection 7, in engine compartment wiring harness
335
-
Earth connection 5, in dash panel wiring harness
672
-
Earth point 2, on front of left longitudinal member
*
-
Only models with extended servicing intervals (ESI)