1995 RENAULT MEGANE SCENIC sensor

INJECTION
Richness regulation
17
Non-loop mode
When richness regulation is occurring, the operating phases when the computer ignores the voltage in-
formation from the oxygen sensor are:
- Full load: #35 = variable and greater than 128
- Sharp acceleration: #35 = variable and greater than 128
- Sharp deceleration with no load information (injection cut) : #35 = 128
- Oxygen sensor fault: #35 = 128
DEFECT MODE IN THE EVENT OF AN OXYGEN SENSOR FAULT
If the voltage from the oxygen sensor is incorrect (# 05 varies only slightly or not at all) during richness regu-
lation, the computer will only enter defect mode (# 35 = 128) if the fault has been present for 3 to 5 minutes.
The fault will be memorised in this case only.
If an oxygen sensor fault is present and recognised and if the fault has already been stored, the system enters
the open loop mode directly (# 35 = 128).
17-35

INJECTION
Operating wiring diagram
17
KEY TO OPERATIONAL WIRING DIAGRAMS (E7J, F3R, K7M)
COMPONENT NO DESCRIPTION
109
119
120
146
147
149
193 to 196
218
222
224
225
228
236
238
242
244
247
250
272
310
319
341
371
398
437
565
597
645
649
663
664
679
746
772
777
927
MF
MHOn board computer
Automatic transmission computer
Injection computer
Pinking sensor (located under the inlet manifold for E7J engine)
Absolute pressure sensor
TDC sensor
Injectors
Fuel pump
Throttle position potentiometer
Power assisted steering pressostat
Diagnostic socket
Idle speed regulation micromotor
Fuel pump relay (in engine fuse box)
Injection feed locking relay
Oxygen sensor
Coolant temperature sensor
Instrument panel
Vehicle speed sensor
Air temperature sensor
Ignition power module
Air conditioning control panel
Idle speed regulation solenoid valve
Fuel vapour recirculation solenoid valve
Exhaust gas recirculation solenoid valve (EGR)
Throttle body heater (under throttle body)
Throttle body assembly
Engine fuse box
Passenger compartment connection unit
Idle speed regulation stepping motor
Dual ignition coil n°1 (cylinders 1 and 4)
Dual ignition coil n° 2 (cylinders 2 and 3)
Radio anti-interference condenser
Cylinder reference sensor
Heater relay (in engine fuse box)
Power fuse board (near battery)
Inertia switch
Rear right hand electrical earth
Engine electrical earth (located on the cylinder block between the starter and the al-
ternator for the E7J engine)
17-39

INJECTION
Operating wiring diagram
17
E7J engine
COMPUTER TRACK ALLOCATION
TrackALLOCATION
1Power earth
2Electronic earth
3Vehicle speed information
4+ before ignition (permanent) computer memory
5Canister bleed signal (sequential earth period)
6Pump relay control (via track N° 2)
7Locking relay control (via track N° 2)
8Diagnostic line for erasing the memory and power assisted steering pressostat information
9Throttle position potentiometer information (pin N° 4 on 222)
10Heater relay command
11TDC sensor signal (track B)
12Rev counter information at instrument panel
13Connection with injection fault warning light on instrument panel
14Air temperature information
15Coolant temperature information
16+ 5 V feed for absolute pressure sensor and throttle potentiometer
17Common earth for absolute pressure sensor, throttle potentiometer and coolant temperature
sensor
18Emission of diagnostic signal to diagnostic socket
19Main computer feed via injection locking relay
20Air conditioning compressor command
21Injector control via earth
22Not used
23+ or - feed to idle speed micromotor (pin N° 1)
24+ or - feed to idle speed micromotor (pin N° 2)
17-41

INJECTION
Operating wiring diagram
17
E7J engine
TrackALLOCATION
25No load information input
26Not used
27Power module command
28TDC sensor signal input (track A)
29Immobiliser coded line input via decoder unit
30+ 12 V information when ignition turned on
31Pinking sensor noise signal input
32+ 12 V after ignition information
33Voltage information dependent on manifold pressure seen by sensor (on track B)
34Air conditioning compressor operation request input
35Voltage from oxygen sensor input
17-42

INJECTION
Operating wiring diagram
17
K7M engine
COMPUTER TRACK ALLOCATION
TrackALLOCATION
1Not used
2Power earth n° 1
3Power earth n° 2
4Command for injector n° 2 and n° 3 via earth
5Air conditioning on - off information and request for compressor operation authorisation
(0 - 12 V)
6Heated windscreen information (0 - 12 V)
7Park / Neutral / torque reduction information (0 - 5 V) (K7M 703)
8Pinking sensor signal
9Stepping motor control (0 - 12 V)
10EGR solenoid valve control (0 - 12 V) (K7M 703)
11Bi-directional diagnostic line K used for entry into fault finding mode
(looking for computer), emission of diagnostic signals from computer, application of command
modes (G..*), erasing the memory (G0**)
and ending fault finding (G13*)
12Vehicle speed information
13Power assisted steering pressostat information
14Not used
15Coolant temperature sensor information
16Manifold pressure information transcribed by absolute pressure sensor
17Voltage information from oxygen sensor
18Earth
19Throttle position potentiometer information
20Air temperature sensor information
21Not used
22Not used
23Not used
24+ 12 V after ignition
17-44

INJECTION
Operating wiring diagram
17
TrackALLOCATION
25Not used
26Not used
27Not used
28Command for coil for cylinders 1 and 4
29Command for coil for cylinders 2 and 3
30Command for injector n° 1 and n° 4 via earth (n° 1 flywheel end)
31Pinking sensor screened cable
32+12 V before ignition
33TDC sensor signal (track B)
34TDC sensor signal (track A)
35Stepping motor command (0 - 12 V)
36Stepping motor command (0 - 12 V)
37Immobiliser coded line input
38Uni-directional diagnostic line L for entry into diagnostic mode only
(looking for computer)
39Not used
40Stepping motor command (0 - 12 V)
41Throttle angle information for automatic transmission computer
42RCO control (sequential earth period for canister bleed solenoid valve RCO)
43Command for injection fault warning light on instrument panel
44Common earth for pinking sensor and coolant temperature sensor and absolute pressure sensor
45+ 5 V feed for absolute pressure sensor and throttle position potentiometer
46Common earth for air temperature sensor and throttle position potentiometer
47Not used
48Command (via earth) for fuel pump relay and engine speed information
49Not used
K7M engine
17-45

INJECTION
Operating wiring diagram
17
COMPUTER TRACK ALLOCATION
TrackALLOCATION
1Not used
2Power earth n° 1
3Power earth n° 2
4Command for injector n° 3 via earth
5Heated windscreen information (0 - 12 V)
6Air conditioning on - off information and request for compressor operation authorisation
(0 - 12 V)
7Park / Neutral / torque reduction information (0 - 5 V) (F3R 751)
8Pinking sensor signal
9Not used
10Not used
11Bi-directional diagnostic line K used for entry into fault finding mode
(looking for computer), emission of diagnostic signals from computer, application of command
modes (G..*), erasing the memory (G0**)
and ending fault finding (G13*)
12Vehicle speed information
13Fuel flow information for on board computer
14Not used
15Coolant temperature sensor information
16Manifold pressure information transcribed by absolute pressure sensor
17Voltage information from oxygen sensor
18Oxygen sensor earth
19Throttle position potentiometer information
20Air temperature sensor information
21Not used
22Not used
23Not used
24+ 12 V after ignition
F3R engine
17-48

INJECTION
Operating wiring diagram
17
TrackALLOCATION
25Command for injector n° 2 via earth
26Command for injection fault warning light on instrument panel
27Not used
28Command for coil for cylinders 1 and 4
29Command for coil for cylinders 2 and 3
30Command for injector n° 4 via earth (timing end)
31Pinking sensor screened cable
32+12 V before ignition
33TDC sensor signal (track B)
34TDC sensor signal (track A)
35Immobiliser coded line input
36Not used
37Not used
38Uni-directional diagnostic line L for entry into diagnostic mode only
(looking for computer)
39Not used
40Not used
41Throttle angle information for automatic transmission computer
42Cylinder reference sensor information
43Engine speed information
44Common earth for pinking sensor and coolant temperature sensor and absolute pressure sensor
45+ 5 V feed for absolute pressure sensor and throttle position potentiometer
46Common earth for air temperature sensor and throttle position potentiometer
47Not used
48Command (via earth) for fuel pump relay (236)
49Not used
F3R engine
17-49