RENAULT MEGANE SCENIC 1995 Service Repair Manual

STARTING - CHARGING
Alternator
16
OPTIMA 5800 diagnostic station
CHECKING THE CHARGING CIRCUIT USING THE DIAGNOSTIC STATION
The OPTIMA 5800 diagnostic station is used to test the alternator by measuring the voltage and current flow,
with and without electrical consumers.
NOTE : the ampermetric clamp on the station is of the inductive type (measuring range : 0 to 1000 A). It may
be positioned without disconnecting the battery, whichallows computers to retain their memory and set-
tings.
Depending on the engine, the ampermetric clamp may be positioned in different locations (the diagnostic
station will detect incorrect positioning) :
- F3R, F8Q engines : directly at the alternator output, the arrow on the clamp pointing towards the alterna-
tor.
- E7J, K7M engines : on the cable connecting the positive battery terminal to the alternator (this cable
crosses the battery compartment partition).
Measurements are made in three stages:
- measurement of battery voltage, ignition off,
- measurement with no consumers of the regulated voltage and current flow,
- measurement with the maximum number of consumers of the regulated voltage and current flow.
At the end of the test, the values noted will form the basis of a diagnostic report message:
- Battery voltage no load < 12.3 V = battery discharged.
Without consumers:
- Regulated voltage > 14.8 V = > regulator faulty,
- (Regulated voltage no load < 13.2 V) or (charging current < 2 A = > charging fault).
With consumers:
- Regulated voltage > 14.8 V = > regulator faulty,
- Regulated voltage < 12.7 V = > check the alternator flow with reference to its specifications:
Engine E7J K7M F3R F8Q
Without air conditioning 75 (45) 75 (50) 75 (50) 75 (50)
With air conditioning / 110 (80) 110 (80) 110 (80)
Notes for the table: - Current values in Amps.
- The value in brackets corresponds to the minimum flow which should be
supplied by the alternator when all consumers are connected.
FAULT FINDING
SPECIAL TOOLING REQUIRED
16-7

STARTING - CHARGING
Alternator
16
If the measured flow is too low, check:
- if the alternator is worn (brushes....),
- the battery connections,
- the engine earth strap,
- the conformity of the alternator,
- the belt tension.
If the flow measured is correct and the regulated voltage is too low, the alternator is not at fault.
The fault is caused by :
- the vehicle having too many consumers or,
- the battery being discharged.
FAULT FINDING (cont)
16-8

STARTING - CHARGING
Starter motor
16
VEHICLE ENGINE STARTER
BA0E
E7JVALÉO D 6 R A 133
MITSUBICHI M 002 T 48381
BA0F - BA0L
K7MVALÉO D 6 R A 133
BA0G
F3RVALÉO D 6 R A 133
BOSCH 0001107047
BA0G - BA0AF8QBOSCH 000 1110114BOSCH B 001115006
REMOVAL
There are no special notes for removing and refit-
ting the starter.
Check the centring dowel (B) is present, which
should be located in the position shown on the ta-
ble.
86070R1
Engine Location of dowel
E 7 J / K 7 M Y
F 3 R
F 8 QZ
16-9

STARTING - CHARGING
Starter motor
16
OPTIMA 5800 diagnostic station
CHECKING THE STARTER USING THE DIAGNOSTIC STATION
The starter may be tested using the OPTIMA 5800 diagnostic station, by measuring the battery voltage and
the current used during the starting phase. The following operating faults may be detected:
- battery fault (voltage drops when the starter is activated),
- starter jammed (the current used is too high),
- starter fault (the current used is too low).
To carry out the test the vehicle must be prevented from starting:
- E7J, K7M engines : disconnect the engine speed sensor (on the clutch bellhousing),
- F3R engines : disconnect the engine speed sensor (on the gearbox),
- F8Q engines : disconnect the fuel shut off on the pump and insulate the terminal.
NOTE :
- an open circuit on the engine speed sensor or the ignition creates a fault which is memorised in the injec-
tion computer. Erase this fault using the XR25 (see injection section),
- if the vehicle is fitted with an immobiliser, just lock the doors using the PLIP.
FAULT FINDING
SPECIAL TOOLING REQUIRED
16-10

IGNITION
Power module
17
E7J engine
The injection computer incorporates the ignition
advance calculation function and sends a control
signal (5 V) to the ignition power module.
97351R
3 track connector
A+ after ignition
BIgnition power module earth
CNot used
2 track connector
ANot used
BControl signal
17-1

98900-1R
IGNITION
Static ignition
17
The differences between static ignition with two
coils and distributed ignition are:
- the high voltage distributor is no longer used,
- two dual output coils are used.
PRESENTATION
The system comprises:
- the injection computer (the ignition power
stage is integrated into the computer),
- two dual output coils,
- four spark plugs,
- an anti-interference condenser.
DESCRIPTION - OPERATING PRINCIPLE
COMPUTER
The injection computer (120), depending on the
information received from various sensors, but
principally depending on the engine speed and
load, determines:
- the number of degrees of advance to be used
and consequently the ignition point,
- which cylinders are at TDC and consequently
the ignition coil to be operated.
The spark is created at the two cylinders at TDC by
cutting the earth to the coil concerned.
COILS
There are two coils. They are of the dual output
type.
They are controlled separately by the computer.
They create two sparks at the same time.They have a foolproofing device (K7M engine):
- on their base to prevent them being fitted in-
correctly to the rocker box cover,
- at the retaining clips for the high voltage
leads.
They are colour coded on the 3 track electrical
connectors.
Coil (2) has a black electrical connector. This coil
provides the sparks for cylinders 1 and 4 at the
same time. It is controlled by track 28 on the injec-
tion computer.
Coil (3) has a grey electrical connector. This coil
provides the sparks for cylinders 2 and 3 at the
same time. It is controlled by track 29 on the injec-
tion computer.
Both coils are connected to an anti-interference
condenser (1).
F3R engine
F3R - K7M
engines
17-2

IGNITION
Static ignition
17
99365R
K7M engine
Electrical connector
Track Allocation
1+anti-interference
condenser
2 +after ignition
3 coil control via computer
Connector
Track number+-
123 Coil connector track identification
Inscription on connector
Test to be made
between tracksResistance
K7M engine F3R engine
1 - 2 0.5 Ω0.2 Ω
1 - 3 1 Ω1 Ω
2 - 3 1 Ω1 Ω
HT - HT10 kΩ8 kΩ
F3R - K7M
engines
DIAGRAM
PRJ99029
KEY TO COMPONENTS
120Injection computer
597Engine fuse box
663Dual output ignition coil for cylinders
1 and 4
664Dual output ignition coil for cylinders
2 and 3
679Anti-interference condenser, connected to
coil:
-664 for F3R engines
-663 for K7M engines (dotted line)
17-3

86065-3R
IGNITION
Static ignition
17
F3R - K7M
engines
NOTE : advance correction depending on the si-
gnal from the pinking sensor is dealt with in sec-
tion 17 Injection.
Cylinder 1 is at the flywheel end.SPECIAL NOTES FOR THE FLYWHEEL
Description
The flywheel has 60 regularly spaced teeth. Two
teeth have been removed to create a fixed marker
gap at 84° or 14 teeth before TDC for cylinders 1
and 4. There are therefore in fact only 58 teeth.
Cylinders 1 and 4 are at TDC when the arrow (A)
passes in front of the engine speed sensor (169).
Cylinders 2 and 3 are at TDC when the arrow (B)
passes in front of the engine speed sensor (169).
Operating principle
The computer knows that TDC for cylinders 1 and
4 is located on the rising edge of the 15th tooth
after the fixed gap. Consequently, depending on
the amount of advance to be used, the computer
knows exactly where to locate the ignition point
by counting the number of teeth.
TDC for cylinders 2 and 3 is located on the rising
edge of the 45th tooth after the fixed gap.
17-4

IGNITION
Spark plugs
17
Engine Make Type
E7J
EYQUEM
NGK
FC 52 LS
BCP 5ES
K7MEYQUEM
CHAMPIONFC 52 LS
C10YC
F3R
EYQUEM
CHAMPION
BOSCH
C 52 LS
N7Y CX
W7DCO
Flat base with seal
Gap 0.9 mm
Tightening torque 2.5 to 3 daN.m
E7J - K7M -F3R
engines
17-5

SPECIAL NOTES FOR BOSCH MONOPOINT INJECTION
• Use the XR25 with the latest cassette and fiche n° 28.
Read the computer Part Number using code G70*.
Erase the memory using code G0**.
• Injection warning light operational (see principle of ignition section).
• Maximum engine speed before ignition cut-out: 6 500 rpm.
• Corrected idle speed after operation of the air conditioning: 900 rpm.
• Corrected idle speed with wheels at full lock (power assisted steering pressostat information) : 825 rpm.
• Canister bleed solenoid valve controlled by RCO signal depending on engine operating conditions (the
valve is not operated for no load).
• If there is a fault with the absolute pressure sensor, the manifold pressure is recreated depending on the
throttle position and the engine speed.
• Reading of the default values from the air temperature sensor (#03) or coolant temperature sensor (#02),
not the values taken in defect mode by the computer when they are recognised as being faulty.
• There is a+after ignition input (track 30) to inform the computer that the ignition has been turned off
while it remains fed for a few seconds to reposition the idle speed micromotor.
(Avoids false detection of a fault in the engine immobiliser system).
INJECTION
General
17
E7J engine
FITTING A 2ND GENERATION ENGINE IMMOBILISER REQUIRES A SPECIAL PROCEDURE FOR REPLACING THE
COMPUTER.
17-6