open gas tank RENAULT SCENIC 2008 J84 / 2.G Gas Injection LPG 3000 Workshop Manual

17C-6
MR-372-J84-17C000$059.mif
V2
GAS INJECTION
Fault finding - Introduction
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
2. FAULT FINDING LOG
You will always be asked for this log:
–when requesting technical assistance from the Techline,
–for approval requests when replacing parts for which approval is obligatory,
–to be enclosed when returning monitored parts on request. The log is needed for warranty reimbursement,
and enables better analysis of the parts which have been removed.
5. SAFETY INSTRUCTIONS
Safety rules must be observed during any work on a component to prevent any damage or injury:
–make sure that the battery is properly charged to avoid damaging the computers with a low charge,
–use the appropriate tools.
Safety instructions that must be followed before any operation is performed on the vehicle
–If a major LPG leak occurs, the vehicle must be isolated, away from buildings and any fire risks.
–the emergency services may be required to intervene if the situation cannot be controlled.
–all work on the LPG circuit must be performed by qualified and authorised personnel,
–do not try to open the tank. Never try to remove the multi-valve located at the end of the tank.
–do not clean the engine compartment using a pressure system with detergents.
–always refer to the RENAULT Workshop Repair Manual before performing any work.
Safety instructions that must be followed when any operation is performed on the vehicle
–all work must be carried out in a well-ventilated space,
–there must not be any naked flames, sparks, lit cigarettes or telephones near the area where work is being
carried out,
–the operator must not wear acrylic clothes likely to generate static electricity.
–disconnect the battery and leave the vehicle on the ground,
–if working on the tank, drain it by running the engine in LPG mode,
–once drained and removed, the tank can be sent to GIAT, complete with its mounting,
–if work is to be done in the spray booth, remove the tank (with its mounting),
–the tank must not be subjected to temperatures greater than 50°C. IMPORTANTIMPORTANT
Any fault on a complex system must undergo a thorough fault finding procedure with the
appropriate tools. The FAULT FINDING LOG, which should be completed during the fault finding
procedure, ensures a record is kept of the procedure carried out. It is an essential component
when consulting the manufacturer.
IT IS THEREFORE MANDATORY TO FILL OUT A FAULT FINDING LOG EVERY TIME
THE TECHLINE OR THE WARRANTY RETURN SERVICE ASKS FOR IT.

17C-7
MR-372-J84-17C000$059.mif
V2
GAS INJECTION
Fault finding - Introduction
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
Safety instructions that must be followed after any operation is performed on the vehicle
–after working on an LPG union, check that it is not leaking after it has been refitted,
–apply soapy water or the product distributed by SODICAM, part number 77 11 143 071 (leak detector) to the
open union(s),
–fill the fuel tank with a few litres of LPG if it has been bled (the ignition must be switched off first),
–start the engine, put it in LPG mode and check again that there is no leak,
–if a leak is detected, retighten the union concerned. If the leak persists, refit the union,
–fill the fuel tank (80% of the total volume). start the engine, put it in LPG mode and check that there is no leak,
–after refitting, check that all the rubber and encased steel LPG pipes are not in contact with any parts that may
cause them to wear and create an LPG leak.

17C-10
MR-372-J84-17C000$118.mif
V2
GAS INJECTION
Fault finding - System operation
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
The GAS 3000 computer manages "gas" actuator control, i.e. the "gas" injectors, the gas system relays and solenoid
valves, the fuel pump cut-off relay and the management of the fuel sender. Before switching to "Gas" mode, the
computer always checks that the pressure and the temperature of the gas are correct and that the "gas" solenoid
valves are open.
The combustible material is stored in an independent toric tank. LPG is stored in a semi-gaseous state at a pressure
of approximately 15 bar.
CNG is stored in a cylindrical tank in a gaseous state at a pressure of approximately 200 bar, and is transported to
the expansion valve/reducer via a rigid high pressure pipe. The rest of the system is a low pressure pipe going from
the expansion valve/reducer to the injectors. For CNG, there is a gas filter between the expansion valve and the rail.
Malfunctions / Special cases
These are characterised by operation in Petrol mode, although the driver has selected LPG mode.
An operational fault must be caused by the LPG system if it cannot be reproduced in Petrol mode.
Forced Petrol mode when LPG is faulty.
The level 1 warning light is controlled by the petrol injection computer; the gas warning light is controlled by the GAS
3000 computer.
The system automatically switches to "petrol" mode when the tank is empty or when the conditions allowing
operation in "gas" mode are not satisfied.

17C-26
MR-372-J84-17C000$354.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF021
PRESENT
OR
STOREDLPG TANK SOLENOID VALVE RELAY CIRCUIT
CC.1: Short circuit to + 12 Volts
CO.0: Open circuit or short circuit to earth
1.DEF: Non-compliance with emission control standards
NOTESPriority when dealing with a number of faults:
If fault DF024 Fuel pump cut-off relay circuit is present or stored, deal with this fault
first.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present after the engine has been started and switched to LPG
mode.
Manipulate the wiring harness between the LPG computer and the LPG tank solenoid valve relay in order to
produce a change in status (present ↔ stored).
Look for possible damage to the wiring harness and check the condition and connection of the LPG tank
solenoid valve relay and its connections.
If necessary, repair or replace the connector.
With the ignition on, check for + 12V on track 1 of the LPG tank solenoid valve relay and track C2 of the LPG
computer.
If no + 12 V:
–disconnect the battery,
–in the Protection and Switching Unit, disconnect the grey connector,
–check the cleanliness and condition of the connections,
–Use the universal bornier to check the continuity of the following connection:
For Mégane 2:
Protection and Switching Unit, grey connector, track 1
For Logan:
Fuse box, track S4track 3 of the main relay
track A5 of the main relay
Repair if necessary.
Check for + 12V on track 3 of the LPG tank solenoid valve relay.
If + 12V is not present, use the universal bornier to check the continuity of the following connection:
For Mégane 2:
Tank solenoid valve relay track 3
For Logan:
Double control relay unit track B3track 5 of the fuel pump relay
track B5 of the fuel pump relay
Repair if necessary.
AFTER REPAIRDeal with any faults displayed by the diagnostic tool.
Clear the computer memory.
Carry out a road test followed by another check with the diagnostic tool.
GAZ3000_V08_DF021 / GAZ3000_V10_DF021

17C-29
MR-372-J84-17C000$354.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF024
PRESENT
OR
STOREDFUEL PUMP CUT-OFF RELAY CIRCUIT
CO.0: Open circuit or short circuit to earth
CC.1: Short circuit to + 12 Volts
1.DEF: Non-compliance with emission control standards
NOTESPriority when dealing with a number of faults:
If fault DF021 LPG tank solenoid valve relay circuit is present or stored, deal with
this fault first.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present after the engine has been running for 10 seconds in
LPG mode.
Manipulate the wiring harness between the LPG computer and the fuel pump cut-off relay in order to produce
a change in status (present ↔ stored).
Look for any damage to the wiring harness and check the connection and condition of the fuel pump cut-off
relay and its connections.
Check the insulation in relation to earth and the continuity and the absence of interference resistance on
the connection between:
For Mégane 2:
Main relay track 5
For Logan:
Double control relay unit track A3track 1 of the fuel pump cut-off relay
track B5 of the fuel pump cut-off relay
Repair if necessary.
Check the insulation in relation to + 12V and the continuity and absence of interference resistance on
the connection between:
LPG computer track F3 track 2 of the fuel pump cut-off relay
Repair if necessary.
In LPG operating mode, using status ET025 Fuel pump, check that status ET025 is ACTIVE when starting
and then changes to INACTIVE after 1 minute.
If ET025 does not change to INACTIVE, check for earth on track 2 of the fuel pump cut-off relay.
If, with the ignition on, the computer does not control the fuel pump cut-off relay on track 2 through an earth,
contact your Techline.
If the fault is still present, replace the fuel pump cut-off relay.
If the fault is still present, deal with the other faults, then proceed to the conformity check.
AFTER REPAIRDeal with any faults displayed by the diagnostic tool.
Clear the computer memory.
Carry out a road test followed by another check with the diagnostic tool.
GAZ3000_V08_DF024 / GAZ3000_V10_DF024

17C-31
MR-372-J84-17C000$354.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF029
PRESENT
OR
STOREDLPG TANK SENDER SIGNAL VOLTAGE
CO.0: Open circuit or short circuit to earth
CO.1: Open circuit or short circuit to + 12V
CC.0: Short circuit to earth
1.DEF: Non-compliance with emission control standards
IMPORTANT
When carrying out an operation on an LPG supply circuit component, consult the safety instructions
(see 17D, Gas injection, Introduction, Safety instructions for all operations).
NOTESConditions for applying the fault finding procedure to stored faults:
The fault is declared present after the engine has been started and switched to LPG
mode.
Manipulate the wiring harness between the LPG computer and the LPG tank sender in order to produce a change
in status (present ↔ stored).
Look for any damage to the wiring harness and check the connection and condition of the LPG tank sender
connector.
Replace the connector if necessary.
For Mégane II: Disconnect the connector from the LPG tank sender and measure the resistance between tracks
A and C (only for Mégane 2).
Replace the sender if the resistance value is different to the value shown in the table below (only for Mégane 2).
Check for the presence of earth on track C (for Mégane 2) or track A3 (for Logan) of the LPG tank sender
connector.
Repair if necessary.
Check the insulation in relation to earth and the continuity and the absence of interference resistance on
the connection between:
For Mégane 2:
LPG computer track B1
For Logan:
LPG computer track D4track B, of the LPG tank sender
track A2, of the LPG tank sender
If the fault is still present, check the intermediate connectors (R2 track 36, for Mégane 2), (R34 track 8 and R345
track B, for Logan).
Repair if necessary.
If the fault is still present, deal with the other faults, then proceed to the conformity check.
AFTER REPAIRDeal with any faults displayed by the diagnostic tool.
Clear the computer memory.
Carry out a road test followed by another check with the diagnostic tool.
GAZ3000_V08_DF029 / GAZ3000_V10_DF029

17C-38
MR-372-J84-17C000$354.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF081
PRESENT
OR
STOREDCYLINDER 2 INJECTOR CIRCUIT
CO.0: Open circuit or short circuit to earth
CC.1: Short circuit to + 12 Volts
1.DEF: Non-compliance with emission control standards
IMPORTANT
When carrying out an operation on an LPG supply circuit component, consult the safety instructions
(see 17D, Gas injection, Introduction, Safety instructions for all operations).
NOTESPriority when dealing with a number of faults:
If fault DF021 LPG tank solenoid valve relay circuit is present or stored, deal with
this fault first.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present after the engine is started and switched to LPG mode
or when command AC020 Cylinder 2 injector is executed.
Manipulate the wiring harness between the LPG computer and Injector number 2 until there is a change in status.
(present ↔ stored).
Look for any damage to the wiring harness and check the connection and condition of injector 2 and its
connections.
If necessary, repair or replace the connector.
Measure the resistance of injector 2 between tracks 1 and 2.
Replace the injector if the resistance value of the injector at approximately 20°C is not between:
0.7 Ω < R < 1.45 Ω
Check for insulation against earth, continuity and absence of interference resistance for the following
connections:
For Mégane 2:
General relay track A5
Black intermediate connector (R37) track 6
LPG computer track G4
Black intermediate connector (R37) track 2
For Logan:
Injector 2 track 1
LPG computer track G4track 6 of the black intermediate connector (R37)
track 1of injector 2
track 2 of the black intermediate connector (R37)
track 2 of injector 2
track A1 of the double control relay unit
track 2 of injector 2
Repair if necessary.
AFTER REPAIRDeal with any faults displayed by the diagnostic tool.
Clear the computer memory.
Carry out a road test followed by another check with the diagnostic tool.
GAZ3000_V08_DF081 / GAZ3000_V10_DF081

17C-41
MR-372-J84-17C000$354.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF087
PRESENT
OR
STOREDCYLINDER 4 INJECTOR CIRCUIT
CO.0: Open circuit or short circuit to earth
CC.1: Short circuit to + 12 Volts
1.DEF: Non-compliance with emission control standards
IMPORTANT
When carrying out an operation on an LPG supply circuit component, consult the safety instructions
(see 17D, Gas injection, Introduction, Safety instructions for all operations).
NOTESPriority when dealing with a number of faults:
If fault DF021 LPG tank solenoid valve relay circuit is present or stored, deal with
this fault first.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present after the engine is started and switched to LPG mode
or when command AC018 Cylinder 4 injector is executed.
Manipulate the wiring harness between the LPG computer and Injector number 4 to produce a change in status.
(present ↔ stored).
Look for any harness damage, and check the condition and connection of injector no. 4 and its connectors.
If necessary, repair or replace the connector.
Measure the resistance of injector 4 between tracks 1 and 2.
The injector resistance value at approximately 20°C should be between:
0.7 Ω < R < 1.45 Ω
Replace the injector if necessary.
Check for insulation against earth, continuity and absence of interference resistance for the following
connections:
For Mégane 2:
General relay track 5
Black intermediate connector (R37) track 8
LPG Computer track H3
Black intermediate connector (R37) track 4
For Logan:
Injector 4 track 1
LPG Computer track H3track 8 of the black intermediate connector (R37)
track 1of injector 4
track 4 of the black intermediate connector (R37)
track 2 of injector 4
track A1 of the double control relay unit
track 2 of injector 4
Repair if necessary.
AFTER REPAIRDeal with any faults displayed by the diagnostic tool.
Clear the computer memory.
Carry out a road test followed by another check with the diagnostic tool.
GAZ3000_V08_DF087 / GAZ3000_V10_DF087

17C-43
MR-372-J84-17C000$354.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF088
PRESENT
OR
STOREDCYLINDER 3 INJECTOR CIRCUIT
CO.0: Open circuit or short circuit to earth
CC.1: Short circuit to + 12 Volts
1.DEF: Non-compliance with emission control standards
IMPORTANT
When carrying out an operation on an LPG supply circuit component, consult the safety instructions
(see 17D, Gas injection, Introduction, Safety instructions for all operations).
NOTESPriority when dealing with a number of faults:
If fault DF021 LPG tank solenoid valve relay circuit is present or stored, deal with
this fault first.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present after the engine is started and switched to LPG mode
or when command AC019 Cylinder 3 injector is executed.
Manipulate the wiring harness between the LPG computer and Injector number 3 to produce a change in status.
(present ↔ stored).
Look for any damage to the wiring harness and check the connection and condition of the injector and its
connections.
If necessary, repair or replace the connector.
Measure the resistance of injector 3 between tracks 1 and 2.
The injector resistance value at approximately 20°C should be between:
0.7 Ω < R < 1.45 Ω
Replace the injector if necessary.
Check for insulation against earth, continuity and absence of interference resistance for the following
connections:
For Mégane 2:
General relay track 5
Black intermediate connector (R37) track 7
LPG computer track H2
Black intermediate connector (R37) track 3
For Logan:
Injector 3 track 1
LPG computer track H2track 7 of the black intermediate connector (R37)
track 1of injector 3
track 3 of the black intermediate connector
track 2 of injector 3
track A1 of the double control relay unit
track 2 of injector 3
Repair if necessary.
AFTER REPAIRDeal with any faults displayed by the diagnostic tool.
Clear the computer memory.
Carry out a road test followed by another check with the diagnostic tool.
GAZ3000_V08_DF088 / GAZ3000_V10_DF088

17C-49
MR-372-J84-17C000$413.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF098
PRESENT
OR
STOREDCYLINDER 1 INJECTOR CIRCUIT
CO.0 : Open circuit or short circuit to earth
CC.1 : Short circuit to + 12 V
1.DEF : Non-compliance with emission control standards
IMPORTANT
For any operation on a component of the LPG supply circuit, consult the safety instructions (see 17D,
LPG injection, Introduction, Safety instructions for all operations).
NOTESPriority when dealing with a number of faults:
If fault DF021 LPG tank solenoid valve relay circuit is present or stored, deal with it first.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present after the engine is started and switched to LPG mode or when
command AC021 Cylinder 1 injector is executed.
Manipulate the wiring harness between the injection computer and the cylinder 1 injector in order to produce a change in
status
(present ↔ stored).
Look for any harness damage, and check the condition and connection points of the injector and its connections.
If necessary, repair or replace the connector.
Measure the resistance of injector 1 between tracks 1 and 2.
The injector resistance value at roughly 20 °C must be between:
0.77 Ω < R < 1.43 Ω
Replace the injector if necessary.
Check for insulation against earth, continuity and absence of interference resistance for the following connections:
For Mégane 2:
General relay track 5
Black intermediate connector (R37) track 5
LPG computer track G3
Black intermediate connector (R37) track 1
For Logan:
Injector 1 track 1
LPG computer track G3track 15 of the black intermediate connector (R37)
track 1 of injector 1
track 1 of the black intermediate connector (R37)
track 2 of injector 1
track A1 of the double relay control unit relay
track 2 of injector 1
Repair if necessary.
AFTER REPAIRDeal with any faults displayed by the diagnostic tool.
Clear the computer memory.
Carry out a road test followed by another check with the diagnostic tool.
GAZ3000_V08_DF098 / GAZ3000_V10_DF098