ECU RENAULT SCENIC 2008 J84 / 2.G Gas Injection LPG 3000 Workshop Manual

17C-3
MR-372-J84-17C000$059.mif
V2
GAS INJECTION
Fault finding - Introduction
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
Faults
Faults are declared either present or stored (depending on whether they appeared in a certain situation and have
disappeared since, or whether they remain but have not been diagnosed within the current context).
The present or stored status of faults should be taken into consideration when the diagnostic tool is switched on
following + after ignition feed being activated (without any system components being active).
For a present fault, apply the procedure described in the Interpretation of faults section.
For a stored fault, note the faults displayed and apply the Notes section.
If the fault is confirmed when the instructions in the Notes section are applied, the fault is present. Deal with the
fault.
If the fault is not confirmed, check:
●the electrical lines which correspond to the fault,
●the connectors for these lines (for oxidation, bent pins, etc.),
●the resistance of the component detected as faulty,
●the condition of the wires (melted or split insulation, wear).
Conformity check
The aim of the conformity check is to check data that does not produce a fault on the diagnostic tool because the
data is inconsistent. Therefore, this phase makes it possible to:
●run fault finding on faults that do not have a fault display, and which may correspond to a customer complaint,
●check that the system is operating correctly and that there is no risk of a fault recurring after repairs.
This section gives the fault finding procedures for the statuses and the parameters and the conditions for checking
them.
If a status is not behaving normally or a parameter is outside the permitted tolerance values, consult the
corresponding fault finding page.
Customer complaints - Fault finding chart
If the test with the diagnostic tool is OK but the customer complaint is still present, the fault should be treated by
Customer complaints.
A summary of the overall procedure to follow is provided on the following page in the
form of a flow chart.

17C-18
MR-372-J84-17C000$354.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF013
PRESENT
OR
STOREDTANK SOLENOID VALVE CIRCUIT
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 or fault DF018 + After ignition
feed supply or fault DF016 Impact detected are present or stored, deal with these
faults 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 AC015 Tank solenoid valve is executed.
Manipulate the wiring harness between the gas computer and the gas tank solenoid valves 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 solenoid
valves and their connections.
Repair if necessary.
Check the connection and condition of the LPG tank solenoid valve relay connector and its connections.
Replace the connector if necessary.
–check that the solenoid valve is supplied with +12V via track E3 of the LPG computer.
–check for + 12V on track D (for Mégane 2) or on track A (for Logan) of the LPG tank solenoid valve.
If necessary, check the insulation to earth and the continuity and absence of interference resistance on
the following connections:
For Mégane 2:
LPG tank solenoid valve track D
For Logan:
LPG tank solenoid valve track Atrack B5 of the LPG tank solenoid valve relay
track E3, LPG computer
track B5 of the LPG tank solenoid valve relay
track E3, LPG computer
If the fault is still present, check the intermediate connectors (R2 track 38, for Mégane 2), (R34 track 9,
for Logan).
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_DF013 / GAZ3000_V10_DF013

17C-21
MR-372-J84-17C000$354.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF016
PRESENT
IMPACT DETECTED
1.DEF: Impact detected
2.DEF: Non-compliance with emission control standards
NOTESPriority when dealing with a number of faults:
If faults DF021 LPG tank solenoid valve relay circuit or fault DF018 + After ignition
feed supply are present or stored, deal with these faults first.
Special note:
As soon as the LPG computer receives this signal, engine operation is prohibited.
If the vehicle has been involved in an accident:
Carry out any necessary repairs,
–clear the fault,
–switch off the ignition,
–wait for the engine immobiliser indicator light to flash,
–switch on the ignition,
If the fault does not recur, end the fault finding procedure.
If the fault recurs, carry out fault finding on the AIRBAG computer.
If the vehicle has not been involved in an accident:
Check for + 12V on track 3 of the fuel pump cut-off relay and the LPG tank 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_DF016P / GAZ3000_V10_DF016

17C-25
MR-372-J84-17C000$354.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF020
PRESENT
OR
STOREDFUEL SENDER SWITCHING RELAY CIRCUIT
CC.1: Short circuit to + 12 Volts
CO.0: Open circuit or short circuit to earth
2.DEF: Non-compliance with emission control standards
NOTESConditions 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 AC005 Fuel sender relay is executed.
Manipulate the wiring harness between the LPG computer and the fuel sender relay in order to produce a change
in status (present ↔ stored).
Look for possible damage to the wiring harness and check the connection and condition of the fuel sender relay
and its connections.
Repair if necessary.
Check the continuity and insulation of the following connection:
Fuel sender relay track 5 track E3, LPG computer
Replace the fuse if necessary.
With the ignition on, check for +12V on track C1 of the LPG computer.
Check the insulation in relation to earth and the continuity and the absence of interference resistance on
the connection between:
LPG computer track C1 track B1 of the LPG or petrol selector switch
If the fault is still present, check the intermediate connector (R34 on track 7, for Mégane 2 and R212 on
track B6, for Logan).
Repair if necessary.
Check the insulation in relation to earth and the continuity and the absence of interference resistance on
the connection between:
LPG computer track E4 track 2 of the fuel sender relay
Repair if necessary.
In LPG operation, check for earth on track 2 of the fuel sender relay.
If, with the ignition on, the computer does not control the fuel sender relay on track 2 via an earth, contact
the Techline.
If the fault is still present, replace the fuel sender 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_DF020 / GAZ3000_V10_DF020

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

17C-50
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
CONTINUED
With the ignition on,
–check for +12 V on track 1 of injector 1,
–check for earth on track 2 of injector 1 when command AC021 Cylinder 1 injector is executed.
Repair if necessary.
If the fault is still present, contact the Techline.
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.

17C-52
MR-372-J84-17C000$413.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF103
PRESENT
OR
STOREDLPG EXPANSION VALVE SOLENOID VALVE 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 AC024 LPG expansion solenoid valve is executed.
Manipulate the wiring harness between the LPG computer and the LPG expansion valve solenoid valve in order
to produce a change in status (present ↔ stored).
Look for possible damage to the harness, and check the condition and connection of the LPG expansion valve
solenoid valve and its connectors.
Repair if necessary.
Measure the resistance between tracks 1 and 2 of the LPG expansion valve solenoid valve.
Replace the solenoid valve if the resistance is not approximately 12.6 Ω ± 1.3Ω .
Check the following connections for insulation from earth, continuity and absence of extraneous resistance:
For Mégane 2:
LPG expansion valve solenoid valve track 1
For Logan:
LPG expansion valve solenoid valve track 1
Intermediate connector (R674) track 1track 5 of the main relay
Intermediate connector (R674) track 1
track A3 of the main 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_DF103 / GAZ3000_V10_DF103