check engine RENAULT SCENIC 2008 J84 / 2.G Gas Injection LPG 3000 Repair Manual

17C-74
MR-372-J84-17C000$472.mif
V2
LPG 3000
Program No.
Vdiag No: 08/10GAS INJECTION
Fault finding - Conformity check17C
SUB-FUNCTION: OPERATION IN PETROL MODE
NOTESOnly perform this conformity check after a complete check with the diagnostic tool.
The values indicated in this conformity check are given as examples.
Application conditions: Engine running at idle speed at 80°C and Petrol mode
selected.
Order FunctionParameter or Status
checked or ActionDisplay and notes Fault finding
1
LPG / Petrol
switchET021:Mode selectedPETROL NONE
2ET094:Petrol modeNORMALCheck the consistency
between statuses
ET094 Petrol mode
and ET093 LPG mode.
If there is inconsistency,
contact the Techline.
3ET084:Forced petrol
mode, empty
tankNOIf YES, test the multiplex
network. If the multiplex
network is correct, check that
the LPG tank is full. If the tank
is full, apply the interpretation
of status ET084 Forced petrol
mode, tank empty.
4ET023:Forced Petrol
mode, LPG
faultNOIf YES, apply the interpretation
of status ET023 Forced petrol
mode, LPG fault.
5Petrol
injection
signalPR006: Engine speedIndicates the engine's speed
of rotation in rpm.
PR006 = 750 rpm
± 50 rpmIn the event of a fault, carry out
a full fault finding procedure on
the petrol injection system.
Deal with any other faults.
6Manifold
pressurePR001:Manifold
pressureIndicates the inlet manifold
vacuum pressure in mb.

17C-75
MR-372-J84-17C000$472.mif
V2
LPG 3000
Program No.
Vdiag No: 08/10GAS INJECTION
Fault finding - Conformity check17C
SUB-FUNCTION: OPERATION IN PETROL MODE (CONTINUED)
NOTESOnly perform this conformity check after a complete check with the diagnostic tool.
The values indicated in this conformity check are given as examples.
Application conditions: Engine running at idle speed at 80°C and Petrol mode
selected.
Order FunctionParameter or Status
checked or ActionDisplay and notes Fault finding
7Fuel pump ET025:Fuel pumpACTIVEACTIVE during
operation in petrol
mode. If there is
inconsistency, carry out
a full fault finding
procedure on the petrol
injection system. Deal
with any other faults
8
Petrol
injection
signalPR002:Coolant
temperatureIndicates the engine coolant
temperature in °C.
Check the consistency of the
temperatures by performing fault
finding on the petrol computer.In the event of a fault,
carry out a full fault
finding procedure on
the petrol injection
system. Deal with any
other faults.
9PR103:Air
temperatureIndicates the air temperature in °C.
Check the consistency of the
temperatures by performing fault
finding on the petrol computer.

17C-77
MR-372-J84-17C000$590.mif
V2
17C
GAS INJECTION
Fault finding - Interpretation of statuses
ET022
WAITING FOR LPG CONDITIONS
YES
NO
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).
NOTESThere must be no present or stored faults.
Ignition on, engine stopped.
Status ET022 indicates YES for a variable period during which the computer checks that the LPG system is
operating correctly.
Variable duration depending on:
–ET100 LPG system ready,
–PR002 Coolant temperature,
–PR103 Air temperature,
–PR113 LPG temperature.
Apply the interpretation of faults DF103 LPG expansion valve solenoid valve circuit and DF007 Main relay
circuit.
Manipulate the wiring harness between the LPG computer and the petrol computer until a change in status is
noted.
Check the insulation, continuity and the absence of interference resistance on the connections between:
For Mégane 2:
LPG computer track A1
LPG computer track A2
For Logan:
LPG computer track A1
LPG computer track A2track K3, connector B, petrol computer
track K4, connector B, petrol computer
track 25 of the fuel computer
track 26 of the fuel computer
Repair if necessary.
If the status is still not correct, contact the Techline.
AFTER REPAIRFollow the instructions to confirm repair.
GAZ3000_V08_ET022 / GAZ3000_V10_ET022
LPG 3000
Program No.
Vdiag No: 08/10
MR-372-J84-17C000$590.mif

17C-78
MR-372-J84-17C000$590.mif
V2
GAS INJECTION
Fault finding - Interpretation of statuses
LPG 3000
Program No.
Vdiag No: 08/10
17C
ET023
FORCED PETROL MODE, FAULTY LPG
YES
NO
NOTESThere must be no present or stored faults.
Ignition on, engine stopped.
Status ET023 indicates YES if a fault is detected in LPG mode when LPG mode is selected.
Check the insulation, continuity and absence of interference resistance on the connections between:
For Mégane 2:
LPG computer track A1
LPG computer track A2
For Logan:
LPG computer track A1
LPG computer track A2track K3, connector B, petrol computer
track K4, connector B, petrol computer
track 25 of the fuel computer
track 26 of the fuel computer
Repair if necessary.
If the status is still not correct, contact the Techline.
AFTER REPAIRFollow the instructions to confirm repair.
GAZ3000_V08_ET023 / GAZ3000_V10_ET023

17C-79
MR-372-J84-17C000$590.mif
V2
GAS INJECTION
Fault finding - Interpretation of statuses
LPG 3000
Program No.
Vdiag No: 08/10
17C
ET084
FORCED PETROL MODE WITH EMPTY TANK
YES
NO
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).
NOTESThere must be no present or stored faults.
Ignition on, engine stopped.
Special note
Check that there is LPG in the tank.
Check that there is no fault on the petrol injection computer.
Test the petrol injection computer (see 17B, Petrol injection).
Status ET084 indicates YES if the LPG tank is empty and LPG mode is selected.
Using parameters PR001 Manifold pressure and PR112 LPG pressure downstream of the expansion valve,
check that PR112 - PR001 = 800 mbar.
If PR112 - PR001 < 800 mbar, check:
–the LPG tank solenoid valve (see DF013 Tank solenoid valve circuit),
–the expansion valve,
–the LPG pressure downstream of the expansion valve (see PR112 LPG pressure downstream of
expansion valve).
Repair or replace the faulty components, if necessary.
If the status is still not correct, check:
–that the injectors are functioning correctly, using commands AC018 Cylinder 4 injector, AC019 Cylinder 3
injector, AC020 Cylinder 2 injector and AC021 Cylinder 1 injector,
–the condition of the hoses between the expansion valve and the injectors.
Repair the faulty components if necessary.
If the status is still not correct, contact the Techline.
AFTER REPAIRFollow the instructions to confirm repair.
GAZ3000_V08_ET084 / GAZ3000_V10_ET084

17C-80
MR-372-J84-17C000$590.mif
V2
GAS INJECTION
Fault finding - Interpretation of statuses
LPG 3000
Program No.
Vdiag No: 08/10
17C
ET095
LPG TO PETROL TRANSITION
YES
NO
NOTESThere must be no present or stored faults.
Ignition on, engine stopped.
Status ET095 indicates YES for a variable period during the transition from LPG to petrol mode.
Check that the fuel pump starts when petrol mode is entered.
Check that status ET025 Fuel pump becomes ACTIVE.
If the fuel pump does not start, check:
–the fuel pump cut-off relay (see DF024 Fuel pump cut-off relay circuit),
–the petrol computer (see 17B, Petrol injection).
Repair or replace the faulty components, if necessary.
If the status is still not correct, contact the Techline.
AFTER REPAIRFollow the instructions to confirm repair.
GAZ3000_V08_ET095 / GAZ3000_V10_ET095

17C-81
MR-372-J84-17C000$590.mif
V2
GAS INJECTION
Fault finding - Interpretation of statuses
LPG 3000
Program No.
Vdiag No: 08/10
17C
ET096
PETROL TO LPG TRANSITION
YES
NO
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).
NOTESThere must be no present or stored faults.
Ignition on, engine stopped.
Special note
The duration of the transition varies according to the outside temperature.
Status ET095 indicates YES for a variable period during the transition from LPG to petrol mode.
Check that the fuel pump starts when petrol mode is entered.
Check that status ET025 Fuel pump becomes ACTIVE.
If the fuel pump does not start, check:
–the fuel pump cut-off relay (see DF024 Fuel pump cut-off relay circuit),
–the petrol computer (see 17B, Petrol injection).
Repair or replace the faulty components, if necessary.
If the status is still not correct, contact the Techline.
AFTER REPAIRFollow the instructions to confirm the repair:
GAZ3000_V08_ET096 / GAZ3000_V10_ET096

17C-82
MR-372-J84-17C000$590.mif
V2
GAS INJECTION
Fault finding - Interpretation of statuses
LPG 3000
Program No.
Vdiag No: 08/10
17C
ET100
LPG SYSTEM READY
YES
NO
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).
NOTESThere must be no present or stored faults.
Ignition on, engine stopped.
Status ET100 indicates YES if no LPG fault is present.
Check:
–the LPG tank solenoid valve (see DF013 Tank solenoid valve circuit),
–the general relay (see DF007 Main relay circuit),
–the LPG expansion valve solenoid valve (see DF103 LPG expansion valve solenoid valve),
–the LPG pressure sensor (see DF092 Expansion valve downstream pressure sensor circuit),
–the LPG pressure in the tank (see DF031 LPG pressure downstream of expansion valve).
Repair or replace the faulty components, if necessary.
Check:
–the LPG filling hoses,
–the supply hoses upstream of the expansion valve,
–the expansion valve,
–the hoses downstream of the expansion valve.
Repair or replace the faulty components, if necessary.
If the status is still not correct, contact the Techline.
AFTER REPAIRFollow the instructions to confirm repair.
GAZ3000_V08_ET100 / GAZ3000_V10_ET100

17C-84
MR-372-J84-17C000$708.mif
V2
17C
GAS INJECTION
Fault finding - Interpretation of parameters
PR003
PRESSURE DIFFERENCE: LPG/ MANIFOLD
IMPORTANT
For an operation on a component of the LPG supply circuit, consult the safety instructions (see 17D,
Gas injection, Introduction, Safety instructions for all operations).
NOTESThere must be no present or stored faults.
Engine running in LPG mode.
Check that the pressure difference is 800 mbar.
Check the consistency in pressure difference using parameters PR001 Manifold pressure, PR003 Pressure
difference: LPG/manifold and PR112 LPG pressure downstream of expansion valve and ensure that
PR003 = PR112 - PR001.
If the fault is still present, manipulate the wiring harness between the manifold pressure sensor and the LPG
pressure/temperature sensor in order to produce a change in status.
Check the connection and condition of the manifold pressure sensor and the LPG pressure / temperature
sensor, and its connections.
If necessary, repair or replace the connector.
If the pressure difference is still inconsistent, apply the interpretation of fault DF031 LPG pressure downstream
of expansion valve.
If the fault is still present, replace the LPG pressure/temperature sensor (see MR 364 Mechanical, 17D,
LPG injection).
If the fault is still present, check the manifold pressure sensor by testing the Petrol computer (see 17B,
Petrol injection, Interpretation of faults).
If the fault is still present, contact the Techline.
AFTER REPAIRFollow the instructions to confirm repair.
GAZ3000_V08_PR003 / GAZ3000_V10_PR003
LPG 3000
Program No.
Vdiag No: 08/10
MR-372-J84-17C000$708.mif

17C-85
MR-372-J84-17C000$708.mif
V2
GAS INJECTION
Fault finding - Interpretation of parameters
LPG 3000
Program No.
Vdiag No: 08/10
17C
PR007
LPG TANK SENDER SIGNAL VOLTAGE
NOTESThere must be no present or stored faults.
Ignition on, engine stopped.
Using the LPG tank sender signal voltage value PR007 and measure the resistance, using a multimeter between
tracks A and C (for Mégane 2 ) or tracks A1 and A2 (for Logan).
Check the consistency between these values using the table below.
In the event of inconsistency, check for earth on track D or C (for Mégane 2 ) or track 3 or 4 (for Logan) of LPG
tank pressure sensor connector.
Repair if necessary.
Check the insulation against earth, continuity and the absence of interference resistance of the connections
between:
For Mégane 2:
LPG computer track A4
LPG computer track D3
For Logan:
LPG computer track B2
LPG computer track D3track A of the LPG tank sender
track C of the LPG tank sender
track A2 of the LPG tank sender
track A1 of the LPG tank sender unit
Repair if necessary.
Pressure sensor voltage
in V (± 0.5 V)Needle position
4Full
1Reserve
0Empty
AFTER REPAIRFollow the instructions to confirm repair.
GAZ3000_V08_PR007 / GAZ3000_V10_PR007