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

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-83
MR-372-J84-17C000$649.mif
V2
17C
GAS INJECTION
Fault finding - Interpretation of parameters
Tool parameter Diagnostic tool title
PR001Manifold pressure
PR002Coolant temperature
PR003Pressure difference: LPG/ manifold
PR006Motor speed
PR007LPG tank sender signal voltage
PR012Engine speed multiplex signal
PR013LPG tank sender supply voltage
PR103Air temperature
PR110LPG injection duration
PR111LPG flow rate setpoint
PR112LPG pressure downstream of expansion valve
PR113LPG temperature
PR114Sensor supply voltage
PR116Sender resistance
LPG 3000
Program No.
Vdiag No: 08/10
MR-372-J84-17C000$649.mif

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

17C-86
MR-372-J84-17C000$708.mif
V2
GAS INJECTION
Fault finding - Interpretation of parameters
LPG 3000
Program No.
Vdiag No: 08/10
17C
PR112
LPG PRESSURE DOWNSTREAM OF EXPANSION VALVE
NOTESThere must be no present or stored faults.
Ignition on, engine stopped.
Check that the LPG pressure downstream of the expansion valve is not more than 800 mbar greater than the
manifold pressure PR001 Manifold pressure.
Check the pressure value 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 LPG computer and the LPG pressure/
temperature sensor to produce a status change.
Check the connection and condition of the LPG pressure/temperature sensor and its connections.
If necessary, repair or replace the connector.
Check for + 5V on track 1 (for Mégane 2) or track 3 (for Logan) of the LPG pressure/temperature sensor in LPG
mode. 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 A3
For Logan:
LPG computer track A3track 1 of the LPG temperature/pressure sensor
track 3 of the LPG temperature/pressure sensor
Repair if necessary.
Check for earth on track 3 (for Mégane 2) or track 1 (for Logan) of the LPG pressure/temperature sensor in
LPG mode.
Check the insulation in relation to + 12V and the continuity and absence of interference resistance on
the connection between:
For Mégane 2:
LPG computer track B3
For Logan:
LPG computer track B3track 3 of the LPG temperature/pressure sensor
track 1 of the LPG temperature/pressure sensor
Repair if necessary.
AFTER REPAIRFollow the instructions to confirm repair.
GAZ3000_V08_PR112 / GAZ3000_V10_PR112

17C-88
MR-372-J84-17C000$708.mif
V2
GAS INJECTION
Fault finding - Interpretation of parameters
LPG 3000
Program No.
Vdiag No: 08/10
17C
PR116
SENDER RESISTANCE
NOTESThere must be no present or stored faults.
Ignition on, engine stopped.
Special Note
For Logan: Ignore this parameter.
Use a multimeter to measure the resistance between tracks A and C (for Mégane 2) of the LPG tank sender.
Tank sender resistance
in Ω (± 2 Ω)Needle position
20 Full
290 Spare
320 Empty
AFTER REPAIRFollow the instructions to confirm repair.
GAZ3000_V08_PR116 / GAZ3000_V10_PR116

17C-90
MR-372-J84-17C000$826.mif
V2
17C
GAS INJECTION
Fault finding - Interpretation of commands
AC005
FUEL TANK SENDER RELAY
NOTESWith ignition on and engine stopped.
Switch on the ignition and run command AC005.
If the fuel sender relay does not click 10 times, carry out the fault finding procedure below.
Check the insulation, continuity and the absence of interference resistance on the connection between:
For Mégane 2:
LPG computer track E4
Fuel sender relay track B2
For Logan:
LPG computer track E4
Double relay control unit track B2Earth
Earth
Repair if necessary.
Check the insulation, continuity and the absence of interference resistance on the connection between:
For Mégane 2:
Fuel sender relay track B3
For Logan:
Double relay control unit track B3track B5 of the fuel sender relay
track B5 of the fuel pump relay
Repair if necessary.
If the fault is still present, replace the fuel sender relay (see MR 364 Mechanics, 17D, LPG injection).
AFTER REPAIRRepeat the conformity check from the start.
GAZ3000_V08_AC005 / GAZ3000_V10_AC005
LPG 3000
Program No.
Vdiag No: 08/10
MR-372-J84-17C000$826.mif

17C-91
MR-372-J84-17C000$826.mif
V2
GAS INJECTION
Fault finding - Interpretation of commands
LPG 3000
Program No.
Vdiag No: 08/10
17C
AC015
TANK SOLENOID VALVE
NOTESWith ignition on and engine stopped.
Switch on the ignition and run command AC015.
If the tank solenoid valve does not click ten times, carry out the fault finding procedure below.
Look for possible damage to the harness, and check the condition and connection of the LPG tank solenoid
valve and its connectors.
Repair if necessary.
Check the connection and condition of the LPG solenoid valve connector and its connections.
Replace the connector if necessary.
Check for +12 V on track 1 of the LPG tank relay and track C2 of the LPG computer.
Repair if necessary.
With the ignition on, check for earth on track 2 of the LPG tank solenoid valve relay.
If, with the ignition on, the computer does not control the LPG tank solenoid valve relay on track 2 through an
earth, contact the Techline.
–Check that the solenoid valve is supplied with +12 V by track E4 of the LPG computer.
If necessary, check the insulation, continuity and the absence of interference resistance on the connection
between:
For Mégane 2:
LPG computer track E4
For Logan:
LPG computer track E4track 2 of the LPG tank relay
track B2 of the double relay control unit
Repair if necessary.
AFTER REPAIRRepeat the conformity check from the start.
GAZ3000_V08_AC015 / GAZ3000_V10_AC015

17C-92
MR-372-J84-17C000$826.mif
V2
GAS INJECTION
Fault finding - Interpretation of commands
LPG 3000
Program No.
Vdiag No: 08/10
17C
AC015
CONTINUED
–Check for +12 V on track 5 of the LPG tank relay.
If necessary, check the following connections for insulation from earth, continuity and absence of extraneous
resistance:
For Mégane 2:
LPG computer track E3
LPG tank solenoid valve track D
For Logan:
LPG computer track E3
LPG tank solenoid valve track 1track 5 of the LPG tank relay
track B5 of the double relay control unit
Repair if necessary.
Check for earth on track E (for Mégane 2) or on track 2 (for Logan) of the LPG tank solenoid valve.
Repair if necessary.
With the engine running, check that the LPG tank solenoid valve clicks when the LPG mode is selected.
If the fault is still present, replace the LPG tank solenoid valve (see MR 364 Mechanics, 17D, LPG
injection).
AFTER REPAIRRepeat the conformity check from the start.

17C-93
MR-372-J84-17C000$826.mif
V2
GAS INJECTION
Fault finding - Interpretation of commands
LPG 3000
Program No.
Vdiag No: 08/10
17C
AC018
CYLINDER INJECTOR NO. 4
NOTESWith ignition on and engine stopped.
Switch on the ignition and run command AC018.
If the injector does not vibrate 10 times, perform the fault finding procedure for DF087 Cylinder 4 injector circuit.
AFTER REPAIRRepeat the conformity check from the start.
GAZ3000_V08_AC018 / GAZ3000_V10_AC018