sensor RENAULT SCENIC 2008 J84 / 2.G Gas Injection LPG 3000 User Guide

17C-46
MR-372-J84-17C000$354.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF092
CONTINUED
Replace the sensor if the pressure is no more than 0.8 bar greater than the manifold pressure PR001 Manifold
pressure.
Check the manifold pressure sensor sealing.
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, 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.

17C-47
MR-372-J84-17C000$413.mif
V2
17C
GAS INJECTION
Fault finding - Interpretation of faults
DF095
PRESENT
OR
STOREDLPG TEMPERATURE SENSOR CIRCUIT
1.DEF : Signal outside lower limit
2.DEF : Signal outside upper limit
3.DEF : Non-compliance with emission control standards
IMPORTANT
Before working on an LPG supply circuit component, always refer to the appropriate section of the
Workshop Repair Manual (see 17D, LPG Injection, Introduction, Safety advice 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 temperature/pressure sensor in order to
produce a change in status (present to stored).
Look for any damage to the harness, and check the connection and condition of the LPG pressure/temperature
sensor and its connectors.
If necessary, repair or replace the connector.
Check for + 5 V on track 3 of the LPG pressure/temperature sensor in LPG mode.
Check the following connections for insulation from earth, continuity and absence of extraneous resistance:
LPG computer track A3 track 3 of the LPG pressure/temperature sensor
Repair if necessary.
Check for earth on track 1 of the LPG pressure/temperature sensor in LPG mode.
Check the following connections for insulation from +5 V, continuity and absence of extraneous resistance:
LPG computer track B3 track 1 of the LPG pressure/temperature sensor
Repair if necessary.
Check the insulation, the continuity and absence of unwanted resistance on the connection between:
LPG computer track E2 track 2 of the LPG pressure/temperature sensor
Repair if necessary.
Measure the resistance of the temperature sensor.
Replace the sensor if the resistance is not: 2.5 kΩ ± 0.1 kΩ at 20 ˚C
1.2 kΩ ± 0.1 Ω at 40 ˚C
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_DF095 / GAZ3000_V10_DF095
LPG 3000
Program No: AB
Vdiag No: 08/10
MR-372-J84-17C000$413.mif

17C-48
MR-372-J84-17C000$413.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF096
PRESENT
OR
STOREDSENSOR SUPPLY VOLTAGE
1.DEF : Voltage outside permitted range of values
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 has been running for 10 seconds in
LPG mode.
Manipulate the wiring harness between the LPG computer and the LPG temperature/ pressure sensor in order to
produce a change in status (present ↔ stored).
Look for any damage to the harness, and check the connection and condition of the LPG pressure/temperature
sensor and its connectors.
If necessary, repair or replace the connector.
Check for + 5 V on track A4 and A3 (for Mégane 2) and on track B2 and A3 (for Logan) and for earth on
track B3 and D3 (for Mégane 2) or tracks G1 and H1 (for Logan) of the LPG computer.
Repair if necessary.
If incorrect, contact the Techline.
Check for a supply on tracks A3 and A4 of the LPG computer.
The voltage value must be between:
4.8 < V < 5.2
Check the insulation and continuity of the following connections:
For Mégane 2:
LPG computer track A4
LPG computer track A3
For Logan:
LPG computer track B2
LPG computer track A3track B of the LPG tank sender
track 1 of the LPG pressure sensor
track A2 of the LPG tank sender
track 3 of the LPG pressure sensor
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_DF096 / GAZ3000_V10_DF096

17C-54
MR-372-J84-17C000$472.mif
V2
17C
GAS INJECTION
Fault finding - Conformity check
MAIN SCREEN
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 stopped, ignition on and LPG mode selected.
Order FunctionParameter or Status
checked or ActionDisplay and notes Fault finding
1Main relay ET049:General relayINACTIVEIn the event of a fault,
apply the interpretation
of DF007 Main relay circuit.
2
Petrol/LPG
mode
consistencyET021:Mode selectedLPG NONE
3ET094:Petrol modeNORMALCheck the consistency
between statuses
ET094 Petrol mode
and ET093 LPG mode.
If there is inconsistency,
contact the Techline. 4PR093:LPG modeNO
5
Engine speedPR006:Engine speedPR006 = 0 mph
(0 km/h)In the event of a fault, carry out
a full fault finding procedure on
the petrol injection system.
Deal with any other faults.
6PR012:Engine speed
multiplex signalPR012 = 0 mph
(0 km/h)In the event of a fault,
apply the interpretation
of DF074 TDC signal circuit.
7LPG switch ET105:LPG switchPRESSED
RELEASEDIn the event of a fault, apply
the interpretation
of DF020 Fuel sender
switching relay circuit.
8Sensor voltage PR114:Sensor feed
voltage4.9 V < PR114 < 5 VIn the event of a fault, apply
the interpretation of DF096
Sensor supply voltage.
GAZ3000_V08_CCONF / GAZ3000_V10_CCONF
LPG 3000
Program No.
Vdiag No: 08/10
MR-372-J84-17C000$472.mif

17C-61
MR-372-J84-17C000$472.mif
V2
LPG 3000
Program No.
Vdiag No: 08/10GAS INJECTION
Fault finding - Conformity check17C
SUB-FUNCTION: OPERATION IN LPG MODE (CONTINUED 1)
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 condition: Engine stopped, ignition on and LPG mode selected.
Order FunctionParameter or Status
checked or ActionDisplay and notes Fault finding
5Manifold
pressurePR001:Manifold
pressureIndicates the inlet manifold
vacuum pressure in mb.
PR001 = atmospheric
pressureIn the event of a fault, carry
out a full fault finding
procedure on the petrol
injection system. Deal with
any other faults.
6
LPG pressurePR003:Pressure
difference: LPG/
manifoldCalculation of the
difference between LPG
pressure and manifold
pressure in mb.
PR003 ≈ 800 mbarCheck that:
PR112 - PR001 = PR003
7PR112:LPG pressure
downstream of
expansion valveIndicates the LPG pressure
downstream of the
expansion valve in mb.
PR112 = PR001 + 800 mbarIn the event of a fault, apply
the interpretation of
DF092 Expansion valve
downstream LPG
pressure sensor circuit
and DF017 LPG leak
detection downstream
of expansion valve.

17C-65
MR-372-J84-17C000$472.mif
V2
LPG 3000
Program No.
Vdiag No: 08/10GAS INJECTION
Fault finding - Conformity check17C
MAIN SCREEN
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 LPG mode
selected.
Order FunctionParameter or Status
checked or ActionDisplay and notes Fault finding
1Main relay ET049:General relayACTIVEIn the event of a fault,
apply the interpretation
of DF007 Main relay circuit.
2
Petrol/LPG
mode
consistencyET021:Mode selectedLPG NONE
3ET094:Petrol modeNORMAL
Then NOCheck the consistency between
statuses ET094 Petrol mode
and ET093 LPG mode.
If there is inconsistency, contact
the Techline. 4PR093:LPG modeNO
Then YES
5
Engine speedPR006:Engine speedPR006 = 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.
6PR012:Engine speed
multiplex signalPR012 = 0 mph (0 km/h)In the event of a fault, apply the
interpretation of
DF074 TDC signal circuit.
7LPG switch ET105:LPG switchPRESSED In the event of a fault, apply
the interpretation of DF020 Fuel
sender switching relay circuit.
8Sensor
voltagePR114:Sensor feed
voltage4.9 V < PR114 < 5 VIn the event of a fault, apply
the interpretation of
DF096 Sensor supply voltage.
GAZ3000_V08_CCONF

17C-71
MR-372-J84-17C000$472.mif
V2
LPG 3000
Program No.
Vdiag No: 08/10GAS INJECTION
Fault finding - Conformity check17C
SUB-FUNCTION: OPERATION IN LPG 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 LPG mode
selected.
Order FunctionParameter or Status
checked or ActionDisplay and notes Fault finding
1
LPG / Petrol
switchET021:Mode selectedLPG NONE
2ET093:LPG modeYESCheck the consistency
between statuses
ET094 Petrol mode
and ET093 LPG mode.
If there is inconsistency,
contact the Techline.
3Petrol
injection
signalsPR006: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.
4LPG
expansion
valve
solenoid
valveET106:LPG
expansion
valve solenoid
valveOPENThe LPG expansion valve
solenoid valve must be OPEN
in LPG operation with the
engine running and CLOSED
in petrol operation. If there is
inconsistency, apply the
interpretation of DF103 LPG
expansion valve solenoid
valve circuit.
5Manifold
pressurePR001:Manifold
pressureIndicates the inlet manifold
vacuum pressure in mb.In the event of a fault, carry out
a full fault finding procedure on
the petrol injection system.
Deal with any other faults.
6
LPG pressurePR003:Pressure
difference:
LPG/ manifoldCalculation of the difference
between LPG pressure
and manifold pressure
in mb.
PR003 ≈ 800 mbarCheck that:
PR112 - PR001 = PR003
7PR112:LPG pressure
downstream of
expansion
valveIndicates the LPG pressure
downstream of the
expansion valve in mb.
PR112 = PR001 + 800 mbarIn the event of a fault, apply the
interpretation of
DF092 Expansion valve
downstream LPG pressure
sensor circuit and
DF017 LPG leak detection
downstream of expansion
valve.

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