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

17C-5
MR-372-J84-17C000$059.mif
V2
GAS INJECTION
Fault finding - Introduction
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
4. FAULT FINDING PROCEDURE (continued)
Wiring check
Fault finding problems
Disconnecting the connectors and/or manipulating the wiring harness may temporarily remove the cause of a fault.
Electrical measurements of voltage, resistance and insulation are generally correct, especially if the fault is not
present when the analysis is made (stored fault).
Visual inspection
●look for damaged wiring under the bonnet and in the passenger compartment.
●carefully check the fuses, insulation and the correct routing of the wiring.
●look for signs of oxidation.
Tactile inspection
While manipulating the wiring harness, use the diagnostic tool to note any change in fault status from stored to
present.
●Make sure that the connectors are properly locked.
●Apply light pressure to the connectors.
●Twist the wiring harness.
If there is a change in status, try to locate the source of the fault.
Inspection of each component
●disconnect the connectors and check the appearance of the clips and tabs, as well as the crimping (no
crimping on the insulating section).
●make sure that the clips and tabs are properly locked in the sockets.
●Check that no clips or tabs have been dislodged during connection.
●check the clip contact pressure using an appropriate model of tab.
Resistance check
●check the continuity of the entire lines, then section by section.
●look for a short circuit to earth, to + 12V or with another wire.
If a fault is detected, apply the associated fault finding procedure and repair or replace the wiring.

17C-16
MR-372-J84-17C000$354.mif
V2
17C
GAS INJECTION
Fault finding - Interpretation of faults
DF003
PRESENT
OR
STOREDENGINE SPEED CONSISTENCY
1.DEF: Signal incoherent
2.DEF: Non-compliance with emission control standards
NOTESConditions for applying fault finding procedures to stored faults:
The fault is declared present after the engine has been running for 10 seconds in
LPG mode.
Appearance conditions:
The fault appears when the difference between the hard-wired petrol computer engine
speed signal and the multiplex network engine speed is greater than 300 rpm.
Manipulate the wiring between the LPG computer and the petrol computer 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 computer and its
connections and carry out the same checks on the injection computer.
Repair if necessary.
Check the insulation and continuity on the wires of the following multiplex connections:
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 petrol computer
track 26 of the petrol computer
Repair if necessary.
Check the insulation, continuity and the absence of interference resistance on the connection between:
LPG computer track F1 track C3, connector B, of the petrol computer
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_DF003 / GAZ3000_V10_DF003
LPG 3000
Program No: AB
Vdiag No: 08/10
MR-372-J84-17C000$354.mif

17C-17
MR-372-J84-17C000$354.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF007
PRESENT
OR
STOREDMAIN RELAY CIRCUIT
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 started and switched to LPG
mode.
Manipulate the wiring harness between the LPG computer and the main relay in order to produce a change in
status.
Look for any damage to the wiring harness and check the connection and condition of the main relay and its
connections (present ↔ stored).
If necessary, repair or replace the connector.
With the ignition on, check for +12V on track 1 and track 3 of the main relay.
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 the insulation in relation to + 12V and the continuity and absence of interference resistance on
the connection between:
LPG computer track F4 track 2 of the main relay
Repair if necessary.
With the ignition on, check for earth on track 2 of the main relay.
If, with the ignition on, the computer does not control the main relay on track 2 via an earth, contact the Techline.
With the engine running, check that the relay clicks when LPG mode is selected.
Replace the main relay 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_DF007 / GAZ3000_V10_DF007

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-19
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
CONTINUED
Check for earth on track E (for Mégane 2) or on track B (for Logan) of the LPG tank solenoid valve.
Repair if necessary.
With the engine running, check that the LPG tank solenoid valve relay clicks when LPG mode is selected.
If the fault is still present, check the insulation in relation to +12 V and the continuity and absence
of interference resistance on the following connections:
LPG computer track E4 track 2 of the LPG tank solenoid valve relay
Repair if necessary.
With the ignition on, check for + 12 volts on track C2 of the LPG computer.
Check the insulation in relation to + 12V and the continuity and absence of interference resistance on
the connection between:
LPG computer track C2 track 1 of the LPG tank solenoid valve relay
Repair if necessary.
With the ignition on, check that the relay and the fuel pump are supplied with + 12V.
Check the insulation in relation to + 12V and the continuity and absence of interference resistance on
the connection between:
For Mégane 2:
Fuel pump relay track 2
For Logan:
Fuel pump relay track B5track 3 of the LPG tank solenoid valve relay
track 3 of the LPG tank solenoid valve relay
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.

17C-24
MR-372-J84-17C000$354.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF019
PRESENT
OR
STOREDLPG PRESSURE SENSOR CIRCUIT
CC.0: Short circuit to earth
CO.1: Open circuit or short circuit to + 12V
1.DEF: Non-compliance with emission control standards
NOTESSpecial note:
The fault is declared present when the ignition is switched on.
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 wiring harness and 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 3 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:
LPG computer track A3 track 3 of the LPG temperature/pressure sensor
Repair if necessary.
Check for earth on track 1 of the LPG temperature/pressure sensor in LPG mode.
Check the insulation in relation to + 12V and the continuity and absence of interference resistance on
the connection between:
LPG computer track B3 track 1 of the LPG temperature/pressure sensor
Repair if necessary.
Check the insulation, continuity and the absence of interference resistance on the connection between:
LPG computer track C3 track 4 of the LPG temperature/pressure sensor
Repair if necessary.
Replace the sensor if the LPG pressure is not greater than 2 bar in relation to 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, 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_DF019 / GAZ3000_V10_DF019

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-27
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
CONTINUED
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 E4
For Logan:
LPG computer track E4track 2 of the gas tank solenoid valve relay
track B2 of the double control relay unit
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.
With the engine running, check that the relay clicks when LPG mode is selected.
If the fault is still present, replace the LPG tank solenoid valve 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.

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