2005 Citroen C4 pressure

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ENGINE
CHECKING THE OIL PRESSURE
To be read with the Petrol and Diesel correspondence tables
XSARA PICASSO
Engine type NFV 6FZ RFN 9HZ 9HY RHY
Temperature (°C) 90°C 80°C 90°C
Pressure (bars) 3,3 1,5 1,3 2
Rpm 1000
Pressure (bars) 3
Rpm 2000
Pressure (bars) 5
Rpm 3000
Pressure (bars) 4 6,3 3,5 4
Rpm 4000 4000
Tools (Toolkit 4103-T)
2279-T.Bis X X X X X X
4103-T X X X X X X
7001-T X
4202-T X X X
1503-J X X
NOTE: The oil pressure should be checked with the engine hot, after the oil level has been checked.
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INJECTION
CHECKS: LOW PRESSURE FUEL SUPPLY CIRCUIT
Tools.
[1] Ø 10 mmlow pressure connector: 4215-T
[2]Pressure gauge for testing boost pressure: 4073-T.A Toolkit 4073-T
IMPERATIVE: Respect the safety and cleanliness specific to high pressure diesel injection
engines.
Link tools [1]and [2] in series between the fuel high pressure pump and the fuel filter.
ESSENTIAL: Check that the tool [2] is clean.
Check the negative pressure according to the table below:
Vacuum Observations
10 ± 5 cmHgEngine driven by the starter motor
20 ± 5 cmHgEngine running under full load
60 ± 5 cmHgSupply circuit obstructed
(full tank strainer, piping, fuel filter)
B1BP2WHC
Engines: 8HX - 8HZ
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INJECTION
CHECKS: LOW PRESSURE FUEL SUPPLY CIRCUIT
Tools.
[1] Ø 10 mmlow pressure connector: 4215-T
[2]Pressure gauge for testing boost pressure: 4073-T.A Toolkit 4073-T
IMPERATIV: Respect the safety and cleanliness specific to high pressure diesel injection
engines.
Remove the air filter duct.
Link tool [1]in series, downstream of the injectors, between the fuel high pressure pump and the
fuel filter at «a»and «b».
WARNING: Any checking of pressure downstream of the fuel filter is prohibited.
Switch on the ignition.
Check the pressure :
Vacuum measured by the pressure gauge [2]:
Vacuum Observations
10 ± 0,5 cmHgEngine driven by the starter motor.
20 ± 0,5 cmHgEngine running under full load
60 ± 0,5 cmHgSupply circuit obstructed
(full tank strainer, piping, fuel filter)
B1CP0GFD
Engines: 9HX - 9HY - 9HZ
C4
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INJECTION
CHECKS: LOW PRESSURE FUEL SUPPLY CIRCUIT
Tools.
[1] Ø 10 mm low pressure connector: 4215-T
[2] Pressure gauge for testing boost pressure: 4073-T.A Toolkit 4073-T
IMPERATIVE: Respect the safety and cleanliness specific to high pressure diesel injection
engines.
Remove the air filter duct.
Link tool [1]in series, downstream of the injectors, between the fuel high pressure pump and the
fuel filter at «a»and «b».
WARNING: Any checking of pressure downstream of the fuel filter is prohibited.
Switch on the ignition.
ESSENTIAL: Check that the tool [2] is clean.
Check the negative pressure according to the table below:
Vacuum Observations
10 ± 05 cmhgEngine driven by the starter motor
20 ± 20 cmhgEngine running under full load
60 ± 05 cmhgSupply circuit obstructed
(full tank strainer, piping, fuel filter
B1BP2PHC
Engines: 9HZ - 9HY
XSARA PICASSO
Angl.-t2-page283-305-2005 9/01/06 10:18 Page 285

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INJECTION
CHECKS: LOW PRESSURE FUEL SUPPLY CIRCUIT
Tools.
[1] Ø 10 mmlow pressure connector: 4215-T
[2]Pressure gauge for testing boost pressure: 4073-T.A Toolkit 4073-T
IMPERATIVE: Respect the safety and cleanliness specific to high pressure diesel injection
engines.
Link tools [1] and [2]in series between the fuel high pressure pump and the fuel filter.
ESSENTIAL: Check that the tool [2] is clean.
Normal vacuum values.
Engine driven by the starter motor: 10 ± 0,5 cmHg.
Engine running under full load: 20 ± 10 cmHg.
Abnormal vacuum values.
Supply circuit obstructed
(full tank strainer, piping, fuel filter): 60 ± 20 cmHg.
B1BP33RD
Engine: RHR
C4
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INJECTION
CHECKS: LOW PRESSURE FUEL SUPPLY CIRCUIT
Tools.
[1] Ø 10 mmlow pressure connector: 4215-T
[2] Pressure gauge for testing boost pressure: 4073-T.A Toolkit 4073-T
Checks.
IMPERATIVE: Respect the safety and cleanliness specific to high pressure diesel injection
engines.
Link tools [1]and [2]in series between the fuel high pressure pump and the fuel filter.
ESSENTIAL: Check that the tool [2] is clean.
Vacuum Observations
10 ± 05 cmhgEngine driven by the starter motor
20 ± 20 cmhgEngine running under full load
60 ± 05 cmhgSupply circuit obstructed
(full tank strainer, piping, fuel filter)
B1BP2KUC
Engine: RHY
XSARA
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INJECTION
CHECKS: LOW PRESSURE FUEL SUPPLY CIRCUIT
Tools.
[1] Ø 10 mm low pressure connector: 4215-T
[2] Ø 8 mmlow pressure connector: 4218-T
[3]Pressure gauge for testing boost pressure: 4073-T Kit 4073-T
Connect the tool [1]between the booster pump and the fuel filter
(white mark at "a" on the fuel
supply pipe).
Connect the tool [2]downstream of the diesel injectors, between the high pressure fuel pump and
the fuel filter
(green mark at "b" on the fuel return pipe).
WARNING: Any check of pressure downstream of the fuel filter is PROHIBITED.
Checks on pressure: static.
- Switch on ignition.
For 3 seconds
(normal functioning):
- Fuel supply pressure shown by the pressure gauge [3] = 1.8 ± 0.4 bar.
- Fuel return pressure shown by the pressure gauge [3] = 0.5 ± 0.4 bar.
B1BP1TWD
Engines: RHY - RHZ
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INJECTION
CHECKS: LOW PRESSURE FUEL SUPPLY CIRCUIT
Checks on pressure: dynamic.
Engine running, at idle (normal functioning):
- Fuel supply pressure shown by the pressure gauge [3] = 2 ± 0.4 bar.
- Fuel return pressure shown by the pressure gauge [3] = 0.7 ± 0.4 bar.
Abnormal functioning
Fuel supply pressure Fuel return pressure Checks
Between 3and 3.5bar0.7 ± 0.2 bar Check the condition of the diesel filter
More than 3.5bar Less than 0.7barCheck the low pressure regulator incorporated
in the filter
(locked shut): replace.
More than 3.5bar More than 0.7barCheck the fuel return circuit
(pipe pinched or trapped…)
Between 0.8and 1.5bar Less than 0.7barCheck the fuel supply circuit:
- Booster pump (low pressure), piping
Impossible to start the engine:Check: diesel injector return flow
(table below).Fuel supply pressure less than 0.8 bar:
- Check the low pressure regulator incorporated in the filter (locked open).- Check the high pressure pump distribution valve (locked shut).Uncouple the diesel injector return pipe.
Check: Observe:
The flow should be drop by drop Diesel injector functioning correctly
Excessive fuel return Diesel injector locked shutEngines: RHY - RHZ (continued)
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