2000 Citroen C5 fuel pressure

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INJECTION
CHECKS : LOW PRESSURE FUEL SUPPLY CIRCUIT
Engines : RHY - RHZ - 4HX
Engines : RHY - RHZ
Engine : 4HX
TOOLS
[1] Ø 10 mmlow pressure connector: 4215-T.
[2] Ø 8 mmlow pressure connector: 4218 -T.
[3] Pressure gauge for testing boost pressure : 4073-T Tool kit 4073-T
[4] Extension: 4251-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.
NOTE : To check the pressures while the vehicle is being driven, insert tool[4] Between
tool[3] and tools[1] et[2].
Checks on pressure : static.
- Switch on ignition
- For 3 seconds(normal functioning):
- Fuel supply pressure shown by the pressure gauge [3] = 2.6 ± 0.4 Bar.
- Fuel return pressure shown by the pressure gauge [3] = 0.6 ± 0.4 Bar.
B1BP20JDB1BP27BD

Downloaded from www.Manualslib.com manuals search engine 125
INJECTION
CHECKS : LOW PRESSURE FUEL SUPPLY CIRCUIT
Engines : RHY - RHZ - 4HX (continued)
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] = 0.8 ± 0.4 Bar.
Abnormal functioning
Impossible to start the engine :
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)Check : diesel injector return flow. (Table below)
Uncouple the diesel injector return pipe.
Fuel supply pressure Fuel return pressure Checks
Between 3.3et 4 Bars 0.8 ± 0.4 BarCheck the condition of the diesel filter
More than 4 Bars
More than 4 BarsLess than 0.8 Bar
More than 0.8 BarCheck the low pressure regulator incorporated in
the filter (locked shut) : replace.
Check the fuel return circuit (pipe pinched or trapped...).
Between 0.8et 1.5 BarLess than 0.8 BarCheck the fuel suppy circuit :
- Booster pump(low pressure), piping.
Check :
Observe :
The flow should be drop by drop
Diesel injector functioning correctly
Excessive fuel return
Diesel injector locked shut.

Downloaded from www.Manualslib.com manuals search engine FEATURES OF MULTIPOINT INJECTION SYSTEM
Summary
(1) Air pump
(2) Power steering pressure sensor
(3) Engine management ECU
(4) Canister purge electrovalve
(5)Butterfly housing
(6)Idle regulation stepper motor
(7) Inlet air temperature sensor
(8)Inlet housing heater element
(9)Butterfly potentiometer
(10)Automatic gearbox (Option)
(11)Built-in systems interface
(12) Transponder
(13)Diagnostic connector
(14) Ignition injection test warning lamp
(15)Battery
(16)Immobiliser unit
(17) Air conditioning
(18) Instrument panel
(19)Fuel tank
(20)Fuel pump, gauge and filter assembly(21)Canister reservoir
(22) Downstream oxygen sensor
(23)Upstream oxygen sensor
(24)Air inlet valve
(25)EGR electrovalve
(26)Camshaft position sensor
(27) Ignition coil
(28)Sparking plug
(29) Injector supply rail
(30)Injectors
(31) Air inlet pressure sensor
(32) Engine coolant temperature sensor
(33) Engine speed sensor
(34)Cooling fan unit
(35) Knock sensor
B1HP1C5P
139
INJECTION

Downloaded from www.Manualslib.com manuals search engine 140
INJECTION
FEATURES OF MULTIPOINT INJECTION SYSTEM
Fuel circuit
Air inlet circuit
(diagr.) Component Supplier Reference Observations
30
4
19
21
20
7
31
6
5
9Recommended fuel
Petrol injector
Canister purge electrovalve
Fuel tank
Canister reservoir
Fuel pump and gauge assembly
with integral fuel filter
Air temperature sensor
Air inlet pressure sensor
Idle regulation stepper motor
Butterfly housing
PotentiometerSAGEM
BOSCH
SAGEM (1)
SOLVAY
MGI
MARWAL
MAGNETI
MARELLI
BOSCH
MGI
MAGNETI
MARELLI (1)
MGI
MAGNETI
MARELLI280520274
IAT S04
0261230034
B13 (1)Unleaded 95 RON or 98 RON
2 way black connector. Resistance : 12,2 ohms
2 way brown connector. Installation : between the engine
fusebox and the brake amplifier
Capacity = 66 Litres
Installation : in the rear LH wheelarch
6 way black connector. Pressure : 3,5 Bars.
2 way grey connector, fixed on the butterfly housing
3 way grey connector integral with the inlet manifold.
4 way black connector, fixed on the butterfly housing
The butterfly housing comprises the inlet air temperature
sensor, the butterfly potentiometer, the electric motor.
3 way black connector, installed on the butterfly housing.
(1) = RFNengine

Downloaded from www.Manualslib.com manuals search engine FEATURES OF MULTIPOINT INJECTION SYSTEM
Summary
1)Accelerator pedal position sensor
(2)Denox catalyser downstream oxygen sensor
(3)Denox catalyser
(4)Downstream exhaust gas temperature sensor
(5)3-function precatalyser
(6)Precatalyser upstream oxygen sensor
(7) Upstream exhaust gas temperature sensor
(8)Petrol pressure regulator
(9)Petrol high pressure pump
(10)Knock sensor
(11) EGR electrovalve
(12)Canister purge electrovalve
(13)Motorised butterfly housing
(14)Canister reservoir
(15)Fuel pump and tank assembly
(16) Fuel tank
(17)Inlet air temperature sensor
(18) Inlet air pressure sensor(19)Engine coolant temperature sensor
(20) Sparking plug
(21) Ignition coil block
(22) High pressure injector
(23) Engine oil temperature sensor
(24)Engine speed sensor
(25)Inlet camshaft dephaser electrovalve
(26) Camshaft position sensor
(27)Petrol high pressure sensor
(28) Power steering pressure sensor
(29) Aircon fluid pressure sensor
(30)Cooling fan unit
(31)ABS block
(32)Clutch pedal sensor
(33)Brake pedal sensor
(34)Air conditioning ECU
(35) Engine management ECU
(36)Built-in systems interface BSI
(37)Rev counter
(38) Coded immobiliser
(39)Vehicle cruise control
(40) Diagnostic connector
B1HP1C6P
143
INJECTION

Downloaded from www.Manualslib.com manuals search engine 144
INJECTION
FEATURES OF MULTIPOINT INJECTION SYSTEM
Fuel circuit
(diagr.) Component Supplier Reference Observations
8Petrol pressure regulator
22Petrol injector
27Petrol high pressure sensor
11Canister purge electrovalve
16Fuel tank
14Canister reservoir
15Fuel pump and gauge assembly
17Air temperature sensor
13Butterfly housing
13Butterfly housing motor
13Butterfly potentiometer
18Inlet air pressure sensor2 way brown connector, located on the petrol injection
common rail.
2 way orange connector, resistance : 1,88 ohms.
3 way black connector, located on the petrol injection
common rail.
2 way brown connector.
Capacity = 66 Litres.
Installed inside the rear LH wheelarch.
6 way black connector, pressure : 5 bars, integrated
fuel filter.
2 way grey connector, resistance : 2,05 kohms
The butterfly housing comprises :
Inlet air temperature sensor, butterfly potentiometer, electric
motor.
6 way black connector.
3 way grey connector, fixed under the air inlet manifold. SIEMENS5403
5048
5402
280520274
IAT S04
98023100 BOSCH
SOLVAY
MGI
MARWAL
MAGNELI
MARELLI
MGI
MAGNELI
MARELLI
BOSCHAir inlet circuit

Downloaded from www.Manualslib.com manuals search engine 147
INJECTION
FEATURES OF BOSCH ME 7.4.6 MULTIPOINT INJECTION SYSTEM
Summary
(1) Rev counter
(2)Consumption information
(3)Ignition injection test warning lamp
(4) Air conditioning ECU (according to equipment)
(5)Multifunction screen
(6)Built-in systems interface (BSI)
(7) Transponder
(8)Automatic gearbox ECU(according to equipment)
(9 Pump, fuel filter and pressure regulator assembly
(10)Battery
(11)Pressostat
(12)Engine speed sensor
(13)Camshaft position sensors (x2)
(14)Motorised butterfly housing
(15)Canister purge electrovalve
(16)Cooling fan unit
(17)Pencil type ignition coils (x2)
(18) Petrol injectors (x6)(19) Variable timing electrovalves (x2)
(20)Upstream oxygen sensors (x2)
(21) Downstream oxygen sensors (x2)
(22)Engine coolant thermal sensor
(23) Knock sensors (x2)
(24)Power steering pressure sensor
(25) Integral pressure sensor
(26)Accelerator pedal position sensor
(27)Inlet air thermal sensor
(28) Diagnostic connector
(29) Multifunction double relay
(30) Ignition injection ECU
B1HP1B2P

Downloaded from www.Manualslib.com manuals search engine 149
INJECTION
FEATURES OF BOSCH ME 7.4.6 MULTIPOINT INJECTION SYSTEM
Fuel circuit
(diagr.) Component Supplier Reference Observations
Recommended fuel
33Fuel tank
9Pump, fuel filter and pressure
regulator assembly
34Canister reservoir
15Canister purge electrovalve
18Petrol injector
31Pulse damper
25Integral pressure sensor
14Motorised butterfly housing
26Accelerator pedal position
sensorSuper unleaded 95 RON or 98 RON
Capacity = 66 Litres, polyethylene.
Electric pump immersed in the tank, voltage = 12 V,
Bars, Flow = 115 at 120 l/h, regulation pressure = 3,5 Bars.
Located under front LH wing.
Electrovalve normally closed. 2 way brown connector, located
under the front LH wing, resistance = 24 ohms.
Group of injectors 1.2.3: 2 way brown connector.
Group of injectors 4.5.6 : 2 way yellow connector, injector
with 4 jets. Resistance = 16 ohms.
Installed on the timing cover, equipped with a SCHRAEDER
valve.
2 way black connector, incorporated in the air inlet manifold.
Double potentiometer, supply = 5 Volts, fixed on the engine
compartment. MARWAL
PURFLUX
BOSCH
BOSCHPPGF 30
0 280142 317
EV 8 E
0280155613
0280161500
DS-S2
0261260140
Air circuit