2005 CITROEN C6 check engine

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INJECTION
CHECKS: LOW PRESSURE FUEL SUPPLY CIRCUIT
Engine: DT17BTED4
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 Kit 4073-T
[4]Extension: 4251-T
Checks.
IMPERATIVE : Respect the safety and cleanliness requirements specific to high pressure
diesel injection (HDi) engines.
Connect the tool [1]between the booster pump and the fuel filter (white mark 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 on the fuel return pipe.
Connect the tool [3]on tool [1]or on tool [2].
WARNING: Any check of pressure downstream of the fuel filter is prohibited.
NOTE:To check the pressures while the vehicle is being driven, insert the extension [4] between
tool [3]and tools [1]or [2].
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INJECTION
CHECKS: LOW PRESSURE FUEL SUPPLY CIRCUIT
Engine: DT17BTED4
Checks on pressure: static.
Switch on the ignition.
For 3 seconds(normal functioning):
- Fuel supply pressure shown by the pressure gauge[3] = 1.1 ± 0.4 bar.
- Fuel return pressure shown by the pressure gauge [3] = 2 ± 0.5 bar.
Abnormal functioning:
Fuel supply Fuel return
Checks
pressure pressure
Between 2and 3 bar 0.8 ± 0.4 barCheck the condition of the diesel fuel filter
More than 3 barMore than 0.8 barCheck the fuel return circuit (pipe pinched)
Between
Less than 0.8 barCheck the fuel suppy circuit :
0.3and 0.5 barBooster pump (low pressure), piping
Impossible to start the engine:
- Fuel supply pressure less than 0.3 bar.
B1BP3CRD
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INJECTION
CHECKS: TURBO PRESSURE
Engine: DT17BTED4
Tools.
[1]Pressure gauge for checking the pressure: 7073-T.A
[2]Tool for checking the inlet air pressure/vacuum: (-).0171.G3
[3] LEXIAdiagnostic tool: 4171-T
[4] PROXIAdiagnostic tool: 4165-T
Checks.
IMPERATIVE: Respect the safety and cleanliness specific to high pressure diesel injection
engines.
Preliminary operations.
WARNING: Prior to any intervention, check the connections of the turbocharger pressure
regulation actuators.
NOTE:If an air flow fault is memorised by the diagnostic tool, refer to the chapter "Air flow from
the turbochargers".
Turbo pressure sensor.
Remove the engine cover.
Disconnect the connector "a".
Remove the turbo pressure sensor (1).
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INJECTION
CHECKS: TURBO PRESSURE
Engine: DT17BTED4
Connect:
- The tool [2a]in place of the turbo pressure sensor (1).
- The turbo pressure sensor (1)on the tool [2b].
- Tool [1]on tool [2], at "b".
Connect the diagnostic tool [3]or [4]to the vehicle's diagnostic socket:
- Put the diagnostic tool [3]or [4]in parameter measures.
Start the engine.
Accelerate to 2500 rpm.
Compare the pressure values read on the diagnostic tool and on the pressure gauge [1].
NOTE:If there is a significant difference in pressure, replace the turbo pressure sensor.
Air/air exhanger.
Check the condition of the following components:
- Air inlet pipe.
- Airoutlet pipe.
- Air /air exchanger.
Air flow from the turbochargers.
NOTE: If an air flow fault is memorised by the diagnostic tool, check the air flow from the turbocharger
incriminated.
Connect the diagnostic tool [3]or [4]to the vehicle's diagnostic socket:
- Put the diagnostic tool [3]or [4]in parameter measures.
Start the engine.
Accelerate to 2500 rpm.
Compare the air flows (mg/stroke)from the two turbochargers.
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INJECTION
CHECKS: TURBO PRESSURE
Engine: DT17BTED4
Significant difference in pressure between the two turbochargers:
- Stop the engine.
- Remove the air filter with the two flowmeters.
- Mark the flowmeters "d"and "c".
- Remove both flowmeters.
Refit:
- Flowmeter "d"in place of flowmeter "c".
- Flowmeter "c"in place of flowmeter "d".
Start the engine.
Accelerate to 2500 rpm.
Compare the air flows (mg/stroke)from the two turbochargers:
- If the difference in air flow has changed turbochargers, replace the flowmeter that is faulty.
- If the difference in air flow is coming from the same turbocharger, check the condition of the air inlet
and outlet pipes of this turbocharger: replace or repair the parts that are faulty.
- If no anomaly is detected on the air inlet and outlet pipes of the turbocharger: replace the turbocharger.
B1HP24TC
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INJECTION
CHECKING THE AIR SUPPLY CIRCUIT SPECIFICATIONS
Engine: DT17BTED4
(1) Air filter: MECAPLAST
(2)Air/air heat exchanger: BEHR
(3) Front turbocharger: GARETT
(4)Air butterfly housing: MAN HUMEL
(5)Rear turbocharger: GARETT
(6)Flowmeters: SIEMENS VDO
B1HP26UD
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INJECTION
CHECKING THE AIR SUPPLY CIRCUIT
Tool.
[1]Manual pressure-vacuum pump : FACOM DA 16
Checks.
IMPERATIVE: Respect the safety and cleanliness specific to high pressure
diesel injection engines.
Checking the vacuum source (vacuum pump).
Connect the tool [1]on the take-off "a"of the vacuum pump (1).
Start the engine.
The value should be 0,85 ± 0,2 bar.
"Swirl" control electrovalve.
Connect the tool [1]on the vacuum supply "b"of the electrovalve (2).
Start the engine.
The value should be 0,85 ± 0,2 bar.
"Swirl" control diaphragm.
Connect the tool [1]on the "Swirl"control diaphragms (3)at "c".
Apply a vacuum of approx. 0,7 ± 0,2 bar, the "Swirl"butterfly should be fully
open.
Engine: DT17BTED4
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B1HP26FC
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CLUTCH
GEARBOX
TRANSMISSION
SPEEDOMETER
An E.E.C. decree of 25 June 1976, regulates the speed displayed by the speedmeter in relation to the actual speed travelled.
This decree stipulates:
- The speed indicated by a speedometer must never be lower than the actual vehicle speed.
- Between the speed displayed «SD»and the speed travelled «ST», there must always be the following relationship:
ST < SD < 1.10 ST + 4 Kph
Example:For an actual speed of 100 Kphthe speed displayed by the speedometer may be between 100and 11 4 K p h.
The speed indicated by the speedometer may be influenced by:
- The speedometer.
- The tyres fitted to the vehicle.
- The final drive ratio.
- The speedometer drive ratio.
Any of these components can be checked without removing them from the vehicle (see information note N° 78-85 TT of 19 October 1978).
NOTE:Before replacing the speedometer, check the conformity of the following points:
- The tyres fitted to the vehicle.
- The gearbox final drive ratio.
- The speedometer drive ratio.
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