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TECHNICAL NOTE 3419A
XXXX
DIESEL INJECTION
TURBOCHARGER
FAULT FINDING ASSISTANCE
This Technical Note deals with all turbocharged diesel injection engines
77 11 295 742
APRIL 2000
EDITION ANGLAISE
“The repair methods given by the manufacturer in this document are based on the
technical specifications current when it was prepared.
All copyrights reserved by Renault.
Reproduction or translation, in part or in full, of this document or use of the service part
reference numbering system is forbidden without the prior written authority of Renault.
The methods may be modified as a result of changes introduced by the manufacturer
in the production of the various component units and accessories from which his
vehicles are constructed.”
© RENAULT 2000
113
DIESEL INJECTION
Fault finding - Introduction
DIESEL INJECTION
Fault finding - Introduction
13
NOTES
Carry out a conformity check on the injection system, engine management system and engine using the fault finding
tool (see relevant fault finding sheets).
NOTE
: the turbocharger is very rarely the source of a lack of engine performance.
13-1
DIESEL INJECTION
Turbocharger fault finding assistance
13
Turbocharger fault finding assistance
The engine lacks power despite normal consumption and exhaust emissions (turbo)
Problem on the accelerator control.
Check that the stop position is obtained
with full pedal depression (problem with
the thickness of the carpet/mat) and
adjust the accelerator cable. Does the
fault persist after this operation?
no
End
yes
Check the condition of the air filter and
replace if necessary. Does the problem
persist after this operation?
no
End
yes
Incorrect sealing of the inlet circuit.
Check the air filter and the air/air
exchanger pipes. Does the fault persist
after this check?
Check the turbocharging pressure. Is the
pressure correct?
no
no
End
yes
yes
Faulty turbocharger. Replace the
turbocharger: no operation is possible on
the turbocharger or the load regulator
(except T2). Does the fault persist after
replacement?
Pipe between the manifold and the flow
corrector disconnected. Does the fault
persist after refitting?
yes
no
End
yes
no
End
Venting pipe under the flow corrector
diaphragm blocked. Does the fault
persist after repair?
no
End
yes
Faulty supply circuit. Check the supply and return pipes,
conformity of the filler cap, venting and cored screws on the pump.
Does the fault persist after checking/replacing?
no
End
yes
A
13-2
DIESEL INJECTION
Turbocharger fault finding assistance
13
The engine lacks power despite normal consumption
and exhaust emissions (turbo)
(continued)
A
Perform a test without filler cap. Does
the fault persist?
no
Fit an approved cap.
Does the fault persist after this operation?
no
yes
End
Check the loss of pressure in the circuit.
Measure the value of the vacuum
pressure at the filter outlet on the pump
side.
Is the vacuum pressure > 0.2 bar?
yes
no
yes
Measure the value of the vacuum
pressure at the filter inlet.
Is the value > 0.1 bar?
no
Check the upstream circuit.
Does the fault persist after this operation?
no
yes
yes
End
Change the fuel filter. Fit only an
original cartridge.
Does the fault persist
after replacement?
yes
Check the circuits.
Does the fault persist?
no
no
End
End
yes
Discharge pipes crushed at the
connections.
Check the condition of the internal
diameter of the tubes. Replace the faulty
parts. Does the problem persist?
no
End
yes
Check the injection pump and distribution
timing. Does the fault persist after
checking/adjusting?
no
End
yes
The injection pump is incorrectly adjusted.
Send it to a Renault Injection Centre.
13-3
DIESEL INJECTION
Turbocharger fault finding assistance
13
The engine lacks power and there is abnormal consumption and exhaust emissions (turbo)
Check the condition of the air filter and
replace if necessary. Does the problem
persist after this operation?
no
End
yes
Change the fuel filter. Fit only an
original cartridge.
Does the fault persist
after replacement?
no
End
yes
Check the conformity and condition of
the injectors (calibration/atomisation...).
Does the fault persist after checking and
possible replacement?
no
End
yes
Incorrect sealing of the inlet circuit.
Check the air filter and the air/air
exchanger pipes.
Does the fault persist after this check?
Check the turbocharging pressure.
Is the pressure correct?
no
no
End
yes
yes
Faulty turbocharger. Replace the
turbocharger: no operation is possible on
the turbocharger or the load regulator
(except T2). Does the fault persist after
replacement?
Pipe between the manifold and the flow
corrector disconnected. Does the fault
persist after refitting?
yes
no
yes
no
End
End
Venting pipe under the flow manifold
diaphragm blocked. Does the fault
persist after repair?
no
End
yes
A
13-4
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