62B-84
MR-413-X44-62B000$874_eng.mif
V1
Vdiag No.: 44CLIMATE CONTROL
Diagnostic - Fault finding chart62B
ALP 8
CONTINUED 5
Check the air conditioning compressor belt tension
(see Technical Note 3786A, Engine and
peripherals, 10A, Belt tension setting tool Hz
measurement: tension values).
Is the tension correct?
YES
With the engine stopped, use the diagnostic tool to
run command AC180 Air conditioning
compressor relay (injection command mode
menu).
Does the compressor clutch jam?
YES
E
NOReplace the belt (see MR 411
Mechanical, 11A, Top and front of
engine, Accessories belt: Removal -
Refitting).
NOConnect a test light between connections 38R
and MAS of component 171 and run
command AC180 Air conditioning
compressor relay.
Does the test light illuminate?
NO
Connect a test light between connection 38R
of component 171 and the chassis earth, then
run command AC180 Air conditioning
compressor relay.
Does the test light illuminate?
YES
Earth fault on component 171.
If there is a repair procedure
(see Technical Note 6015A,
Repairing electrical wiring,
Wiring: Precautions for
repair), repair the wiring,
otherwise replace it.
NO
F
YES
Check the condition of the
diode (component 322).
Replace the diode if it is faulty.
Replace the air conditioning
clutch (component 171) if
possible, otherwise replace
the compressor (see MR 411
Mechanical, 62A, Air
conditioning, Compressor:
Removal - Refitting).
AFTER REPAIRCarry out a complete check with the diagnostic tool.
62B-87
MR-413-X44-62B000$874_eng.mif
V1
Vdiag No.: 44CLIMATE CONTROL
Diagnostic - Fault finding chart62B
ALP 9 Too much cold air
NOTESOnly deal with this customer complaint after a full check with the diagnostic tool
(fault reading and configuration checks).
Check that the fuses are sound.
Use a multimeter and a 21 W test light.
Use the Wiring Diagram Technical Note, NEW TWINGO.
With the engine running at idle speed and air conditioning switched off (AC button not pressed and no AUTO
mode), check that the air conditioning compressor clutch is not engaged.
Is the air conditioning compressor
clutch engaged?NO
YES
With the engine stopped, check that the compressor clutch electric control operates correctly, using the
diagnostic tool to run command AC180 Air conditioning compressor relay (injection command mode menu).
–During the command, connection 38R of component 171 must be supplied with + 12 V.
–After the command, connection 38R of component 171 must no longer be supplied with + 12 V.
Is the connection still supplied with + 12 V after the command?
YES NO
Check the continuity and insulation from + 12 V of
connection 38R between components 171 and 584.Check that the air conditioning compressor clutch is
not jammed (mechanical fault).
Is the connection OK? Is the clutch still engaged?
NO YES YES
If there is a repair procedure
(see Technical Note 6015A,
Repairing electrical wiring,
Wiring: Precautions for repair),
repair the wiring, otherwise
replace it.With the vehicle ignition off, check
that the compressor clutch relay is
not “jammed”, by checking the
continuity between connection
38R and connection AP3 of
component 584.
Is the continuity present?
NO
Apply the fault finding procedure for
command AC180 Air conditioning
compressor relay (see 13B Diesel
injection or 17B Petrol injection).
Is the fault still present?
Replace the air conditioning
compressor (see MR 411,
Mechanical, 62A, Air
conditioning, Compressor:
Removal - Refitting).
YES Replace the air
conditioning
compressor clutch
relay.
AFTER REPAIRCarry out a complete check with the diagnostic tool.
