87B-64
MR-413-X44-87B000$432.mif
V5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
UCH
Vdiag No.: 44
87B
DF138
PRESENT
OR
STOREDALTERNATOR
1.DEF: Mechanical or electrical fault
2.DEF: Temperature fault
NOTESThe fault is declared present after:
Switching on the ignition, starting the engine and waiting 1 minute in the event of an
electrical or mechanical fault.
In the event of a temperature fault, run the engine until the engine cooling fans are
triggered.
Effect on system:
The fault is hidden for 3 seconds, the alternator voltage setpoint is 14.3 V and the on-
board network voltage is equal to 14.3 V if the alternator can still regulate. Regulation
resumes as soon as the fault disappears.
Effect on system:
The battery warning light comes on when the fault appears and goes out as soon as
the fault disappears.
Check for the presence, condition and fitting of the alternator belt. (See MR 411, Mechanical, 11A, Top and front
of engine, Accessories belt: Removal - Refitting).
Remove the accessories belt (MR411, Mechanical, 11A Top and front of engine, Accessories belt, Removal -
Refitting).
Check that the alternator pulley is not offset against its axis.
Check that the alternator pulley turns freely on its axis.
Check that the continuity and electrical insulation of the rotor coil is correct. Check that there is no sign of the rotor
overheating. (See MR 411, Mechanical 16A, Starting - Charging, Charging circuit: Check).
Perform a charging circuit test (see 80A, Battery).
If the fault is still present, replace the alternator (component code 103) (see MR 411, Mechanical 16A,
Starting - Charging, Alternator: Removal - Refitting).
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.
UCH_V44_DF138
