87G - 5
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Introduction
87G
V6 MR-372-J84-87G000$066_eng.mif
UPC
Vdiag No.: 44
Wiring check:
Fault finding problems:
Disconnecting the connectors and/or manipulating the wiring harness may temporarily remove the cause of a fault.
Electrical measurements of voltage, resistance and insulation are generally correct, especially if the fault is not
present when the analysis is made (stored fault).
Visual inspection:
Look for damage under the bonnet and in the passenger compartment.
Carefully check the protective parts, insulators and wiring harness routing.
Look for signs of oxidation.
Tactile inspection:
While manipulating the wiring harness, use the diagnostic tool to note any change in fault status from stored to
present.
Make sure that the connectors are properly tightened,
Apply light pressure to the connectors,
Twist the wiring harness.
If there is a change in status, try to locate the source of the fault.
Inspection of each component:
Disconnect the connectors and check the appearance of the clips and tabs, as well as their crimping (no crimping on
the insulating section).
Make sure that the clips and tabs are properly locked in the sockets.
Check that no clips or tabs have been dislodged during connection.
Check the clip contact pressure using an appropriate model of tab.
Resistance check:
Check the continuity of entire lines, then section by section.
Look for a short circuit to earth, the +12 V feed or with another wire.
If a fault is detected, repair or replace the wiring harness.
87G - 13
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
87G
V6 MR-372-J84-87G000$462_eng.mif
UPC
Vdiag No.: 44ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
DF002
PRESENT
HIGH SPEED FAN RELAY CONTROL CIRCUIT
CC.1 : Short circuit to +12 V
NOTESSpecial notes:
The function is inhibited when the fault is present.
Reactivating the function via a new ignition request.
Measure the resistance between tracks 1 and 2.
If the resistance is not 65 ΩΩ Ω Ω
± 10 ΩΩ Ω Ω
, replace the relay.
Take the relay out and make sure that it is insulated from the +12 V for the connection:
UPC connector PPM2 track 2 Track 2 of the fan relay connector
Repair if necessary.
If the fault is still present, check for the absence of +12 V on track 2 of the UPC connector PPM2.
If +12 V is present, contact the Techline.
AFTER REPAIRClear the computer memory.
Turn the ignition off and then on again, then run a new check using the fault finding tool
MR-372-J84-87G000$462_eng.mif
