88B-15
V1
MR-453-X79-88B000$050.mif
MULTIPLEXING
Fault finding – Fault Finding Chart
88B
ALP 1
CONTINUED 3
Check the following connections on the diagnostic socket:
BP 56 + Battery
MAN and NC Earth
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace the wiring.
Computer connected to multiplex line V
If the fault is still present, check the continuity and the insulation of the following connections:
Multiplex line H (133B of component 225).
Multiplex line L (133C of component 225).
Use a multimeter to check that the voltages at the terminals of component 225 are approximately:
– 2.5 V between CAN H (133B) and earth (MAN and NC) (Average values)
– 2.5 V between CAN L (133C) and earth (MAN and NC) (Average values).
Refer to the Introduction - Repair advice to detect a short circuit on the vehicle's multiplex network.
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