AUTOMATIC TRANSMISSION
23A
23A - 156V3 MR-372-J84-23A000$945.mif
AJ0 BVA
Vdiag No.: 04, 05AUTOMATIC TRANSMISSION
Fault finding - Fault Finding Chart
ALP1 No dialogue with the computer
NOTESSpecial notes:
Only consult this customer complaint after a multiplex network check using the
diagnostic tool.
Make sure that the vehicle + after ignition feed is activated. Check the presence and condition of the UPC automatic
transmission fuses.
Check that the tool is not the cause of the fault, by attempting dialogue with a different system (UCH, Injection,
etc.) on the same vehicle or another vehicle.
Carry out another multiplex network test on the vehicle using the diagnostic tool:
Is the automatic transmission computer recognised?
NO YES
Check that the computer connector is properly
connected and check the condition of its
connections.
Check for the automatic transmission supply fuse on
the passenger compartment connection unit, and its
condition.
Check the battery voltage:
9.5 V < battery voltage < 15.5 V
Carry out the necessary operations to obtain a
correct voltage: Carry out a full check on the battery
and the charging circuit (see Technical
Note 6014A, Charging circuit check).
Establish dialogue with the automatic transmission
computer.
Communication successful at first attempt?
NO YES
Is the identification
screen displayed
after 3 attempts?
End of fault finding.
AFTER REPAIRDeal with any faults detected by the diagnostic tool. Clear the computer memory.
Carry out a road test, then check with the diagnostic tool.
AJ0_V04_ALP01/AJ0_V05_ALP01
MR-372-J84-23A000$945.mif
