Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 941

22A-34
MANUAL TRANSMISSION - Troubleshooting <ACD>
Inspection procedure 4
More than two ACD mode indicator lamps remain lit even
after the engine starts
The output circuit of the ACD mode indicator lamp may be faulty.
NOTE
This phenomenon occurs only when communication with the MUT-II is possible (4WD-ECU power supply
fault) and at the same time, no diagnostic code (no trouble code) is output.
Do all the ACD mode indicator lamps go off when 4WD-ECU
connector C-43 is disconnected?
Replace the 4WD-ECU.
Inspection procedure 5
ACD does not operate (No diagnosis code)
Insufficient operating oil, oil leakage, faulty operations of the oil pressure unit, and
faulty operations of the ACD transfer may be suspected.
NOTE:
1. This malfunction is restricted to only when no diagnostic code (no trouble code) is output.
2. *: Refer to GROUP 22B.
Check the transfer oil (P.22A-40).
Check the fluid (P.22A-41).
Check the operations of the ACD (P.22A-42).
NG
Check the hydraulic pressure (P.22A-43).
Have foreign particles mixed into the oil pressure line?
YES→Repair
Replace the ACD transfer.*
YES
OK
OK
OK
NO
Probable cause
D Harness or connector fault
D 4WD-ECU fault
D ACD mode indicator lamp assembly fault
NO
Check the following connectors:
<L.H. drive vehicles> C-43, C-128, C-01
<R.H. drive vehicles> C-43, C-01
NG→Repair
Check the trouble symptoms.
Check the harness between the ACD mode indicator lamp
assembly and 4WD-ECU.
D Check for ground and short circuit of output line.
NG→Repair
Replace the ACD mode indicator lamp assembly.
Probable cause
D Leakage of transfer oil
D Insufficient transfer oil
D Leakage of oil pressure line
D Insufficient fluid
D Hydraulic unit fault
D ACD transfer fault
NG
Check for leakage of the transfer oil.
NG→Repair
Replenish transfer oil.
NG
Check for leakage of the oil pressure line.
NG→Repair
Replenish the fluid.
OK
Check the trouble symptoms.
NG
Perform bleeding (P.22A-42).
Check the trouble symptoms.
Replace the oil pressure unit.
OK
NG
OK
OK
OK
NG
NG