Inspection Procedures For Trouble Symptoms; No Communication With Mut-Ii; Lights Left On Reminder Warning Function Not Working Normally - Mitsubishi Electric Lancer Evolution-VII Workshop Manual

54B-10
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure A-1

No communication with MUT-II

Either the ETACS-ECU power supply circuit system or the harness or connector
between the diagnosis connector and ETACS-ECU may be defective.
Is communication by MUT-II possible when the ignition switch
is ON?
Is communication, by MUT-II, possible with other systems?
Measure at the ETACS-ECU connector C-228.
D Disconnect the connector and test on the junction box
side.
D Continuity between terminal 56 and body earth.
OK : Continuity confirmed.
Check the following connectors:
<L.H. drive vehicles> C- 228, C- 26, C- 22
<R.H. drive vehicles> C-228, C-28, C-22
OK
Check the trouble
symptoms.
NG
Check the harness between ETACS-ECU and diagnosis
connector.
Replace ETACS-ECU.
NOTE:
When failure is detected on the harness between ETACS-ECU and the body earth, check No. 3 terminal
(C-226) of ETACS-ECU as well. Repair, if required.
Inspection Procedure B-1
Lights left ON reminder warning function not working
normally.
The ETACS-ECU controls the headlamp automatic cut-off function based on input
signals from the following switches.
D Ignition switch (IG1)
D Driver's door switch
D Tail lamp switch
D Headlamp switch
Do all of the following functions operate when the ignition
switch is in the LOCK (OFF) position?
D Central locking
D Hazard lamps
Check the MUT-II input signals.
D Ignition switch (IG1)
D Driver's door switch
D Tail lamp switch
D Headlamp switch
Replace ETACS-ECU.
SWS -
YES
NO
OK
NG
Repair
OK
YES
OK
Troubleshooting
Probable cause
D Harness or connector fault
D ETACS-ECU fault
NO
Check the MUT-II diagnosis circuit, and repair if necessary.
YES
Check ETACS-ECU battery power circuit system (Refer to
P.54B-33, Inspection Procedure K-1).
NG
Check the following connectors: C-228, C-08
OK
Check the trouble
symptoms.
NG
Check the harness between ETACS-ECU and the body earth,
and repair if necessary.
NG
Repair
Probable cause
D Driver's door switch fault
D Column switch fault
D ETACS-ECU fault
D Harness or connector fault
NO
Check ETACS-ECU battery power circuit system (Refer to
P.54B-33, Inspection Procedure K-1).
NG
Check the defective input circuit. (Refer to P.54B-7, Defects
Found by Input Signal Check).
NG
Repair