Mitsubishi Lancer (4A9 engine). Manual - part 219

ETACS

CHASSIS ELECTRICAL

54A-538

STEP 7. M.U.T.-III data list
Check the power supply fuse voltage.

• Ignition switch: OFF

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Replace the ETACS-ECU.

STEP 8. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU.

NO : 

The trouble can be an intermittent 
malfunction (GROUP 00 

− How to use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

Code No.B2206 Chassis No. mismatch

CAUTION

If the diagnosis code No. B2206 is set, always 
diagnose the CAN bus line.
DIAGNOSTIC FUNCTION
If the registered chassis number is different from the 
chassis number transmitted on the CAN bus lines, 
the ETACS-ECU sets the diagnosis code No. B2206.

JUDGEMENT CRITERIA
If the chassis number registered to ETACS-ECU and 
the chassis number on CAN bus lines do not match, 
the ETACS-ECU determines that a problem has 
occurred.

PROBABLE CAUSES

• Chassis number not written

• Malfunction of the ETACS-ECU

• Malfunction of engine ECU

• Malfunction of CAN bus line

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ). On completion, go 

to Step 3.

STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the engine-ECU.

Q: Is the diagnosis code set?

YES : 

Troubleshoot the engine (Refer to GROUP 

13A 

− Troubleshooting  <1600> or GROUP 

13B 

− Troubleshooting  <1800-PETROL-

DOHC, 2000> or GROUP 13C 

− 

Troubleshooting  <DIESEL> or GROUP 13F 
− Troubleshooting  <1800-SOHC>).

NO : 

Go to Step 3.

STEP 3. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(1) Write the chassis number to the ETACS-ECU.
(2) Erase the diagnosis code.
(3) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(4) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace with the coded ETACS-ECU.

NO : 

The diagnosis is complete.

Item No.

Item name

Normal 
condition

Item 253

Voltage sensing 
of IOD Line

System voltage

ETACS

CHASSIS ELECTRICAL

54A-539

Code No.B2215 ECU internal error

JUDGMENT CRITERIA
When the ETACS-ECU internal error count reaches 
"255," the diagnosis code No. B2215 is set.

PROBABLE CAUSES

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

Replace the ETACS-ECU.

Code No.B222C Coding not completed

JUDGMENT CRITERIA
If the ETACS-ECU is in the initial state or the variant 
coding is incomplete, the ETACS-ECU sets the diag-
nosis code No. B222C.

PROBABLE CAUSES

• Variant code not written

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

M.U.T.-III diagnosis code
Check again if the diagnosis code is set to the 
ETACS-ECU.
(1) Perform the variant coding to the ETACS-ECU.
(2) Erase the diagnosis code.
(3) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(4) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace with the coded ETACS-ECU.

NO : 

The diagnosis is complete.

ETACS

CHASSIS ELECTRICAL

54A-540

Code No.B2353 Ignition power supply (low input)

 

Code No.B2354 Ignition power supply (high input)

CAUTION

Before replacing the ECU, ensure that the input and output signal circuits are normal.

TROUBLE JUDGEMENT
These diagnosis codes are set when the IG voltage 
decreases to the specified value or less (code No. 
B2353) or increases to the specified value or more 
(code No. B2354). However, when the status returns 
to normal, the code Nos. B2353 and B2354 are auto-
matically erased.

ETACS-ECU Power Source Circuit

ETACS-ECU

Wire colour code 
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue 
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple     SI : Silver

FUSIBLE 
LINK

34

44

FUSIBLE 
LINK

36

38

RELAY BOX 

ENGINE 
COMPARTMENT

NOTE

PETROL

:

DIESEL

:

AC701240

AO

Connector: C-317 <LHD>

ETACS-ECU

AC701241

AC

Connector: C-317 <RHD>

ETACS-ECU

ETACS

CHASSIS ELECTRICAL

54A-541

COMMENTS ON TROUBLE SYMPTOM
The power supply circuit or the ETACS-ECU may 
have a problem.

PROBABLE CAUSES

• Malfunction of power supply circuit

• Malfunction of battery

• Malfunction of alternator

• Malfunction of harness

• Malfunction of the ignition switch

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Check the IG voltage.

• Turn the ignition switch to the ON position.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 2.

STEP 2. Battery check
Refer to GROUP 54A 

− Battery Test .

Q: Is the battery in good condition?

YES : 

Go to Step 3.

NO : 

Charge or replace the battery.

STEP 3. Charging system check
Refer to GROUP 16 

− Charging System .

Q: Is the charging system in good condition?

YES : 

Go to Step 4.

NO : 

Repair or replace the charging system 
component(s).

STEP 4. Connector check: C-317 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

STEP 5. Voltage measurement at the C-317 
ETACS-ECU connector.
(1) Measure by backprobing without disconnecting 

the connector.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between the C-317 ETACS-

ECU connector terminal No. 6 and the body 
earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 6.

STEP 6. Wiring harness check between the C-317 
ETACS-ECU connector terminal No. 6 and the 
ignition switch (IG1)
Check the power supply line for open circuit and 
short circuit.

Q: Is the check result normal?

YES : 

Refer to Inspection Procedure 2 

"Malfunction of the ignition switch power 
supply system." 

NO : 

Repair the wiring harness.

STEP 7. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU.

NO : 

The trouble can be an intermittent 
malfunction (GROUP 00 

− How to use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

DATA LIST REFERENCE TABLE

M1545001300624

NOTE: Some items are not displayed on M.U.T.-III 
according to the information in the ECU.

Item No.

Item name

Normal 
condition

Item 254

IG voltage

System voltage

Item No. M.U.T.-III display

Check condition

Normal condition

1

CAN-H voltage (CAN-C)

−

2.0

−4.5 V

2

CAN-L voltage (CAN-C)

−

0.5

−3.0 V

200

Original VIN writing status

When writing status is normal

Comp/Unperformed 
or Comp and locked

When writing status is abnormal ECU internal Err