Mitsubishi L200. Manual - part 784

ETACS

CHASSIS ELECTRICAL

54A-503

YES : 

Replace the ETACS-ECU and register the 

ID codes (Refer to 

P.54A-39

). Then, carry 

out the CAN bus diagnostics. Then go to 
Step 6  .

NO : 

A poor connection, open circuit or other 
intermittent malfunction is present in the 
CAN bus lines between the engine-ECU or 
the A/T-ECU <A/T> and the ETACS-ECU 
(Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

STEP 6. Check whether the diagnosis code is 
reset.
Recheck 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) On completion, check that the diagnosis code is 

reset.

Q: Is the diagnosis code set?

YES : 

Return to Step 1.

NO : 

The procedure is complete.

Code No.U1102: ABS-ECU or ASTC-ECU timeout

CAUTION

• If diagnosis code No.U1102 is set in the 

ETACS, diagnose the CAN main bus line.

• Whenever the ECU is replaced, ensure that 

the communication circuit is normal.

TROUBLE JUDGEMENT
The ETACS-ECU receives ABS or ASTC-related sig-
nals from the ABS-ECU or ASTC-ECU through the 
CAN bus lines. If the ECU cannot receive the ABS or 
ASTC-related signal at all, diagnosis code No.U1102 
will be set.

COMMENT ON TROUBLE SYMPTOM

The M.U.T.-III shows a diagnosis code status as 

active.

• Connector(s) or wiring harness in the CAN bus 

lines between the ETACS-ECU and the ABS-
ECU or ASTC-ECU, the power supply circuits to 
the ABS-ECU or ASTC-ECU itself may be defec-
tive.

The M.U.T.-III shows a diagnosis code status as 

stored.

• If diagnosis code No.U1102 is set as past trouble, 

carry out diagnosis with particular emphasis on 
wiring and connector(s) in the CAN bus lines 
between the ETACS-ECU and the ABS-ECU or 
ASTC-ECU, or power supply to the ABS-ECU or 
ASTC-ECU. For diagnosis procedures, refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points 

− How to Treat Past Trouble .

NOTE: For a past trouble, you cannot find it by the 

M.U.T.-III CAN bus diagnostics even if there is 
any failure in CAN bus lines. In this case, refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points 

−

 How to Cope with Intermit-

tent Malfunctions  and check the CAN bus lines. 
You can narrow down the probable cause of the 
trouble by referring to the diagnosis code, which 
is set regarding the CAN communication-linked 
ECUs (Refer to GROUP 54C 

−

 CAN Bus Line 

Diagnostic Flow ).

PROBABLE CAUSES

• Malfunction of the ABS-ECU or ASTC-ECU

• Malfunction of the CAN bus

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 6.

STEP 2. Check the diagnosis code of the ABS-
ECU or ASTC-ECU.
Check if the diagnosis code is set in either of the 
ABS-ECU or ASTC-ECU.

Q: Is the diagnosis code set?

YES : 

Diagnose the ABS-ECU or ASTC-ECU 

(Refer to GROUP 35B 

− Troubleshooting  

<ABS-ECU> or GROUP 35C 
Troubleshooting  <ASTC-ECU>). On 
completion, go to Step 6.

NO : 

Go to Step 3.

ETACS

CHASSIS ELECTRICAL

54A-504

STEP 3. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN 
communication-linked systems below, is set.

• Engine-ECU

U1102: ABS-ECU or ASTC-ECU Timeout

Q: Is the diagnosis code set?

YES : 

Go to Step 4.

NO : 

Go to Step 5.

STEP 4. 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) On completion, check that the diagnosis code is 

reset.

Q: Is the diagnosis code set?

YES : 

Replace the ABS-ECU or ASTC-ECU. 

Then, carry out the CAN bus 
diagnostics.Then go to Step 6.

NO : 

A poor connection, open circuit or other 
intermittent malfunction is present in the 
CAN bus lines between the ABS-ECU or 
ASTC-ECU and the ETACS-ECU (Refer to 
GROUP 00, How to Use Troubleshooting/
Inspection Service Points 

− How to Cope 

with Intermittent Malfunctions ).

STEP 5. 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) On completion, check that the diagnosis code is 

reset.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU and register the 

ID codes (Refer to 

P.54A-39

). Then, carry 

out the CAN bus diagnostics. Then go to 
Step 6   .

NO : 

A poor connection, open circuit or other 
intermittent malfunction is present in the 
CAN bus lines between the ABS-ECU or 
ASTC-ECU and the ETACS-ECU (Refer to 
GROUP 00, How to Use Troubleshooting/
Inspection Service Points 

− How to Cope 

with Intermittent Malfunctions ).

STEP 6. Check whether the diagnosis code is 
reset.
Recheck 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) On completion, check that the diagnosis code is 

reset.

Q: Is the diagnosis code set?

YES : 

Return to Step 1.

NO : 

The procedure is complete.

Code No.U1110: A/C-ECU timeout

CAUTION

• If diagnosis code No.U1110 is set in the 

ETACS-ECU, diagnose the CAN main bus line.

• Whenever the ECU is replaced, ensure that 

the input and output signal circuits are nor-
mal.

• For vehicles without automatic A/C, diagnosis 

code No. U1110 does not mean that there is a 
problem.

NOTE: When the diagnosis codes relating to the 
CAN communication error are set, make sure of the 
vehicle equipment. When the vehicle is not equipped 
with the system the ETACS-ECU communicates to, 

the diagnosis code is always output. This is not 
abnormal.
TROUBLE JUDGEMENT
The ETACS-ECU receives signal from the A/C-ECU. 
If A/C-related signal cannot be received at all, diag-
nosis code No.U1110 will be set.

ETACS

CHASSIS ELECTRICAL

54A-505

COMMENT ON TROUBLE SYMPTOM

The M.U.T.-III shows a diagnosis code status as 

active.

• Connector(s) or wiring harness in the CAN bus 

lines between the A/C-ECU and the ETACS-
ECU, the power supply system to the A/C-ECU, 
the A/C-ECU itself, or the ETACS-ECU may be 
defective.

The M.U.T.-III shows a diagnosis code status as 

stored.

• If diagnosis code No.U1110 is stored as a past 

trouble, carry out diagnosis with particular 
emphasis on wiring and connector(s) in the CAN 
bus line between the A/C-ECU and the ETACS-
ECU, and the power supply system to the A/C-
ECU. For diagnosis procedures, refer to GROUP 
00, How to Use Troubleshooting/Inspection Serv-
ice Points 

− How to Treat Past Trouble .

NOTE: For a past trouble, you cannot find it by the 

M.U.T.-III CAN bus diagnostics even if there is 
any failure in CAN bus lines. In this case, refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points 

−

 How to Cope with Intermit-

tent Malfunctions  and check the CAN bus lines. 
You can narrow down the probable cause of the 
trouble by referring to the diagnosis code, which 
is set regarding the CAN communication-linked 
ECUs (Refer to GROUP 54C 

−

 CAN Bus Line 

Diagnostic Flow ).

PROBABLE CAUSES

• Malfunction of the A/C-ECU

• Damaged harness wires and connectors

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 5.

STEP 2. Check the diagnosis code of the A/C.
Check that the A/C-ECU sets a diagnosis code.

Q: Is the diagnosis code set?

YES : 

Diagnose the A/C (Refer to ). On 

completion, go to Step 5.

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) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) On completion, check that the diagnosis code is 

reset.

Q: Is the diagnosis code set?

YES : 

Replace the A/C-ECU. After replacing the 

A/C-ECU, carry out the CAN bus 
diagnostics. Then go to Step 4.

NO : 

A poor connection, open circuit or other 
intermittent malfunction is present in the 
CAN bus lines between the A/C-ECU and 
the ETACS-ECU (Refer to GROUP 00, How 
to Use Troubleshooting/Inspection Service 
Points 

− How to Cope with Intermittent 

Malfunctions ).

STEP 4. 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) On completion, check that the diagnosis code is 

reset.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU and register the 

ID codes (Refer to 

P.54A-39

). After 

replacing the ECU, carry out the CAN bus 
diagnostics. Then go to Step 5.

NO : 

The procedure is complete.

STEP 5. Check whether the diagnosis code is 
reset.
Recheck 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) On completion, check that the diagnosis code is 

reset.

Q: Is the diagnosis code set?

YES : 

Return to Step 1.

NO : 

The procedure is complete.

ETACS

CHASSIS ELECTRICAL

54A-506

Code No.U1111: RV Meter time-out

CAUTION

• If diagnosis code No.U1111 is set in the 

ETACS-ECU, diagnose the CAN main bus line.

• Whenever the ECU is replaced, ensure that 

the input and output signal circuits are nor-
mal.

• For vehicles without RV meter, diagnosis 

code No. U1111 does not mean that there is a 
problem.

TROUBLE JUDGEMENT
The ETACS-ECU receives signal from the RV meter. 
If RV meter-related signal cannot be received at all, 
diagnosis code No.U1111 will be set.

COMMENT ON TROUBLE SYMPTOM

The M.U.T.-III shows a diagnosis code status as 

active.

• Connector(s) or wiring harness in the CAN bus 

lines between the RV meter and the ETACS-
ECU, the power supply system to the RV meter, 
the RV meter itself, or the ETACS-ECU may be 
defective.

The M.U.T.-III shows a diagnosis code status as 

stored.

• If diagnosis code No.U1111 is stored as a past 

trouble, carry out diagnosis with particular 
emphasis on wiring and connector(s) in the CAN 
bus line between the RV meter and the ETACS-
ECU, and the power supply system to the RV 
meter. For diagnosis procedures, refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points 

− How to Treat Past Trouble .

NOTE: For a past trouble, you cannot find it by the 

M.U.T.-III CAN bus diagnostics even if there is 
any failure in CAN bus lines. In this case, refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points 

−

 How to Cope with Intermit-

tent Malfunctions  and check the CAN bus lines. 
You can narrow down the probable cause of the 
trouble by referring to the diagnosis code, which 
is set regarding the CAN communication-linked 
ECUs (Refer to GROUP 54C 

−

 CAN Bus Line 

Diagnostic Flow ).

PROBABLE CAUSES

• Malfunction of the RV meter

• Damaged harness wires and connectors

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 5.

STEP 2. Check the diagnosis code of the RV 
meter
Check that the RV meter sets a diagnosis code.

Q: Is the diagnosis code set?

YES : 

Diagnose the RV meter (Refer to 

P.54A-

462

). On completion, go to Step 5.

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) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) On completion, check that the diagnosis code is 

reset.

Q: Is the diagnosis code set?

YES : 

Replace the RV meter. After replacing the 

RV meter, carry out the CAN bus 
diagnostics. Then go to Step 4.

NO : 

A poor connection, open circuit or other 
intermittent malfunction is present in the 
CAN bus lines between the RV meter and 
the ETACS-ECU (Refer to GROUP 00, How 
to Use Troubleshooting/Inspection Service 
Points 

− How to Cope with Intermittent 

Malfunctions ).

STEP 4. 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) On completion, check that the diagnosis code is 

reset.