Mitsubishi L200. Manual — part 462

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-104

STEP 2. M.U.T.-III other diagnosis code
Check whether the diagnosis code No. U1100 is set
by another ECU.

Q: Is the diagnosis code set?

YES :

Replace the Engine-ECU (Refer to GROUP

13A

− Engine-ECU ). Then go to Step 5.

NO :

Go to Step 3.

STEP 3. M.U.T.-III other diagnosis code
Check whether the diagnosis code is set by the
Engine-ECU.

Q: Is any diagnosis code set?

YES :

Perform troubleshooting for Engine-ECU

(Refer to GROUP 13A

− Troubleshooting ).

Then go to Step 5.

NO :

Go to Step 4.

STEP 4. M.U.T.-III diagnosis code
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.

(6) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is code No.U1100 set?

YES :

Replace the hydraulic unit (integrated with

ASTC-ECU) (Refer to

P.35C-140

). Then go

to Step 5.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunction ).

STEP 5. Check whether the diagnosis code is
reset.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is code No.U1100 set?

YES :

Go to Step 1.

NO :

The procedure is complete.

Code No.U1101: A/T-ECU timeout error

CAUTION

• If diagnosis code No.U1101 is set in the

ASTC-ECU, always diagnose the CAN main
bus line. If there is any fault in the CAN bus
lines, an incorrect diagnosis code may be set.

• Whenever the ECU is replaced, ensure that

the communication circuit is normal.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if ASTC-ECU cannot
receive the signal sent from the A/T-ECU for a cer-
tain period.

PROBABLE CAUSES

• Damaged harness or connector.

• Malfunction of the A/T-ECU.

• Malfunction of the ASTC-ECU.

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use 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

− CAN Bus Diagnostics Table ). Then

go to Step 5.

STEP 2. M.U.T.-III other diagnosis code
Check whether the diagnosis code No. U1101 is set
by another ECU.

Q: Is the diagnosis code set?

YES :

Replace the A/T-ECU (Refer to GROUP

23A

− A/T-ECU ) Then go to Step 5.

NO :

Go to Step 3.

STEP 3. M.U.T.-III other diagnosis code
Check whether the diagnosis code is set by A/T-
ECU.

Q: Is any diagnosis code set?

YES :

Perform troubleshooting for A/T-ECU (Refer

to GROUP 23A

− Troubleshooting ). Then

go to Step 5.

NO :

Go to Step 4.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-105

STEP 4. M.U.T.-III diagnosis code
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is code No.U1101 set?

YES :

Replace the hydraulic unit (integrated with

ASTC-ECU) (Refer to

P.35C-140

). Then go

to Step 5.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunction ).

STEP 5. Check whether the diagnosis code is
reset.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is code No.U1101 set?

YES :

Go to Step 1.

NO :

The procedure is complete.

Code No.U1104: Steering wheel sensor timeout error

CAUTION

• If diagnosis code No.U1104 is set in the

ASTC-ECU, always diagnose the CAN main
bus line. If there is any fault in the CAN bus
lines, an incorrect diagnosis code may be set.

• Whenever the ECU is replaced, ensure that

the communication circuit is normal.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if ASTC-ECU cannot
receive the signal sent from the steering wheel sen-
sor for a certain period.

PROBABLE CAUSES

• Damaged harness or connector.

• Malfunction of the steering wheel sensor.

• Malfunction of the ASTC-ECU.

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use 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

− CAN Bus Diagnostics Table ). Then

go to Step 4.

STEP 2. Check whether the diagnosis code is
reset.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.

(3) Turn the ignition switch to the "LOCK" (OFF)

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is code No.C1104 set?

YES :

Replace the steering wheel sensor (Refer to

P.35C-143

). Then go to Step 3.

NO :

The procedure is complete.

STEP 3. M.U.T.-III diagnosis code
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is code No.U1104 set?

YES :

Replace the hydraulic unit (integrated with

ASTC-ECU) (Refer to

P.35C-140

). Then go

to Step 4.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunctions ).

STEP 4. Check whether the diagnosis code is
reset.
(1) Turn the ignition switch to the "ON" position.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-106

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

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is code No.U1104 set?

YES :

Go to Step 1.

NO :

The procedure is complete.

Code No.U1105: G and yaw rate sensor timeout error

CAUTION

• If diagnosis code No.U1105 is set in the

ASTC-ECU, always diagnose the CAN main
bus line. If there is any fault in the CAN bus
lines, an incorrect diagnosis code may be set.

• Whenever the ECU is replaced, ensure that

the communication circuit is normal.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if ASTC-ECU cannot
receive the signal sent from the G and yaw rate sen-
sor for a certain period.

PROBABLE CAUSES

• Damaged harness or connector.

• Malfunction of the G and yaw rate sensor.

• Malfunction of the ASTC-ECU.

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use 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

− CAN Bus Diagnostics Table ). Then

go to Step 4.

STEP 2. Check whether the diagnosis code is
reset.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is code No.C1105 set?

YES :

Replace the G and yaw rate sensor (Refer

to

P.35C-142

). Then go to Step 3.

NO :

The procedure is complete.

STEP 3. M.U.T.-III diagnosis code
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is code No.U1105 set?

YES :

Replace the hydraulic unit (integrated with

ASTC-ECU) (Refer to

P.35C-140

). Then go

to Step 4.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunctions ).

STEP 4. Check whether the diagnosis code is
reset.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is code No.U1105 set?

YES :

Go to Step 1.

NO :

The procedure is complete.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-107

Code No.U1109: ETACS-ECU timeout error

CAUTION

• If diagnosis code No.U1109 is set in the

ASTC-ECU, always diagnose the CAN main
bus line. If there is any fault in the CAN bus
lines, an incorrect diagnosis code may be set.

• Whenever the ECU is replaced, ensure that

the communication circuit is normal.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if ASTC-ECU cannot
receive the signal sent from the ETACS-ECU for a
certain period.

PROBABLE CAUSES

• Damaged harness or connector.

• Malfunction of the ETACS-ECU.

• Malfunction of the ASTC-ECU.

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use 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, CAN bus line Diagnostic flow ). Then
go to Step 5.

STEP 2. M.U.T.-III other diagnosis code
Check whether the diagnosis code No. U1109 is set
by another ECU.

Q: Is the diagnosis code set?

YES :

Replace the ETACS-ECU. Then go to Step

5.

NO :

Go to Step 3.

STEP 3. M.U.T.-III other diagnosis code
Check whether the diagnosis code is set by the
ETACS-ECU.

Q: Is any diagnosis code set?

YES :

Perform troubleshooting for ETACS-ECU

(Refer to GROUP 54A

− Troubleshooting ).

Then go to Step 5.

NO :

Go to Step 4.

STEP 4. M.U.T.-III diagnosis code
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is code No.U1109 set?

YES :

Replace the hydraulic unit (integrated with

ASTC-ECU) (Refer to

P.35C-140

). Then go

to Step 5.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunction ).

STEP 5. Check whether the diagnosis code is
reset.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is code No.U1109 set?

YES :

Go to Step 1.

NO :

The procedure is complete.