Mitsubishi L200. Manual — part 454

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-72

YES :

Replace the hydraulic unit assembly

(integrated with ASTC-ECU) (Refer to

P.35C-140

.). Then go to Step 6.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunctions .).

STEP 6. Check whether the diagnosis code is
reset.
Check again if the diagnosis code is set.
(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.C1291 set?

YES :

Go to Step 1.

NO :

The procedure is complete.

Code No.C1292: CAN communication error

CAUTION

• If there is any problem in the CAN bus lines,

an incorrect diagnosis code may be set. Diag-
nose the CAN bus lines before the diagnosis
codes (Refer to GROUP 54C

− CAN Bus Diag-

nostics Table ).

• Whenever the ECU is replaced, ensure that

the communication circuit is normal.

OPERATION
ASTC-ECU communicates with other systems and
sensor via CAN-bus, and shares the necessary infor-
mation for the system operation.

DIAGNOSIS CODE SET CONDITIONS
This code is set if there is a problem in the CAN-bus
line, or if a problem is found in any ECU or sensor,
which uses the CAN communication.

PROBABLE CAUSES
The most likely causes for this diagnosis code to set
is:

• Damaged CAN-bus line

• Damaged wiring harness or connector

• Malfunction of the Engine-ECU.

• Malfunction of the A/T-ECU.

• Malfunction of the steering wheel sensor.

• Malfunction of the G and yaw rate sensor.

• Malfunction of the hydraulic unit assembly (inte-

grated with ASTC-ECU)

DIAGNOSIS

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 lines (Refer to GROUP
54C

− CAN Bus Diagnostics Table ). Then

go to Step 4.

STEP 2. M.U.T.-III other diagnosis code
(1) Turn the ignition switch to the "ON" position.
(2) Check if the diagnosis code is set from all

system.

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

position.

Q: Is any diagnosis code set?

YES :

Diagnose the set diagnosis code, then go

the Step 4.

NO :

Go to Step 3.

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.C1292 set?

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-73

YES :

Check the engine-ECU, A/T-ECU, ETACS-

ECU, steering wheel sensor and G and yaw
rate sensor power voltage and earth circuit
connection. If there is no malfunction,
replace the hydraulic unit (integrated with
ASTC

−ECU) (Refer to

P.35C-140

). Then go

to Step 4.

NO :

It can be assumed that this malfunction is
intermittent. Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service
Points

− How to Cope with Intermittent

Malfunction .

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.C1292 set?

YES :

Go to Step 1.

NO :

The procedure is complete.

Code No.C1293: Abnormal rear differential lock detection circuit <Vehicle with rear differential lock
system>

REAR
DIFFERENTIAL
LOCK-ECU

REAR
DIFFERENTIAL
LOCK
DETECTION
SWITCH

ASTC-ECU

Rear differential lock Circuit

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

ACB00847

NOTE

LHD

NOTE

:

RHD

:

AC800980

AG

Connector: A-48

(B)

AC504324 AZ

Connectors: F-13, F-13-1

Harness connector
(harness side)

F-13 (GR)
F-13-1

2 1

AC600688

Connector: C-13, C-145 <LHD>

BX

C-13

C-13

C-145
Harness side

6

2

3

4

10 9 8 7

1
5

C-145

AC600687CV

Connectors: C-29, C-33 <LHD>

16

10

13

4

1112

1 2 3

15

14

5

20

18

17

19

7

6

8 9

C-29

C-33

C-33

C-29

AC509930CC

Connector: C-145 <RHD>

Harness side

6

2

3

4

10 9 8 7

1
5

AC600623DL

Connector: C-13 <RHD>

AC509930CB

Connectors: C-29, C-33 <RHD>

Harness side

C-29

C-33

C-33

C-29

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-74

CAUTION

• If there is any problem in the CAN bus lines,

an incorrect diagnosis code may be set. Diag-
nose the CAN bus lines before the diagnosis
codes (Refer to GROUP 54C

− CAN Bus Diag-

nostics Table .).

• Whenever the ECU is replaced, ensure that

the communication circuit is normal.

OPERATION
ASTC-ECU detects the rear differential lock opera-
tion status by the following information.

• Rear differential lock detection switch: "ON"

• Rear differential lock indicator lamp: illuminates

or flashes

If these signals become effective, it is judged that the
rear differential lock is activated and ABS (EBD)/
ASC/TCL control is prohibited. The ASC indicator
lamp, the ASC OFF indicator lamp, the ABS warning
lamp, and brake warning lamp illuminate at the same
time.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set in the following cases.

• Rear differential lock detection switch: "ON",

Rear differential lock indicator signal: When the
"OFF" signal is received for a certain period at the
same time

• Rear differential lock detection switch: "OFF",

Rear differential lock indicator signal: When the
"ON" signal is received for a certain period at the
same time

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-75

PROBABLE CAUSES

• Damaged wiring harness or connector

• Malfunction of rear differential lock detection

switch

• Malfunction of rear differential lock-ECU

• Malfunction of ASTC-ECU

DIAGNOSIS

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 3.

NO :

Repair the CAN bus line (Refer to GROUP
54C

− CAN Bus Diagnostics Table .). Then

go to Step 2.

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) Start the engine.
(6) Turn the rear differential lock switch to the "ON"

position.

(7) Drive the vehicle more than 10 seconds at the

speed exceeds 10 km/h.

(8) Check if the diagnosis code is set.

Q: Is code No.C1293 set?

YES :

Go to Step 3.

NO :

The procedure is complete.

STEP 3. Check the M.U.T.-III data list.
(1) Turn the ignition switch to the "ON" position.
(2) Operate the rear differential lock switch, and

check if the operation status matches the data list
output.

• Item No.63: Rear differential lock switch

OK:

(Rear differential lock switch: ON): ON
(Rear differential lock switch: OFF): OFF

Q: Is the check result normal?

YES :

Go to Step 13.

NO :

Go to Step 4.

STEP 4. Connector check: A-48 ASTC-ECU
connector, F-13-1 rear differential lock detection
switch connector, C-145 rear differential lock-
ECU connector, C-13 intermediate connector, C-
29 intermediate connector, C-33 intermediate
connector, F-13 intermediate connector.

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair or replace the damaged
component(s). Then go to Step 15.

STEP 5. Rear differential lock detection switch
check
Refer to GROUP 27

− On-vehicles service, Rear dif-

ferential Lock Detection Switch Check .

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Replace the Rear differential lock detection
switch (Refer to GROUP 27

− Rear

differential lock .). Then go to Step 15.

STEP 6. Resistance measurement at the C-145
rear differential lock-ECU connector
(1) Disconnect the C-145 rear differential lock-ECU

connector and measure the resistance at the
harness side.

(2) Disconnect the A-48 ASTC-ECU connector.
(3) Measure the resistance between the C-145 rear

differential lock-ECU connector terminal No.10
and body earth.

OK: No continuity

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the wiring harness. Then go to Step
15.

STEP 7. Voltage measurement at the C-145 rear
differential lock-ECU connector
(1) Disconnect the C-145 rear differential lock-ECU

connector and measure the voltage at the
harness side.

(2) Disconnect the A-48 ASTC-ECU connector.
(3) Measure the voltage between the C-145 rear

differential lock-ECU connector terminal No.10
and body earth.

OK: 1 V or less

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Repair the wiring harness. Then go to Step
15.