Mitsubishi L200. Manual - part 445

 

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Mitsubishi L200. Manual - part 445

 

 

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-36

STEP 7. Check the front hub for looseness.
NOTE: 

.

•

If the wheel bearing or front hub or axle shaft 
bearing are loose, the gap between the wheel 
speed sensor and ABS rotor may become exces-
sive.

•

Check the front hub, which diagnosis code indi-
cates, for looseness. (Refer to GROUP 26, On-
vehicle service 

−

 Wheel bearing axial play check 

.).

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Replace the front hub assembly (Refer to 
GROUP 26, Front axle hub assembly .). 
Then go to Step 13.

STEP 8. Check the ABS rotor.
Check the ABS rotor (FR), which diagnosis code 
indicates, for foreign material or deformation.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

If the ABS rotor (FR) is contaminated with 
foreign material, clean it. If the front hub 
assembly is deformed, replace it (Refer to 
GROUP 26, Front axle hub assembly .). 
Then go to Step 13.

STEP 9. Connector check: A-48 ASTC-ECU 
connector, A-125 front wheel speed sensor (RH) 
connector.

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Repair the defective connector. Then go to 
Step 13.

STEP 10. Voltage measurement at the A-48 
ASTC-ECU connector
(1) Disconnect the A-48 ASTC-ECU connector, the 

A-125 front wheel speed sensor (RH) connector.

(2) Measure the voltage between the A-48 ASTC-

ECU connector terminal No.7 and body earth.

OK: 1V or less

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Repair the harness wire. Then go to Step 
13.

STEP 11. Resistance measurement at the A-48 
ASTC-ECU connector
(1) Disconnect the A-125 front wheel speed sensor 

(RH) connector, and measure the resistance at 
the harness connector side.

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

ECU connector terminal No.7 and body earth.

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Repair the harness wire. Then go to Step 13 
.

STEP 12. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 15 km/h or more.

NOTE: The ABS warning lamp does not turn OFF 
in some cases unless the vehicle runs at 15 km/h 
or higher.

Q: Is the diagnosis code No.C1201 set?

YES : 

Replace the hydraulic unit (integrated with 

ASTC-ECU) (Refer to 

P.35C-140

.). Then go 

to Step 13.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunctions .).

STEP 13. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 15 km/h or more.

NOTE: The ABS warning lamp does not turn OFF 
in some cases unless the vehicle runs at 15 km/h 
or higher.

Q: Is the diagnosis code No.C1201 set?

YES : 

Return to Step 1.

NO : 

This diagnosis is complete.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-37

Code No.C1206: Wheel speed sensor (FL) (signal short circuit)

ACB00772

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

Wheel Speed Sensor Circuit

ASTC-ECU

FRONT WHEEL 
SPEED SENSOR 
(LH)

FRONT WHEEL 
SPEED SENSOR 
(RH)

REAR WHEEL 
SPEED SENSOR
(LH)

REAR WHEEL 
SPEED SENSOR
(RH)

AC800980

AG

Connector: A-48

(B)

AC502545AS

Connector: A-119

A-119 (B)

A-119 Harness
connector
(harness side)

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-38

CAUTION

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

an incorrect diagnosis code may be set. Prior 
to this diagnosis, diagnose the CAN bus lines 
(Refer to GROUP 54C 

− CAN Bus Diagnostics 

Table .).

• Before replacing the ECU, ensure that the 

communication circuit is normal.

OPERATION

• A toothed ABS rotor generates a voltage pulse as 

it moves across the pickup field of each wheel 
speed sensor.

• The wheel speed sensor transmit the frequency 

of the pulses to the ASTC-ECU.

• The hydraulic unit assembly (integrated with 

ASTC-ECU) modulates the amount of braking 
force individually applied to each wheel cylinder.

DIAGNOSIS CODE SET CONDITION
Diagnosis code No.C1206 is set if any abnormal volt-
age from the wheel speed sensor is detected without 
the outputs of the codes No.C1205 or C1207.

PROBABLE CAUSES

Current trouble

• Damaged wiring harness and connectors

• Teeth lack or clogging of the ABS rotor

• Malfunction of the front hub assembly

• Noise interference

• Wheel speed sensor malfunction

• ASTC-ECU malfunction

Past trouble

• Carry out diagnosis with particular emphasis on 

wiring harness and connector failures between 
ASTC-ECU and the wheel speed sensor. For 
diagnosis procedures, refer to How to treat past 
trouble (GROUP 00 

− How to Cope with Intermit-

tent Malfunctions .).

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis
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 lines (Refer to GROUP 
54C 

− CAN Bus Diagnostics Table .). On 

completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting 
CAN bus lines
(1) Erase the diagnosis code.
(2) Drive the vehicle at 15 km/h or more.

NOTE: The ABS warning lamp does not turn OFF 
in some cases unless the vehicle runs at 15 km/h 
or higher.

Q: Is the diagnosis code No.C1206 set?

YES : 

Go to Step 3.

NO : 

This diagnosis is complete.

STEP 3. M.U.T.-III diagnosis code
Check that the diagnosis codes No.C1205 or C1207 
is also set.

Q: Are the diagnosis codes No.C1205 or C1207 also 

set?
YES : 

Perform the diagnosis for the diagnosis 

codes No.C1205 or C1207 (Refer to 

P.35C-

25

, 

P.35C-50

.).

NO : 

Go to Step 4.

STEP 4. M.U.T.-III data list
Check the following data list (Refer to 

P.35C-131

.).

• Item No.01: FL wheel speed sensor

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Go to Step 5.

STEP 5. Check for wheel speed sensor (FL) 
installation
Check how the wheel speed sensor (FL) is installed 
correctly (Disconnection of wheel speed sensor (FL), 
loose mounting bolt, etc.).

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Reinstall the wheel speed sensor (FL) 
correctly (Refer to 

P.35C-141

). Then go to 

Step 13.

STEP 6. Check for wheel speed sensor (FL) 
output current
Refer to 

P.35C-135

.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Replace the wheel speed sensor (FL) 
(Refer to 

P.35C-141

.). Then go to Step 13.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-39

STEP 7. Check the front hub for looseness.
NOTE: 

.

•

If the wheel bearing or front hub or axle shaft 
bearing are loose, the gap between the wheel 
speed sensor and ABS rotor may become exces-
sive.

•

Check the front hub, which diagnosis code indi-
cates, for looseness. (Refer to GROUP 26, On-
vehicle service 

−

 Wheel bearing axial play check 

.).

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Replace the front hub assembly (Refer to 
GROUP 26, Front axle hub assembly .). 
Then go to Step 13.

STEP 8. Check the ABS rotor.
Check the ABS rotor (FL), which diagnosis code indi-
cates, for foreign material or deformation.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

If the ABS rotor (FL) is contaminated with 
foreign material, clean it. If the front hub 
assembly is deformed, replace it (Refer to 
GROUP 26, Front axle hub assembly .). 
Then go to Step 13.

STEP 9. Connector check: A-48 ASTC-ECU 
connector, A-119 front wheel speed sensor (LH) 
connector.

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Repair the defective connector. Then go to 
Step 13.

STEP 10. Voltage measurement at the A-48 
ASTC-ECU connector
(1) Disconnect the A-48 ASTC-ECU connector, the 

A-119 front wheel speed sensor (LH) connector,.

(2) Measure the voltage between the A-48 ASTC-

ECU connector terminal No.19 and body earth.

OK: 1V or less

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Repair the harness wire. Then go to Step 
13.

STEP 11. Resistance measurement at the A-48 
ASTC-ECU connector
(1) Disconnect the A-119 front wheel speed sensor 

(LH) connector, and measure the resistance at 
the harness connector side.

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

ECU connector terminal No.19 and body earth.

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Repair the harness wire. Then go to Step 13 
.

STEP 12. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 15 km/h or more.

NOTE: The ABS warning lamp does not turn OFF 
in some cases unless the vehicle runs at 15 km/h 
or higher.

Q: Is the diagnosis code No.C1206 set?

YES : 

Replace the hydraulic unit (integrated with 

ASTC-ECU) (Refer to 

P.35C-140

.). Then go 

to Step 13.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunctions .).

STEP 13. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 15 km/h or more.

NOTE: The ABS warning lamp does not turn OFF 
in some cases unless the vehicle runs at 15 km/h 
or higher.

Q: Is the diagnosis code No.C1206 set?

YES : 

Return to Step 1.

NO : 

This diagnosis is complete.

 

 

 

 

 

 

 

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