Mitsubishi Grandis. Manual - part 941

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-89

Code No.C1860: Power supply high voltage
Code No.C1861: Power supply low voltage

<LH drive vehicles>

IGNITION
SWITCH (IG1)

TCL/ASC-ECU

POWER
SOURCE

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

TCL/ASC-ECU Power Supply and Ground Circuit

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-90

<RH drive vehicles>

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.

OPERATION

The TCL/ASC-ECU is energized by the ignition 
switch (IG1) through multi-purpose fuse 2 and the 
TCL/ASC-ECU terminal 4.

DIAGNOSIS CODE SET CONDITIONS

C1860 will be set when the power supply voltage to 
the TCL/ASC-ECU has decreased to a 
predetermined value or lower. C1861 will be set 
when the power supply voltage to the TCL/ASC-ECU 
has increased to a predetermined value or higher.

PROBABLE CAUSES

• Excessive electrical load

• Defective battery

• Damaged wiring harness or connector

• Malfunction of the hydraulic unit (integrated with 

TCL/ASC-ECU)

• Charging system failed

IGNITION
SWITCH (IG1)

TCL/ASC-ECU

POWER
SOURCE

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

TCL/ASC-ECU Power Supply and Ground Circuit

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-91

DIAGNOSIS

STEP 1. MUT-III CAN bus diagnostics

CAUTION

Before connecting or disconnecting the MUT-III, 
turn the ignition switch to the "LOCK" (OFF) 
position.
(1) Connect MUT-III to the 16-pin diagnosis 

connector.

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the CAN bus line (Refer to GROUP 
54D, CAN bus line Diagnostic flow 

P.54D-9

). Then go to Step 2.

STEP 2. MUT-III diagnosis code

CAUTION

Before connecting or disconnecting the MUT-III, 
turn the ignition switch to the "LOCK" (OFF) 
position.
(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.C1860 or C1861 set?

YES : 

Go to Step 3.

NO : 

The procedure is complete.

STEP 3. Check the battery.

Check the battery (Refer to GROUP 54A, Battery 
test 

P.54A-6

).

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Charge or replace the battery.

STEP 4. Check the charging system.

Check the charging system (Refer to GROUP 16, 
Charging system diagnosis 

P.16-5

).

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair or replace the charging system 
component(s).

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-92

STEP 5. Voltage measurement at TCL/ASC-ECU 
connector A-04.

(1) Disconnect the connector A-04, and connect 

special tool ABS Check Harness (MB991997) to 
the wiring harness-side connector.
NOTE: Do not connect special tool ABS Check 
Harness (MB991997) to the TCL/ASC-ECU.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 4 and 

earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 6.

AC312620AP

Oil reservoir

Connector: A-04

TCL/ASC-ECU

MB991997

Check connector

A-04 Harness connector

A-04

Hydraulic unit
(with built-in TCL/ASC-ECU)