Mitsubishi Grandis. Manual — part 932

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-53

<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 "ON" signal when the brake pedal is pressed or
the "OFF" signal when the brake pedal is released is
input to the TCL/ASC-ECU (terminal 41).

DIAGNOSIS CODE SET CONDITIONS

Diagnosis code No.1340 is set in the following cases:

• Stop lamp switch is not operating properly and

remains ON state and vehicle speed exceeds
20km/h for more than 6 minutes.

• Stop lamp switch system harness is damaged

and no signal is input to TCL/ASC-ECU.

PROBABLE CAUSES

The most likely causes for this diagnosis code to set
are:

• Malfunction of the stop lamp switch

• Incorrect positioning of stop lamp switch

• Malfunction of bypass resistance integrated in

stop lamp switch

• Damaged wiring harness or connector

• Malfunction of the hydraulic unit (integrated with

TCL/ASC-ECU)

AC313601

26

FUSIBLE
LINK

RELAY
BOX

STOP LAMP
SWITCH

TCL/ASC-ECU

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

Stop Lamp Switch Circuit

AB

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-54

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. Check whether the diagnosis code is
reset.

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.C1340 set?

YES :

Go to Step 3.

NO :

The procedure is complete.

STEP 3. Check the stop lamp operation.

Q: Does the stop lamp come on and go out correctly?

YES :

Go to Step 6.

NO :

Go to Step 4.

STEP 4. Check the stop lamp switch installation
condition.

Q: Is the stop lamp switch installed properly?

YES :

Go to Step 5.

NO :

Repair it and then go to Step 11.

STEP 5. Check the stop lamp switch continuity.
(1) Remove the stop lamp switch (Refer to GROUP

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-55

35A, Brake Pedal

P.35A-12

).

(2) Connect an ohmmeter to stop lamp switch

terminals 1 and 2, and check whether there is
continuity when the plunger of the stop lamp
switch is pushed in and when it is released.

(3) The stop lamp switch is in good condition if there

is no continuity when the plunger is pushed in to
a depth of within 4 mm from the outer case edge
surface, and if there is continuity when it is
released.

Q: Is the check result normal?

YES :

Check the stop lamp circuit and repair and

then go to Step 6.

NO :

Replace the stop lamp switch and then go to
Step 11.

STEP 6. MUT-III data list

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) Select "Interactive Diagnosis" from the start-up

screen.

(3) Select "System Select."
(4) Choose "ABS/ASC/ASTC" from the "CHASSIS"

tab.

(5) Select "Data List."
(6) Choose an item 06 and select the "OK" button.

• Item 06: Stop lamp switch

OK:
Brake pedal stepped down: ON
Brake pedal released: OFF

Q: Is the check result normal?

YES :

This malfunction is intermittent. Refer to

GROUP 00, How to Use
Troubleshooting/Inspection Service Points

−

How to Cope With Intermittent Malfunction

P.00-5

.

NO :

Go to Step 7.

ACX00671AE

No continuity

Continuity

4 mm

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-56

STEP 7. Voltage measurement at TCL/ASC-ECU
connector A-04.
(1) Turn the ignition switch to the "ON" position.

(2) Disconnect TCL/ASC-ECU connector A-04 and

measure at the harness side.

(3) Measure the voltage between terminal 41 and

earth.

OK:
Stop lamp switch OFF: Less than 1V
Stop lamp switch ON (Depress the brake
pedal): System voltage

Q: Is the check result normal?

YES :

Erase the diagnosis code memory, and

recheck if any diagnosis code sets. If
diagnosis code No.C1340 set, replace the
hydraulic unit (integrated with
TCL/ASC-ECU). Then go to Step 11.

NO :

Go to Step 8.

AC312620AO

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)