Mitsubishi Grandis. Manual — part 921

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-9

DIAGNOSTIC TROUBLE CODE
PROCEDURES <TCL/ASC-ECU>

Code No.C1200: Front Right Wheel Speed Sensor (Open Circuit or Short Circuit)
Code No.C1205: Front Left wheel Speed Sensor (Open Circuit or Short Circuit)
Code No.C1210: Rear Right wheel Speed Sensor (Open Circuit or Short Circuit)
Code No.C1215: Rear Left wheel Speed Sensor (Open Circuit or Short Circuit)

CAUTION

If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Diagnose
the CAN bus lines before the diagnosis codes
(Refer to GROUP 54D, CAN bus-line diagnostic
flow

P.54D-9

).

OPERATION

• Wheel speed sensor is a kind of a pulse

alternator. It consists of encoders (a plate on
which north and south pole sides of the magnets
are arranged alternately) for detecting wheel
speed which rotates at the same speed of the
wheels and speed sensors. This sensor outputs
frequency pulse signals in proportion to wheel
speed.

(FRONT: LH)

(FRONT: RH)

(REAR: LH)

(REAR: RH)

WHEEL SPEED SENSOR

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

Wheel Speed Sensor Circuit

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-10

• The wheel speed sensors transmit the frequency

of the current pulses and the amount of voltage
generated by each pulse to the TCL/ASC-ECU.

DIAGNOSIS CODE SET CONDITIONS

Diagnosis codes No.C1200, C1205, 1210 and 1215
are set when breakage of the wires of the four wheel
speed sensors occur.

PROBABLE CAUSES

The most likely causes for these diagnosis codes to
set are:

• Malfunction of the wheel speed sensor

• Damaged wiring harness or connector

• Malfunction of the hydraulic unit (integrated with

TCL/ASC-ECU)

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.C1200, C1205, C1210 or C1215 set?

YES :

Go to Step 3

NO :

The procedure is complete.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-11

STEP 3. MUT-III data list

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) Start the engine.
(3) Set MUT-III to the data reading mode, and check

the data list items by driving the vehicle.

• Item 01 (Code No.C1200 is set): Front right

wheel speed sensor

• Item 02 (Code No.C1205 is set): Front left

wheel speed sensor

• Item 03 (Code No.C1210 is set): Rear right

wheel speed sensor

• Item 04 (Code No.C1215 is set): Rear left

wheel speed sensor

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

position.

Q: Does the speedometer indication match the MUT-III

indication?

YES :

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

P.00-5

.

NO :

Go to Step 4.

STEP 4. 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 the relevant signal

and earth terminals in the wheel speed sensor

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC312620AB

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)

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-12

circuit and body earth.

OK: less than 1V or less

• Code No.C1200 is set: Between signal

terminal 33 and body earth, and between
earth terminal 34 and body earth

• Code No.C1205 is set: Between signal

terminal 45 and body earth, and between
earth terminal 46 and body earth

• Code No.C1210 is set: Between signal

terminal 42 and body earth, and between
earth terminal 43 and body earth

• Code No.C1215 is set: Between signal

terminal 36 and body earth, and between
earth terminal 37 and body earth

Q: Is the check result normal?

YES :

Go to Step 5.

NO (When the voltage between terminal 33 or 34

−

and body earth measures more than 1 V) :

Go to

Step 6.

NO (When the voltage between terminal 45 or 46

−

and body earth measures more than 1 V) :

Go to

Step 8.

NO (When the voltage between terminal 42 or 43

−

and body earth measures more than 1 V) :

Go to

Step 10.

NO (When the voltage between terminal 36 or 37

−

and body earth measures more than 1 V) :

Go to

Step 12.

STEP 5. Resistance 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) Measure the resistance between the relevant

signal and earth terminals in the wheel speed

AC312620AC

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)