Mitsubishi Galant. Manual — part 535

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TSB Revision

TRACTION CONTROL SYSTEM (TCL)

35C-21

INSPECTION PROCEDURE 3: When the ignition switch is turned "ON" (engine stopped or after
startup), the TCL warning light does not illuminate.

AC003726

TCL Werning Light Circuit

AB

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

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TRACTION CONTROL SYSTEM (TCL)

35C-22

CIRCUIT OPERATION

•

Power to the TCL warning light is supplied from
the ignition switch. The ABS-ECU grounds the
circuit to illuminate the light.

•

The ABS-ECU illuminates the TCL warning light
for 3 seconds while running self-check. This light
can be illuminated for 3 seconds upon startup or
ignition switch ON, engine stopped.

TECHNICAL DESCRIPTION (COMMENT)
The cause may be: an open circuit in the TCL
warning light power supply circuit, a blown TCL
warning light bulb or ABS-ECU.

TROUBLESHOOTING HINTS

•

Blown fuse

•

Damaged wiring harness or connector

•

Burnt out TCL warning light bulb

•

Malfunction of the ABS-ECU

DIAGNOSIS

Required Special Tool:

•

MB991223: Harness Set

STEP 1. Check the power supply circuit at ABS-ECU
connector A-03.
(1) Disconnect connector A-03 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) The TCL warning light should illuminate when terminal 15 is

grounded.

Q: Does the TCL warning light illuminate?

YES : Replace the hydraulic unit (integrated with ABS-ECU)

and then go to Step 9.

NO : Go to Step 2.

AC003695 AB

CONNECTOR: A-03

AC003082 AM

CONNECTORS: C-73, C-78

C-73

C-78

JUNCTION BLOCK
(FRONT VIEW)

AC005077AB

CONNECTOR: C-12

AC005076AB

CONNECTOR: C-29

AC003702AB

A-03 (HARNESS SIDE)

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

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TRACTION CONTROL SYSTEM (TCL)

35C-23

STEP 2. Check the TCL indicator light bulb.
(1) Remove the combination meter (Refer to GROUP 54A,

Combination Meter

P.54A-65

.).

(2) Check the TCL indicator light bulb.

Q: Is the TCL indicator light bulb burned out?

YES : Replace the bulb and then go to Step 9.
NO : Go to Step 3.

STEP 3. Check the combination meter for the continuity.
(1) Remove the combination meter.
(2) Remove the TCL indicator light bulb. Then measure the

resistance between the bulb terminals.

(3) Install the TCL indicator light bulb to the combination meter,

and then measure the resistance between connector C-29
terminals 29 and 32. The resistance reading at this time
should be much the same as the resistance measured at
step (2).

Q: Are the two resistance values extremely different each

other?
YES : Replace the combination meter (printed circuit board).
NO (much the same) : Go to Step 4.

STEP 4. Check the power supply circuit at the combination
meter.
(1) Disconnect connector C-29, and check at the harness side.
(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 29 and ground. It

should be approximately 12 volts (battery positive voltage.).

Q: Is the voltage approximately 12 volts?

YES : Go to Step 5.
NO : Go to Step 7.

AC003699AB

CONNECTOR: C-29

AC005076AB

CONNECTOR: C-29

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

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TRACTION CONTROL SYSTEM (TCL)

35C-24

STEP 5. Check connectors C-12, C-29, and A-03.
Check connectors C-12, C-29, and A-03 (Refer to GROUP
00E, Harness Connector Inspection

P.00E-2

.).

Q: Is any of connectors damaged?

YES : Repair it and then go to Step 9.
NO : Go to Step 6.

AC003695 AB

CONNECTOR: A-03

AC005077AB

CONNECTOR: C-12

AC005076AB

CONNECTOR: C-29