Mitsubishi Galant 9G. Manual — part 441
TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS
TSB Revision
TRACTION CONTROL SYSTEM (TCL)
13D-32
.
CIRCUIT OPERATION
ABS/TCL-ECU terminal 6 is grounded every time the
TCL switch is pressed. ABS/TCL-ECU monitors this
operation state and turns the TCL ON or OFF.
.
COMMENT
The cause is probably an open-circuit in the TCL
switch circuit.
.
TROUBLESHOOTING HINTS
• Malfunction of the TCL switch.
• Damaged harness or connector.
• Malfunction of the ABS/TCL-ECU.
AC305209AB
A-02 (GR)
CONNECTOR: A-02
A-02 HARNESS CONNECTOR:
COMPONENT SIDE
AC305232AU
CONNECTORS: C-29, C-131
C-29
C-131(GR)
C-29 MALE SIDE
CONNECTOR
C-131 HARNESS
CONNECTOR:
COMPONENT SIDE
TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS
TSB Revision
TRACTION CONTROL SYSTEM (TCL)
13D-33
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991970: ABS Check Harness
STEP 1. Measure the terminal voltage at ABS/TCL-ECU
connector A-02.
(1) Disconnect the ABS/TCL-ECU connector A-02.
(2) Connect special tool MB991970 between the
ABS/TCL-EUC and the body-side harness connector.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the terminal voltage between special tool
MB991970 connector terminal 6 (ABS/TCL-ECU connector
A-02 terminal 6) and ground.
• When the TCL switch is not pressed, the voltage should
measure battery positive voltage (approximately 12
volts).
• When the TCL switch is pressed, the voltage should
measure 1 volt or less.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
(6) Disconnect special tool MB991970 between the
ABS/TCL-ECU and the body-side harness connector.
(7) Connect the ABS/TCL-ECU connector A-02.
Q: Is the terminal voltage battery terminal voltage when the
TCL switch is not pressed, and is the terminal voltage 1
volt or less when the TCL switch is pressed?
YES : Go to Step 6.
NO : Go to Step 2.
AC305209AB
A-02 (GR)
CONNECTOR: A-02
A-02 HARNESS CONNECTOR:
COMPONENT SIDE
AC307168
19
2
18
1
8
9
7
6
5
4
3
10
11
25
15
16
17
27
28
26
12
13
14
23
24
22 21 20
AB
ABS/TCL-ECU
MB991970
BODY SIDE
HARNESS
SPECIAL TOOL
28-PIN CONNECTOR
(ABS/TCL-ECU CONNECTOR A-02)
TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS
TSB Revision
TRACTION CONTROL SYSTEM (TCL)
13D-34
STEP 2. Check the TCL switch.
(1) Remove the TCL switch. (Refer to
(2) Connect an ohmmeter to the TCL switch between terminals
1 and 2.
(3) Check for continuity between terminals 1 and 2 when the
TCL switch is operated.
• There is no continuity between terminals 1 and 2 when
the TCL switch is not pressed.
• There is continuity between terminals 1 and 2 when the
TCL switch is pressed.
Q: Is there no continuity between terminals 1 and 2 when
the TCL switch is not pressed, and is there continuity
when the TCL switch is pressed?
YES : Install the TCL switch. (Refer to
). Then go
to Step 6.
NO : Replace the TCL switch. (Refer to
). Then
go to Step 7.
AC307176AB
C-131 TCL SWITCH
CONNECTOR
TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS
TSB Revision
TRACTION CONTROL SYSTEM (TCL)
13D-35
STEP 3. Check ABS/TCL-ECU connector A-02,
intermediate connector C-29 and TCL switch connectors
C-131 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Are there connectors and terminals in good condition?
YES : Go to Step 4.
NO : Repair or replace the faulty connector. (Refer to
GROUP 00E, Harness Connector Inspection
AC305209AB
A-02 (GR)
CONNECTOR: A-02
A-02 HARNESS CONNECTOR:
COMPONENT SIDE
AC305232AU
CONNECTORS: C-29, C-131
C-29
C-131(GR)
C-29 MALE SIDE
CONNECTOR
C-131 HARNESS
CONNECTOR:
COMPONENT SIDE
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