engine MITSUBISHI ENDEAVOR 2004 Service Repair Manual

2004 BRAKES
Traction Control, Active Skid Control System - Endeavor
GENERAL INFORMATION Traction Control/Active Skid Control System (TCL/ASC) is available for AWD
models as optional equipment.
The Traction Control/Active Skid Control System is a combination system of
active skid control system and traction control system. The active skid control
system avoids a dangerous vehicle attitude by limiting the engine output and
braking a set of wheels (front left and right rear, or right front and left rear)
according to driving conditions. The traction control system prevents wheel
spinning at vehicle start. Fail-safe function ensures safety is maintained Diagnostic function provides improved serviceability To shorten the lines and enhance data transmission reliability, communication
with other ECU is
performed over a CAN
(Controller Area Network
).

2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor


2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor

Fig. 2: Traction Control, Active Skid Control Function Outline

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
SYSTEM CHECK SOUND When starting the engine, a thudding sound can sometimes be heard coming from
the engine compartment. This is a normal sound during the TCL/ASC self-check. TCL/ASC OPERATION SOUNDS AND SENSATIONS During normal operation, the TCL/ASC makes several sounds that may seem
unusual at first:
2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor

ACTUATOR HYDRAULIC UNIT The hydraulic unit includes a cut valve, suction valve and pressure switch for the
active skid control additionally, compared with the conventional hydraulic unit for
the ABS control. TRACTION CONTROL/ACTIVE SKID CONTROL SYSTEM OPERATION INDICATOR LIGHT AND TRACTION
CONTROL SYSTEM OFF INDICATOR LIGHT The Traction control/Active skid control system operation indicator light and
Traction control system OFF indicator light illuminate or flash under the conditions
below to inform the driver. TRACTION CONTROL/ACTIVE SKID CONTROL SYSTEM INDICATOR LIGHT
When the active skid control is active, the light flashes. When the traction control is active, the light flashes. When sensors related to traction control and active skid control are not
initialized, the li
ght flashes at a fre
quenc
y of once
per second.
NOTE:
The Traction control will activate when the system has
not been disabled by the traction control OFF switch,
and the vehicle speed has reached 4 - 9 mph (6 - 14
km/h). The traction control will deactivate when the front wheel
speed (both wheels) have decreased to 1 - 4 mph (2 - 6
km/h) for one second or more (four seconds or more if
the system is controlling the engine output). The Active skid control will be activated when the
vehicle speed exceeds 12 mph (20 km/h). The Active skid control will deactivate when the vehicle
speed has decreased to 9 mph (15 km/h) or lower.
NOTE: For the internal hydraulic circuit of the hydraulic unit, refer
to ACTIVE SKID CONTROL SYSTEM OPERATION
.

2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor

The ECU incorporates the ABS-ECU, active skid control-ECU, and traction
control-ECU. The integral design allows joint operation of the TCL/ASC-ECU with
the ABS and coordinated control of the driving force and braking force. SYSTEM CONFIGURATION The Traction Control and Active Skid Control (TCL/ASC) System is a system that
adds a yaw rate sensor, a steering wheel sensor and master cylinder pressure sensor
(incorporated in hydraulic unit) to the ABS system. OVERVIEW OF CONTROL The TCL/ASC-ECU detects vehicle movement based on information from various
sensors and calculates a model of ideal vehicle movement. After comparing actual
and ideal movements, it acts to bring the actual vehicle movement closer to the
ideal model by controlling specific wheel brake force and governing engine output.
It restrains under-steering and over-steering through a corrective yaw moment, as
explained on the following pages. EXAMPLE OF ACTIVE SKID CONTROL OPERATION The Active Skid Control manages the vehicle attitude by creating a yaw moment
from altering the balance between the cornering force and each wheel's braking
mechanism.
For example, on a slippery surface, if the vehicle tends to be under-steered contrary
to the driver's intention, a yaw moment (a rotational moment) is created to restrain
the under-steering by increasing the rear-inside braking force. On the other hand,
when the vehicle tends to be over-steered, a yaw moment (a restorative moment) is
created to restrain the over-steering by increasing the front-outside braking force.
Furthermore, when it is determined that the vehicle is over-speeding, safe and stable
cornerin
g is enabled b
y deceleration from restrictin
g en
gine out
put.

2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor

Fig. 10: Identifying Joint Control Specification
s
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
EXAMPLE OF OPERATION OF TRACTION CONTROL The Traction Control prevents drive force loss during slipping of the drive wheels
by automatically applying the brakes and sending engine torque reduction signal to
the PCM when the drive wheels slip or when driving on partly low-friction
surfaces. FAIL-SAFE AND DIAGNOSTIC FUNCTIONS The TCL/ASC-ECU regularly monitors input and out put signals. If an error is
detected in the system, the ECU sends a fail signal and the TCL/ASC indicator light
is illuminated or blinks. Various controls are processed depending on the cause of
malfunction as shown below. When the ABS system fails, the TCL/ASC system is
also suspended. However, when the TCL/ASC system fails, no other systems are
suspended. The appropriate indicator lights are illuminated/flashed.
The TCL/ASC-ECU includes the following functions to make system inspection
easier.
Diagnostic trouble code Display Data list Actuator test
All of the above operations can be carried out using scan tool MB991958.
ACTIVE SKID CONTROL SYSTEM OPERATION The TCL/ASC-ECU receives information from the PCM, the steering sensor, the G
and yaw-rate sensor and the wheel speed sensor. If the ECU determines that the
vehicle is tending to oversteer or understeer, it sends signals to the active skid
control system valves and the ABS solenoid valves to increase the fluid pressure to
the wheels.
The system closes the cut valve to shut the fluid channel to the suction valve, and
activates the
pum
p motor. The brake fluid, which is
pum
ped throu
gh the h
ydraulic

2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor

unit reservoir, will be supplied to the front left wheel during oversteering or the rear
right wheel during understeering when the vehicle is at right turn. Furthermore, the
system also controls the engine if the accelerator pedal is depressed excessively. DURING NORMAL BRAKING Fig. 11: During Normal Braking Diagram

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
The brake fluid flows from the master cylinder to the cut valve and the inlet valve
to supply fluid pressure to the relevant wheels.

2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor

Fig. 30: Status Of Operation Valve Specificatio
n
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
TRACTION CONTROL SYSTEM OPERATION The TCL/ASC-ECU receives information from the PCM, the G and yaw-rate
sensor, and the wheel speed sensor. If the ECU determines that a road wheel is
spinning, it will control the fluid pressure to the spinning wheel to apply torque to
the other road wheels. The operations of the ABS solenoid valves and the active
skid control system valves are the same as for the active skid control system.
Furthermore, the system also controls the engine if the accelerator pedal is
depressed excessively. TCL/ASC DIAGNOSIS INTRODUCTION TO TRACTION CONTROL/ACTIVE SKID CONTROL SYSTEM DIAGNOSIS The traction control/active skid control system (TCL/ASC) is a system that has
added the cut valve and suction valve to the conventional ABS system. These
valves are used to control each of the road wheels independently. These differences
include sounds, sensations, and vehicle performance that owners and service
technicians who are not familiar with TCL/ASC may not be used to.
Some operational characteristics may seem to be malfunctions, but they are simply
signs of normal TCL/ASC operation. When diagnosing the TCL/ASC system, keep
these operational characteristics in mind. Inform the owner of the kind of
performance characteristics to expect from an TCL/ASC-equipped vehicle. TCL/ASC Diagnostic Trouble Code Detection Conditions TCL/ASC diagnostic trouble codes (TCL/ASC DTCs) are set under different
conditions, depending on the malfunction detected. Most TCL/ASC DTCs will only
be set during vehicle operation. Some TCL/ASC DTCs will also be set during the
TCL/ASC self-check immediatel
y after the en
gine is started.
NOTE: *: When the ASC is operating while the brake pedal is
depressed, the suction valve turns on and off according to
the brake fluid amount supplied to the buffer chamber.
2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor

When you check if an TCL/ASC DTC will be displayed again after the DTC has
been erased, you should duplicate the TCL/ASC DTC set conditions. Depending on
the detection timing and set conditions for the specific TCL/ASC DTC, you must
either drive the vehicle or turn the engine off and restart it. To set the proper
conditions for that DTC again, refer to "TCL/ASC DTC SET CONDITIONS
" for
each TCL/ASC DTC that you are trying to reset.
TCL/ASC DIAGNOSTIC TROUBLESHOOTING STRATEGY Use these steps to plan your diagnostic strategy. If you follow them carefully, you
will be sure that you have exhausted most of the possible ways to find an TCL/ASC
fault.
1. Gather information about the problem from the customer.
2. Verify that the condition described by the customer exists.
3. Check the vehicle for any TCL/ASC DTC.
4. If you cannot verify the condition and there are no TCL/ASC DTCs, the
malfunction is intermittent. Refer to HOW TO COPE WITH
INTERMITTENT MALFUNCTIONS
.
5. If you can verify the condition but there are no TCL/ASC DTCs, or the system
cannot communicate with the scan tool, check that the basic brake system is
operating properly.
If the basic brake system is not operating properly, refer to the BASIC BRAKE SYSTEM DIAGNOSIS
, .
If the basic brake system is operating properly, refer to SYMPTOM CHART
.
6. If there is an TCL/ASC DTC, record the number of the DTC, then erase the
DTC from the memory using the scan tool.
7. Duplicate the TCL/ASC DTC set conditions to see if the same TCL/ASC DTC
will set again.
If the same TCL/ASC DTC sets again or the TCL/ASC DTC cannot be
erased, perform the diagnostic procedures for the DTC. Refer to
DIAGNOSTIC TROUBLE CODE CHART
.
If you cannot
get the same TCL/ASC DTC to set a
gain, the malfunction is

2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
.
2. Start the engine.
3. Set scan tool MB991958 to the data reading mode, and check the data list
items by driving the vehicle.
Item 01 (DTC C1200 is set): Front right ABS sensor Item 02 (DTC C1205 is set): Front left ABS sensor Item 03 (DTC C1210 is set): Rear right ABS sensor Item 04 (DTC C1215 is set): Rear left ABS sensor
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the speedometer indication match the scan tool indication?
YES: It can be assumed that this malfunction is intermittent.
Refer to HOW TO COPE WITH INTERMITTENT
MALFUNCTIONS
.
NO: Go to Step 4.
STEP 4. Measure the voltage at TCL/ASC-ECU connector A-32.
1. Disconnect the connector A-32, and connect special tool ABS Check
Harness (MB991952) to the wiring harness-side connector.
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage between the relevant signal and ground terminals in
the ABS sensor circuit and body ground. It should be less than 1V.
DTC C1200 is set: Between signal terminal 30 and body ground, and
between ground terminal 21 and body ground DTC C1205 is set: Between signal terminal 22 and body ground, and
between ground terminal 31 and body ground DTC C1210 is set: Between si
gnal terminal 8 and bo
dy ground, and
NOTE: Do not connect special tool ABS Check Harness
(MB991952) to the TCL/ASC-ECU.

2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor

6. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC C1278 or C1279 set?
YES: Go to Step 1.
NO: The procedure is complete.
DTC C1290: REVERSE SIGNAL CIRCUIT OPERATION The TCL/ASC-ECU and the PCM are connected via a CAN bus line each other.
The TCL/ASC-ECU receives reversing signal from the PCM. TCL/ASC DTC SET CONDITIONS This code is set under either of the following cases.
Estimated vehicle speed is 65 km/h or more and reversing signal has been
detected for ten seconds. The system determines that the vehicle can be driven forward according to gear
ratio estimated by the engine speed and the wheel speed, and that condition has
been kept for ten seconds. In addition to this, the system has detected the
reversing signal for ten seconds when the estimated vehicle speed is 30 km/h or
more.
TROUBLESHOOTING HINTS (The most likely causes for these DTCs are to set are:)
The CAN bus line is defective. Malfunction of the hydraulic unit (integrated with TCL/ASC-ECU)
DIAGNOSIS
CAUTION: If there is any problem in the CAN bus lines, an
incorrect diagnostic trouble code may be set. Prior to
this diagnosis, diagnose the CAN bus lines.
CAUTION: Whenever the ECU is replaced, ensure that the CAN
bus lines are normal.

2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor