2004 MITSUBISHI ENDEAVOR sensor

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

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

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System Select."
5. Choose "ABS/ASC/ASTC" and "STEERING ANGLE SENSOR" from the
"CHASSIS" tab.
6. Select "MITSUBISHI."
7. Select "Diagnostic Trouble Code".
8. If a DTC is set, it is shown.
9. Choose "DTC erase" to erase the DTC.
HOW TO READ DATA LIST Required Special Tools:
MB991958: Scan Tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.) MB991827: MUT-III USB Cable MB991910: MUT-III Main Harness A
1. Connect scan tool MB991958 to the data link connec
tor.
CAUTION: To prevent damage to scan tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting scan tool
MB991958.

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

Fig. 38: Diagnostic Trouble Code Chart (3 Of 3)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
< STEERING WHEEL SENSOR DTC >
2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor

Fig. 39: Steering Wheel Sensor DTC Chart

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
DIAGNOSTIC TROUBLE CODE DEFINITIONS DIAGNOSTIC TROUBLE CODE DEFINITIONS DTC
Description
DTC C1200, DTC C1205, DTC C1210, DTC C1215
FR WHEEL SPD. SNSR.
MALFUNCTION, FL WHEEL SPD.
SNSR. MALFUNCTION, RR
WHEEL SPD. SNSR.
MALFUNCTION, RL WHEEL SPD.
SNSR. MALFUNCTION
DTC C1201, DTC C1206, DTC C1211, DTC C1216
FR WHEEL SPD. SNSR. INVALID
SIGNAL, FL WHEEL SPD. SNSR.
INVALID SIGNAL, RR WHEEL
SPD. SNSR. INVALID SIGNAL, RL
WHEEL SPD. SNSR. INVALID
SIGNAL
DTC C1223
SUSPENSION OF SNSR. ACTIVE
CHECK
DTC C1226, DTC C1231, DTC C1236, DTC C1241, DTC C1246, DTC C1251, DTC C1256, DTC
FR INLET VALVE, FR OUTLET
VALVE, FL INLET VALVE, FL
OUTLET VALVE, RR INLET

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

C1261, DTC C1300, DTC C1305, DTC C1310, DTC C1315
VALVE, RR OUTLET VALVE, RL
INLET VALVE, RL OUTLET
VALVE, FR CUT VALVE, FR
SUCTION VALVE, FL CUT VALVE,
FL SUCTION VALVE
DTC C1266, DTC C1273, DTC C1274
MOTOR STUCK, MOTOR DRIVE
CIRCUIT STUCK OFF, MOTOR
DRIVE CIRCUIT STUCK ON
DTC C1266
MOTOR SYSTEM (SEIZURE)
DTC C1273
MOTOR RELAY PROBLEM
(STUCK OFF)
DTC C1274
MOTOR RELAY PROBLEM
(STUCK ON)
DTC C1278, DTC C1279
VALVE POWER CIRCUIT STUCK
OFF, VALVE POWER CIRCUIT
STUCK ON
DTC C1290
REVERSE SIGNAL
DTC C1345
BRAKE FLUID LEVEL
INSUFFICIENT
DTC C1361, DTC C1362, DTC C1363,
M/C PRESSURE SNSR.
STUCK/LOW GAIN, M/C
PRESSURE SNSR. LOW VOLTAGE,
M/C PRESSURE SNSR. HIGH
VOLTAGE
DTC C1366, DTC C1371, DTC C1381, DTC C1385, DTC C1386, DTC C1387, C1388, DTC C1389, DTC C1390
LATERAL G SNSR. STUCK/LOW
GAIN, YAW RATE SNSR.
STUCK/LOW GAIN, STRAIGHT G
SNSR. STUCK/LOW GAIN, YAW
RATE SENSOR, STRAIGHT G
SENSOR/G PERFORMANCE,
LATERAL G SENSOR/G
PERFORMANCE (LATERAL G
SENSOR OR G PERFORMANCE),
DTC YAW RATE SENSOR ACTIVE

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

CHECK, STRAIGHT G SENSOR
ACTIVE CHECK, LATERAL G
SENSOR ACTIVE CHECK
DTC C1366
LATERAL G-SENSOR (SEIZURE
OR ABNORMAL OUTPUT SIGNAL)
DTC C1371
YAW RATE G-SENSOR (SEIZURE,
ABNORMAL OUTPUT SIGNAL OR
OSCILLATION)
DTC C1381
STRAIGHT G-SENSOR (SEIZURE
OR ABNORMAL OUTPUT SIGNAL)
DTC C1385
YAW RATE SENSOR (ABNORMAL
OUTPUT OR POOR
PERFORMANCE)
DTC C1386
STRAIGHT G-SENSOR
(LONGITUDINAL OR LATERAL
PERFORMANCE DETERIORATED)
DTC C1387
LATERAL G-SENSOR/G
PERFORMANCE (LATERAL G-
SENSOR OR G PERFORMANCE) <
LONGITUDINAL OR LATERAL
PERFORMANCE DETERIORATED
>
DTC C1388
YAW RATE SENSOR ACTIVE
CHECK (ACTIVE CHECK
FAILURE)
DTC C1389
STRAIGHT G-SENSOR ACTIVE
CHECK (ACTIVE CHECK
FAILURE)
DTC C1390
LATERAL G-SENSOR ACTIVE
CHECK (ACTIVE CHECK
FAILURE)
DTC C1393
INCONP. learn neutral (Lateral G)
DTC C1394
INCOMP. LEARN NEUTRAL (SAS)
DTC C1395
INCOMP. BRAKE FLUID FILLING

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