Page 2857 of 3870
10. If the change of the fluid level is 5 mm (0.2 inch) or more, the air has not been
completely bled from the system. The air bleeding procedure must be repeated.
Fig. 24: Identifying Fluid Level
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
OIL PUMP PRESSURE TEST Required Special Tools:
MB990662: Power Steering Oil Pressure Gauge MB991548: Power Steering Oil Pressure Gauge Adapter (Pump Side) MB991549: Power Steering Oil Pressure Gauge Adapter (Hose Side)
1. Disconnect the pressure hose from the oil pump, and then connect special tools
MB991548
, MB990662 and MB991549.
2004 Mitsubishi Endeavor LS
2004 STEERING Power Steering - Endeavor
Page 2858 of 3870
2. Bleed air, then turn the steering wheel several times while the vehicle is not
moving so that the temperature of the fluid rises to approximately 50 - 60°C
(122 - 140°F).
3. Start the engine and idle it at 700 +/- 100 r/min.
4. Fully close the shut-off valve of the pressure gauge and measure the oil pump
relief pressure to confirm that it is within the standard value range. Open it
again immediately after checking the pressure.
Standard value: 9.3 - 9.8 MPa (1,349 - 1,421 psi)
CAUTION: The pressure gauge shut-off valve must not
remain closed for more than 10 seconds.
2004 Mitsubishi Endeavor LS
2004 STEERING Power Steering - Endeavor
Page 2860 of 3870

5. If it is not within the standard value, replace the oil pump.
6. Check whether or not the hydraulic pressure is the standard value when no-
load conditions are created by fully opening the shut-off valve of the pressure
gauge.
Standard value: 0.8 - 1.0 MPa (116 - 145 psi)
7. If it is not within the standard value, the probable cause is a malfunction of the
oil line or steering gear, so check these parts and repair as necessary.
8. Turn the steering wheel all the way to the left or right; then check the retention
hydraulic pressure.
Standard value: 9.3 - 9.8 MPa (1,349 - 1,421 psi)
9. If not the standard value, overhaul or replace the steering gear. Remeasure
fluid pressure.
10. Remove special tools MB991548, MB990662 and MB991549, and then tighten
the pressure tube flare nut to the specified torque.
Tightening torque: 15 +/- 3 N.m (11 +/- 2 ft-lb)
11. Bleed the system (Refer to POWER STEERING SYSTEM AIR
BLEEDING
).
POWER STEERING PRESSURE SWITCH CHECK Required Special Tools:
MB990662: Power Steering Oil Pressure Gauge MB991548: Power Steering Oil Pressure Gauge Adapter (Pump Side) MB991549: Power Steering Oil Pressure Gauge Adapter (Hose Side)
1. Disconnect the pressure hose from the oil pump, and then connect the special
tools MB991548, MB990662 and MB991549.
2. Bleed air, and then turn the steering wheel several times while the vehicle is
not movin
g so that the tem
perature of the fluid rises to a
pproximatel
y 50 - 60°
2004 Mitsubishi Endeavor LS
2004 STEERING Power Steering - Endeavor
Page 3120 of 3870

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
Page 3121 of 3870
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
Page 3122 of 3870
Fig. 12: Status Of Operation Valve Specification
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
WHEN THE ABS FLUID PRESSURE IS DECREASING Fig. 13: ABS Fluid Pressure Is Decreasing Diagram
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
The system closes the inlet solenoid valve to shut the fluid channel from the master
c
ylinder, and o
pens the outlet solenoid valve to return the brake fluid from the
2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor
Page 3123 of 3870
wheel cylinders to the buffer chamber. This causes the wheel cylinder fluid pressure
to decrease. Then the system activates the pump motor to return the brake fluid
from the buffer chamber to the hydraulic unit reservoir.
Fig. 14: Status Of Operation Valve Specification
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
WHEN THE ABS FLUID PRESSURE IS HOLDING Fig. 15: ABS Fluid Pressure Is Holding Diagram
2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor
Page 3124 of 3870
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
.
The system closes the inlet solenoid valve and the outlet solenoid valve to hold the
brake fluid pressure in the wheel cylinders.
Fig. 16: Status Of Operation Valve Specification
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
WHEN THE ABS FLUID PRESSURE IS INCREASING
2004 Mitsubishi Endeavor LS
2004 BRAKES Traction Control, Active Skid Control System - Endeavor