2003 SSANGYONG MUSSO ECU

1F1-72 M162 ENGINE CONTROLS
OXYGEN SENSOR
1 Electricity Wire
2 Oxygen Sensor Housing
3 Sensor Ceramic
4 Electrode (Internal)
5 Electrode (External)
6 Heating Coil
7 Open Space
8 Protector Tube
Functions The oxygen sensor optimizes the combustion (Air-Fuel Ratio 14.7:1) and resets the Air-fuel ratio in the ECU after sensingthe amount of oxygen from the exhaust gases to diminish the exhaust gases.
- Rich(<1) above approx. 450mV
- Lean(>1) below approx. 450mV
Locatoin of Sensor Oxygen sensor is located on the front exhaust pipe.

M162 ENGINE CONTROLS 1F1-73
Oxygen Sensor Signal Voltage Inspection
1. Measure the oxygen sensor signal voltage between the ECUterminal No.11 and No.9. Maintain the engine speed ia at idle while the coolant temperature is over 80 °C.
If the measured value is not within the specified value, thepossible cause may be in cable, oxygen sensor or ECU.
Oxygen Sensor Heating Voltage Inspection
1. Measure the oxygen sensor heating voltage between the ECU terminal No.11 and No.9. Maintain the engine speed ia at idle while the coolant temperature is over 80 °C.
If the measured value is not within the specified value, the possible cause may be in cable, oxygen sensor or ECU.
Oxygen Sensor Heating Current Consumption
Inspection
1. Measure the oxygen sensor heating current consumption between the ECU terminal No.9 and No.5 while the ignition switch is in "ON" position. If the measured value is not within the specified value, the possible cause may be in cable, oxygen sensor or ECU.
Specified Value 0.2 - 2.0 A
Specified Value -0.2 - 1.0 V
Specified Value 11 - 14

1F1-74 M162 ENGINE CONTROLS
KNOCK SENSOR
Functions Vibration of the engine block is transmitted to the sensor and transferred to the ECU in the form of an alternating voltage signal via a shielded cable. The knock sensor is fastened to the engine block to recognize knocking in all cylinders. TheECU compares the signal and the retards firing point. Removal & Installation Procedure
1. Disconnect the knock sensor connector from the intakemanifold bracket.
2. Unscrew the mounting bolt (M8 X 28) from the knock sensor installed on the cylinder block and remove the knocking
sensor. Installation Notice
3. Installation should follow the removal procedure in the reverse order.
Tightening Torque 22.5 - 27.5 Nm

1F1-76 M162 ENGINE CONTROLS 2. Measure the resistance between the coolant temperaturesensor terminal No.1 and No.4 with the coolant temperature sensor disconnected.
Inspection 1. Measure the coolant sensor input voltage between the ECU
terminal No.79 and No.78 while the ignition switch in "ON" position. Notice Replace wiring and coolant temperature sensor if out of specified value. allowable error :
±5%
allowable error : ±5%
Voltage (V)
3.57 1.220.78
Temperature (
°C)
203040
Resistance (W) 2,500322 185
Temperature (
°C)
203040

M162 ENGINE INTAKE & EXHAUST 1G1-3
Removal & Installation Procedure1. Release the clamp securing HFM sensor and air cleaner.
2. Disengage the air cleaner assembly and HFM sensor assembly.
3. Unserew the mounting bolt(6) from the bracket.
Installation Notice
Tightening Torque 22.5 - 27.5 Nm
4. Release the clamp from air cleaner assembly housing and remove the cover.
5. Remove the air cleaner assembly.
6. Remove the air cleaner housing from insulator.
Notice
Make sure the air cleaner to be seated in insulator.
7. Disengage the air duct hose and air cleaner housing and remove the housing.
8. Remove the air duct hose.
9. Unscrew the two bolts(7) from air inlet duct. Installation Notice
10. Remove the air inlet duct.
11. Installation should follow the removal procedure in the reverse order.
Tightening Torque 8 - 9 Nm

1G1-8 M162 ENGINE INTAKE & EXHAUST
Function Description A pneumatically actuated resonance flap (5) is located on the intake manifold, and will be opened and closed by load, whichoperates resonance flap according to engine and controlled by ECU and rpm.
1. Resonance flap closed (at idle/partial load : less than3,800/rpm) The switch valve (7) will be adjusted by ECU and resonance falp will be colosed. By increasing air flow passage throughdividing intaking air flow toward both air collection housing(8). This leads to a signficant increase in the torque in thelower speed range.
2. Resonance flap open (at full load : over 3,800/rpm) The switch valve (7) will not be adjusted by ECU andresonance falp (5) will be open. The colllected air in the aircollection housing (8) will not be divided and intaking airpassage will be shorten.

M161 ENGINE INTAKE & EXHAUST 1G2-3
Removal & Installation Procedure1. Release the clamp securing HFM sensor and air cleaner.
2. Disengage the air cleaner assembly and HFM sensor assembly.
3. Unserew the mounting bolt(6) from the bracket.
Installation Notice
Tightening Torque 22.5 - 27.5 Nm
4. Release the clamp from air cleaner assembly housing and remove the cover.
5. Remove the air cleaner assembly.
6. Remove the air cleaner housing from insulator.
Notice
Make sure the air cleaner to be seated in insulator.
7. Disengage the air duct hose and air cleaner housing and remove the housing.
8. Remove the air duct hose.
9. Unscrew the two bolts(7) from air inlet duct. Installation Notice
10. Remove the air inlet duct.
11. Installation should follow the removal procedure in the reverse order.
Tightening Torque 8 - 9 Nm

SUSPENSION DIAGNOSIS 2A-5
INPUT & OUTPUT DEVICES AND DAMPING FORCECONTROL LOGIC
INPUT & OUTPUT DEVICES Damping force of shock absorber will rotate shock absorber control rod in 3 modes by driving actuator on the upper shock absorber when signaled from ECS. Rotary valve in the shock absorber will control hydraulic flow according to rotation of control rod to adjust damping force of shock absorber in SOFT MEDIUM HARD.
SYSTEM LAYOUT
1 ECS (ECU)
2 Body Vertical Acceleration Sensor (Vertical Sensor)
3 Body Lateral Acceleration Sensor (Lateral
Sensor)
Speed Sensor
Axle Vertical Acceleration Sensor (Wheel G Sensor)
Stop Lamp Switch
Body Vertical Acceleration Sensor (Vertical Sensor)
ECS Switch
Indicator Lamp
Actuator
Shock Absorber
Self-Diagnosis Connector
Damping Force Adjustment
ECS
(ECU)
Body Lateral Acceleration Sensor (Lateral Sensor)
4 ECS Mode Switch
5 Stop Lamp Switch
6 Axle Vertical Acceleration Sensor (Wheel G
Sensor)
7 Mode Actuator