2003 SSANGYONG MUSSO Service Manual

M162 ENGINE CONTROLS 1F1-69
HOT FILM AIR MASS (HFM) SENSOR
1 Housing
2 Protector Net
3 Electronic Housing
Removal & Installation Procedure
1. Turn the HFM sensor coupling in the direction shown in the figure in the right so that it gets separated from the contact surface. Notice Make sure the HFM sensor coupling connects completely with the contact surface Installation.
2. Remove the clip with a screw driver.
3. Pry off two tensioning clamps.
4. Remove the HFM sensor.
5. Installation should follow the removal procedure in the reverse order. 4 Connector
5 Hot film Sensor
6 Measuring Port

1F1-70 M162 ENGINE CONTROLS Circuit Diagram
1 Housing
2 Electronic Housing
3 Connector
R H : Heat Resistance
R T : Temperature Resistance
R S : Sensor Resistance

M162 ENGINE CONTROLS 1F1-71
If the measured value is not within the specified value, the possible cause may be in cable or HFM sensor in itself.Perform the 5V power supply inspection procedures.
HFM Sensor 5V Power Supply Inspection 1. Measure the voltage between the HFM sensor No.108 (+) and
No.105(-) after removing the HFM sensor connector.
HFM Sensor Input Voltage Inspection
1. Measure the HFM sensor signal voltage between the ECU
terminal No.103 and No.104.
Specified Value (coolant temperature is over 70 °C)
If the measured value is not within the specified value, the possible cause may be in cable or ECU coupling.
Iginition"ON ” 0.9 - 1.1 V
Engine at Idle 1.3 - 1.7 V
Specified Value 4.7 - 5.2 V
2. Measure the voltage between the HFM sensor wining connector terminal No.3 pin(-) and No.4 after removing the
HFM sensor connector.
Specified Value If the measured value is not within the specified value, the possible cause may be in cable or over voltage protection
relay. Perfrom the 12V power supple inspection procedures.
Specified Value 4.7 - 5.2 V
HFM Sensor 12V Power Supply Inspection
1. Measure the voltage between the HFM sensor wiring connector 1G No.2 pin(+) and No.104 after removing the
HFM sensor connector. If the measured value is not within the specified value, the possible cause may be in cable or over voltage protection
relay.
Specified Value 11 - 14 V

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

M162 ENGINE CONTROLS 1F1-75
COOLANT TEMPERATURE SENSOR
1 Artificial Resin Housing
2 Metal Housing
3 NTC (negative temperature coefficient) Resistor
Removal & Installation Procedure
1. Remove the pressure by opening the pressure cap in the coolant subtank.
2. Disconnect the connector and remove the coolant temperature sensor. Installation Notice Replace the seals with new one.
3. Installation should follow the removal procedure in the reverse order.
4. Check for leaks at each connections after starting the engine. 4 Connector
5 Coolant Temperature Sensor
Tightening Torque 18 - 22 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