SSANGYONG Rexton Y200 Manual page 479

1F1-52 M162 ENGINE CONTROLS
Failure
Description
Code
Intake air temperature
03
sensor low voltage
Intake air temperature
04
sensor high voltage
Intake air temperature
sensor plausibility
05
Mass air flow sensor
plausibility
09
Mass air flow sensor
10
low voltage
Mass air flow sensor
11
high voltage
Circuit Description
The heated element on the MAF is a platinum film resistor (heater). It is located on a ceramic plate together with
the other elements in the bridge circuit. The temperature sensitive resistor (flow sensor) also included in the
bridge. The separation of heater and flow sensor facilitates design of the control circuitry. Saw cuts are employed
to ensure thermal decoupling between the heating element and the intake air temperature (IAT) sensor. The
complete control circuitry is located on a single layer. The voltage at the heater provides the index for the mass
air flow. The MAF's electronic circuitry then converts the voltage to a level suitable for processing in the ECM.
This device does not need a burn off process to maintain its measuring precision over an extended period. In
recognition of the fact that most deposits collect on the sensor element's leading edge, the essential thermal
transfer elements are located downstream on the ceramic layer. The sensor element is also design to ensure that
deposits will not influence the flow pattern around the sensor.
The IAT sensor uses a thermistor to control the signal voltage to the ECM. The ECM supplies 5 volt reference and
a ground to the sensor. When the air is cold, the resistance is high; therefore the IAT signal voltage will be high.
If the intake air is warm, resistance is low; therefore the IAT signal voltage will be low.
Trouble Area
IAT sensor short circuit to
ground or open
IAT sensor short circuit to
power
Malfunction in recognition of
IAT
When functional problem
Malfunction in recognition of
MAF
When air mass not plausible
MAF sensor short circuit to
ground or open
MAF sensor short circuit to
power
Maintenance Hint
•
Monitoring the actual air temperature
through scan tool
•
Inspection the ECM pin 80, 79 about
short circuit or open with bad contact
•
Inspection the IAT sensor (integrated in
HFM sensor)
•
Inspection the ECM
•
Monitoring the actual air mass flow
through scan tool
•
Inspection the ECM pin 81, 105 about
short circuit or open with bad contact
•
Inspection the MAF sensor (integrated 11
in HFM sensor)
•
Inspection the ECM
YAD1F440
SSANGYONG Y200