P0112,P0113
Symptom: CHECK ENGINE lamp on
Intake air temperature sensor, input to control module low/high,
faulty, no continuity or shorting to ground/batt+
Fault symptom
CHECK ENGINE lamp on
Condition
The sensor reading is above 140°C (284°F) or below -35°C (-31°F)
more than one minute after starting and the engine idling for more than ten
seconds.
Note
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In the event of a malfunction, the control module adopts a
preprogrammed value corresponding to 20°C (68°F).
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1.
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Check the operation of the
temperature sensor with the ISAT command
"INTAKE AIR TEMP" in the "READ FUNCTIONS" menu.
If the temperature sensor is in proper working order,
the ISAT should show a temperature of 20-30°C when the engine is hot.
If this is the case, proceed with point 6. If it is not, continue as
described below.
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2.
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Unplug the temperature sensor connector and check the resistance of
the sensor by taking a reading across its pins.
The correct resistance is shown in the table.
C°
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F°
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Resistance (kilo-
ohms)
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-10
|
14
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8.3-10.6
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20
|
68
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2.3-2.7
|
40
|
104
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1.0-1.3
|
60
|
140
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0.56-0.67
|
80
|
176
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0.29-0.37
|
90
|
194
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0.20-0.24
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If the resistance is not correct, change the temperature
sensor.
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3.
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With the temperature sensor connector still unplugged, and with the
ignition switch in the Drive position, check the voltage across pins 1
and 2 of the connector.
The voltage should be 5 V. If it is not, continue with the next point.
If the voltage is OK, proceed to point 6.
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4.
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Check the lead between pin 44 of the connector and pin 1 of the
sensor's connector for continuity/shorting.
Rectify the wiring if it is defective, or continue as
described below.
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5.
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Check whether pin 2 of the sensor's connector is properly connected to
sensor ground on pin 30 of the control module.
Rectify the ground lead if it has a fault, or continue with the next point.
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6.
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Clear all trouble codes and drive the car to check whether the trouble
code is generated afresh. If it is, turn to
for further
diagnostic instructions.
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