P0113

DIAGNOSTIC TROUBLE CODES PO112, PO113
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: In the event of a malfunction, the control module adopts a preprogrammed value corresponding to 20°C (68°F).

Diagnostic Procedure.
1. 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 2O-30°C when the engine is hot.

If this is the case, proceed with step 6.
If it is not, continue as described below.

2. Unplug the temperature sensor connector and check the resistance of the sensor by taking a reading across its pins.

Resistance Table:

The correct resistance is shown in the table.
If the resistance is not correct, change the temperature sensor.





3. 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 step.
If the voltage is OK, proceed to step 6.

4. 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.

5. 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.

6. Clear all trouble codes and drive the car to check whether the trouble code is generated afresh.

If it is, continue at "Before Control Module Replacement" for further diagnostic instructions. Before Replacing A Control Module