P1193 - FAULT CODE - OBD2

P1193 Code failures by brands

P1193 CHRYSLER, DODGE, JEEP: INLET AIR TEMPERATURE SENSOR CIRCUIT HIGH CONDITION

Description of DTC code P1193

The IAT (Intake Air Temperature Sensor) is a wire thermistor whose resistance and signal voltage drop as the intake air temperature does. With the engine cold, the voltage is provided through a high resistance circuit in the Powertrain Control Module (PCM). If the engine is warm, this voltage is sent through a low resistance circuit in the same controller. With this dual PCM circuit, there is greater accuracy of the IAT in the general temperature ranges.

On an ongoing basis, the Powertrain Control Module monitors the IAT Sensor voltage to determine how dense the air is due to temperature, which is used for fuel calculations. This circuit is monitored when the engine is running.

The DTC P1193 OBDII is a code that manufacturers such as Chrysler, Dodge, and Jeep use to indicate the PCM has detected the IAT Sensor voltage is greater than 4.9 volts.

Symptoms of fault code P1193

Check Engine Lamp ON.
Lower fuel efficiency.
During cold starts, the engine power is lower than usual.
Instabilities during idling.

Causes of OBD2 P1193

Reason to set the P1193 OBD2 diagnostic code:

Inlet Air Temperature Sensor wires or connectors may be in poor condition.
The IAT Sensor circuit may be shorted.
The Inlet Air Temperature Sensor may be faulty.

Possible solutions of the DTC code P1193

Steps to solve the P1193 OBDII fault code:

Consult the Technical Service Bulletins.
Check the IAT Sensor wiring and verify that it is not malfunctioning due to burns or wear. Make repairs or replacements as required if you find any of the above conditions.
Check the integrity of the Inlet Air Temperature Sensor circuit connections and measure their voltages. These readings should be within the manufacturer's specifications. If you find an out-of-range voltage, make repairs.
Measure the resistance of the Inlet Air Temperature Sensor, and check if it is within the parameters for good sensor performance. If not, replace it.