2001 Chevrolet/Geo Camaro  

DTC P1112

Circuit Description

The intake air temperature (IAT) sensor is a thermistor which measures the temperature of the air entering the engine. The powertrain control module (PCM) applies 5 volts through a pull-up resistor to the IAT sensor. If the intake air is cold, the sensor resistance is high, and the PCM will monitor a high signal voltage on the IAT signal circuit. If the intake air is warm, the sensor resistance is lower causing the PCM to monitor a lower voltage. DTC P1112 will set when the PCM detects an intermittently low signal voltage on the IAT sensor signal circuit.

Conditions for Running the DTC
Conditions for Setting the DTC
Action Taken When the DTC Sets
Conditions for Clearing the DTC
Diagnostic Aids

If the condition is intermittent, refer to Intermittent Conditions

Step

Action

Yes

No

Schematic Reference: Engine Controls Schematics

1

Did you perform the Diagnostic System Check-Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

2

With a scan tool, select diagnostic trouble codes (DTC).

Does the scan tool indicate DTC P0112 also set?

Go to DTC P0112

Go to Step 3

3

Test the IAT sensor signal circuit for an intermittent short to ground and repair as necessary. Refer to Testing for Intermittent and Poor Connections , and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 4

Go to Diagnostic Aids

4
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC run and pass?

Go to Step 5

Go to Step 2

5

With a scan tool, observe the stored information, Capture Info.

Does the scan tool display any DTCs that you have not diagnosed?

Go to Diagnostic Trouble Code (DTC) List

System OK