P0113 - Intake Air Temperature Sensor Circuit High: Notes

Theory of Operation 

Intake Air Temperature Sensor performance looks at the outputs of three temperature sensors and compares them under cold start conditions. Following a start to run delay time, the outputs of the Ambient, Engine Coolant and Intake Air Temperature sensors will be compared. If the Engine Coolant and Ambient Air Temperature Sensors agree, and the Intake Air Temperature does not agree, the Intake Air Temperature Sensor is declared as irrational. If declared irrational a second comparison will be done after a short drive cycle.

• >>When Monitored:<< With the ignition on and the battery voltage greater than 10.4 Volts.
• >>Set Condition:<< The Powertrain Control Module (PCM) detects that the Intake Air Temperature (IAT) Sensor input voltage is above the maximum acceptable value.

POSSIBLE CAUSES
(K21) IAT SIGNAL CIRCUIT SHORTED TO VOLTAGE
(K21) IAT SIGNAL CIRCUIT OPEN
(K900) SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE
INTAKE AIR TEMPERATURE (IAT) SENSOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to Pre-Diagnostic Troubleshooting Procedure .