P0113
 

P0113

Description
IAT SENSOR CIRCUIT HIGH VOLTAGE

Intake Air Temperature (IAT) sensor is a thermistor that
varies resistance based on temperature. As temperature of sensor
increases, resistance decreases. Low temperature will result in a high
signal voltage. DTC will set when PCM sees an IAT sensor voltage of
greater than 5 volts.
Symptoms
SES Service Engine Soon light

Causes

• Defective IAT sensor
• Loose or corroded connection at IAT sensor
• Open in IAT ground circuit or signal circuit
• Short to voltage in IAT signal circuit or reference circuit
• IAT harness and/or wiring routed too close to high-voltage wiring such as alternator, spark plug cables, etc.

Possible Solutions

• Inspect connection at IAT, clean if needed
• Test wires for short or open circut
• Check routing of wires and move away from high voltage wires
• Replace IAT sensor