Air Charge Temperature Sensors
Air Charge Temperature Sensors (ACT)
Manifold Air Temperature Sensors (MAT)
Intake Air Temperature Sensors (IAT)
Air Charge Temperature Sensors (ACT), also referred to as Manifold Air Temperature Sensors (MAT) or Intake Air Temperature Sensors (IAT), measure the air temperature entering the engine and sends this information to the vehicle’s onboard computer (Powertrain Control Module or PCM). The PCM uses this information to estimate air density, allowing it to balance the air/fuel ratio. Hot air is less dense than cold air, so each type of environment requires a specific air/fuel mixture.
Common causes of an Air Charge/Manifold/Intake Temperature Sensor failure:
• Poor maintenance. Many automotive shops routinely overlook servicing the air temperature sensors
• Build-up of oil and debris over time, generally relating to the age and wear of sensor
Symptoms of a failing Air Charge/Manifold/Intake Temperature Sensor may include:
• Lack of power when accelerating
• Decrease in fuel efficiency
• Rough idling or running
• Difficult engine start
• Check Engine Light on
The following OBD II error codes are the most commonly found with this product type. On-Board Diagnostic (OBD) systems are integrated into the computers of our vehicles to monitor emissions. The first generation of OBD requirements was implemented in California in 1988. Since then, these requirements were adopted by the US EPA for all passenger vehicles manufactured after 1996. In 2005, OBD systems then also became mandatory for heavy-duty vehicles and engines up to 14,000 lbs. GVWR. In 2008 the EPA finalized OBD regulations for 2010 and later heavy-duty engines used in highway vehicles over 14,000 lbs. GVWR and made changes to the OBD requirements for heavy-duty applications up to 14,000 lbs. GVWR to align them with requirements for applications over 14,000 lbs. GVWR.
OBD II is now the standard in diagnosing vehicle emissions in. The codes listed for this product type are common instances that may relate to your vehicle and should be used as a guide only. Walker Products will not be held responsible for any use of this information. It is highly suggested that you consult with a professionally trained mechanic prior to any automotive repair, and that you follow all vehicle manufacturer and EPA guidelines for removal, replacement, diagnostics, OBD II code clearing, ECU and PCM relearn procedures.
o P0070 Ambient Air Temperature Sensor Circuit
o P0071 Ambient Air Temperature Sensor Range/Performance
o P0072 Ambient Air Temperature Sensor Circuit Low
o P0073 Ambient Air Temperature Sensor Circuit High
o P0074 Ambient Air Temperature Sensor Circuit Intermittent
o P0095 Intake Air Temperature Sensor 2 Circuit
o P0096 Intake Air Temperature Sensor 2 Circuit Range/Performance
o P0097 Intake Air Temperature Sensor 2 Circuit Low
o P0098 Intake Air Temperature Sensor 2 Circuit High
o P0099 Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic
o P009A Intake Air Temperature/Ambient Air Temperature Correlation
o P00A5 Intake Air Temperature Sensor 2 Circuit
o P00A6 Intake Air Temperature Sensor 2 Circuit Range/Performance
o P00A7 Intake Air Temperature Sensor 2 Circuit Low
o P00A8 Intake Air Temperature Sensor 2 Circuit High
o P00A9 Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic
o P00AA Intake Air Temperature Sensor 1 Circuit
o P00AB Intake Air Temperature Sensor 1 Circuit Range/Performance
o P00AC Intake Air Temperature Sensor 1 Circuit Low
o P00AD Intake Air Temperature Sensor 1 Circuit High
o P00AE Intake Air Temperature Sensor 1 Circuit Intermittent
o P0110 Intake Air Temperature Sensor 1 Circuit
o P0111 Intake Air Temperature Sensor 1 Circuit Range/Performance
o P0112 Intake Air Temperature Sensor 1 Circuit Low
o P0113 Intake Air Temperature Sensor 1 Circuit High
o P0114 Intake Air Temperature Sensor 1 Circuit Intermittent
o P011B Engine Coolant Temperature/Intake Air Temperature Correlation
o P011C Charge Air Temperature/Intake Air Temperature Correlation
o P011D Charge Air Temperature/Intake Air Temperature Correlation
o P0127 Intake Air Temperature Too High
o P2199 Intake Air Temperature Sensor 1/2 Correlation