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P1113

IAT Sensor Open/Short.

  • Other
  • Powertrain
  • Manufacturer code
  • Low severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
1
AreaFuel and air metering
13
FaultThe specific fault in that area

What it means

P1113 is a manufacturer-specific code. On the vehicles where it is defined as 'IAT Sensor Open/Short', the engine control unit has seen the intake air temperature sensor signal go out of its expected range, either very high voltage (open circuit) or very low voltage (short to ground). The exact set conditions and thresholds depend on the make, model and engine. Other manufacturers use this same code for unrelated faults, so confirm the definition for the specific vehicle before diagnosing.

Symptoms

  • Engine warning light on
  • Hard or extended cranking when starting, especially from cold
  • Rough idle or hesitation while the engine is cold
  • Slightly poorer fuel economy
  • Intake air temperature reading on a scan tool stuck at an extreme value, such as very hot or very cold
  • Fault may come and go with vibration or when the engine bay heats up

Possible causes

  • Faulty intake air temperature sensor (internal open or short circuit)likely
  • Damaged, chafed or corroded wiring between the sensor and the control unit (open circuit or short to ground)likely
  • Loose, corroded or contaminated sensor connector terminalslikely
  • Sensor built into the air mass meter has failed, on models where the two are combinedpossible
  • Poor sensor ground or a short to the 5 volt reference supply shared with other sensorspossible
  • Internal fault in the engine control unitrare

How to diagnose

  1. Confirm the code definition applies to this make and model, then read and note the freeze frame data and any other stored codes, especially other sensor circuit codes.
  2. With the engine cold and after it has stood overnight, compare the live intake air temperature reading with the actual ambient temperature. It should be close.
  3. Check whether the reading is stuck at an extreme value, and whether it changes when you wiggle the sensor connector and wiring harness.
  4. Inspect the sensor, connector and harness for damage, chafing, heat damage, water ingress, corrosion or bent terminals.
  5. Unplug the sensor and watch the live reading. It should swing to the open-circuit extreme. Then bridge the connector terminals with a suitable jumper lead and check that it swings to the other extreme. This shows whether the wiring and control unit respond.
  6. Measure the sensor resistance and compare it with the manufacturer's temperature-resistance data for that model, as values vary between sensors.
  7. With the connector unplugged, check the reference voltage and ground at the harness side, and test the wiring for continuity and for shorts to ground or supply.
  8. Check whether the sensor is part of the air mass meter on this model, and follow the model-specific test procedure if so.

How to fix

  • Repair or replace damaged wiring, and secure the harness away from heat and sharp edges.
  • Clean or repair corroded connector terminals, or replace the connector if the terminals are damaged.
  • Replace the intake air temperature sensor if its resistance is out of specification or it is internally open or shorted.
  • Replace the air mass meter assembly where the sensor is integrated and cannot be supplied separately.
  • Rectify a shared reference or ground fault, then clear the codes and road test to confirm the fault does not return.

Can I keep driving?

Low severity

The car can usually be driven while you arrange a repair, as the control unit will use a substitute value. Expect poorer cold running and economy, and get it fixed soon to avoid drivability problems.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

This code for other makes

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