DTC P0011100 – Intake Air Temperature (IAT) Sensor Circuit Range/Performance.

✅ DTC P0011100 — Intake Air Temperature Sensor Circuit Range/Performance

Meaning:
The ECM detects that the IAT sensor signal does not match expected values based on ambient temperature, coolant temperature, MAF sensor, or engine operating conditions.

This is a Range/Performance code — wiring is usually partially faulty, or the sensor is reading inaccurately, not fully open/short.

🔧 Common Causes

Sensor / Wiring

IAT sensor contaminated with dust/oil

Faulty IAT sensor (thermistor drift)

Loose connector or corrosion

High resistance in wiring (partial open)

Short-to-ground or short-to-voltage (intermittent)

Air Intake Issues

Aftermarket air filters causing turbulence

Intake pipe leaks between MAF & throttle body

Hot engine bay air entering intake

Related Sensor Issues

Faulty MAF sensor (incorrect airflow temperature correlation)

Incorrect ECT (engine coolant temp) readings

Incorrect intake air ducting after service

🔍 Symptoms

Poor fuel economy

Rough idle

Hesitation on acceleration

Black smoke (rich mixture)

Hard cold start

MIL ON

🧰 Diagnostic Procedure (Step-by-Step)

1. Read Live Data (Important)

Check the IAT reading on scanner:

Engine cold: IAT ≈ Ambient air temperature

Idling warm: IAT may rise 10–20°C above ambient

If the values are:

Very high (~130°C+) → short to ground

Very low (–40°C) → open circuit

❗ Range/performance codes mean the reading is “logical but incorrect.”

2. Inspect Sensor & Intake Duct

Check for oil/dust on IAT sensor tip → Clean with MAF cleaner

Check cracks/leaks in intake hose

Ensure air filter box is fully sealed

No wiring touching hot components

3. Check Connector and Wiring

Unplug IAT sensor → inspect:

Green corrosion

Loose pins

Damaged insulation

Wiring test:

Reference voltage: 5V supply

Signal voltage KOEO:

Cold: ~3.0–4.0V

Warm: ~1.0–2.0V

If voltage does not change with temperature:

Sensor faulty

Wiring resistance too high

4. Test IAT Sensor Resistance

Remove sensor and measure resistance:

Temperature Typical IAT Resistance

0°C 10–12 kΩ
20°C 2.5–3 kΩ
40°C 1–1.2 kΩ
80°C 300–400 Ω

If values don’t follow curve → replace sensor.

5. Check MAF & ECT Correlation

ECM compares:

IAT vs MAF temp

IAT vs ECT on cold start

If ECT reads wrong → it will trigger IAT range/performance.

6. Smoke Test (If Needed)

Air leaks between MAF and throttle body can cause wrong air temperature readings.

🔧 Most Common Fixes

Clean or replace IAT sensor

Repair connector (very common)

Fix intake pipe leak

Replace faulty MAF (if temperature correlation off)

Correct wiring resistance or poor ground

Replace air filter box seal

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