Intake Manifold Temperature Sensor 1
Indicates an abnormal reading from the intake manifold temperature sensor.
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What it means (plain English)
The engine's computer relies on a sensor to monitor the air temperature in the intake manifold. If the sensor is malfunctioning, the computer can't accurately adjust fuel and air ratios, which can result in poor performance or emissions issues.
What the computer is actually seeing
The engine control module (ECM) expects the intake manifold temperature to be within a certain range, typically between 20°C to 80°C (68°F to 176°F) when the engine is running under normal conditions. If the sensor reading falls outside this range, it triggers the fault code.
What a healthy reading looks like
Intake manifold temperature readings should typically be between 20°C to 80°C; values significantly outside this range (e.g., 0°C or 100°C) might indicate a sensor fault.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the intake manifold temperature sensor wiring for damage or loose connections. Decision: If wiring is intact, proceed to step 2; if damaged, repair or replace as needed.
- 22. Using a multimeter, check the voltage at the intake manifold temperature sensor connector with the engine running. Expect around 0.5V to 4.5V depending on temperature. Decision: If readings are within range, sensor may be bad; if out of range, investigate wiring further.
- 33. Remove the intake manifold temperature sensor; check for blockage or contamination. Decision: Clean if needed and retest; if sensor is damaged, replace with a new one. Ensure to clear the fault code after replacement.
Common causes
- Faulty intake manifold temperature sensor
- Wiring issues or short circuits in the sensor circuit
- Poor connectors or corrosion
- The engine is overheating or experiencing air leaks in the intake system
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's moderate severity; engine performance may be affected, so fix soon but it is drivable provisionally.
Will this code come back after I reset it?
It may return if the underlying issue is not fixed or if the sensor is faulty.
Why does this code sometimes pair with other intake sensor codes?
Multiple codes can indicate issues with the intake system, like temperature anomalies due to wiring flaws or sensor failures.
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