Inlet Manifold Temperature Sensor 1 - Abnormal Update Frequency
The engine's inlet manifold temperature sensor is reporting inaccurate or inconsistent data.
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What it means (plain English)
The computer is expecting a steady stream of temperature readings from the manifold sensor but is getting erratic signals instead. This can cause performance issues because the engine may not react properly to temperature changes.
What the computer is actually seeing
The engine control module (ECM) notices that the temperature readings from the inlet manifold sensor are fluctuating too much or not updating when they should. It typically expects smooth changes in temperature readings within a range of 0-120°C (32-248°F).
What a healthy reading looks like
Inlet manifold temperature should be stable, typically between 20-80°C (68-176°F) under normal operating conditions.
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.
- 1Check the wiring and connectors for the inlet manifold temperature sensor for frays, breaks, or corrosion.
- 2Test the sensor resistance. At 20°C (68°F), the typical resistance value should be around 2-3 kΩ. Check if it falls within specification throughout its operating range.
- 3Verify the ECM ground connection to ensure it has a good ground reference. A drop under load should be less than 0.1V.
- 4If the wiring and sensor check out, update the ECM software if applicable.
Common causes
- Faulty inlet manifold temperature sensor
- Wiring or connector issues
- Corrosion or short circuit in the sensor circuit
- ECM software glitch
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
Yes, but engine performance may be affected, so fixing it soon is a good idea.
Will this code come back after clearing it?
If the underlying issue isn't fixed, it likely will return.
Could this code be related to overheating issues?
Yes, if the sensor is malfunctioning, it may prevent the engine from detecting overheating.
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