Intake Manifold Temperature Sensor 1 - Voltage Above Normal, or Shorted to High Source
The intake manifold temperature sensor is reading too high.
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What it means (plain English)
The intake manifold temperature sensor measures how hot the air is, but it's sending a signal that says it's hotter than it actually is — usually above 200°F (93°C).
What the computer is actually seeing
The engine control unit (ECU) is receiving a voltage signal from the intake manifold temperature sensor that exceeds the normal operating range, often seen as a voltage reading above 5 volts.
What a healthy reading looks like
Normal voltage for the sensor should be around 0.5 to 4.5 volts depending on temperature; anything above 5 volts indicates an issue.
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 intake manifold temperature sensor for damage or corrosion. If damaged, repair or replace as necessary.
- 2Using a multimeter, measure the voltage at the sensor connector with the ignition on, engine off. You should see values between 0.5 to 4.5 volts. If above 5 volts, further investigation is needed.
- 3Disconnect the sensor and measure the resistance of the sensor. Check it against manufacturer specifications; typically, a good sensor should show consistent resistance values. If it's shorted or open, replace the sensor.
- 4If no wiring issues and the sensor checks out, suspect an ECU fault which may require reprogramming or replacement.
Common causes
- Wiring harness issues (short to power)
- Faulty sensor
- Corrosion or bad connector at sensor
- ECU malfunction
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but not recommended long-term; the higher temperature readings might affect performance and emissions.
Will this code come back after clearing it?
If the underlying issue isn't fixed, the code will likely return.
Why does this code show up with other codes?
These codes often indicate related issues with sensor readings that affect engine performance and temperature management.
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