Intake Manifold Temperature Sensor Low Circuit

The engine's computer checks the intake manifold temperature through a sensor; if it sees a voltage below a certain level (like 0.5 volts), it assumes there's a problem, often indicating a short or faulty sensor.

The ECU expects a voltage reading from the intake manifold temperature sensor typically between 0.5 to 4.5 volts, depending on the temperature. If the voltage drops below 0.2 volts, it triggers the code.

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.

1. 11. Visual inspection: Check the wiring and connectors of the intake manifold temperature sensor for damage, corrosion, or loose connections.
2. 22. Measure voltage: With the engine running, measure the voltage at the sensor connector. It should be between 0.5V and 4.5V. If it’s below 0.2V, proceed to step 3.
3. 33. Check continuity: Disconnect the ECM connector and check for continuity in the wires from the sensor to the ECM. There should be no breaks or shorts. If there's an issue, repair the wiring.
4. 44. Swap the sensor: If the wiring is good but the voltage is still low, replace the intake manifold temperature sensor and retest. If the code returns, check the ECM for faults.

• Faulty intake manifold temperature sensor
• Wiring issues or shorts in the sensor circuit
• Corroded or loose connector terminals
• Incorrect installation or relocation of the sensor

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