Inlet Manifold Temperature Sensor Fault
Inlet manifold temperature sensor is out of range or shorted.
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What it means (plain English)
The inlet manifold temperature sensor measures how hot the air is flowing into the engine; if it's bad, the engine might not get the right amount of fuel or air.
What the computer is actually seeing
The engine control module (ECM) sees unusual voltage levels from the inlet manifold temperature sensor, usually lower than 0.3 volts or higher than 4.5 volts, indicating a fault with the sensor or its circuit.
What a healthy reading looks like
Normal operation should see voltage around 0.5 to 2.5 volts at specified temperatures.
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. Check the wiring and connector to the inlet manifold temperature sensor for damage or corrosion. If damage is found, repair or replace as necessary.
- 22. Measure the voltage at the sensor connector with the ignition on (engine off) and you should see a voltage between 0.5 and 2.5 volts. If outside this range, proceed to step 3.
- 33. Disconnect the inlet manifold temperature sensor and measure the resistance of the sensor. Compare against manufacturer specifications; if out of spec, replace the sensor.
- 44. If the wiring and sensor check out, inspect the ECM for faults that could cause erroneous readings.
Common causes
- Faulty inlet manifold temperature sensor
- Wiring issues (chafed or frayed wires)
- Bad connector or corroded terminals
- Open circuit or short to ground in the sensor circuit
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advisable to fix soon; drivability could be affected and engine performance might decrease.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code pair with SPN 3862?
SPN 3862 typically indicates issues related to the same sensor, often triggered under similar conditions.
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