FMI 16 - Abnormal Update Rate
ECU is reporting too slow or too fast data updates from a monitored parameter.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine control unit is expecting to get data from a sensor at a certain rate, but it's getting it either way too slow or way too fast. Think of it like trying to have a conversation with someone who is either speaking too slowly or rushing the words.
What the computer is actually seeing
The ECU expects data update intervals to fall within a set range, generally measured in milliseconds. If the data is received outside the 10-100 milliseconds range, it triggers a fault code.
What a healthy reading looks like
Data updates should typically occur every 10 to 100 milliseconds.
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 connectors between the sensor and the ECU for damage or corrosion. Repair as necessary. If wiring is intact, proceed to the next step.
- 22. Verify the sensor's output using a multimeter. Measure the voltage or signal frequency and compare it to the expected values provided by the service manual. If the readings are off, replace the sensor.
- 33. Inspect the ECU for any software updates or fault history. Ensure that the ECU is functioning correctly. If there are no issues, check for ground and power supply to the ECU.
Common causes
- Faulty sensor
- Wiring or connector issues
- ECU software error
- Excessive resistance in electrical connections
- Sensor mount or alignment problems
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you can drive, but address it soon to avoid potential engine performance issues.
Can this code come back after repair?
Yes, if the underlying issue isn't fixed properly, such as bad wiring or a faulty sensor.
Why does this code sometimes pair with other codes?
Other codes may indicate related issues with sensors or system parameters that share wiring or processing resources.
Working a real vehicle right now?
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