Fuel Injection Quantity Control
Indicates a problem with the fuel injection quantity control system.
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 (ECU) is trying to manage how much fuel goes into the engine, but it's not able to control it properly.
What the computer is actually seeing
The ECU monitors the fuel injection rate and compares it to the expected levels based on inputs from the fuel pressure sensor and temperature sensor; any deviation can trigger the P3002 code.
What a healthy reading looks like
Injection timing should ideally be within 3-5 milliseconds of target specifications under typical operating conditions, with fuel pressure around 30-60 PSI.
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 for any wiring damage or corrosion at the fuel injector and related sensors. If you find issues, repair or replace connectors as needed.
- 2Verify fuel levels in the tank. Ensure that it's above a quarter tank to prevent lean conditions.
- 3Test the fuel pressure while the engine is running. It should fall within the expected range of 30-60 PSI. If it's low, check the fuel filter and pump.
- 4Measure the fuel injection signal using a scan tool. If the duty cycle is excessive or insufficient compared to specifications, further diagnose the injector itself or the control module.
- 5If all previous checks are fine, consider testing the fuel temperature sensor and the ECU for faults.
Common causes
- Faulty fuel injector
- Failure in the fuel pressure regulator
- Low fuel pressure due to a clogged fuel filter or pump issues
- Faulty fuel temperature sensor
- Issues with the wiring or connectors to the fuel injectors
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best not to drive long distances as it could impact fuel efficiency and may cause additional engine damage.
Will this code come back after I clear it?
If the underlying issue isn't resolved, the code is likely to return.
Why are other codes related to fuel injection appearing with this one?
They often indicate related or cascading issues with the injection system, so it’s a good idea to address them together.
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