FUEL INJECTION SYSTEM: FUEL INJECTION CONTROL RANGE NOT OBSERVED
Fuel injection control is out of range or not functioning as expected.
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's computer isn't controlling the fuel injectors properly, causing either too little or too much fuel to be injected into the engine.
What the computer is actually seeing
The ECM is monitoring fuel flow and pressure from the injectors. It expects a specific range, typically between 200 µs and 400 µs pulse width for proper operation. If it sees values outside this range, it sets this code.
What a healthy reading looks like
Expected fuel injection pulse width is usually around 300 µs. If pulse width drops below 200 µs or exceeds 400 µs, a fault is indicated.
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 for the fuel injectors for damage or corrosion. Repair if needed. Decision: If wiring is good, proceed to step 2.
- 22. Measure the fuel injector pulse width using a scan tool while the engine is running. Expected value: 200-400 µs. Decision: If pulse width is within range, check other components; if not, go to step 3.
- 33. Inspect fuel pressure at the rail. Use a fuel pressure gauge to check for proper fuel pressure (desired pressure is typically around 50-60 psi). Decision: If pressure is low, check the fuel pump and filter; if normal, replace the injector.
Common causes
- Faulty fuel injector(s)
- Wiring issues to injector(s)
- Faulty fuel pressure regulator
- Air or vacuum leaks
- ECM failure
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; driving can lead to poor fuel economy and potential engine performance issues. Fix soon.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, the code will reappear.
Why does this code sometimes show with injection system codes?
Injection control issues often cause multiple related faults to trigger simultaneously.
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