Fuel Metering Unit Failure
The fuel metering unit is not functioning correctly.
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What it means (plain English)
The system that controls how much fuel your engine gets isn't working right, which can lead to too little or too much fuel being delivered to the engine.
What the computer is actually seeing
The engine control module (ECM) detects a signal outside the normal range from the fuel metering unit, indicating it's not managing the fuel flow properly. This could show up as voltage readings between 0.5 and 4.5 volts when it should be around 1.5 volts during normal operation.
What a healthy reading looks like
Expected voltage from the fuel metering unit should be within 1.5V to 4.5V, depending on demand; below or above indicates issues.
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 for visible damage to wiring and connectors related to the fuel metering unit. Repair any issues found. Decision Point: Were any issues found?
- 22. Test the voltage at the fuel metering unit connector; it should be between 1.5V and 4.5V. Decision Point: Is the voltage within range?
- 33. If voltage is not within range, test the fuel metering unit by substituting with a known good unit. Decision Point: Does the issue persist with the new unit?
- 44. Inspect the fuel supply lines and filters for blockages or contamination. Ensure adequate fuel flow. Decision Point: Is fuel flow normal?
- 55. If normal, check the ECM for fault codes or failures. Consider reprogramming or replacing the ECM if no other issues are found.
Common causes
- Faulty fuel metering unit
- Wiring or connector issues (shorts, opens)
- ECM failure
- Fuel contamination or blockage
- Air in the fuel system
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it's not safe; driving can lead to engine damage due to improper fuel delivery.
Will the code come back after clearing it?
Yes, if the underlying issue isn't fixed, the code will return.
Why does this code pair with SPN 1167?
SPN 1167 indicates a problem with the fuel system pressure; issues in fuel metering can affect fuel pressure.
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