Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC'S 91-98, Cylinder Balance Fault: Notes
PCM is able to increase and decrease amount of fuel to each cylinder to provide smooth idle operation. DTCs 91-98 will set if too great of a fuel adjustment is required. These DTC's indicate a possible mechanical or fuel delivery problem. DTC's 91-98 will set when:
- Engine idling.
- Coolant at operating temperature.
- Cylinder fault constant.
- Fuel correction amount exceeds defined limits (internal to PCM) for 2 seconds.
PCM will default to rough idle. DTC will be stored as a current and history code, but will not turn on MIL.
- This step will determine if there is a specific cylinder at fault by using cylinder out (INJ. BALANCE). If a specific cylinder is not responding to cylinder cutout (RPM drop), this cylinder should be considered a suspect cylinder.
- This step will determine if a faulty duel mass flywheel is setting multiple cylinder balance DTCs.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.