Fuel trims
Idle, then a steady 2,500 rpm. Plus means the ECU is adding fuel. Minus means it is taking fuel away. Inside ±10% is called normal here. That band is a guide, not a fault code.
Idle, then a steady 2,500 rpm. Plus means the ECU is adding fuel. Minus means it is taking fuel away. Inside ±10% is called normal here. That band is a guide, not a fault code.