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.
Monitor Description: Notes
The intake air flow meter sub-assembly is a sensor that measures incoming air flow from the throttle valve. The ECM determines a length of time fuel is injected based on this information to provide an appropriate air/fuel ratio. The intake air flow meter sub-assembly is integrated with platinum filament, which is contact with induction air. When a specific amount of voltage is applied from the ECM, it is heated to a predetermined temperature. Also, induction air cools the platinum filaments and the integrated thermistor to cause a change in resistance. In order to maintain an electric current at a constant level, the electric current which is sent to the intake air flow meter sub-assembly is adjusted by the ECM. The voltage level is proportional to a flow rate measured by the sensor. The ECM uses this information is used to calculate an amount of induction.
An average engine load value ratio is monitored by the ECM to check the intake air flow meter sub-assembly for malfunction. An average engine load value ratio is a result of comparison between an average engine load as calculated from the intake air flow meter sub-assembly output and an average engine load as estimated based on operating conditions (such as engine speed and throttle opening angle). When the average engine load value ratio is less than a threshold value, the ECM judges that induction flow rate is low. On the other hand, when the average engine load value ratio exceeds the threshold value, the ECM judges that induction flow rate is high.
If this condition is detected consecutively in 2 drive cycles, the MIL illuminates and the DTC is stored.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.