What Is MAP Sensor?
The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. The computer uses it to calculate engine load and, on speed-density systems, to calculate airflow and fueling in place of a MAF sensor.
In plain English
Manifold pressure reflects how hard the engine is working: high vacuum at idle, near-atmospheric at wide-open throttle, boosted pressure on turbocharged engines. The MAP sensor turns that into the load signal the computer fuels from.
A skewed MAP sensor — reading too high or too low — skews load calculation, causing fueling and drivability faults. On turbo engines, MAP data also verifies that the turbo is producing requested boost.
Example
Related trouble codes
Run your entire auto repair shop from one platform
AI diagnostics, repair guides, estimates, invoices, scheduling, CRM, inventory, and analytics — every feature in one plan, starting at $99/month with a 3-day free trial.
Start Free Trial$99/month · 3-day free trial · Cancel anytime · 2 months free annually
Related