P1297 No Change In MAP Sensor From Start to Run
NAME OF CODENo Change in MAP From Start to Run
WHEN MONITORED
With engine at idle, the throttle body at closed throttle and MpH = phi.
SET CONDITION
Too small a difference is seen between barometric pressure at ignition on and manifold vacuum (engine running) for 8.8 seconds.
THEORY OF OPERATION
This sensor measures manifold absolute pressure and ambient barometric pressure within the manifold. It provides a 0 to 5-volt signal to PCM cavity A27. The MAP sensor puts out a low voltage signal (0.5 to 1.8 volts) at idle when the manifold vacuum is high, and a higher voltage signal (3.9 to 4.5 volts) at deep throttle when the manifold vacuum is low. The MAP receives a 5-volt supply from PCM cavity A17 voltage may vary from 4.8 to 5.1 volts. The sensor ground is provided by PCM cavity A4.
POSSIBLE CAUSES
- Restricted or leaking vacuum/pressure to MAP sensor
- Ice in sensor or passage
- Failed sensor
- Failed PCM