If the vacuum hose to a MAP sensor were to rupture, what would the likely result be? A) The engine would continue to run well because the O₂ sensor is the primary sensor B) The PCM would go into open loop and run the engine excessively lean C) The PCM would go into open loop and run the engine excessively rich D) The PCM would see this sensor as being out of normal operating limits

Question

Quizplus · Accepted Answer

The PCM would go into open loop and run the engine excessively rich.The MAP sensor is used to measure the pressure in the intake manifold. This information is used by the PCM to calculate the amount of fuel to inject into the engine. If the vacuum hose to the MAP sensor were to rupture, the PCM would not be able to get an accurate reading of the intake manifold pressure. This would cause the PCM to go into open loop and run the engine excessively rich.

If the Vacuum Hose to a MAP Sensor Were to Rupture