Symptoms

- Engine Light ON(or Service Engine Soon Warning Light) - Lack/Loss of power - Engine rough idle

Possible Causes

- Air leak between the MAF sensor and throttle body. - TP sensor not seated properly. - Damaged TP sensor. - Damaged MAF sensor.

Tech Notes

On some ION models the problem is an intake leak

Description

The PCM monitors a vehicle operation rationality check by comparing Throttle Position (TP) to Mass Air Flow (MAF) readings. If, during a self-test, the comparison of the TP sensor and MAF sensor readings are not consistent with the calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.