Check Engine Lamp

The check engine lamp looks the same as the check engine lamp you are already familiar with, the Check Engine lamp.

Basically, the check engine lamp is turned on when the ECM detects a DTC that will impact the vehicle emissions.

• When the check engine lamp remains on while the engine is running, or when a malfunction is suspected due to a driveability or emissions problem, a Powertrain On-Board Diagnostic (OBD-II) System Check must be performed. The procedures for these checks are given in On-Board Diagnostic (OBD-II) System Check. These checks will expose faults which may not be detected if other diagnostics are performed first.