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Home >> GMC >> 2002 >> Jimmy 2D Utility, Part Time, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1350 (Engine Control System (Introduction) - 1.8L (LV6)) >> Description and Operation >> Powertrain Control Module (PCM) Description >> Check Mode

Check Mode

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

The PCM has the ability to operate in the Normal mode or in the Check Mode.The 2 modes of operation are similar. When the PCM is operating in the Check mode, the PCM has an increased ability to detect malfunctions. The most significant feature of the Check mode operation is that all B type codes now run like A type codes. In order to request that the PCM operate in the Check Mode, scan tool communication with the PCM is necessary. For information on the use of the Check Mode in diagnosing driveability concerns, refer to Service Bay Test .

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