Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

This diagnostic will set when the control circuit does not follow the PCM command. When the solenoid is requested ON, the voltage will drop. When the solenoid is OFF, the ignition voltage will be present. The scan tool has a 5 second ON time abort. The wastegate solenoid can be commanded ON for as many times as needed, in 5 second intervals. DTC P0236 may possibly set along with DTC P1656. This diagnostic can be checked during key up. The engine will not respond to the scan tool commands at the idle. The engine is unable to achieve the boost pressures that are more than Barometric (BARO) pressure at idle. The engine will also not respond to the scan tool commands at any engine speed which is more than the idle. The PCM control abort in order to prevent the engine damage.