LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 697 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC P1258 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The powertrain control module (PCM) or engine control module (ECM) uses the engine coolant temperature (ECT) sensor to monitor the engine for an over temperature condition. This condition occurs when the coolant temperature is above 128°C (262°F). When an over temperature condition is present, DTC P1258 will set. The PCM or ECM will disable 2 groups of cylinders by turning OFF the fuel injectors. By switching between the 2 groups of cylinders, the PCM or ECM is able to reduce the temperature of the coolant.

scientia non olet · About LEMON Manuals