LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 197 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC P1258 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. 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/ECM will disable two groups of cylinders by turning OFF the fuel injectors. By switching between the two groups of cylinders, the PCM/ECM is able to reduce the temperature of the coolant.

scientia non olet · About LEMON Manuals