P1258
DTC P1258
Circuit Description
To reduce the engine temperature, the powertrain control module (PCM) has the ability to disable a number of fuel injectors during an engine over-temperature condition. The PCM considers the engine over temperature whenever the engine coolant temperature (ECT) reaches 129.4°C (264.92°F) for more than 10 seconds. This type A DTC sets, to show that the PCM detected an over-temperature condition and that the system engaged the protection mode.
DTC Descriptors
This diagnostic procedure supports the following DTC's:
DTC P1258 Engine Coolant Overtemperature - Protection Mode Active
Conditions for Running the DTC
^ DTC's P0116, P0117, P0118, P0125, P0128, P1114 or P1115, are not set.
^ The engine is running.
Conditions for Setting the DTC
The ECT reaches 129.4°C (264.92°F) or higher for more than 10 seconds.
Action Taken When the DTC Sets
^ The PCM will illuminate the malfunction indicator lamp (MIL) during the first trip in which the diagnostic test has been run and failed.
^ The PCM will disable selected fuel injectors.
^ The PCM will store conditions which were present when the DTC set as Freeze Frame and File Records data.
Conditions for Clearing the MIL/DTC
^ The PCM will turn the MIL OFF after 3 consecutive trips that the diagnostic has been run and passed.
^ The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using the scan tool Clear DTC Information function.
Diagnostic Aids
^ If an overheating condition exists, repair the overheat condition and change the engine oil and filter.
^ Using the Freeze Frame/Failure Records data may aid in locating an intermittent condition. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or fail. Operate the vehicle within the same Freeze Frame condition (RPM, load, vehicle speed, temperature etc.) that you observed. This will isolate when the DTC failed.
^ For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
