Circuit Description
In order to reduce the engine temperature the 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 ECT reaches
a predetermined temperature. This DTC sets in order to show that
the PCM detected an over temperature condition and that the system
engaged the protection mode.
Conditions for Running the DTC
| • | DTCs P0117, P0118, P0125 are not set. |
Conditions for Setting the DTC
| • | The engine coolant temperature is greater than 132°C (270°F). |
| • | The above conditions present for greater than 10.0 seconds. |
Action Taken When the DTC Sets
| • | The PCM illuminates the Malfunction Indicator Lamp (MIL) when
the diagnostic runs and fails. |
| • | The PCM records the operating conditions at the time the diagnostic
fails. The PCM stores this information in the Freeze Frame and/or the Failure
Records. |
| • | The PCM alternately disables four fuel injectors. |
Conditions for Clearing the MIL/DTC
| • | The PCM turns OFF the malfunction indicator lamp (MIL) after
3 consecutive ignition cycles that the diagnostic runs and does not
fail. |
| • | A last test failed, or current DTC, clears when the diagnostic
runs and does not fail. |
| • | A history DTC clears after 40 consecutive warm-up cycles,
if no failures are reported by this or any other emission related diagnostic. |
| • | Use a scan tool in order to clear the MIL and the DTC. |
Diagnostic Aids
Important:
| • | Remove any debris from the PCM connector surfaces before servicing
the PCM. Inspect the PCM connector gaskets when diagnosing/replacing
the PCM. Ensure that the gaskets are installed correctly. The gaskets
prevent contaminate intrusion into the PCM. |
| • | For any test that requires probing the PCM or a component
harness connector, use the Connector Test Adapter Kit J 35616
. Using this kit prevents damage
to the harness/component terminals. Refer to
Using Connector Test Adapters
in Wiring Systems. |
| • | The following may cause an intermittent: |
| - | Rubbed through wire insulation |
| - | Broken wire inside the insulation |
| • | The PCM enables the Engine Coolant Over temperature mode when
coolant temperature exceeds 132°C (270°F). Engine damage still could
occur if the customer operates the vehicle too long in an overheat condition.
Ensure no engine mechanical conditions exists after the overheat condition
is repaired. |
| • | Using Freeze Frame and/or Failure Records data may aid in locating
an intermittent condition. If you cannot duplicate the DTC, the information
included in the Freeze Frame and/or Failure Records data can aid
in determining how many miles since the DTC set. The Fail Counter
and Pass Counter can also aid determining how many ignition cycles
the diagnostic reported a pass and/or a fail. Operate the vehicle
within the same freeze frame conditions (RPM, load, vehicle speed,
temperature etc.) that you observed. This will isolate when the DTC
failed. |
| • | For an intermittent condition, refer to
Symptoms
. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
A cooling system over heating condition will enable the engine protection
mode.
