Circuit Description
The fuel temperature sensor is a thermistor that controls signal voltage
to the PCM. When the fuel is cold, the sensor resistance is high, therefore
the PCM will see high signal voltage. As fuel warms, sensor resistance
becomes less and voltage drops. The fuel temperature sensor is integrated
with the optical sensor.
Conditions for Running the DTC
| • | The PCM performs this DTC diagnostic continuously. |
| • | The engine operation time is greater than 8 minutes. |
Conditions for Setting the DTC
| • | The fuel temperature is less than or equal to -40°C
(-40°F). |
| • | All of the diagnostic set conditions met for 2 seconds. |
Action Taken When the DTC Sets
| • | The PCM illuminates the malfunction indicator lamp (MIL) on the
second consecutive drive trip that the diagnostic runs and fails. |
| • | The PCM records the operating conditions at the time the diagnostic
fails. The first time the diagnostic fails, the Failure Records will store
this information. If the diagnostic reports a failure on the second
consecutive drive trip, the Freeze Frame records the operating conditions
at the time of failure and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The PCM will turn the MIL off after three consecutive trips without
a fault condition. |
| • | A History DTC clears after forty consecutive warm-up cycles,
if this or any other emission related diangostic does not report any failures. |
Diagnostic Aids
Important: Remove any debris from the PCM module connector surfaces before servicing
the PCM module. Inspect the PCM module connector gaskets when diagnosing/replacing
the module. Ensure the gaskets are installed correctly.
A scan tool reads fuel temperature in degrees centigrade.
An intermittent may be caused by the following conditions:
| • | Rubbed through wire insulaton |
| • | Broken wire inside the insulation |
