Fault code information
2 trip MIL
3 drive cycle recovery
Readiness group – None
Freeze frame type – Fuel
Description of component(s)
The fuel temperature is measured in the low-pressure fuel supply gallery between the common rail pump units.
Effect on the system:
* Preventing automatic fuel module water draining activation when the fuel temperature is very low (the water present may be frozen).
* Limitation of the engine torque when the fuel temperature is too high.
Location of component(s)
Diagnostic condition
This diagnostic runs:
* When the ignition has been keyed off continuously for at least 8 hours;
* Difference between the coolant temperature and ambient temperature is less than 15°C [59°F]
* Ambient temperature is more than -20°C [-4°F]
Set condition of fault code
The PCI ECU (D420) detects that the measured fuel temperature sensor reading differs by more than 3°C [37°F] from the average of other temperature sensor readings on the engine for more than 5 seconds (after the ignition has been keyed off for at least 8 hours).
Reset condition of fault code
The 8-hour ignition off diagnostics consists of three separate steps:
* The vehicle ignition may NOT be switched on or engine started for 8-10 consecutive hours (ideal situation would be overnight).
* Once the 8 to 10 consecutive hours have been reached, key on the ignition (NO engine start) and wait for 10 seconds to allow the system to power up and the diagnostics to run.
* Start the engine and let it idle for 2 minutes.
* This DTC changes to inactive when the fault is no longer detected.
Electrical diagram(s)
Technical data
.
Possible causes
Fuel temperature sensor deviation
Additional information
For this diagnostic, the fuel temperature sensor (F803) reading is compared with an average of other temperature sensors on the engine after the ignition has been switched off for at least 8 hours.
