Circuit Description
The fuel manager/filter assembly mounted to the engine consists of the fuel heater and the secondary fuel filter.
The fuel passes through the fuel heater assembly to the secondary fuel filter. The fuel heater assembly contains ceramic heater and a thermostatic switch that opens or closes to turn the heater OFF or ON. The thermostatic switch completes the ground circuit for the fuel heater when fuel temperature is below 15.4°C (59.8°F).
The fuel then passes through the fuel filter and to the fuel injection pump.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematic Icons | ||||
1 | Did you perform the Diagnostic System Check - Engine Controls? | -- | Go to Step 2 | |
2 |
Does heat occur? | -- | Go to Step 4 | Go to Step 3 |
3 |
Does the thermostatic switch turn ON when the temperature is within the specified range? | -8.4 to +15.4°C (16.9-59.8°F) | Go to Step 5 | Go to Step 4 |
4 | Replace the fuel heater. Refer to Fuel Filter Assembly Replacement . Did you complete the replacement? | -- | Go to Step 5 | -- |
5 |
Does the fuel heater operate properly? | -- | Go to Step 6 | Go to Step 1 |
6 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | System OK | |
