RAM 3500 Truck 2WD L6-6.7L DSL Turbo (2010)
Fuel Heater: Testing and Inspection
Fuel Heater Thermostat Test
FUEL HEATER THERMOSTAT TEST
FUEL HEATER THERMOSTAT TEST
1. To check the operating resistance levels on the thermostat and fuel heater perform the following:
2. Unplug the wiring harness from the thermostat.
3. Check the resistance across the two pins of the thermostat with an Ohmmeter.
4. The ambient temperature must be below the "Circuit close temperature; 1° +/- 3° C to perform this check.
5. If necessary, induce this ambient temperature by placing ice packs on the thermostat to produce an "effective ambient temperature" below the
circuit close temperature.
6. The resistance across the two pins should be within the range of 0.3 Ohms to 0.45 Ohms for a properly operating thermostat and heater.
7. If the resistance from step 2 is out of range, remove the thermostat and check the resistance across the terminal connections of the heater (the
heater can be checked at room temperature).
8. The resistance across the terminal pins of the heater should be within the same range of step 2.
9. Replace the heater if resistance is not within the proper operation range.
10. Replace the heater if resistance is not within the proper operation range. Re-install the thermostat with a new o-ring.
11. If the heater resistance is within the proper operating.
12. Circuit close temperature; 1° +/- 3° C
13. Circuit open temperature; 18° +/- 4° C
14. Fuel Heater Thermostat 0.3 - 0.45 of an Ohm at less than 1° C
15. Fuel Heater 0.3 - 0.45 of an Ohm at room temperature
View Repair
Repair
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Test complete.
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Perform the POWERTRAIN VERIFICATION TEST - 6.7L. See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble
Code Tests and Associated Procedures/Verification Tests/Powertrain Verification Test.
