Test NTC-19A - Checking Fuel Heater
NOTE:
For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS
article in this section.
NOTE:
Test applies only if vehicle symptoms are: runs rich, hard to start, does not rev-up, or misses under load. If vehicle experiences these symptoms only when ambient temperature is 40°F (4.4°C) or more, this test does not apply.
- Disconnect fuel heater connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
- Turn ignition on. Using scan tool in voltmeter mode, check voltage on fuel heater connector, fuel heater relay output circuit (Red/Black wire). If voltage is 10 volts or less, repair open fuel heater relay output circuit and perform TEST VER-2A . If voltage is more than 10 volts, go to next step.
- Turn ignition off. Using scan tool in ohmmeter mode, check resistance of fuel heater connector, ground circuit (Black/Tan wire). If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
- Ensure fuel heater element temperature is less than 40°F (4.4°C). Using an external ohmmeter, check resistance across fuel heater connector terminals (component side). If resistance is not 2.4-3.1 ohms, replace fuel heater element and perform TEST VER-2A . If resistance is 2.4-3.1 ohms, fuel heater is operating normally. Test passed.