Test NTC-5A - Checking Fuel Heater

WARNING: This page is about a different car, the 1995 Dodge Pickup and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagrams, see WIRING DIAGRAMS section at the end of this article.

NOTE: Test applies only if vehicle symptom is runs rich, hard to start, does not rev-up, or misses under load.

Turn ignition on. Disconnect fuel heater connector. Using scan tool in voltmeter mode, check voltage on fuel heater connector 12-volt feed circuit (Red/Black wire). If voltage is 7 volts or less, repair open Red/Black wire. Perform TEST VER-1. If voltage is more than 7 volts, use scan tool in ohmmeter mode to check resistance on fuel heater connector ground circuit (Black/Tan wire).
If resistance is 5 ohms or more, repair open Black/Tan wire. Perform TEST VER-1. If resistance is less than 5 ohms, check resistance across fuel heater terminals using an external ohmmeter. If resistance is not 2.4-3.1 ohms, replace fuel heater. Perform TEST VER-1. If resistance is 2.4-3.1 ohms, fuel heater is operating normally. Test is complete.