Fuel Pump Relay Test
- PCM supplies power to relay as long as PCM receives ignition reference signals or starter crank signal. To run fuel pump without starting engine, remove relay and jumper terminals No. 2 and 4.
- To test relay, use jumper wires to ground terminal No. 3 of relay and apply battery voltage to terminal No. 1 of relay. Using ohmmeter, check for continuity between relay terminals No. 2 and 4. If continuity does not exist, replace relay.