Fuel Pump Relay (Impulse Non-Turbo & Stylus)

1. ECM powers relay as long as ECM receives ignition reference signals or starter crank signal. For fuel pump relay location.
2. To run fuel pump without starting engine, remove relay and jumper terminals No. 2 and 4.
3. To test relay, use jumper wires to ground terminal No. 4 of relay and apply battery voltage to terminal No. 2 of relay. Using ohmmeter, check for continuity between relay terminals No. 1 and 3. If continuity is not present, replace relay. See Fig 1 .

Fig 1: Fuel Pump Relay Schematic (Non-Turbo & Stylus)

Courtesy of ISUZU MOTOR CO.