Chart A-5 - Fuel Pump Relay Circuit: Notes
WARNING: This page is about a different car, the 1995 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.
When ignition switch is turned to ON position, ECM activates fuel pump relay to run fuel pump. ECM activates relay as long as it receives ignition reference signals or starter crank signal. If no reference signals are received by ECM within 2 seconds after ignition is turned on, ECM cuts off power to relay.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- This test checks for battery voltage at switching portion of fuel pump relay.
- This determines if circuit between fuel pump relay (including fuel pump) and ground are okay.
- This test will check relay circuit for availability of voltage to relay coil.