Fuel Pump Relay Power Check
- Turn ignition on. Use voltmeter to measure voltage between ground and terminals "B" (Red) and "C" (Black/Yellow) or "A" (Yellow). See Figure . If voltage at each terminal is more than 10.5 volts, voltage supply is okay. Proceed to FUEL PUMP RELAY RESISTANCE CHECK . If voltage reading is 10.5 volts or less, proceed to steps 2 and 3.
- If voltage at terminal "B" (Red) is less than 10.5 volts, repair fuel pump relay-to-EEC power relay circuit. If the voltage at terminal "C" (Black/Yellow) is less than 10.5 volts, check 30-amp fuse in power distribution box. If fuse is okay, repair Black/Yellow wire between power distribution box and fuel pump relay.
- If the voltage at terminal "A" (Yellow) is less than 10.5 volts, check circuit between fuel pump relay and Batt (+). Repair as necessary. If circuit is okay, perform QUICK TEST in TESTS W/CODES article.