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Fuel Pump Circuit Check: Aerio

  1. Turn ignition on. If fuel pump is heard for 2 seconds, circuit is in good condition. If fuel pump is not heard, go to next step.
  2. Turn ignition off. Remove fuel pump relay from underhood fuse/relay box. See Figure . Check for poor, loose, corroded or damage to main relay socket connections. If problem is found, repair as necessary. If no problem is found, go to next step.
  3. With ignition switch turned ON, measure voltage between engine ground and Black/Red wire terminals. If voltage is 10-14 volts, to next step. If voltage is not within specification, check ECM power and ground. If in good condition, Black/Red wire open or shorted to ground.
  4. Check fuel pump relay. Refer to FUEL PUMP RELAY & MAIN RELAY (AERIO)  . If relay is in good condition, go to next step. If not, replace relay.
  5. With ignition switch turned OFF, disconnect connectors between floor harness and instrument harness. Connect fuel pump relay to relay/fuse box. Check for proper connection of Grey/Blue wire terminal at engine harness and Brown/Yellow wire terminal at instrument harness. If wire terminals are OK, measure voltage between connector G04 terminal No. 12 and vehicle body ground 3 seconds after ignition switch is turned ON. See Figure . If voltage is 10-14 volts, go to next step. If voltage is not as specified, Brown/Yellow or Grey/Blue wire is open or shorted to ground.
  6. Using same conditions as previous step, turn ignition switch ON and measure voltage within 3 seconds. If voltage is 0-1 volt, go to next step. If voltage is not as specified, substitute known-good ECM and recheck.
  7. With ignition switch turned OFF, connect connectors between floor harness and instrument harness. Remove fuel tank and disconnect connector from fuel pump. Check resistance between Pink wire terminal and vehicle body ground. If resistance is infinity, go to next step. If resistance is not as specified, Pink wire is shorted to ground.
  8. With ignition turned OFF, connect fused jumper wire between connector G04 terminal No. 12 and vehicle body ground. Turn ignition switch ON and measure voltage between Pink terminal at fuel pump connector and vehicle body ground. If voltage is 10-14 volts, go to next step. If voltage is not as specified, Pink wire is open.
  9. Check for continuity between Black terminal at fuel pump and vehicle body ground with ignition switch OFF. If there is continuity, fuel pump is faulty. If there is no continuity, Black wire is open.
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