Inspection Procedure 24 - Fuel Pump System Operation

NOTE: For wiring diagram, see the WIRING DIAGRAMS article.

NOTE: Possible causes are: defective fuel pump relay, defective fuel pump, loose connector, open or shorted fuel pump wiring circuit or defective ECM.

Using scan tool, actuate fuel pump. Fuel pump is located in fuel tank. If fuel pump operates, go to step 4). If fuel pump does not operate, go to next step.
Ensure ignition is off. Apply battery voltage to fuel pump check terminal. Fuel pump check terminal is a 1-pin Black connector located on firewall, near battery and contains a Black/Blue wire. See Fig 1 .

Fig 1: Ignition Timing Adjustment Connector & Fuel Pump Check Terminal
If fuel pump operates, go to step 4). If fuel pump does not operate, check fuel pump circuit. Perform INSPECTION PROCEDURE 41.
Check fuel pump relay. See the SYSTEM/COMPONENT TESTS article. If fuel pump relay is okay, go to next step. Replace fuel pump relay if defective and recheck operation.
Note location of fuel pump relay on passenger's side of center console, just in front of emergency brake lever. See Figure . Using voltmeter, check voltage between ground and terminal No. 1 (Black/Blue wire) at fuel pump relay connector while using scan tool to actuate fuel pump. Battery voltage should exist.
If battery voltage exists, check wiring harness between fuel pump relay and fuel pump check terminal. Repair wiring harness if defective. If battery voltage does not exist, check fuel pump drive control circuit. Perform INSPECTION PROCEDURE 42.