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3 DETECT MALFUNCTIONING PART Check the following. + 10A fuse + 15A fuse + Harness for open or short between fuse and fuel pump relay © Repair harness or connectors. 4 CHECK POWER GROUND CIRCUIT 1. Turn ignition switch “OFF”. SEF632Z 3. Check harness continuity between fuel level sensor unit and fuel pump harness connector terminal 3 and body ground, terminal 5 and fuel pump relay connector terminal 3. Continuity should exist. 4. Also check harness for short to ground and short to power. OK or NG OK © GO TO 6. NG © GO TO 5. 5 DETECT MALFUNCTIONING PART Check the following. + Harness for open or short between fuel pump and body ground + Harness for open or short between fuel pump and fuel pump relay © Repair open circuit or short to ground or short to power in harness or connectors. 6 CHECK OUTPUT SIGNAL CIRCUIT 1. Disconnect ECM harness connector. Refer to wiring diagram. Continuity should exist. 3. Also check harness for short to ground and short to power. OK or NG OK © GO TO 8. NG © GO TO 7. FUEL PUMP QG18DE Diagnostic Procedure (Cont’d) EC-521 |