LEMON Manuals: Even more car manuals for everyone
Home >> BMW >> 1989 >> 735i Standard >> Repair and Diagnosis >> Engine Performance >> System >> Tests W/Codes >> Trouble Code Diagnosis >> Malfunction Light Not On/No Start >> Fuel Pump Relay

Fuel Pump Relay

Ensure fuel pump fuse No. 23 is okay. Turn ignition switch to RUN position. Disconnect fuel pump relay (in control box at right or left shock tower). Perform voltage tests at relay connector as indicated in FUEL PUMP RELAY TESTS  table. Correct any problems found. If all voltages are as specified, go to MCU POWER & GROUND  test.

FUEL PUMP RELAY TESTS

Measure Between Correct Voltage If Voltage is Incorrect
No. 6 & Gnd. Battery (1) Battery
No. 8 & Gnd. Battery (1) Main Relay
No. 6 & No. 4 Battery (2) MCU No. 3
(1) Repair open in wire from indicated component.
(2) Repair open wire to indicated MCU terminal.
scientia non olet · About LEMON Manuals