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Home >> Mercedes Benz >> 1984 >> 190E Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - BOSCH Cis-E >> Testing >> Electrical Component Test >> Fuel Pump Relay

Fuel Pump Relay

  1. Using volt/ohmmeter, connect positive lead to terminal 30, and negative lead to terminal 3 of connector plug and measure voltage. If reading is 0 volts, go to step 2).
  2. Remove negative lead of volt/ohmmeter from terminal 3 and connect to vehicle ground. If reading is approx. 12 volts, check terminal 31 for short. If voltage is 0, check for short at terminal 30.
  3. Switch on ignition, measure voltage at terminal 15 of connector. If reading is 0 volts, check terminal 15 for short. If reading is 12 volts, go to step 4).
  4. Using dwell meter, connect leads to terminal 10. Actuate starter, dwell should be 7-34°. If reading is off, check cable from terminal 10 (Green/Yellow) to TSU for short. If cable is good, replace switching unit. If dwell reading is good, go to step 5).
  5. Bridge terminal 87 and 30. If fuel pump is running, end of test. If fuel pump is not running, go to step 6).
  6. Check cable from terminal 87 (Black/Red and White) to fuel pump for shorts. If cable is good, replace fuel pump relay. If fuel pump is not running, replace fuel pump.
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