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Home >> Mazda >> 1991 >> RX-7 Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Engine Controls - Basic Testing) >> Fuel Pressure (Electrical) >> Notes
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Fuel Pressure (Electrical): Notes

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1990 Mazda RX-7, 1990 Mazda Protege, 1990 Mazda MX-6, 1990 Mazda MX-5 Miata, and 1990 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition on. Locate fuel control unit under left side of dash. Using a jumper wire, connect terminals "B" to "D". Fuel pump (located in tank) should operate. If not, check and replace fuel pump, if necessary. Check fuel pump pressure. SeeFUEL PUMP PERFORMANCE  table.
    NOTE: Fuel pump control unit terminal identification is not available.
  2. If fuel pump operates, remove jumper wire. With ignition on, backprobe rear of fuel pump control unit. There should be 12 volts on terminals "A" and "D" only. If not, check ignition and power feed.
  3. Allow engine to idle. There should be 12 volts on terminals "A", "B", "D" and "F" only. If voltage is missing on terminal "B" only, replace fuel pump control unit. If any other terminal did not test as described, check ignition coil (tachometer signal) and power feed.
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