1992 Ford Probe LX, StandardFACTORY OEM SERVICE PROCEDURE

Fuel System Circuitry Check

  1. Turn ignition on. Connect Green and Black wires of fuel pump test connector terminals together. Measure voltage at fuel pump (Black/Pink wire on 1.8L, or White/Yellow wire on 2.2L). If voltage is 10-14 volts, go step 9). If voltage is not 10-14 volts, measure voltage at specified terminal of fuel pump relay connector. See Fig 2 . See FUEL PUMP RELAY SPECIFICATIONS  . See Fig 4 for terminal identification. Repair circuit if voltage is not as specified.
    FUEL PUMP RELAY SPECIFICATIONS

    Terminal Ignition Position Voltage
    1.8L
    White/Red ON 10-14
    Purple START 10-14
    2.2L (MTX)
    Black/White ON 10-14
    Black/Red START 10-14
    2.2L (ATX)
    Black/White ON 10-14
    Black/Pink START 10-14
  2. If voltage is as specified, turn ignition off and remove fuel pump relay. Connect terminal "B" to battery voltage and terminal "A" to ground. See Figure . Check voltage at terminal "C" as follows.
    • With terminals "D" and "E" open, voltage at terminal "C" should be less than one volt.
    • With terminal "D" grounded and terminal "E" open, voltage at terminal "C" should be greater than 10 volts.
    • With terminal "D" open and terminal "E" grounded, voltage at terminal "C" should be less than 10 volts.
    • With terminals "D" and "E" grounded, voltage at terminal "C" should be greater than 10 volts.
  3. If voltage is not as specified, replace fuel pump relay. If voltage is as specified, measure resistance between relay box Black terminal and ground (Probe), or between fuel pump relay connector Black wire and ground (Escort and Tracer). See Fig 3 to locate Black terminal of fuel pump relay box on Probe.
    NOTE: On 2.2L turbo models, ECA wiring harness connector must be disconnected for step 4).
  4. If resistance is greater than 5 ohms, repair circuit. If resistance is less than 5 ohms, access Vane Airflow (VAF) meter door. On Probe, measure resistance between Light Green terminal of relay box and ground. On all other models, measure resistance between Light Green wire of fuel pump relay connector and ground.
  5. With VAF door closed, resistance should be greater than 10,000 ohms. With VAF door open, resistance should be less than 4 ohms. If resistance is not as specified, go to next step. If resistance is as specified, go to step 7) (on turbo models), or go to step 8) (on non-turbo models).
    Fig 1: Locating Fuel Pump Relay (1.8L)
    G91H08170Courtesy of FORD MOTOR CO.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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