1986 Mazda RX-7 Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Fuel Injectors: Notes

  1. Using a mechanic's stethoscope, listen to each injector for normal "clicking" operating noise at idle and under acceleration. To check secondary injectors, disconnect vacuum hose from boost sensor. Start engine and slowly increase speed. Using a mechanic's stethoscope, check that secondary injectors start clicking at 3500 RPM.
  2. If clicking noise is not heard, check the crank angle sensor resistance. Using an ohmmeter, check between the terminals on the crank angle sensor connector. Resistance should be 110-210 ohms between terminals "G1" and "G2" or terminals "Ne1" and "Ne2". See Fig 1 .
    CRANK ANGLE SENSOR RESISTANCE VALUES

    Terminal Resistance (Ohms)
    G1 (B) - G2 (G) 110-210
    Ne1 (W) - Ne2 (R) 110-210
    Fig 1: Testing Crank Angle Sensor
    G36020
  3. Check continuity of the wire from crank angle sensor to electronic control unit. If continuity is correct, check resistance of the solenoid resistor.
  4. Using an ohmmeter, check resistance between terminals "FP" and "B" of the solenoid resistor. See Fig 2 . Resistance should be 5-7 ohms. If not, replace solenoid resistor.
    SOLENOID RESISTOR RELAY RESISTANCE VALUES

    Application Ohms
    Solenoid Resistor 5-7
    Fig 2: Testing Solenoid Resistor
    G36019
  5. If solenoid resistor checks satisfactory, check EGI main fuse located forward of left strut tower. See Fig 3 . If okay, turn ignition on and ensure that main relay clicks each time key is turned on. Main relay is located behind left strut tower.
    Fig 3: View of Main EGI Fuse
    G36018
  6. If main relay does not click when key is turned on, check that battery voltage is present at main relay two pronged connector (Black/White) wire. See Fig 4 . If not, repair open in circuit.
    MAIN EGI RELAY RESISTANCE VALUES

    Operation/Terminals 12V Not Applied 12V Applied
    A-B No Continuity Continuity
    C-D No Continuity Continuity
    Fig 4: View of Main EGI Relay
    G36022
  7. If voltage is present at two pronged connector of the main relay, check continuity of main relay. Apply battery voltage and ground to the main relay side of the 2-pronged connector.
  8. Using an ohmmeter, check that there is no continuity between terminals "A" and "B" or "C" and "D" when no voltage is applied. Check that there is continuity between terminals "A" and "B" or "C" and "D" when voltage is applied. See Fig 4 . If continuity reading is incorrect, replace main relay.
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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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