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Home >> Ford >> 1991 >> Bronco 4.9 Y, Standard, M5OD-R2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> TFI-IV System Ignition >> Pip Sensor/Stator Test (Closed Bowl Distributor)
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Pip Sensor/Stator Test (Closed Bowl Distributor)

  1. With ignition off, ensure distributor is connected to vehicle harness. Disconnect vehicle harness connector at TFI module. Connect DVOM positive (+) lead to terminal No. 6 at TFI vehicle harness connector. Connect negative (-) lead to ground.
  2. Crank engine and measure DC voltage. Voltage should vary between 4 and 6 volts. If voltage varies, test SPOUT circuit. If voltage does not vary go to next step.
  3. With ignition off, disconnect distributor connector. Using DVOM, measure resistance between terminals No. 1 and No. 5 at distributor connector. If resistance is 200 ohms or more, replace faulty PIP sensor.
  4. Disconnect vehicle harness connector at TFI module. Measure resistance between terminal No. 6 (PIP) at TFI module vehicle harness connector and terminal No. 5 (PIP to TFI Module) at distributor vehicle harness connector. If resistance is 5 ohms or more, repair open in circuit and retest. Check circuit for short to ground. Test circuit for short to power with KOEO. Service or replace wiring as necessary.
  5. Disconnect ECA connector and measure resistance between terminal No. 56 (PIP) at ECA 60-pin connector and terminal No. 5 (PIP to ECA Module) at distributor vehicle harness connector. If resistance is 5 ohms or more, repair open in circuit and retest. Check circuit for short to ground. Test circuit for short to power with KOEO. Service or replace wiring as necessary.
  6. Measure resistance between distributor connector terminal No. 2 (PIP SIG GND) and ground. Measure resistance between IGN GND, distributor connector terminal No. 6 (terminal No. 3 on 3.0L Aerostar or Ranger) and ground. If resistance is less than one ohm in both cases, ground circuit is okay. If resistance is one ohm or more in both cases, check PIP sensor mounting screws in distributor base for corrosion and tightness.
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