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Camshaft Position Sensor (PRIZM)

  1. Ensure ignition is off. Remove rotor from distributor housing. Remove coil dust cover and gasket from distributor housing. Remove 2 nuts and 4 wires from ignition coil terminals. Remove 4 screws and 3 wires from ignitor terminals. Remove 2 screws and ignitor from distributor housing.
  2. Remove 2 connectors from harness retainer. Remove distributor wire from housing. Remove screw and noise suppressor condenser from housing.
  3. Measure resistance of distributor connector C1, when cold(14-104°F; -10-50°C), between terminals No. 3 and 6. See Fig 1 . Replace distributor housing if resistance of Camshaft Position (CMP) Sensor is not 185-275 ohms.
    Fig 1: Checking Camshaft Position Sensor (Prizm)
    G93B78312Courtesy of GENERAL MOTORS CORP.
  4. Measure resistance of connector C1, when cold, between terminals No. 2 and 5. If resistance of CMP sensor is not 370-550 ohms, replace distributor housing.
  5. Measure resistance of connector C1, when hot(104-212°F; 50-100°C), between terminals No. 3 and 6. If resistance of CMP sensor is not 240-325 ohms, replace distributor housing.
  6. Measure resistance of connector C1, when hot, between terminals No. 2 and 5. If resistance of CMP sensor is not 475-650 ohms, replace distributor housing.
  7. Measure air gap between signal rotor and camshaft position sensor. If air gap is not .008-.016" (.20-.40 mm), replace distributor housing. When testing is complete, reverse disassembly procedure.
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