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Home >> Geo >> 1995 >> Prizm Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - 1.6L >> Computerized Engine Controls >> Engine Sensors & Switches >> Camshaft Position Sensor
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Camshaft Position Sensor

  1. Ensure ignition is off. Remove rotor from distributor housing. Remove ignition coil dust cover and gasket from distributor housing. Remove 2 nuts and 4 wires from ignition coil terminals.
  2. Remove 3 screws and 3 wires from igniter terminals. Remove 2 screws and igniter from distributor housing. Remove 2 connectors from harness retainer. Remove distributor wire from housing. Remove screw and noise suppressor condenser from housing.
  3. Using ohmmeter, measure resistance of Camshaft Position (CMP) sensor at specified distributor connector C1 terminals. See CMP SENSOR RESISTANCE  table. See Fig 1 . If resistance is not as specified, replace distributor housing.
  4. Measure air gap between signal rotor and camshaft position sensor. Air gap should be .008-.016" (.2-.4 mm). If air gap is not as specified, replace distributor housing. When testing is complete, reverse disassembly procedure.
CMP SENSOR RESISTANCE

Between Terminals No. (1) Ohms When COLD (1) Ohms When HOT
3 & 6 185-275 240-325
2 & 5 270-550 475-650
(1) COLD is 14-104°F (-10-40°C) and HOT is 104-212°F 40-100°C).
Fig 1: Checking Camshaft Position Sensor (1.6L Prizm)
G93B78312Courtesy of GENERAL MOTORS CORP.
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