1995 Geo Prizm Base, AutomaticFACTORY OEM SERVICE PROCEDURE

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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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.