Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGEO1993PRIZM L4-1600CC 1.6L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMDISTRIBUTORTESTING AND INSPECTION
1993 Geo Prizm L4-1600cc 1.6L DOHC
Distributor: Testing and Inspection
1993 Geo Prizm L4-1600cc 1.6L DOHCSECTION Testing and Inspection
Measure
Tool Required:
J39200 Digital Multimeter
NOTICE: The term "cold" refers to temperature ranging from -10° C (14° F) to 50°C (104° F). The term "hot" refers to temperature ranging from 50° C (104° F) to 100° C (212° F).
1. The resistance of distributor connector C1 when cold, between terminals 3 and 6, using a J39200. If the camshaft position (CMP) sensor resistance is not between 185 and 275 ohms, replace the distributor housing.
2. The resistance of distributor connector C1 when cold, between terminals 2 and 5. using a J39200. If the CMP sensor resistance is not between 370 and 550 ohms. replace the distributor housing.
3. The resistance of distributor connector C1 when hot, between terminals 3 and 6, using a J39200. If the CMP sensor resistance is not between 240 and 325 ohms. replace the distributor housing.
4. The resistance of distributor connector C1 when hot, between terminals 2 and 5. using a J39200. If the CMP sensor resistance is nor between 475 and 650 ohms, replace the distributor housing.
5. Air gap between the signal rotor and camshaft position (CMP) sensor. If the air gap is not between 0.2 - 0.4 mm (0.008 - 0.016 inch), replace the distributor housing.
Tool Required:
J39200 Digital Multimeter
NOTICE: The term "cold" refers to temperature ranging from -10° C (14° F) to 50°C (104° F). The term "hot" refers to temperature ranging from 50° C (104° F) to 100° C (212° F).
Measuring Camshaft Position Sensor Resistance:
1. The resistance of distributor connector C1 when cold, between terminals 3 and 6, using a J39200. If the camshaft position (CMP) sensor resistance is not between 185 and 275 ohms, replace the distributor housing.
2. The resistance of distributor connector C1 when cold, between terminals 2 and 5. using a J39200. If the CMP sensor resistance is not between 370 and 550 ohms. replace the distributor housing.
3. The resistance of distributor connector C1 when hot, between terminals 3 and 6, using a J39200. If the CMP sensor resistance is not between 240 and 325 ohms. replace the distributor housing.
4. The resistance of distributor connector C1 when hot, between terminals 2 and 5. using a J39200. If the CMP sensor resistance is nor between 475 and 650 ohms, replace the distributor housing.
Measuring Air Gap:
5. Air gap between the signal rotor and camshaft position (CMP) sensor. If the air gap is not between 0.2 - 0.4 mm (0.008 - 0.016 inch), replace the distributor housing.
RENDER: 1.0x
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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.