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 MANAGEMENTEMISSION CONTROL SYSTEMSEXHAUST GAS RECIRCULATIONEGR CONTROL SOLENOIDTESTING AND INSPECTION
1993 Geo Prizm L4-1600cc 1.6L DOHC
EGR Control Solenoid: Testing and Inspection
1993 Geo Prizm L4-1600cc 1.6L DOHCSECTION Testing and Inspection
EGR Solenoid Vacuum (SV) Valve (California Emissions Only)
Tools Required:
J39200 Digital Multimeter
J36169 Fuse Jumper Wire
1. Remove EGR SV valve from vehicle. Refer to "Exhaust Gas Recirculation Solenoid Vacuum (EGR SV) Valve Replacement" in this section.
Measure
^ Using a J39200, measure resistance between EGR SV valve terminals. Resistance when cold should be 37 - 44 ohms. Replace as necessary.
^ Using a J39200, check for continuity between each terminal and the body of the EGR SV valve. Replace the EGR SV valve if continuity is detected.
2. Blow air through port "E" of the valve and make sure that air flows from port "E" through the valve and out of the filter. Replace EGR SV valve if air does not pass through valve.
3. Using two J36169 fused jumpers, apply battery voltage across the terminals of the EGR SV Valve and blow air through port "E" making sure that air does NOT pass through valve and out of the filter. Replace EGR SV valve if air passes through valve.
4. Reinstall EGR SV valve. Refer to "Exhaust Gas Recirculation Solenoid Vacuum (EGR SV) Valve Replacement" in this section.
Tools Required:
J39200 Digital Multimeter
J36169 Fuse Jumper Wire
1. Remove EGR SV valve from vehicle. Refer to "Exhaust Gas Recirculation Solenoid Vacuum (EGR SV) Valve Replacement" in this section.
Measure
Measuring EGR SV Valve Resistance:
^ Using a J39200, measure resistance between EGR SV valve terminals. Resistance when cold should be 37 - 44 ohms. Replace as necessary.
Checking For A Shorted SV Valve:
^ Using a J39200, check for continuity between each terminal and the body of the EGR SV valve. Replace the EGR SV valve if continuity is detected.
Checking EGR SV Air Flow:
2. Blow air through port "E" of the valve and make sure that air flows from port "E" through the valve and out of the filter. Replace EGR SV valve if air does not pass through valve.
Checking EGR SV Valve Air Flow:
3. Using two J36169 fused jumpers, apply battery voltage across the terminals of the EGR SV Valve and blow air through port "E" making sure that air does NOT pass through valve and out of the filter. Replace EGR SV valve if air passes through valve.
4. Reinstall EGR SV valve. Refer to "Exhaust Gas Recirculation Solenoid Vacuum (EGR SV) Valve Replacement" in this section.
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.