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 MANUALSSATURN1993SC L4-1.9L SOHC VIN 9REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMRELAYS AND MODULES - IGNITION SYSTEMIGNITION CONTROL MODULETESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSDIS MODULE SPARK QUICK TEST
1993 Saturn SC L4-1.9L SOHC VIN 9
DIS Module Spark Quick Test
1993 Saturn SC L4-1.9L SOHC VIN 9SECTION DIS Module Spark Quick Test
DIAGNOSTIC AIDS
^ DIS module spark quick test:
^ Remove all four plug wires at the coil towers.
^ Have an assistant crank the engine. You should see sparks appear alternately between each pair of coil towers during cranking.
^ The DIS module, crankshaft position sensor and the coil packs are good if sparks appear between the coil towers.
CAUTION: The DIS system can produce extremely high voltages. Do not attempt to service this system while the engine is running or is being cranked.
^ The measured resistance from tower to tower on the coils should be 7-10k Ohms.
^ The measured resistance of the crankshaft position sensor should be 700-900 Ohms.
^ To test for spark at spark plug wires use a spark test tool ST-125, or equivalent.
^ Engine firing order is 1-3-4-2.
^ Reversed CPS wires will result in a no start condition.
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.