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 MANUALSTOYOTA1994COROLLA DX, 4D WAGON, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGIGNITION CHECKSSPARK TEST
1994 Toyota Corolla DX, 4D Wagon, Automatic
Spark Test
1994 Toyota Corolla DX, 4D Wagon, AutomaticSECTION Spark Test
- Disconnect spark plug wires. Remove spark plugs. Install spark plug on each spark plug wire. Ground spark plug against cylinder block.CAUTION: To prevent gasoline from being injected, DO NOT crank engine for longer than 2 seconds.
- Crank engine and check for spark. If spark does not occur, check ignition coil, ignitor and distributor electrical connections.
- If electrical connections are okay, using ohmmeter, check resistance of high tension wires. Replace high tension wires if resistance is not within specification. See HIGH TENSION WIRE RESISTANCE table. If resistance is within specification, proceed to step 4).HIGH TENSION WIRE RESISTANCE
Application Maximum Ohms All Models 25,000 Per Wire - Check voltage at ignition coil and ignitor. Turn ignition on. Ensure voltage exists at ignition coil positive terminal. If voltage exists, proceed to step 5). If voltage does not exist, check wiring between ignition switch, ignition coil and ignitor. Refer to the WIRING DIAGRAMS article for wiring circuit.
- Check ignition coil resistance. See IGNITION COIL RESISTANCE under IGNITION CHECKS. Replace ignition coil if resistance is not within specification. If ignition coil resistance is within specification, proceed to step 6).
- Check pick-up coil resistance. See PICK-UP COIL RESISTANCE under IGNITION CHECKS. Replace pick-up coil or distributor assembly if pick-up coil resistance is not within specification. If pick-up coil resistance is within specification, proceed to step 7).
- Check pick-up coil air gap. See PICK-UP COIL AIR GAP under IGNITION CHECKS. If pick-up coil air gap is incorrect, replace distributor assembly. If pick-up coil air gap is correct, proceed to step 8).
- Check ignition IGT signal from ECM. If ignition IGT signal from ECM is defective a diagnostic trouble code will be set in the ECM memory to indicate a ignitor circuit malfunction. See information in the TESTS W/CODES article for diagnostic trouble code. If IGT signal is okay, replace ignitor.
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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.