1991 Toyota Corolla Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Spark Test

  1. On models with integral ignition coil, disconnect spark plug wires. Remove spark plugs. Install spark plugs to each spark plug wire. Ground spark plug.
  2. On models with external ignition coil, disconnect high tension (coil) wire from distributor. Hold wire about 1/2" away from ground.
    CAUTION: To prevent gasoline from being injected, DO NOT  crank engine for longer than 2 seconds.
  3. On all models, crank engine and check for spark. If spark does not occur, check ignition coil, ignitor and distributor connections.
  4. If connections are good, check resistance of high tension wires. See IGNITION HIGH-TENSION WIRE RESISTANCE  table. If resistance is within specification, go to next step. If resistance is not within specification, replace wires.
  5. Check power supply to ignition coil and ignitor. Place ignition switch in ON position. Check for voltage at ignition coil positive terminal. If voltage is present, go to next step. If voltage is not present, check wiring between ignition switch, coil and ignitor.
  6. Check ignition coil resistance. See IGNITION COIL RESISTANCE TESTS . If ignition coil resistance is not as specified, replace coil. If coil resistance is within specification, go to next step.
  7. Check pick-up coil resistance. See PICK-UP COIL RESISTANCE TEST . If resistance is within specification, go to next step. If pick-up coil resistance is not as specified, replace pick-up coil or distributor assembly.
  8. Check air gap between reluctor and pick-up coil. See PICK-UP COIL AIR GAP CHECK . If air gap is correct, go to next step. If air gap is incorrect, replace distributor assembly.
  9. Check ignition IGT signal from ECU. See appropriate CODE 14 chart in TESTS W/CODES article in this section. If IGT signal is okay, replace ignitor.
NOTE: A loss of either IGT or IGF signal will cause a no-start condition.
IGNITION HIGH-TENSION WIRE RESISTANCE

Application Ohms
All Models 25,000 Maximum Per Wire
Factory Service Tools

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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.

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