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Home >> Toyota >> 1990 >> Pickup Base, 22-RE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - EFI >> Ignition System >> Spark Test

Spark Test

  1. On models with integral ignition coil, disconnect the spark plug wires. Remove spark plugs. Install spark plugs to each spark plug wire. Ground spark plugs securely. A spark plug tester may also be used. See Fig 1.
    Fig 1: High Output Spark Tester
    G118974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. On models with an 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 more 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. If resistance is not within specification, replace wires. See IGNITION HIGH-TENSION WIRE RESISTANCE SPECIFICATIONS  table. If wires are okay, go to next step.
  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 not present, check wiring between ignition switch, coil, and ignitor. If voltage is present, go to next step.
  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 TESTS . If resistance is within specification, go to next step. If pick-up coil resistance is not as specified, replace pick-up coil.
    NOTE: On some models, it is necessary to replace entire distributor assembly.
  8. Check air gap between reluctor and pick-up coil. See PICK-UP COIL AIR GAP CHECK . If air gap is incorrect, replace distributor assembly.
  9. If air gap is correct, check ignition "IGT" signal from ECU. See appropriate trouble code No. 14 chart in TESTS W/CODES article. If "IGT" signal is okay, replace ignitor.
CAUTION: A loss of either "IGT" or "IGF" signal will cause a no-start condition.
IGNITION HIGH-TENSION WIRE RESISTANCE SPECIFICATIONS

Application Ohms
Pickup/4Runner 25,000 Max. Per Wire
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