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Home >> Toyota >> 1997 >> 4Runner Base, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - 2.7L >> Ignition Checks (DISTRIBUTORLESS Ignition System) >> Spark Test
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Spark Test

  1. 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.
  2. Crank engine and check for spark. If spark does not exist, check ignition coil electrical connections. If electrical connections are okay, go to next step. If electrical connections are defective, repair as necessary and recheck for spark.
  3. Using ohmmeter, check resistance of spark plug wire. Replace spark plug wire if resistance exceeds 25,000 ohms per wire. If resistance is within specification, go to next step.
  4. Turn ignition on. Check for battery voltage at ignition coil positive terminal. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between ignition switch and ignition coil. See appropriate wiring diagram in WIRING DIAGRAMS - 2.7L article.
  5. Check ignition coil resistance. See IGNITION COIL RESISTANCE (DISTRIBUTORLESS IGNITION SYSTEM)  under IGNITION CHECKS (DISTRIBUTORLESS IGNITION SYSTEM). Replace ignition coil if resistance is not within specification. If ignition coil resistance is within specification, go to next step.
  6. Check resistance of camshaft position sensor and crankshaft position sensor. See CAMSHAFT POSITION SENSOR  and CRANKSHAFT POSITION SENSOR  under IGNITION CHECKS (DISTRIBUTORLESS IGNITION SYSTEM).
  7. Replace camshaft position sensor or crankshaft position sensor if resistance is not within specification. If camshaft position sensor and crankshaft position sensor resistances are within specification, go to next step.
  8. Check ignition IGT signal from Engine Control Module (ECM). If ignition IGT signal from ECM is defective, a diagnostic trouble code P1300 or P1310 will be set in the ECM memory to indicate a ignitor circuit malfunction. See TESTS W/CODES - 2.7L article for diagnostic trouble code.
  9. If IGT signal is okay, substitute another ignition coil and recheck system operation. If IGT signal is defective, check wiring between Engine Control Module (ECM) and ignition coil. See ECM LOCATION (DISTRIBUTORLESS IGNITION SYSTEM) . If wiring is defective, repair wiring as necessary and recheck system operation. If wiring is okay, substitute another ECM and recheck system operation. Reinstall spark plugs.
ECM LOCATION (DISTRIBUTORLESS IGNITION SYSTEM)

Application Location
2.7L Behind Glove Box
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