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Home >> Toyota >> 1996 >> Supra 3.0 E >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - Turbo >> Ignition Checks (DISTRIBUTORLESS Ignition System) >> Spark Test
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Spark Test

  1. Disconnect negative battery cable. Remove oil filler cap. Remove timing belt cover and gasket, located above ignition coils on top of cylinder head. Remove PCV hoses. Disconnect engine wiring clamps on ignition coils.
  2. Disconnect electrical connectors from ignition coils. Remove bolts and ignition coils. Reconnect negative battery cable and electrical connectors on ignition coils.
  3. Remove spark plugs. Install spark plug on each ignition coil. Ground spark plug against cylinder block.
    CAUTION: To prevent gasoline from being injected, DO NOT crank engine for longer than 5 seconds.
  4. Crank engine and check for spark. If spark does not exist, check ignition coil and igniter electrical connections. If electrical connections are okay, go to next step. If electrical connections are defective, repair as necessary and recheck for spark.
  5. Turn ignition on. Check for battery voltage at igniter and ignition coil positive terminal. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between ignition switch, ignition coil and igniter. See appropriate wiring diagram in WIRING DIAGRAMS article.
  6. Check ignition coil resistance. See IGNITION COIL RESISTANCE  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.
  7. Check resistance of camshaft position sensors and crankshaft position sensor. See CAMSHAFT POSITION SENSOR  and CRANKSHAFT POSITION SENSOR  under IGNITION CHECKS (DISTRIBUTORLESS IGNITION SYSTEM).
  8. 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.
  9. Check ignition IGT signal from Engine Control Module (ECM). If ignition IGT signal from ECM is defective, a diagnostic trouble Code No. 14 will be set in the ECM memory to indicate a igniter circuit malfunction. See TESTS W/CODES article for diagnostic trouble code.
  10. If IGT signal is okay, substitute another igniter and recheck system operation. If IGT signal is defective, check wiring between Engine Control Module (ECM), distributor and igniter. If wiring is defective, repair wiring as necessary and recheck system operation. If wiring is okay, substitute another ECM and recheck system operation. Reinstall components.
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