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Home >> Toyota >> 2000 >> 4Runner Base, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures - 4-Cylinder >> Ignition Systems >> Spark Test >> Tacoma 2.4L 4-Cyl. Calif. Emission Vehicles, Tacoma 2.7L 4-Cyl. Calif. Emission Vehicles & 4Runner 2.7L 4-Cyl. Calif. Emission Vehicles)

Tacoma 2.4L 4-Cyl. Calif. Emission Vehicles, Tacoma 2.7L 4-Cyl. Calif. Emission Vehicles & 4Runner 2.7L 4-Cyl. Calif. Emission Vehicles)

  1. Disconnect electrical connectors at ignition coils mounted on top of valve cover. Remove bolts and ignition coils from valve cover. Remove spark plugs. Install spark plug on each ignition coil. Reinstall electrical connectors on ignition coils. Ground spark plugs against cylinder block.
    CAUTION: To prevent gasoline from being injected, DO NOT crank engine for longer than 2 seconds when checking for spark.
  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. Install different ignition coil on spark plug and recheck for spark. If spark still does not exist, go to next step. If spark now exists with different ignition coil, replace original ignition coil.
  4. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal. See appropriate wiring diagram in WIRING DIAGRAMS article. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between ignition switch and ignition coil.
  5. Check resistance of camshaft position sensor. See CAMSHAFT POSITION SENSOR RESISTANCE . If camshaft position sensor resistance is within specification, go to next step. If camshaft position sensor resistance is not within specification, replace camshaft position sensor. See IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article.
  6. Check resistance of crankshaft position sensor. See CRANKSHAFT POSITION SENSOR RESISTANCE . If crankshaft position sensor resistance is within specification, go to next step. If crankshaft position sensor resistance is not within specification, replace crankshaft position sensor. See IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article.
  7. Check ignition IGT signal from Engine Control Module (ECM) to ignition coil. If ignition IGT signal from ECM is defective, Diagnostic Trouble Code (DTC) P1300, P1305, P1310 or P1315 will be set in ECM memory to indicate an ignitor circuit malfunction. See SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article for retrieving of DTCs.
  8. If ignition IGT signal is okay, substitute another ignition coil and recheck system operation. If ignition IGT signal is defective, check wiring between ECM and ignition coil. See ECM LOCATION  table. 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. Tighten spark plugs to 15 ft. lbs. (20 N.m).
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