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Spark Test: Tacoma

  1. Disconnect spark plug wires from spark plugs. Remove spark plugs and install spark plug on each spark plug wire. Ground spark plug against cylinder block.
    2. CAUTION: To prevent gasoline from being injected, DO NOT crank engine for longer than 5 seconds when checking for spark.
  2. Crank engine and check for spark. Spark test is based on assumption that spark plugs are okay. If spark does not exist, check ignition coil and ignitor electrical connections. Ignitor is located at passenger's side front corner of engine compartment, near airflow meter and air cleaner assembly. 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 and recheck for spark.
  4. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal (Black/Red wire) and ignitor positive terminal (Black/Red wire). If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between ignition switch, ignition coil and ignitor. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  5. Check ignition coil resistance. See IGNITION COIL RESISTANCE . If ignition coil resistance is within specification, go to next step. If ignition coil resistance is not within specification, replace ignition coil. See IGNITION COIL under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
  6. Check resistance of camshaft position sensor. See CAMSHAFT POSITION SENSOR . 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 CAMSHAFT POSITION SENSOR under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
  7. Check resistance of crankshaft position sensor. See CRANKSHAFT POSITION SENSOR . 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 CRANKSHAFT POSITION SENSOR under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
  8. Check ignition IGT signal from Engine Control Module (ECM) to ignitor. If ignition IGT signal from ECM is defective, Diagnostic Trouble Code (DTC) P0300, P0301, P0302, P0303, P0304, P0305 and P0306 will be set in ECM memory to indicate an ignitor circuit malfunction. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
  9. If ignition IGT signal is okay, substitute another ignitor and recheck system operation. If ignition IGT signal is defective, check wiring between ECM and ignitor. See ENGINE CONTROL MODULE LOCATION  table. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. 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 13 ft. lbs. (18 N.m). Tighten ignition coils to 69 INCH lbs. (7.8 N.m).
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