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Spark Test: Highlander

  1. Check for any Diagnostic Trouble Codes (DTC). See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs. If no DTCs exist, go to next step. If any DTCs exist, perform service procedure for DTC.
  2. Remove No. 2 cylinder head cover located on top of engine, above ignition coils and valve cover. Disconnect electrical connectors at ignition coils located on top of valve cover. Remove retaining bolts and ignition coils from valve cover. Remove spark plugs. Install spark plug on each ignition coil. Reinstall electrical connectors on ignition coils.
    3. CAUTION: To prevent gasoline from being injected, electrical connectors should be disconnected from fuel injectors. DO NOT crank engine for longer than 2 seconds when checking for spark.
  3. Disconnect electrical connectors at fuel injectors. Ground spark plugs against cylinder block. Crank engine and check for spark. If spark exists only at some spark plugs and not at other spark plugs, go to next step. If spark does not exist at any spark plug, go to step  5. If spark exists at all spark plugs, reinstall components. Tighten spark plugs to 14 ft. lbs. (19 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).
  4. Install substitute spark plug for spark plug which did not fire and recheck for spark. If spark now exists, replace original spark plug. If spark still does not exist, replace ignition coil. Reinstall components. Tighten spark plugs to 14 ft. lbs. (19 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).
  5. Install substitute spark plugs and recheck for spark. If spark now exists, replace original spark plugs. If spark still does not exist, replace ignition coil that does not produce spark. Reinstall components. Tighten spark plugs to 14 ft. lbs. (19 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).
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