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Spark Test: Avalon

  1. Remove ignition coils. See IGNITION COIL under IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article.
  2. Remove spark plugs. Install spark plug on each ignition coil. Reinstall electrical connectors on ignition coils.
    3. CAUTION: To prevent gasoline from being injected, DO NOT crank engine for longer than 5 seconds when checking for spark.
  3. Ground spark plugs against cylinder block. Crank engine and check for spark. Spark test is based on the assumption that spark plugs are okay. If spark does not exist, go to next step. If spark exist, reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m).
  4. 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.
  5. 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. Reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m).
  6. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal (Black/White wire). If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between IG2 relay and ignition coil. See WIRING DIAGRAMS article. IG2 fuse supplies constant battery voltage to one side of IG2 relay. When ignition is turned on, voltage is supplied from ignition switch to other side of IG2 relay and IG2 relay is then energized. When IG2 relay is energized, IG2 relay provides battery voltage to ignition coils and fuel injectors. If necessary to check operation of IG2 relay, see IG2 RELAY under MODULES, MOTORS, RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING - V6 & V8 article. IG2 fuse and IG2 relay are located in fuse/relay box at driver's side front corner of engine compartment.
  7. Check resistance of camshaft position sensors. 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, OVERHAUL & INSTALLATION - V6 & V8 article.
  8. 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, OVERHAUL & INSTALLATION - V6 & V8 article.
  9. 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, P1315, P1320 or P1325 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.
  10. 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 ENGINE CONTROL MODULE LOCATION  table. See WIRING DIAGRAMS article. 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).
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