Spark Test: Tacoma
- Remove necessary components for access to ignition coils located on top of valve cover. Disconnect electrical connectors at ignition coils. 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.
- 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 exists, reinstall components. Tighten spark plugs to 15 ft. lbs. (20 N.m) and ignition coil bolts to 88 INCH lbs. (9.9 N.m).
- 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.
- 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 15 ft. lbs. (20 N.m) and ignition coil bolts to 88 INCH lbs. (9.9 N.m).
- Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal (Black/Red wire). If battery voltage exists, go to next step. If battery voltage does not exist, check Black/Red wire between ignition switch and ignition coil. See WIRING DIAGRAMS article.
- 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, OVERHAUL & INSTALLATION - 4-CYLINDER article.
- 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 - 4-CYLINDER article.
- 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 TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
- 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 15 ft. lbs. (20 N.m) and ignition coil bolts to 88 INCH lbs. (9.9 N.m).ENGINE CONTROL MODULE LOCATION
Model (1) Location Camry CNG & Gasoline Models, & Camry Solara Behind Glove Box Celica In Engine Compartment, Below Cover, Just In Front Of Battery, Next To Driver's Side Strut Tower Corolla Behind Stereo On Instrument Panel, Just In Front Of Center Console ECHO & Highlander Behind Glove Box MR2 On Inside Of Firewall, Directly Behind Driver's Seat & Luggage Compartment Prius Behind Glove Box RAV4 Near Passenger's Side Kick Panel, Just Below Instrument Panel Tacoma Behind Glove Box (1) For illustration of ECM location, see THEORY & OPERATION article.
CAUTION:
To prevent gasoline from being injected, DO NOT crank engine for longer than 2 seconds when checking for spark.