Spark Test: 4Runner
- 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.
- Remove ignition coils. See IGNITION COIL under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Remove spark plugs. Install spark plugs to each ignition coil and connect ignition coil connectors. Disconnect injector connectors. Ground spark plug against cylinder block.
- 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. 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 ignition coils to 66 INCH lbs. (7.5 N.m). Tighten spark plugs to 14 ft. lbs. (18 N.m).
- 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.
- 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.
- 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.
- Check ignition IGT signal from Engine Control Module (ECM) to ignitor. If ignition IGT signal from ECM is defective, Diagnostic Trouble Code (DTC) P0351, P0352, P0353, P0354, P0355, P0356, P0357 or P0358 will be set in ECM memory to indicate an ignitor circuit malfunction. DTCs P0357 and P0358 apply only to 4Runner V8. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
- 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 ignition coils to 66 INCH lbs. (7.5 N.m). Tighten spark plugs to 14 ft. lbs. (18 N.m).ENGINE CONTROL MODULE LOCATION
Model (1) Location Avalon Behind Glove Box, Near Passenger's Side Kick Panel Camry, Camry Solara & Highlander Behind Glove Box Land Cruiser Above Glove Box, Near Passenger's Side Of Instrument Panel Sequoia & Tundra Behind Glove Box & Heater Duct Sienna Passenger's Side Of Instrument Panel, Just Below Glove Box Tacoma & 4Runner 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 5 seconds when checking for spark.