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CIRCUIT DESCRIPTION, Inspection procedure. There DTCs indicate a malfunction related to primary circuit. A Direct Ignition System (DIS) has been adopted. The DIS improves the ignition timing accuracy, reduces high–voltage loss, and enhances the overall reliability of the ignition system by eliminating the distributor. The sparks of the 2 spark plugs passes simultaneously from the center electrode to the ground elec trode (No. 1, 5 and 3 cylinder) and from the ground electrode to the center electrode (No. 4, 2 and 6 cylinder). The ECM determines the ignition timing end outputs the ignition signal (IGT) for each cylinder. Based on the IGT signals, the igniter controls the primary ignition signals (IGC) for all ignition coils. WIRING DIAGRAM, Ignition Coil, igniter, ignition switch. Inspection procedure. Check spark plug and spark of misfiring cylinder, Check for open and short in harness and connector in IGF signal circuit between ECM and igniter, Disconnect igniter connector and check voltage between terminal IGF of ECM connector and body ground. CHECK: Measure the voltage between terminals IGT1 – IGT3 of the ECM connector and body ground when the engine is cranked.
Tags : center electrode, ground electrode, timing accuracy, check voltage, circuit description, signal circuit, toyota tacoma, ecm, spark plugs, spark plug, 2003 toyota tacoma, high voltage, ignition coils, igt, elec
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