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Home >> Lexus >> 2002 >> IS 300 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1300: IGNITOR Circuit Malfunction >> Circuit Description

Circuit Description

ECM uses pick-up coil input signals to switch primary ignition circuit on and off. Primary circuit is turned off when ECM delivers a signal to ignitor on IGT wire, causing ignition coil to fire spark plug. After delivering a command to turn off primary circuit on IGT wire, ECM monitors ignition confirmation signal (IGF) circuit to confirm primary switching occurred. If IGF signal is not input to ECM, ECM will stop fuel injection as a fail safe function. DTC is set if there is no IGF signal to ECM for 2 or more ignition cycles and this is repeated 3 times during 6 consecutive IGT signals with engine running. Possible causes are:

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