Circuit Description

Ignitor keeps the ignition coil primary circuit grounded, allowing a magnetic field to be built up in the ignition coil. When the ECM signals the ignitor, the ignitor interrupts the primary circuit, causing the ignition coil to fire. Also, by the counter electromotive force generated when the primary current is interrupted, the ignitor sends an Ignition Confirmation Signal (IGF) to the ECM. If IGF signal is not input to ECM, the ECM will stop fuel injection as a fail safe function. Code P1300 is set if there is no IGF1 signal (No. 1 ignitor circuit) to ECM for 8-11 consecutive ignition signals. Code P1305 is set if there is no IGF2 signal (No. 2 ignitor circuit) to ECM for 8-11 consecutive ignition signals. Possible causes are:

• Open or short in IGF1 or IGT1 circuits.
• Open or short in IGF2 or IGT2 circuits.
• Ignitor malfunction.
• ECM malfunction.