EST means Electronic spark trigger......code 42 is for low coil driver signalmor current......
EST1Low: (Electronic Spark Trigger) is a current driver signal and normally set if the signal from the SECM is shorted to ground.
Check coil driver wiring and connector for shorts SECM PIN 7(EST1) to COIL PIN A
Verify GND on COIL PIN B Verify GND on COIL PIN C Verify GND on COIL PIN D Verify +12vdc on COIL PIN E
To check the Smart Coil internal circuit disconnect the coil connector and measure the resistance from pin to pin
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