No Test Bulb Flash
Check battery voltage at ECU with key on. Check ECU ground. Simultaneous WOT and coolant temperature switch contact, check both switches. No battery voltage to test bulb. Defective test bulb. Battery voltage less than 11.5 volts.
Check battery voltage at ECU with key on. Check ECU ground. Simultaneous WOT and coolant temperature switch contact, check both switches. No battery voltage to test bulb. Defective test bulb. Battery voltage less than 11.5 volts.