1. Glow indicator light description
The glow plug indicator light is mounted inside the combination meter. When the light goes off, it informs the driver the engine is ready to be started.
The glow indicator light operates independently from the glow plug. Thus, it does not indicate whether plug has actually heated up or not. The light lighting time is approx. 0- 1seconds. The light lighting time varies according to the coolant temperature and according to the engine models.
2. Operation of glow system (Super glow type)
Timer 1 and 2 inside the preheating timer or the emission control ECU are turned on after the ignition switch is turned to ON when the temperature of the engine coolant is low. Timer 1 turns on the glow indicator light in the combination meter. Timer 2 turns on the glow plug relay to let the glow plug generate heat. Timer 1 and 2 are turned on during the time in accordance with the temperature of the coolant. Then, they are turned off. When timer 1 is turned off, the glow indicator light is turned off. When the ignition switch is turned to the START, the preheating timer or emission control ECU turns the glow plug relay on, in order to prevent the temperature of glow plug dropping during starting and improve startability. When timer 3 operates, it turns the glow relay on for the time depending on the coolant temperature and effects after-glow when the engine is started and the ignition switch is returned to ON from START.
Fixed-delay Type Circuit
For the preheating system of the fixeddelay type, the preheating timer controls the glow indicator light lighting time and the time that the glow plug relay is turned on (preheating time.)
Indicator light lighting timeApprox. 5 seconds
Preheating timeApprox. 18 seconds Both are controlled at the fixed time.
Variable-delay Type Circuit
For the preheating system of the variable- delay type, the preheating timer controls the glow indicator light lighting time and the time that the glow plug relay is turned on (preheating time) in accordance with the engine coolant temperature and alternator voltage (which acts as the engine running signals).
Light lighting time:
Approx. 2 – 28 seconds
Approx. 2 – 55 seconds
Both vary according to the coolant.