II-135
WSM Minor Change II Service Engineering Section
Glow ON/OFF Conditions
The glow will turn ON under any of the following conditions: The engine revolution is 1000 rpm or below; the
engine oil pressure switch is OFF (the input terminal of the engine oil pressure switch is H); the charge is
OFF (the L input terminal is H). If these conditions are not satisfied, the glow will be turned OFF because
controller unit judges that the engine has started.
Relationship between Water Temperature and Dots
The gauge of the water temperature uses four dots vertically and 34 dots horizontally.
The relationship between the water temperature and dots is shown below.
Refreshment Cycle of Number of Dots
The average temperature of 721 samples obtained at 6.9344-ms intervals (6.9344 ms x 721 = 5 s) is con-
verted into the number of dots to refresh the display.
Glow Control (Others)
1. If the grounding of the motor to the engine is improper, the voltage may sneak to the glow relay, thus
always turning the glow relay ON. Therefore, when the key is not at the start position, the glow relay will
be turned OFF.
2. If the battery is discharged while the key turned ON (In case operator left the key ON) and when the bat-
tery voltage is close to the level of triggering the CPU, the following operation may be repeated.
The microcontroller starts and turns the glow relay ON to perform auto glowing.
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The glow current flows and the battery voltage drops because the glow relay is turned ON.
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The microcontroller is reset.
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The battery voltage rises because the microcontroller is reset and the glow relay is turned OFF, when
no current flows.
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The microcontroller is triggered and the glow relay is turned ON because the battery voltage rises.
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The above sequence is repeated. Then glow relay contact may have chattering and be damaged.
The glow relay will be always turned OFF in order to prevent the chattering of the above glow relay when the
voltage is 7.5 V or below. The similar process will be performed for the relay for the working lamp.
This know - how is to protect the relay itself.
Enlarged view of water temperature gauge
Relationship of Water Temperature and Number of Dots Relationship of Water Temperature and Number of Dots
(Graph)
Water temperature Dots
40 0
70 14
100 17
110 20
125 34
140 34
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