47 ELECTRICALS 17G. GLOW PLUG TIMER : Function It provides electrical supply to glow plugs for controlled period according to ambient temperature. Location It is located on the firewall inside the engine compartment. Connection details Fig. 51 Operating sequence a. ‘IG’ contact ‘ON’- indicator lamp burns upto duration as decided by zone control, lamp extinguishes as shown in table 1. Glow plug continues to remain ‘ON’ even after lamp has extinguished, engine should be star ted by making ‘ST’ contact ‘ON’. If engine is hot, ‘ST’ contact may be made ‘ON’ without waiting for indicator lamp to extinguish. However, if ‘ST’ contact is not made ‘ON’, the glow plug supply is switched after a period as shown in the table 1. This is a safety feature. b. ‘ST’ contact ‘ON’ - with ‘IG ON’, glow plugs continue to remain ‘ON’ while engine is cranked. Fig. 51 GLOW PLUG TIMER 5 1 3 4 2 7 6 (0C) TEMP Performance Check : 1. Lamp on time As per table 2. Safety shut Off time As per table 3. Post glow time As per table 4. Over voltage protection 14.5 + 0.5 5. Lamp output and glow plug output are short circuit protected. Table 1 : -30 30 40 200 -20 23 33 200 -10 17 27 200 0 10 20 200 10 8 18 200 20 6 16 200 30 4 14 120 40 4 14 90 50 4 14 60 60 4 14 30 70 4 14 15 80 4 14 0 TIME IN SECONDS PRE GLOW SAFETY SHUT OFF POST GLOW
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