GP Control switch
#1
GP Control switch
I have been having problems with starting my truck and a buddy of mine looked and my chiltons and thinks that my problem may be my Glow Plug Contol Switch. I guess it threads into the "left cylinder head coolant jacket" Has anyone ever had to replace this swicth and does anyone know part #'s? Thanks a bunch
#2
Join Date: Apr 2004
Location: Silver Lake Dunes, MI
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Nope it doesn't exist! Chiltons might be for an IDI. The Glowplugs are controlled by the PCM and refer to the oil temp, barometric pressure and I think the Intake air temp to calculate GP on time.
Check the relay with key on for power on both larger lugs. this is best with two people so you don't have to wonder if the relay already turned off. If you don't have power on both and the relay clicks you need a new relay. if you have power on just one and no click you either need a relay or there is a control side problem. The PCM controls the ground side of control circuit. so one of the small terminals should have a constant 12 volts with the key on.
Check the relay with key on for power on both larger lugs. this is best with two people so you don't have to wonder if the relay already turned off. If you don't have power on both and the relay clicks you need a new relay. if you have power on just one and no click you either need a relay or there is a control side problem. The PCM controls the ground side of control circuit. so one of the small terminals should have a constant 12 volts with the key on.
#3
#6
Originally Posted by tjbeggs
Time to check the ohm readings on the GP. Also could be shorted to ground. Might need to pull the valve covers and make sure none of the wires are rubber a push rod.
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