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Bluenozer
Top Member
Canada
644 Posts |
 Posted - 03/08/2019 : 05:41:39 AM
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2004 Bluebird(IH) t444e engine
4h597631 last eight of vin
Hard start ecm not giving my GPR(glow plug relay) ground
have 12 volts at relay and exciter has 12 volts
my wiring from relay to valve cover gasket .2 ohms and holds 12 volt load
glow plug readings from valve cover gasket all in spec 2.2ohms average across all 8 of them
unplugged my EOT(engine oil temp.) still no ground from ecm (heard that ensor unplugged should cycle relay for 2 mins (not sure if this test is correct)
anyway aiming at a bad ecm
anybody can confirm these conditions or did i miss something
Thank you taking time to try to help |
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tigger2
Advanced Member
USA
470 Posts |
Posted - 03/08/2019 : 1:26:12 PM
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| Check out the engine temp switch I think the ECM needs to see colder temps in coolant to cycle the glow plug relay. We haven't had any Internationals since 2000. |
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Bluenozer
Top Member
Canada
644 Posts |
Posted - 03/11/2019 : 02:34:19 AM
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Thanks for reply , and all temperature sensors are reading in spec, double checked with infra red temp. gun
and these stupid engines are a hard start in summer if one or two glo plugs are bad these engines are boat anchors man |
OEM trained in wiring and all engine platforms for over 20 years
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peter2019
Senior Member
125 Posts |
Posted - 03/11/2019 : 05:38:01 AM
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| Yes, They are boat anchors, a little bit better than vt365 but not much, just wondering if your bus hard to start in summer, why you think it's glow plug issue, you donot really need glow plug in summer to start bus. |
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Bluenozer
Top Member
Canada
644 Posts |
Posted - 03/11/2019 : 08:28:20 AM
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Just started doing one day , never had issue with unit till now lol
Power does not cross relay, everything is there except a ground signal on one of the small terminals and it comes from ecm can give it ground and it works but can't leave like that or the go plugs would be on whole key is on |
OEM trained in wiring and all engine platforms for over 20 years
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muddywater
Senior Member
USA
50 Posts |
Posted - 03/11/2019 : 10:17:44 AM
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| Is a sister bus ecm swap a possibility? |
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Bluenozer
Top Member
Canada
644 Posts |
Posted - 03/12/2019 : 02:44:59 AM
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we have many t444e buses in bone yard , swiped an ecm and BAM gave my GPR its ground , tested it this morning left unit outdoors and success it fired right up
Thank you for your time and input |
OEM trained in wiring and all engine platforms for over 20 years
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Help please
