[Mk4 Golf] ARL glow plug fault code po684 - TDI & Diesel Forum - uk-mkivs

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ARL glow plug fault code po684



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#1 Chippyba

Chippyba

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  • Golf IV GTI 1.9 ARL 150PS

Posted 21 September 2020 - 06:46 PM

Hi peps got a fault code for my ARL pd150 po684 glow plug to pcm static.
Done a simple glow plug test with a multimeter(positive probe on the positive of the battery n then checked the voltage through the glow plug via the negative probe,all reading 12 volts,) but also checked the harness like this and got a ground reading through the harness of 12 volts through all 4 glow plug connectors,also checked the plugs on the water heater,the plugs were good as got battery voltage n also checked the harness there n got no ground reading through that part of the harness for the water heater glow plugs,I've searched Google for answers but keep drawing blank about this
Tia


#2 Chippyba

Chippyba

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  • Golf IV GTI 1.9 ARL 150PS

Posted 21 September 2020 - 07:59 PM

Quick update done a continuity test from the loom plug up to the module under the skuttle I've got a ground continuity from engine earth to each pin on the plug up to the module





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