Auto Service Professional

OCT 2017

Magazine for the auto service professional

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Page 43 of 77

42 | ASP October 2017 Technical identification (ECT PIDS) to verify sufficient glow plug on-time. Turn the ignition to the ON position and measure the glow plug voltage during the on-time, which may range between 1 to 120 seconds, again depending on oil temperature and altitude. Check glow plug resistance by disconnect- ing the glow plug bus bar connector. Measure the resistance between the glow plug bus bar connector, component side and battery ground. Disconnect the GPCM. Measure the resistance between the GPCM connec- tor, harness side and the glow plug bus bar connector, harness side. Glow plug to ground should be 0.1 to 2 ohms. Glow plug bus bar connector to GPCM connector should be less than 5 ohms. Check for poor connections or loose fitting pins. Note that incorrect measurements will result if all glow plug connectors are not disconnected. e glow plug monitor self-test is a key-on/ engine-running (KOER) test of the glow plug system. e self-test is carried out on-demand with the engine running and the A/C off. e PCM activates the GPCM which monitors the glow plugs. e throttle pedal may be used to increase engine speed to increase voltage if needed. Possible causes of concerns: • GPCM power circuits • Glow plugs • Glow plug bus bar • GPCM • Circuitry 6.4L Powerstroke fuel system e 6.4L Ford Powerstroke diesel engine, like its earlier cousins, features a low pressure fuel system that delivers fuel from the tank to the high pressure pump. e high pressure 1 – GPCM 2 – Black connector 3 – Green connector 4 – Cylinder 5 glow plug 5 – Cylinder 7 glow plug 6 – Cylinder 1 glow plug 7 – Cylinder 3 glow plug 8 – Cylinder 6 glow plug 9 – Cylinder 8 glow plug 10 – Cylinder 2 glow plug 11 – Cylinder 4 glow plug 12 – VBAT (vehicle battery voltage) 13 – Glow plug enable (GPE) 14 – Diagnostic communication 15 – VPWR (vehicle power supply voltage) Information courtesy of Motologic

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