2011 Santa Fe 2.2 Crdi glow plug relay? - Hyundai Forums : Hyundai Forum
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post #1 of 13 (permalink) Old 11-27-2018, 01:32 PM Thread Starter
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2011 Santa Fe 2.2 Crdi glow plug relay?

hey,
The issue started when there was +4 celsius outside.
It seems like car glow plugs doesnt work at all. It starts rough. And now when theres like -8 celsius then car barely starts.
i got error code P0684 "Glow Plug Control Module to PCM Communication Circuit Range/Performance". I checked the voltage on relay, which was 12,..Volts but after relay to the glow plugs there was only 3,2V and it didnt change even when i started the engine. Could it be the relay or something else?
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post #2 of 13 (permalink) Old 11-27-2018, 01:50 PM
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Where are you reading the 3.2 volts? On the switch side at the relay?

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post #3 of 13 (permalink) Old 11-27-2018, 02:02 PM Thread Starter
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Where are you reading the 3.2 volts? On the switch side at the relay?
on the plug that goes to the glow plugs...that is coming from the relay..just before the glow plugs
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post #4 of 13 (permalink) Old 11-27-2018, 03:15 PM
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Is the relay controlled my a glow plug module? I don't have any circuit description or electrical diagrams for that.
This buy can probably help and he'll get to you today.
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post #5 of 13 (permalink) Old 11-27-2018, 07:03 PM
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i got error code P0684 "Glow Plug Control Module to PCM Communication Circuit Range/Performance". I checked the voltage on relay, which was 12,..Volts but after relay to the glow plugs there was only 3,2V and it didnt change even when i started the engine. Could it be the relay or something else?
3.2V at the plugs may be correct. The controller powers the plugs via PWM so you need to know what the control duty is to determine if the output voltage is correct or not.

It seems there where a bad batch of glow plug controllers fitted to some vehicles in 2011. I've attached a section from a Kia tech bulletin that tells you how to identify the defective controllers. The bulletin was issued for the Kia Sorento but it is fitted with the same 2.2 R series engine as the Santa Fe so I wouldn't be surprised if it's relevant to your vehicle too.

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post #6 of 13 (permalink) Old 11-27-2018, 11:59 PM Thread Starter
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mines part no. is 36830-2f050
lot no. is 09W
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post #7 of 13 (permalink) Old 11-28-2018, 06:16 AM
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OK, that bulletin doesn't apply then.

Have you checked the glow plugs themselves?

The quick and dirty way to test them is with a 12V bulb/test light.
Disconnect all the plugs,
connect one end of the bulb to battery positive,
probe the terminal of each plug with the other side of the bulb.
The bulb should light when you touch it to each plug. Any plugs that don't light the bulb are open circuit.

DO NOT connect 12V directly to the plugs. Your plugs are part of a PWM control system so they probably aren't rated at 12V and could be damaged.

The proper way to test glow plugs is by either my measuring their resistance or measuring their current draw, but I don't know the specs for your particular engine off the top of my head.
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post #8 of 13 (permalink) Old 11-28-2018, 06:45 AM
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FYI, I just looked up the glow plugs for your engine :

NGK CZ105 (90007)
7Volts/0.3Ohms

Good luck measuring 0.3 Ohms with a cheap hobby meter
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post #9 of 13 (permalink) Old 11-28-2018, 05:33 PM
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FYI, I just looked up the glow plugs for your engine :

NGK CZ105 (90007)
7Volts/0.3Ohms

Good luck measuring 0.3 Ohms with a cheap hobby meter
LOL
We did current tests on the Ford and GM diesels. Not sure with these PWM plugs that's a valid test. Can you enlighten me on that?
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post #10 of 13 (permalink) Old 11-29-2018, 04:40 AM
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Not sure with these PWM plugs that's a valid test. Can you enlighten me on that?
Yeah, it's still a valid test but you can't just connect one end of the Ammeter to B+ because the plugs usually aren't rated at 12V. You'd need to use the PWM output of the glow controller as the power supply.
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