Vauxhall Astra glow plug control module feedback circuit-low voltage- permanent & glow plug control module feedback circuit-high voltage- permanent

Car: Vauxhall Astra
Variant: 1.7 CDTI Mk6 J
Model Year: 2011

Categories: Electrics, ECU, Warnings & Lights

New set of glow plugs installed all reading <1 Ohm
Glow plug module replaced.
Temperature sensor replaced.
Earth points checked and cleaned
11v at glow plugs with ignition on timing out after 6 sec
No feed to GP once engine started from cold with above fault codes displayed

Posted: Feb 20, 2023 (1 year ago)

Mike

Points: 1

If the vehicle has started , normal for no feed to glow plugs as they are not needed ?

Posted Feb 20, 2023 (1 year ago)

whittingehame

Points: 38,790

Thanks for your reply.
My understanding is that the GP are used until the engine reaches normal operating temperature to aid omissions and reduce diesel knock, hence the 5 pin control module/relay. I may be wrong but I suspect this is linked to the “Glow plug control module feedback circuit-low and high voltage fault codec P307E & P307F.

Posted Feb 21, 2023 (1 year ago)

Mike

Points: 1

" After the initial pre-heating phase, the glow plug continues to glow for up to 360 seconds and is regulated by pulse width modulation for a higher degree of temperature accuracy. This prevents troublesome “knocking” during cold starts and reduces pollutant content of exhaust gases by up to 60%. "

Posted Feb 21, 2023 (1 year ago)

whittingehame

Points: 38,790

Replying to post by whittingehame:
" After the initial pre-heating phase, the glow plug continues to glow for up to 360 seconds and is regulated by pulse width modulation for a higher degree of temperature accuracy. This prevents troublesome “knocking” during cold starts and reduces pollutant content of exhaust gases by up to 60%. "

Thanks for your reply and information which dose help me build a picture of the module function. Wish I could find the cause of the fault codes as I’m running out of ideas and a little confused why I would get high and low voltage recorded at the module translating in to fault codes P307E &P307F.
Cheers

Posted Feb 21, 2023 (1 year ago)

Mike

Points: 1

Cant really suggest a solution , not a diesel fan and very rarely took any into the workshop for that kind of repair , preferring to send to local diesel specialist if my auto electrician could not see anything obvious .

Posted Feb 21, 2023 (1 year ago)

whittingehame

Points: 38,790

Thanks again for you4 reply which is really appreciated. Can you suggest anyone who specialises in this type of fault finding as I don’t want to just drop it off at a garage for them to go over what I’ve already replaced, considering the age/value of the car.
Cheers
Mike

Posted Feb 22, 2023 (1 year ago)

Mike

Points: 1

I only ever used a friend I knew for many years and respected for his skills and ability with fault finding in diesels that often the dealerships could not solve . Getting someone good like that who you can trust is like getting hens teeth . Unfortunately he retired a few years back . Finding the right place that are capable of correctly diagnosing , that will listen to what you have already carried out and take it from there will be very hard to find . I wish you luck in trying

Posted Feb 22, 2023 (1 year ago)

whittingehame

Points: 38,790

Deleted double post

Posted Feb 22, 2023 (1 year ago) Edited on Feb 22, 2023 (1 year ago)

whittingehame

Points: 38,790

Replying to post by whittingehame:
I only ever used a friend I knew for many years and respected for his skills and ability with fault finding in diesels that often the dealerships could not solve . Getting someone good like that who you can trust is like getting hens teeth . Unfortunately he retired a few years back . Finding the right place that are capable of correctly diagnosing , that will listen to what you have already carried out and take it from there will be very hard to find . I wish you luck in trying

Bring him out of retirement!!

Thanks for your support with this and appreciate your time.
Cheers
Mike

Posted Feb 22, 2023 (1 year ago)

Mike

Points: 1

Sorry I cant be of further help . My friend was a BIG miss when he retired and his knowledge and skills gained over many years are very hard for any one to gain or replicate .

Posted Feb 22, 2023 (1 year ago)

whittingehame

Points: 38,790

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Vauxhall Astra glow plug control module feedback circuit-low voltage- permanent & glow plug control module feedback circuit-high voltage- permanent

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