When you turn your key on it goes through a system check and if no faults are found and nothing comes up on the display and you get no bongs then the system thinks it's ok. But worth a check around your glow plug connectors and as you say check with your mm.
Flack
26th Oct 2012 10:37 am
Wabtec-Developments
Member Since: 07 Sep 2012
Location: manchester
Posts: 11
Flack wrote:
When you turn your key on it goes through a system check and if no faults are found and nothing comes up on the display and you get no bongs then the system thinks it's ok. But worth a check around your glow plug connectors and as you say check with your mm.
Flack
checked with snap-on solus diagnostic this morning to see if the fault was enough to flag an error in the ecu but not activate the eml
does the ecu not self check the glow plugs for continuity?
cheers
will
26th Oct 2012 11:18 am
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20795
No, they need to be checked manually with a multi meter My D3 Build Thread
As DM says it's a manual check that's why I posted it would do no harm to check it
Flack
26th Oct 2012 1:28 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
They can be checked with a bespoke tester and I am sure most indies have one. Testing with a proper tester checks the primary and afterglow functions and ensures that the current draw is correct. I don't have one but have seen my indie use a Beru tester, which seemed a pretty handy bit of kit.
Not sure of the D3 plug specs (feel free to chip in if a member has them) but they typically draw about 13 amps with a peak of around 20 amps or so - above the range of most DIY multimeters. A resistance check is helpful (ground at a suitable point shiny metal bit of the engine and positive lead to exposed head of plug).
Clearly either a short or open loop is bad and a typical cold figure is around 0.9 Ohms (again, I don't have any book figures so check them all for a comparison but should not be too far off 0.9 Ohms).
Anyone got the book figures or an 'approved' method of testing them?Land Rover - Turning Drivers into Mechanics Since 1948
If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
Use the approved diagnostic system or a scan tool to retrieve any diagnostic trouble codes (DTCs) before moving onto the symptom chart or DTC index.
Make sure that all DTCs are cleared following rectification.
Symptom chart
Symptom Possible cause Action
Poor starting (extreme weather conditions) Glow plugs inoperative/inefficient
Fuel temperature too low
Check the glow plug harnesses at the glow plugs and at the connection to the main harness. Refer to the electrical guides. Check for glow plug DTCs. The fuel system recycles fuel until operating temperature is reached to reduce this possibility.
High cold-engine emissions After-glow phase inoperative
Check the glow plug harnesses at the glow plugs and at the connection to the main harness. Refer to the electrical guides. Check for glow plug DTCs. After-glow is designed to function at engine temperatures below 50 degrees C (122 degrees F), and below 2,500 rpm.
High cold-engine noise, vibration or harshness After-glow phase inoperative
Check the glow plug harnesses at the glow plugs and at the connection to the main harness. Refer to the electrical guides. Check for glow plug DTCs. After-glow is designed to function at engine temperatures below 50 degrees C (122 degrees F), and below 2,500 rpm.
DTC index
NOTE: Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5 digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last 2 digits give extra information read by the manufacturer-approved diagnostic system).
NOTE: For a full list of ECM DTCs, refer to workshop manual section 303-14 - Electronic Engine Controls.
DTC Description Possible causes Action
P038300 Glow Plug Control Module Control Circuit Low Glow plug relay, control circuit high resistance
Glow plug relay, control circuit short circuit to ground
Glow plug relay failure
Refer to the electrical guides and check the circuit. Check the relay operation. Repair/renew as necessary.
P038400 Glow Plug Control Module Control Circuit High Glow plug relay, control circuit short circuit to power
Glow plug relay failure
Refer to the electrical guides and check the circuit. Check the relay operation. Repair/renew as necessary.
P067000 Glow Plug Control Module Control Circuit / Open Glow plug relay, control circuit high resistance
Glow plug relay, control circuit short circuit to ground
Glow plug relay failure
Check the glow plug relay circuits. Refer to the electrical guides. Check the relay operation. Activate the relay and listen for an audible 'click'. Repair/renew as necessary. Clear the DTCs and test for normal operation.TLO has left the building.......
I no longer work for a Landrover Dealer
My little chilli sauce business http://www.thechillees.co.uk
if you would like to order anything just give me a shout
I have a tester like Robbie has described above I just connect it and it tests each glow plug out and even tells me if there is enough power in the battery to do the test..
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