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2000 f250 7.3 diesel glow plug relay stays on after cranking engine. Replace relays, check fuses, changed alt. Where do I continue the search. Glow Plug Controll Modual?

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  • SD Earp
    SD Earp Feb 10, 2014

    The 7.3 engine is up to operation temo. and when I try to start it the glow plug relay stays on and energizing the glow plugs. Could it be the starter relay, EOT sensor, Barometric Pressure Swnsor? All play a roll in turning off the glow plug relay. I still wondwr if it is the PCM or the Glow Plug Control Modual wjich os different from the relay. What do you think

  • SD Earp
    SD Earp Feb 10, 2014

    sorry fir the miss spellings this phone has a small keyboard and I have large fibgers. To all who answer and help me with this problem I say Thank You.

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  • Expert
  • 71 Answers

When started cold it will remain on until engine reaches half of operating temperature

Posted on Feb 10, 2014

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Posted on Jan 02, 2017

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snownbird33
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SOURCE: Glow PLugs and Relays

Good Day
The glow plug relays are located on the right front shock tower. Remove the cover and you will see two relays If I remember I think they are round, but not sure.

Please let me know how you make out and if there is anything else that I might be able to help you with.

Cheers

Posted on Sep 17, 2008

steve_e_uk
  • 1675 Answers

SOURCE: How do i replace my VW SHARAN 02 glow plug relay.

the glow plug relay is a little black box normally located in the fues box, the relay regulates power to the glow plugs, if the relay is not functioning correctly the plugs will not heat enough or, you will have to allow a longer time to let them heat up, it acts like a switch as such, when you turn on your ignition it switches over to make a contact inside, which inturn starts the heating prosess of the glow plugs when they are at the correct tempreture or the onbored computer detects they are it then switches back , without it , say just using a fuse instead, your glowplugs will just get hotter and hotter till they melted, and no you dont have to change the glow plugs hope this helps, ime not good at explaining stuff in writing lol

Posted on Jan 30, 2010

Testimonial: "Good advice, I understand the concept of what i need to replace, now i can sort the problem out myself. CHEERZ u guys save us ppl money and time. "

  • 37 Answers

SOURCE: working on 2006 dodge sprinter

I did this exact thing.. I see your date of posting is a while ago, however let me know how you ended up.. If you leave the battery connected while installing the relay you can short it out causing the problem all over again.. also there is a couple points that run along that wiring harness that are known to rub through.. let me know how you did!

Posted on Feb 03, 2010

rony_masc
  • 83 Answers

SOURCE: I have a 1983 Toyota pick up w/ a 2.2 diesel that

first of check the glow plug or heater plug! be careful while removing heater plug from engine. due to aged vehicle, heater plug may crack and will remain there, and if that happen head of engine must be opened. check the heater plug by giving 12v dc current. give positive at top portion and negative at middle, and take alook whether heater plug is heating or not?

Posted on Jan 14, 2011

  • 1 Answer

SOURCE: 2000 GMC W3500 diesel (ISUZU NPR),cranks but no

fuel line pick-up broken in the fuel tank

Posted on Feb 14, 2011

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Why the diesel pump nissan hardbody is not getting the power


DIESELS DO NOT START FOR ONLY 3 REASONS.. 1. not getting fuel. 2. Glow plugs not working.. 3 major engine damage
1. air in system.. like you ran out of fuel, Fuel filter clogged, lift pump not working, no fuel in tank, Bad fuel. .. 2. glow plugs..check the wire at the glow plug to see if it has power. If it does not check the relay and fuse. glow plugs usually do not all go bad at one time. 3. major engine damage.. you would normally notice this by the noise the engine makes or it would not turn over..

May 25, 2014 | 2000 Nissan Maxima

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I bought a van 2003 Mercedes mb140 diesel. Is always gone and Also the mechanic gave me the ok. Then i wanted to sue but the light for the engineering start didn't turn on anymore so the engine didn't...


check the glow plug relay / and fuse. if thats ok then you will need a meter on the glow plug wire to see if there is any resistance on the glow plug its self. if the relay is at fault just change it. glow plug has no resistance then it needs changing. if the fuse has blown check the wire loom for the glow plug wires as they can get hot and earth to the engine.

Feb 22, 2014 | Cars & Trucks

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1986 ford f350 won't start


The solenoid click sounds very strong, implying that you have a charged battery and the ignition circuit is functioning out to the solenoid. Suspect an issue with the starter motor. Is the starter motor installed and connected properly?

Aug 11, 2013 | Cars & Trucks

1 Answer

I have 1987 6.9 diesel the wait to start light comes on for just a second then goes off. Glow plugs do not heat. I looked for a glow plug controller but can only find the relay. Not sure what the problem...


Not sure about this engine but some diesels have a relay that looks like a voltge regulator , like the one thats for your starter, and a seperate glow plug controller. Find out if you have 2 seperate components and consider checking both. 018c_2.jpg This what your relay should look like, The 7.3 L has it on top of the engine near the front and between the valve covers. Hold an insulated handled screwdriver to connect both larger studs and keep them connected for 30 sec.s, this jumps the relay. If your glow plugs work after this, then the relay is your problem.

Dec 02, 2009 | 1987 Ford F 250

2 Answers

I have a 1997 ford F350 WITH A 7.3L DIESEL, it turns over but will not start. My wail to start light or other indicator lights do not come on when I turn on the key.


The first thing to do is locate the owner manual.

Look for the glow plug relay MAIN FUSE location.

The glow plug portion of your van is not working.

This difficulty scale from 1 to 10 is a 9.

You will need a DVM and tool undo the cables to each glow plugs.

It's a 1 to 2 hours troubleshooting job.

I'm going to fire off a quick list

====
Check / replace blown glow plug relay main fuse
====

Disconnect each center nut of the glow plug wire. PLEASE CHECK ONE AT A TIME.

Read the resistance between the center of the glow plug and the metal base of the plug.

Please take good note on each glow plug resistance reading.

MAKE SURE all cables are put back and tighten properly.

Compare the resistance on all cylinders.

OPEN/high resistance is bad glow plug.

In general 3 ohm or less is OK.

You should buy one and use its value as baseline.

===

Glow plug relay can be bad.

You will need the VOM and a friend to turn the key.

Check the voltage to each glow plugs. It should be 12.6-13.6 volt.

Be careful,the plugs will get HOT.

Compare the voltage on each cylinders.

====
So the problem can be combination of

glow plug relay

glow plug relay main fuse

glow plugs

ignition switch is unlikely but I'm going to list it anyway.

Once again,this is a difficult and time consuming job. I will ask a friend to help out,

Good luck.


Jul 23, 2009 | Ford F-350 Cars & Trucks

1 Answer

Glow plugs causing starting problem


if you need connectors and terminals for the glow plug connections under the valve cover, Ford sells then so you don't need a whole $600 harness.

info for your use

Section 03-07B: Glow Plug System 1996 F-250, F-350, F-Super Duty Equipped with 7.3L Diesel Engines Workshop Manual
DESCRIPTION AND OPERATION Glow Plug System The 7.3L diesel engine uses a glow plug system which preheats air in the combustion chamber to improve cold engine starting. The system consists of eight glow plugs, the glow plug control module (12B533), powertrain control module (PCM) (12A650), engine oil temperature (EOT) sensor and barometric pressure sensor (BARO sensor) (12A644). The glow plug system is electronically controlled by the powertrain control module. The powertrain control module energizes the glow plugs immediately after the key is placed in the ON position and then determines how long the glow plugs will be on according to the engine oil temperature and the barometric pressure. The required time for the glow plugs to be energized decreases as the engine oil temperature and barometric pressure increase. The glow plugs are self-regulating, and the powertrain control module controls relay ON time. The powertrain control module protects the glow plugs by energizing them for short durations if the battery voltage is abnormally high.

Possible Causes: Insufficient glow plug ON time will not allow enough heat to accumulate in the combustion chamber to easily facilitate starting. If the glow plug system ON time does not meet any of the specifications in the accompanying chart the problem is most likely a faulty wire harness connection, ground connections or glow plug relay.

If the glow plug resistance to ground is high, the most likely causes are an open UVC (under valve cover) harness or open glow plug.
--------------------------------------------------------
Relay Operation
Install a DVOM on the glow plug feed side of the glow plug relay (large stud with two wires connected). Turn the ignition key to the ON position but do not attempt to start. Note the time in seconds from when the key is turned on and the glow plug relay energizes until the glow plug relay de-energizes. The glow plug relay makes a loud click noise which is easily heard when it energizes and de-energizes. The dome light will dim and the dash voltmeter will dip when the glow plugs are drawing current from the battery. Compare the times measured to the table (time will be affected by engine temperature, battery condition and vehicle altitude). The voltage at the glow plug feed terminal may vary from 9 to 12 volts depending upon battery condition.
--------------------------------------

-----
If battery voltage not present check for B+ at power supply terminal (terminal with single large wire). Power for glow plug power supply is supplied from starter relay through two fusible links at solenoid.
Glow Plug Operation
Disconnect all of the glow plug/injector harness connectors from the valve cover gaskets. With the pigtail installed, measure glow plug resistance to ground (preferably B-). A resistance measurement of .1 to 6 ohms indicates a good glow plug.



Glow Plug Harness Continuity
Measure for continuity from the connector harness to the glow plug feed terminal on the glow plug relay. Resistance should be less than 5 ohms.
Incorrect measurements will result if all glow plug/injector connectors to valve cover are not disconnected.

---------------------------------------------------
Glow Plug Relay The glow plug relay (12A343) has a plastic base and two mounting bolts. It is operated by the powertrain control module (PCM) (12A650) which senses engine oil temperature, PCM voltage and barometric pressure. When the engine oil temperature or the barometric pressure is low, the PCM activates the glow plug relay and the glow plugs. If the PCM voltage is too high, the powertrain control module deactivates the glow plug relay and the glow plugs immediately energize for a shorter duration, decreasing the modulation of the duty cycle.
-----------------------------------------------
Glow Plug Removal
  1. stj~us~en~file=ani_caut.gif~gen~ref.gif WARNING: THE RED-STRIPED WIRING HARNESS CARRIES 115V DC. SEVERE ELECTRICAL SHOCK MAY BE RECEIVED. DO NOT PIERCE.
    Remove valve cover (6582). Refer to Section 03-01D .
  1. Disconnect glow plug electrical connector using a pair of pliers.
  1. Remove glow plug using 10mm socket.
  1. Clean and inspect glow plug tip for damage. Replace if damaged.
Installation
  1. Install glow plug and tighten to 19 Nm (14 lb-ft).
  1. Connect glow plug electrical connector. Make sure glow plug wiring is routed to avoid moving parts.
--------------------------------------------------------------
Glow Plug Control Glow plugs are used to warm the cylinders to improve cold-engine starting. The PCM uses the engine oil temperature (EOT) sensor and barometric pressure (BARO) sensor to determine how long the glow plugs will be on. The PCM energizes the glow plugs longer if the engine is very cold or if the barometric pressure is low at high altitudes.
The PCM controls the relay that supplies power to the glow plugs with the glow plug control (GPC) signal. When the GPC signal is grounded by the PCM the relay closes, turning the glow plugs on.
The glow plugs are controlled by the following sequence:
  1. PCM energizes the glow plugs.
  1. The PCM energizes the glow plugs immediately after the ignition is placed in the ON position.
  1. The PCM then determines how long glow plugs will be on based on EOT sensor and the BARO sensor. The required time to warm up the cylinder decreases the engine oil temperature and barometric pressure increases at low altitudes.
Glow Plug Lamp Control The glow plug lamp (GPL) signal controls the WAIT TO START light located on the instrument panel. This light is used to indicate when to start the engine. The cylinders are being warmed by the glow plugs during and after this light is lit. The PCM energizes the glow plug lamp longer if the engine is very cold or if the barometric pressure is low.
When the GPL signal is brought low, the "Wait to Start" lamp is turned on.
The glow plug lamp is controlled by the following sequence:
  1. PCM lights the WAIT TO START light after a key on reset occurs.
The PCM determines the glow plug lamp activation time based on engine oil temperature, barometric pressure and battery voltage.
  1. PCM turns off the WAIT TO START light.
The glow plug lamp is turned off when the timer counts to the number of seconds specified by the PCM. The glow plugs will normally remain on longer than the "Wait to Start" lamp.
-----------------------------------

Mar 14, 2009 | 2004 Ford F350

1 Answer

Volks wagen golf diesel tdi Nreg


Check the glow plug thermo sensor...found in the cylinder head.
Unlightly anything wrong with injector pump.
Good luck
John

Feb 15, 2009 | 2002 Volkswagen Jetta TDI

1 Answer

Glow plug light


Thats not good, if the glow plugs are being charged the whole time They will burn out quickly if not already. Even if the glow plugs are burned out the engine will still start unless your in a really cold region. Sounds like the GP (GP = glow plug) relay is fused in the open position, its located above the fuse panel refer to your owners manual to its exact location above the fuse panel. Just pull this relay out and your light should go out while engine is running. If this works simply replace the relay from your local Volkswagen dealer, but the bad news is I would highly recommend pulling the GP's out and checking to see if theres anything left of them. There not built to be on constant. Good luck Hope thats your problem just a relay.

Dec 19, 2008 | 1991 Volkswagen Golf

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