Toyota HZJ105 glow plug light stays on

Submitted: Thursday, May 11, 2023 at 20:57

ThreadID: 145633 Views:2839 Replies:5 FollowUps:4

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Andrew A13

Has anyone had the glow plug light stay on and fixed it. Replaced the relay on the left guard under the bonnet, no change. The glow plugs go off but the dash light stays on. Tried Toyota dealer, they checked the vacuum controls for the EGR all good. Replaced EGR ECU, light still on.

Help please.

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Reply By: qldcamper - Friday, May 12, 2023 at 07:35

Friday, May 12, 2023 at 07:35

Has anyone bothered to check that all glow plugs are drawing current.

AnswerID: 643546

Follow Up By: Andrew A13 - Friday, May 12, 2023 at 08:01

Friday, May 12, 2023 at 08:01

Yes Glow plugs are work correctly.

FollowupID: 923221

Reply By: PeterInSa - Friday, May 12, 2023 at 09:22

Friday, May 12, 2023 at 09:22

Re (Yes Glow plugs are work correctly.)

Checked with a Scanner for your Vehicle?

AnswerID: 643547

Follow Up By: Andrew A13 - Sunday, May 14, 2023 at 13:46

Sunday, May 14, 2023 at 13:46

Thanks Peter, Toyota found Diagnostic codes 22 Temp sensor checked OK 31 and 41 do not exist.

FollowupID: 923257

Reply By: Member - DOZER - Saturday, May 13, 2023 at 08:31

Saturday, May 13, 2023 at 08:31

fastglow relay fault, or you have a earth feeding it via something you installed like spotties or fridge etc....what did you install prior to this start happening??

AnswerID: 643559

Follow Up By: Andrew A13 - Sunday, May 14, 2023 at 14:04

Sunday, May 14, 2023 at 14:04

I haven't added anything new

Glow plug relay and EGR ECU

ECU

all accessories have been installed for a long time. I replaced the glow plug relay on the guard. I fitted a second hand Emission ECU. If I disconnect the small plug the light goes out and the car still runs. I will check all the earth leads.

Thanks Dozer

FollowupID: 923258

Follow Up By: qldcamper - Tuesday, May 16, 2023 at 07:07

Tuesday, May 16, 2023 at 07:07

Check the continuity of the wiring between the ecu and the relay and also the current shunt if it has one.
Has the vehicle done much beach work?
Wouldnt be a bad idea to hit toyota up for an electrical schematic of the vehicle if they are unable to pinpoint the problem.

FollowupID: 923280

Reply By: Member - LeighW - Tuesday, May 16, 2023 at 16:45

Tuesday, May 16, 2023 at 16:45

I'm surprised that Toyota couldn't fix the problem.

The schematic I looked at shows the lamp is normal controlled by the glow plug timer circuit as with most Toyotas.

However the EGR module can also brings up the "glow plug" light but not in response to the glow plugs being turned on, I suspect the engine managment system has detected one of the glow plugs is faulty when the engine is being started and uses the EGR ECU to bring up the lamp to indicate a fault. Have you checked each of the glow plugs to see they are not open circuit and that they are getting power?

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AnswerID: 643592