GPR won’t work

Reply Subscribe

Thread Tools

Search this Thread

Nov 22, 2024 | 09:51 PM

#16

ranchdweller

Thread Starter

5th Wheeling

Joined: Jun 2022

Posts: 28

Likes: 1

Quote:

Originally Posted by RacinJasonWV

I would try crossing the large lugs with a screwdriver for about 20 seconds before a cold start and see if that helps. That should lead us in a direction.

I can provide ground and the relay operates, then starts great.

Nov 22, 2024 | 10:31 PM

#17

JoshHefnerX

Laughing Gas

Joined: Aug 2023

Posts: 974

Likes: 361

From: Glendale, AZ

The air and gpr relays work similarly. If you're manually grounding out the one terminal on the relay and the relay lights up, the most likely is you have a bad/weak connection between the relay and PCM.

Nov 23, 2024 | 06:41 AM

#18

RacinJasonWV

Lead Driver

Joined: Jul 2017

Posts: 6,861

Likes: 2,335

From: WV

Quote:

Originally Posted by ranchdweller

what triggers the air intake heater? Could the AIH and GPR wiring be crossed?

From what I’ve read on FTE, the AIH is rarely turned on. During extended idle with some other factors if I remember correctly.

You could test it’s signal wire during initial key on (glow plug time). If they’re swapped then it should show ground at that time.

Quote:

Originally Posted by ranchdweller

I can provide ground and the relay operates, then starts great.

Thats good information. I can’t recall but it seems like @cleatus12r has previously explained how the PCM ground works and what can cause it to be weak.

Honestly, I’d probably check the wire and connector conditions and if nothing is found just activate the GPR ground by a momentary button inside the cab.