Flashing Service Light
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Senior User
Joined: Mar 2010
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From: North Oregon Coast
Flashing Service Light
I am trying to get back to diagnosing a problem that I have had for years and was hoping for some input. A few years ago I had an issue with my IDM getting full of water and not running. I made the mistake of having it towed to a shop because I didnt have time to work on it. Ever since the day it came back from the shop, the "service engine soon" light will come on when it is cold and under load. If it is at operating temp or if it has had the block heater plugged in, it doesnt do it. If I accelerate and the light comes on, I can let up a little and it goes off. It runs fine but that light has me stumped. I have Autoenginuity and the code that I always get is in reference to the IDM. Before I pay for another IDM, what else can I do? I am thinking it is in the IDM, ICP sensor, IPR or maybe a weak HPOP are something in that area. One other question is, since I have aftermarket Stage 1 single shot injectors, is it possible that I need a different IDM like a 130v? I also have a DP tuner F5 chip. Thanks
Got Data?
Joined: Dec 2012
Posts: 4,248
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From: Lake Stevens, WA
I'd normally suggest pulling the chip and running stock and see if it does this. But with stage 1's you are probably stuck with the chip in place. Does the SES light come one if you are running the DP on a stock tune?
Can you list the IDM code you are getting for us?
Connectors might be a possibility - sometimes they work cold but not hot, or vise versa, when they start to let go.
It runs fine even when the light comes on?
Can you list the IDM code you are getting for us?
Connectors might be a possibility - sometimes they work cold but not hot, or vise versa, when they start to let go.
It runs fine even when the light comes on?
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Senior User
Joined: Mar 2010
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From: North Oregon Coast
If i remember correctly the last time i ran codes it was a P1316 IDM code. I can run it with the chip unplugged and on stock setting and it does the same thing. yes it runs fine when the light is on. The light only comes on when I am accelerating. If i were to accelerate really slow, it wont come on. This weekend I will run the codes, clear them and then run them again to get the exact code. It also has new UVC harnesses. I have run buzz tests and they all seem ok. What connectors should I be looking at?
It's a Van Gogh
Joined: Feb 2010
Posts: 7,812
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From: Elk Grove, CA
P1316 is common with UVCH failure. But if the buzz test is good you know the wiring is good. So the IDM is suspect again.
First check any new codes, and the underside of the thick harness that lies on the driver side valve cover that leads to the 42 pin connector. Common place for wires to chafe thru and cause shorts.
First check any new codes, and the underside of the thick harness that lies on the driver side valve cover that leads to the 42 pin connector. Common place for wires to chafe thru and cause shorts.
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Senior User
Joined: Mar 2010
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From: North Oregon Coast
That was one of the first things that I checked when this started happening. Does the IDM have to be programmed or different from a stock IDM since I have different injectors?
Hotshot
Joined: Jul 2008
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From: N.GA Mountains
The offending code may only be present when the light is on and go away when light is off.
I would look at ICP and IPR DC when the light comes on.
Hotshot
Joined: Jul 2008
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From: N.GA Mountains
I’ve replaced IDM and later gotten a P1316 code. Swapped IDM (under warranty from parts store) and code went away. 
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Tuned
Joined: Dec 2016
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From: Southern Middle TN
The P1316 code means the IDM has stored codes in it.
When my IDM dumped on me driving, it shut off and wouldnt start back up. Checking the codes I got the P1316 code I also had IDM stored P1293 High side open bank No.1. Open circuit, faulty IDM and P1294 High side open bank No.2. Open circuit, faulty IDM.
Usually P1316 has more codes along with it.
When my IDM dumped on me driving, it shut off and wouldnt start back up. Checking the codes I got the P1316 code I also had IDM stored P1293 High side open bank No.1. Open circuit, faulty IDM and P1294 High side open bank No.2. Open circuit, faulty IDM.
Usually P1316 has more codes along with it.
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Senior User
Joined: Mar 2010
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From: North Oregon Coast
I used AE to clear the codes this morning and then got the Service light to come on and the only code that pops back is the P1316. Is there a specific IDM that should be in the truck (IDM-120)? Is there any way to test the actual IDM? I have tested the connector back to the valve cover harness with a meter and had normal readings.
Butt-Head
Joined: Apr 2004
Posts: 9,448
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From: Reed Point, MT
To find out what code(s) is/are causing the P1316, you must do a key on engine off injector electrical test (buzz test). The P1316 tells you nothing other than the IDM telling the PCM that there is a code or codes stored.
Hotshot
Joined: Jul 2008
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From: N.GA Mountains
In my experience, P1316 as an IDM death code.
ONLY if I see this with other codes (low to high side open, etc) do I find the IDM is not the problem.
I have seen seen some WEIRD IDM failure modes, so this is certainly plausible.
ONLY if I see this with other codes (low to high side open, etc) do I find the IDM is not the problem.
I have seen seen some WEIRD IDM failure modes, so this is certainly plausible.
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