Need help figuring out long CEL flash sequence?

[cjomanche]

Started the car this morning in 9 degree weather and it started right up.  Let it warm for a minute, went to drive off and it died.  Would not restart.  I jumped the truck using my portable battery pack, but now the CEL is on.  I’ve attached video of the code.  Can someone let me know what this is?  

 

Btw, I have a block heater.  Might be time to start using it.  

 

Thank you for your help. 

[Minuit]

12

Battery or power to the ECM disconnected in the last 50 key cycles.

 

35
Cooling fan relay.
Check relay and circuit. (can be caused by modifications to the cooling fan circuit. I noticed yours runs during the entire video)

 

22
Coolant sensor or circuit.
Check temp sensor and wiring.

 

76
Fuel pump bypass relay circuit.
Needs specialist or dealer diagnostics.

33
Air conditioning clutch relay.
Wiring to A/C clutch fault. No fault if vehicle is not equipped with A/C.

 

55
End of code.
Trouble codes finished or none recorded.

[cjomanche]

5 minutes ago, Minuit said:

12

Battery or power to the ECM disconnected in the last 50 key cycles.

 

35
Cooling fan relay.
Check relay and circuit. (can be caused by modifications to the cooling fan circuit. I noticed yours runs during the entire video)

 

22
Coolant sensor or circuit.
Check temp sensor and wiring.

 

76
Fuel pump bypass relay circuit.
Needs specialist or dealer diagnostics.

33
Air conditioning clutch relay.
Wiring to A/C clutch fault. No fault if vehicle is not equipped with A/C.

 

55
End of code.
Trouble codes finished or none recorded.

 

 

Thank you.  Can some of these be saved codes?  I recently had a lot of work done to the truck, maybe my mechanic didn’t clear them?  They weren’t causing the light to come on.  

 

Cooling fan, yeah.  I have a switch that turns it on and off.

 

Fuel pump was recently replaced.

 

No clue about the AC.  It’s been working fine.

 

i suspect 12 is what threw the code, since I started the truck with a jump.  

 

What’s the best way to clear the codes to see if the light comes back on?

[Minuit]

In my experience, 12 or 35 won't actually turn the check engine light on. At one point I modified the fan to be switched which caused a stored code 35, but it never turned the light on. I've also never had a CEL after a jump start or after reconnecting the battery. I suspect the code that's requesting the CEL is either 22 or 76, but I can't say for sure. I've had that code and a check engine light after starting the engine with the sensor unplugged. Is there damage to the wiring going to it? It's the sensor on the thermostat housing. How does the engine run?

 

Side note: I have absolutely no clue what code 76 actually is. I recently replaced my fuel pump too, but I went down to the garage and checked just now. My truck only has codes 12 and 55.

 

I'm not sure if or how long the system stores codes. I want to say it does, but I can't be sure. Have you tried clearing the ECU memory?

 

Disconnect positive battery terminal and touch it to ground for 30 seconds.
Reconnect positive battery terminal
Turn Ignition Switch to the ON position but do not start the engine
Turn headlights on
Turn headlights off
Turn ignition off

[gogmorgo]

I can't seem to make the video work on my device. I've tried a couple browsers. Usually I find uploading to YouTube (with privacy set to unlisted) more useful for cross-platform compatibility. No big though, I trust Minuit's interpretation. 

 

Colder weather than typical could potentially make a failing temp sensor more obvious, although 9°F isn't really cold enough to make a huge difference, at least not in my mind. I'd reset the codes and see if it comes back before doing anything else. I have had 22 trigger a CEL for me, although in my case it was the opposite end of the range, getting the engine hot enough with no coolant that it assumed there was a problem. 

I almost wonder if not heating up in a "reasonable" time frame could trigger the code. If some water froze up in the fan relay causing it to stick, I can see that causing the 35, and the fan running could have lead to poor heat build up, but that's just a guess. But it's worth pointing out that having the vents set to defrost also triggers the a/c to help dehumidify the air, and I'm pretty sure the a/c will trigger the aux fan.  Have you been seeing symptoms of thermostat failure? Like is it really slow to build heat, or does it run way hot? Again I wouldn't do anything until I confirmed the code 22 was hanging around unless there were other symptoms. Code 22 didn't kill my engine, just fired the CEL.

 

I've never had a 76 myself, but a fuel pump circuit failure will kill the engine. It wouldn't hurt to clean up the ground behind the driver's side taillight, and check the ballast resistor, or just bypass it. There's also a connector for the fuel pump that would have been unplugged during the change, down by the sending unit assembly that's worth checking if symptoms persist. If it wasn't quite plugged in right, the seal could have been compromised. 

 

For what it's worth, I've never had any code come up without a 12 displaying. It seems to be the ECU's way of saying "hey something happened". When the battery gets disconnected you get 12 and 55, like "hey something happened but nothing seems to be wrong".

As far as it not restarting without a jump, what was it doing? Did it crank and not fire, or was it acting like a dead battery? Maybe it got mad you called it a car?