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Old 11-14-2021, 03:20 PM   #1
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Default Check engine light

Situation: Bought this truck of of my buddy after we had taken the motor out for a little refresh, after putting the motor back in, it has had this check engine light. The CEL has been on for probably a year or so.

Symptom(s): Barely noticeable; but the truck has a spastic idle, it will stay normal and dip to about 1k rpms periodically. Never dies, just bogs sometimes on idle

I pulled the codes from the CEL and I got P0450, P0443, P1130, and P1445.

I checked some wires and some hoses, but to be frank, I don't know where to look or what I'm even looking for.

Any insight on the situation would help. What kind of tools will I need or what parts I need to replace??
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Old 11-14-2021, 06:08 PM   #2
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Quote:
Originally Posted by Honeyhardbody View Post
I pulled the codes from the CEL and I got P0450, P0443, P1130, and P1445.
P0450 - Evaporative Emission Control System Pressure Sensor Malfunction
https://forums.nicoclub.com/obdii-em...s-t167636.html

P0443 - Evap code
https://forums.nicoclub.com/p0443-ev...e-t601347.html

P1130 - Swirl control valve solenoid
https://forums.nicoclub.com/swirl-co...e-t614488.html

P1445 - Purge Volume Control Valve error
https://forums.nicoclub.com/p1445-er...h-t204423.html

Looks like you have evap problems. These seem to all be (somewhat) related.


HTH...

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Quote:
Originally Posted by Deerhurst
What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
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Old 11-14-2021, 07:14 PM   #3
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So what I found when I went digging through all the tubes is that one was disconnected from the canister (I think).
It was attached the the rear of the air tube apparatus and connected to a large black can looking thing

Anyways, attached that tube and cleared the codes, went for a little drive and the light did not come back on and it was having a much easier time idling.

My question is, would one tiny hose cause all four codes?
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Old 11-14-2021, 07:50 PM   #4
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Simple answer: Yes...

Glad you found the problem...

Try fixing a 2020 ANYTHING like this. Not gonna happen!



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Quote:
Originally Posted by Deerhurst
What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
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Old 11-15-2021, 12:40 AM   #5
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The emissions controls are federal requirements that Nissan had to abide by. If the ECU detects an issue with the emissions, it puts the engine into limp mode and throws the Check Engine Light (CEL) on until the truck is taken back to the dealership and repaired.

It doesn't mean anything was wrong with the vehicle. It just means the emissions were not being controlled, so the ECU created the problem until it was addressed.
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Old 11-15-2021, 12:58 AM   #6
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jp is exactly correct on this.

I inadvertently switched two of the small hoses for the Swirl Valve that goes from the vacuum gallery(gold metal tubes) from the engine to the 4 vacuum tubes where the vacuum switch is located above the right front tire. Had me scratching my head on what was wrong too. I finally detai traced every single hose and found those two hoses switched. CEL turned off after that.

But, yes, one hose not connected or improperly connected will throw a code(s). The manual even states this as one of the potential problems.

Glad you found it!
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Old 11-17-2021, 12:04 AM   #7
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Thumbs up This is gonna eat away at me

So, after I found that disconnected hose and cleared the codes. Driving home from work today, hit the 50 mile mark and the CEL is back on. Ran the codes as soon as I got home and here's what I got:

P0443 - Evap. Emission system Purge control valve circuit
P0450 - Evap. Emission system Pressure sensor switch
P0446 - Evap. system emission system vent control circuit

As I know by now, all these codes are pretty closely linked to each other. My main question is, Is there a fuse for this? AND Maybe we didn't plug something back in when we put the motor back in.

I'll go digging tomorrow and find more stuff, I just know there are some Hardbody gurus on here that know more than I do.

Thanks so far for the help. Hopefully I can help someone else in the same boat
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Old 11-17-2021, 01:41 AM   #8
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My suggestion would be to download the manual and use the troubleshooting flow charts for each component. The manual will give you exact pins and voltage readings. Also, just know that the “circuit” also pertains to hoses, connections, wiring etc. It’s not just the component itself.

jp2code has the manual link in his signature…
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Old 11-17-2021, 01:47 AM   #9
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Quote:
Originally Posted by PorknBeans View Post
jp2code has the manual link in his signature…
I do!

Here is the short cut: 1996 EC.pdf

You don't need the whole Service Manual (though it doesn't hurt to download it while it is available). You only need the EC section.
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Old 11-17-2021, 03:48 AM   #10
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^^^Correct!

The EC Section is an invaluable section when codes are involved.
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