Nissan D21 Hardbody Error Code Reading

[@fungdart]

Worked like a charm. On my '94 D21 4wd, KA24E. Got error code 41. Was the intake air temperature sensor. Easy fix. It's right under the air filter on the passenger side. Thanks for the video. It saved me a lot of headache.

[@everydayinterviews615]

Hey when I plug in my obd2 sensor it won't read???? Can I pass emissions w that or no? Also did you obd2 scanner not connect too?

[@joshuacruz4046]

What were your symptoms?

[@fungdart]

@@joshuacruz4046 I didn’t have any except the check engine light was on. It ran normal still from what I remember but it was a few years ago.

[@unleashedxauto]

Good tip. I recently bought an ECU from you on infamousnissan, worked out good.

[@jp2code]

Glad it worked out for you

[@royjames1742]

⁠​⁠​⁠@@jp2code rebuild the engine in my 94 D21 road back and forward to New Orleans to visit my son at university hospital for about 3 weeks got in it Saturday of the third week truck won’t start no head light no horn put in a new ignition switch and it still wouldn’t start had towed to the shop that did the work and I’m told the computer is bad truck has new battery and a new starter I was told that they jumped starter it but when they tried the computer the truck killed they also put the wrong battery in it with 850 cranking amps could that have damage the computer please help Thanks

[@jp2code]

@@royjames1742 My truck has an 850 CCA battery also. That isn't the problem. What likely happened is that they bought a battery with the Postive and Negative battery posts on opposite sides, and that caused them to connect the battery backward. If you have fusible links, it blew them out: www.infamousnissan.com/forum/showthread.php?t=35558 If the fusible link to the ECU is blown out, the ECU will not get any power from the battery. If some idiot removed the fusible links from your truck in the past because they didn't know what they were for, then connecting the battery backward would result in the ECU getting fried and likely the injectors blowing out, too. Fusible links are sold on eBay: www.ebay.com/itm/364828417166

[@3RAN7ON]

hey @jp2code! I recognize your name from the Nissan forums. Thanks man!

[@koolklif]

awesome video..as a longtime hard body driver I am suscribed!

[@doughgarcia6086]

Is this the only way to ckeck for a code

[@jp2code]

There is a guy on Infamous Nissan that will make a dongle that makes it easier to read the codes, but they are still blink codes. Here is the link: www.infamousnissan.com/forum/showthread.php?t=46719 In there, you will see a few of my videos where I bought and installed one. It's a lot better than removing the seat every time!

[@doughgarcia6086]

Thank you for the information yeah I don't want to have to.take the seat off everytime lol

[@jp2code]

@@doughgarcia6086 LOL Yeah, that's a real pain in the ass!

[@doughgarcia6086]

I am trying to register for that site you sent me and I am stuck on the referral name Everything I put is wrong lol Or I just don't understand what they want...

[@jp2code]

@@doughgarcia6086it needs a referral? I'd just leave it blank. You could use me, jp2code, if it requires something.

[@jjsiegal1]

You are the Man.... Thanks for sharing this info....~

[@AK-lv3xz]

1:30 is the story of my diagnosing of this lol thanks bro

[@TheHandsomeRyan]

Thank you for the great video. I unfortunately could not get it to work on my 94 D21. The two lights come on when the key is switched to the on position but it never goes into diagnostic mode when I turn the dial. Any ideas? I'm sure the truck is in the "on" position (not just accessory) and the dial spins and stops just as I would expect it to. The lights just never blink for diagnostic mode.

[@everydayinterviews615]

Mine is a 96 I have no lights on it unfortunately. But when I plug an obd2 sensor up to it won't connect.

[@jp2code]

Apologies for missing this, Ryan. It sounds like your ECU is bad. Some people have opened the ECU to find parts that were burned inside and fixed those, but I suspect they were pretty skilled at electronics already. Otherwise, there isn't much you can do but replace it. If there are no other issues with the ECU, I would just ignore reading the codes.

[@cybergamesmatamorostamauli4456]

On my computer, while I start the truck, both LEDs (red and green) go out and the truck is not starting either. Then with the key on the two LEDs turn on again and I can even get the codes, but if I turn the ignition on again, the two LEDs turn off again. Does this mean that the computer is failing? Or will it be normal for the LEDs to turn off while it is sitting? Greetings.

[@jp2code]

So the ECU lights do not have power when the engine is cranking?

[@cybergamesmatamorostamauli4456]

That's right, and I don´t know if that is normal.

[@jp2code]

@@cybergamesmatamorostamauli4456 is this, perhaps, SarjentStupid on Infamous? I know he's working on his truck right now and trying to read codes.

[@jp2code]

@@cybergamesmatamorostamauli4456 most electronics turn off because cranking the engine is the most electrical intense routine that the battery does. I know the ECU has to stay ON to operate the injectors and other components, but I don't know off hand if the Red and Green diagnostic LEDs remain on or if they turn off also. I suspect they turn off, but I do not know this.

[@joshuacruz4046]

@@jp2codehey it seems like you know your fair share on these trucks. I have a 94 that only turns on red with no green I have tried to put it on diagnostic setting with no luck any tips or help ?

[@semsticks]

Tks for the awesome post, after reading the codes in mode 3, anything special you need to do such as does the truck need to be in mode 1 to run Ect???tks Sigs70

[@jp2code]

Nothing special. If you have codes that you want to clear out, leave the ECU in Mode 4 or 5 when you turn the key OFF and they will be erased.

[@semsticks]

@@jp2code Thank you tons,,, my Computer was sent off for repair re installed and didnt pick up due to the diagnostics screw being out, ran the test as shown in ur post and code 55 showed no faults, thank you you just saved me tons on $$$$ Sigs70 in TX

[@Health_Fitness805]

Great video thanks!

[@MrPtotheErry]

Any idea what the 4 pin blue pigtail next to the ecm goes to?

[@jp2code]

No, sorry

[@madcook1936]

What year is your truck 94 or 95 and is there a junction box on the other side that works the blinkers mine when out and I was told there is a box under the seat for the blinkers

[@jp2code]

Shows "Linked Comment", so you may not get this. There is no other junction box. This is on the 1994 truck, but the driver's side is only for the Cruise Control Module, if your truck were equipped with it.

[@ForgedEnigma895]

jp2code I have the module under the driver's seat also but my 95' 2.4L manual doesn't have cruise control, any ideas on what mine is running? Also I would like to learn about how to work the ECU if you are willing to teach.

[@jp2code]

Under the driver's seat should be the door lock timer and the rear antilock break module. i.imgur.com/YabXD0Q.png

[@ForgedEnigma895]

Thank you, it looks to be the anti-lock brake module. Where did you learn the codes for the ECU?

[@jp2code]

It's in the EF & EC section of the Service Manual. If you don't have a digital copy, get one from here: www.nicoclub.com/FSM/Hardbody/ I just know one day that site will be gone.

[@tannercrandell4016]

my trucks been running very rich, stalling, horrible gas mileage, misfiring, etc. checked my ecu and only threw a ecm code, is my ecu faulty?

[@jp2code]

They go out, particularly if your truck doesn't have the fusible links anymore. Fusible links prevent electrical surges from damaging the electronics like fuel injectors and the ECU.

[@jakesterphillips8904]

I have a 87 nissan sentra the ecm looks similar but no knobs to rotate. Just an on & off switch and green/red light. When the ecm is on it just flashes green slowley. Any idea how to check the codes on the model I'm describing?

[@jp2code]

Sure do! I've got a thread on how to read and diagnose problems here: www.infamousnissan.com/forum/showthread.php?t=31527

[@patsmith5236]

how did the black ecu cover come off? mine has no screw on the outside for cover removal.

[@jp2code]

Just lift it up. It pops off. No screws.

[@patsmith5236]

@@jp2code I just found your reply- thank you!

[@sledgehammer6759]

what year vehicle is that ?

[@jp2code]

Mine is a 1994

[@everydayinterviews615]

My truck has an obd2 but when I plug it up it won't read codes. It won't connect for some reason. Any help?

[@jp2code]

What year is your truck? 1996 and newer had OBD2. If you have that, you don't need this video. You just plug into the OBD2 port and read the codes.

[@jp2code]

If it won't work when plugged into the port, you have bad wiring to the port or a bad ECU.

[@everydayinterviews615]

@@jp2code yeah idk how it should look but there's only 4 wires plugged into the port. To blacks one red and one white

[@everydayinterviews615]

@@jp2code it won't connect I traced it back to the air flow sensor and one wire is broke on the female side. Watched a video and it said that if a sensor isn't connected then it won't connect to the obd2 plug.

[@samtate1953]

Bro is it hailing?

[@jp2code]

Lol Just a tin roof

[@richardtaylor761]

I have a 1996 Nissan pickup truck I do not have the. I do not have the lights on my The lights I changed it and it still will not run and crank the. Information? You. Gave me? Is not right? I changed everything from the fuel tank back to the computer.

[@jp2code]

Richard, I don't even understand what you wrote. It sounds like you forgot a lot of the words. Please proof read before you post.

[@richardtaylor761]

I have a 1996 Nissan pickup truck and I put a new computer. And it. Do? Not. Have? Light on it. What you was showing. And it's still not running. It cranks up and then cut right back off within 10 to 15 minutes.

[@jp2code]

Oh! That's probably because Nissan went to OBD2 starting in 1996. You can get a typical code reader and plug it in under the dash by the fuse box to read your codes.

[@juancaperon971]

does my 87 nissan d21 se v6 has it on the same spot?

[@jp2code]

Yours will be slightly different. See the 2nd video in this post: www.infamousnissan.com/forum/showthread.php?t=31527

[@matthewhoward5366]

Thanks man!

[@salg1907]

Hey brother I got code 32 as well. What dose this mean?

[@jp2code]

www.infamousnissan.com/forum/showthread.php?t=31527 Look up the code

[@salg1907]

Thank you you the man👍

[@johnathangriffiss961]

How did you replace the parts 32,23, and 51.

[@jp2code]

www.infamousnissan.com/forum/showthread.php?t=31527 23 = Idle Switch (fix wiring or replace it), 32 = EGR (clean it), 51 = Injector (find out which one is bad)

[@johnathangriffiss961]

jp2code what year is this again?

[@jp2code]

Mine is a 1994. I don't know what year yours is. Please visit the forum. My slow internet connection takes about 10 minutes to load this You Tube page before I can reply - every time.

[@johnathangriffiss961]

jp2code 95. Thanks. What's the point of the first codes flashing and then the real codes

[@popclutch_100]

Can anyone answer this question for me... my speedometer stopped working. I pulled it out of my truck and drove around like that for awhile. Maybe no more than 200 miles. I want do a motor swap maybe an sr20det motor, but I want the miles to match on the body. Is their anyone I can tell from pulling the original ka24de?

[@jp2code]

Is there anyone you can tell from pulling the original 🤔 Peter, I do not understand the question.

[@popclutch_100]

@@jp2code yes the cluster does work. I had to put the cluster because the speedometer stick would stop moving over 50 mph. Because of that I was driving around without my cluster and no I'm trying to know exactly the miles on the truck. I believe I only drove like 250 miles that's it's off.

[@jp2code]

If the speedometer was unplugged, there is no way to tell the actual mileage. The vehicle is over 10 years old, so it is exempt from odometer readings.

[@popclutch_100]

@@jp2code okay thank you for your assistance. In your opinion, does it matter to you if it is off a little?

[@jp2code]

@@popclutch_100 not at this point. Most of these trucks are in the 200,000 mile range, so even 1000 miles doesn't make much difference.

[@DRIFTD21]

What do you mean mode 2

[@jp2code]

Marcus, when the ECU blinks twice, turn the knob to select Mode 2 in the EC section of the Nissan Truck Service Manual. Mode 2 is typically used for testing if sensors are working. Mode 3 is for reading the error codes, again as outlined in the Nissan Truck Service Manual.

[@DRIFTD21]

jp2code okay. Did 3 and came up with 55 , did mode 1 and came up with 4

[@jp2code]

@@DRIFTD21 55 in Mode 3 means that you have no codes. I don't think Mode 1 has codes, but I could be wrong.

[@dwrightproductions8281]

Mine has no lights so ig that’s no good huh lol

[@jp2code]

Yeah. That sounds no good. You have the key turned on, right? I mean, like there is power everywhere but the ECU lights are not blinking? If that's the case, you might want to check the fusible links attached to the battery. One of them goes to the ECU. Read upon this thread: www.infamousnissan.com/forum/showthread.php?t=35558

[@danielmanahan692]

My mechanic says I have error code 55. which happens to be the code for no malfunction, and yet the engine light stays on. and so I get no diagnosis, and my car fails only the 25 mile smogcheck test this is for a 93 Nissan Hardbody truck 4 cyl

[@jp2code]

+Daniel Manahan Are you on www.InfamousNissan.com? I don't have smog check where I live, but a lot of guys on there do. Post on there what specific part of your smog test failed. I'd vote for an old O2 sensor or dirty MAF.

[@danielmanahan692]

+jp2code how much is it to replace that device? if the error code is 55 which is no malfunction, and yet I have a check engine line on, then it would seem that the box is defective what else could it be? at least that is the conclusion of the mechanic. and I hear these parts can't be found except in a junk yard.

[@jp2code]

+Daniel Manahan The ECM detects problems with sensors and such that it needs to operate. The Check Engine Light (CEL), on the other hand, seems to be there to ensure your truck's emissions are good (which yours are not). See this pic out of the service manual: i.imgur.com/NBfxzi0.png

[@danielmanahan692]

+jp2code so I don't understand. are you agreeing or disagreeing with the mechanic's opinion that the computer is bad? if it reads error code 55 which is no malfunction and the check engine light on the dashboard is lit when the car is running, what else could that mean? why would the computer not give an error code when the check engine light is on? I can't smog this because of the check engine light being on. it must be off. and yet there might not be any problem with the engine, just the computer, if I understand. the emissions problems are another thing, separate issue or else a code should show up.

[@jp2code]

+Daniel Manahan Sorry this took me so long. I don't have a smart phone, and I was out at work. I'm saying a faulty O2 sensor is what causes the CEL to turn on. It is emissions related. There is nothing wrong with your ECU.

[@rohanboswell537]

How do i pull the code on a 98 Ud truck.It wont shift past second gear.

[@jp2code]

Use a code reader. You truck is OBD2.

[@Jake-gz6pw]

You have to push the clutch in and move the stick to the 3rd gear position