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Intake air control valve?

Tiny
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Honestly, I have no idea of such a sensor. The computer receives a signal from the ECT (engine coolant temperature) sensor. To the best of my knowledge, there isn't a different one to shut the engine down under these conditions.
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Wednesday, February 12th, 2020 AT 7:11 PM
Tiny
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You may be correct on that, I've been hunting for that in the Nissan service manual for it but I think one time I read something about what I mentioned and it said that a regular diagnostic scanner will not find it but Nissan's Consult can find it. If I find that, will send it to you. Thanks
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Wednesday, February 12th, 2020 AT 7:20 PM
Tiny
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Sorry I couldn't help with that one. However, if you do, I would be really interested in knowing about it.

Take care,
Joe
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Wednesday, February 12th, 2020 AT 8:06 PM
Tiny
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On page EC 300 in the Nissan service manual it talks about overheating maybe I understood it wrong in my memory, I tried to copy ( EC 300 ) and send to you but it wouldn't allow me to.
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Wednesday, February 12th, 2020 AT 8:31 PM
Tiny
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DTC 1900 is the code.
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Wednesday, February 12th, 2020 AT 8:55 PM
Tiny
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That code is related to the ECT. See the attached.

Joe
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Wednesday, February 12th, 2020 AT 9:21 PM
Tiny
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Okay, thanks.
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Thursday, February 13th, 2020 AT 5:28 AM
Tiny
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Not a problem. If you need info on its replacement, let me know.

Take care,
Joe
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Thursday, February 13th, 2020 AT 7:10 PM
Tiny
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They sent me the return shipping label for one on truck and a tracking no. For the other one on the way, it will probably a week or so before I get it on, depends how log it takes to get the one they are sending, I'll holler back at you. Thanks
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Thursday, February 13th, 2020 AT 7:46 PM
Tiny
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Sounds like a plan. Take care and let me know.

Joe
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Friday, February 14th, 2020 AT 2:53 PM
Tiny
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Joe, the charging voltage was dropping down to 12.3, 12.2 and sometimes down to 12.9 volts with the fan going and the park lights on so I changed the alternator today and it's charging like it should around 14 volts with the headlights on and the fan going. Another thing I done today is I used 2 jumper wires at the connector where the IACV plugs into the plug in and monitored the voltage (0 - 7 volts at 2,000 rpm's) and it seemed to be correct with what the Nissan Service manual recommended and I done this before installing the alternator. I will try my truck out tonight and see what happens, let you know the results later. I'm thinking it might be possible that it wasn't charging good enough to keep everything working correctly. Thanks
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Friday, February 14th, 2020 AT 3:36 PM
Tiny
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Absolutely that can cause a problem. If voltage is low, it can cause all kinds of issues. Let me know. I hope that took care of the issue.

Joe
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Friday, February 14th, 2020 AT 7:54 PM
Tiny
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I have driven it and it still tried to quit on me one time but it's running a little better, maybe when I install that other IACV that will help solve the problem but this alternator is keeping voltage at 14 volts while the headlights are on and the heater fan is going. Sometimes when it was quitting, it was like I just turned to key off or it just lost all the power to the ignition, I didn't have time to hit the gas pedal to keep it going, a few other times it would flood out so bad that pressing the gas pedal didn't help and it quit. Will let you know the results. Thanks
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Friday, February 14th, 2020 AT 8:13 PM
Tiny
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In a prior email I sent right before the last one I made a mistake when I said it was charging at 12.9 volts, it was allowing the voltage to drop to 11.9 volts sometimes even while I was driving it but that's when the charging should be putting out the best charge.
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Friday, February 14th, 2020 AT 8:30 PM
Tiny
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I noticed that. I just assumed it was a typo.
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Friday, February 14th, 2020 AT 8:46 PM
Tiny
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I've replaced the ECT sensor plus I bypassed the plugin for the IACV and directly plugged the wires in to the plug in and my truck is flooding out so bad it will not run on it's own without me giving it some throttle. It was flooding before I bypassed the plugin. I should get the new IACV tomorrow, not sure if I can get it on since it's going to rain. Yesterday I unplugged the IACV plugin ( while it was running to see what would happen ) and later when I checked the codes it had p0505 & p0100 ( mass air flow sensor ). I erased both of those codes and it has no check engine light on now.
Can the mass air flow sensor be bad and not give a code all the time or do you know?
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Monday, February 17th, 2020 AT 3:31 PM
Tiny
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Hi,

I would think it would throw a code. However, if it is dirty, that can cause issues. Have you tried cleaning it? The 505 is related to the IACV again. If the MAF is bad, it can be causing this. Here are the directions for testing the IACV. The two attached pics correlate with the directions.

____________________________________

1997 Nissan-Datsun Truck D21 Hardbody SE King Cab 2WD L4-2389cc 2.4L SOHC MFI (KA24E)
Component Testing Procedure
Vehicle Powertrain Management Fuel Delivery and Air Induction Sensors and Switches - Fuel Delivery and Air Induction Air Flow Meter/Sensor Testing and Inspection Component Tests and General Diagnostics Component Testing Procedure
COMPONENT TESTING PROCEDURE
COMPONENT INSPECTION
Mass Air Flow Sensor
1. Turn ignition switch "ON".
2. Start engine and warm it up sufficiently.

Pic 1

3. Check voltage between terminal 1 and ground.

Conditions / Voltage, V
Ignition switch "ON" (Engine stopped.) / Less than 1.0
Idle (Engine is warmed-up sufficiently.) / 1.3 - 1.7
2,500 rpm / 1.7 - 2.3
Idle to about 4,000 rpm / 1.3 - 1.7 to Approx. 4.0

*: Check for linear voltage rise in response to increases to about 4,000 rpm in engine speed.

Pic 2

4. If NG, remove mass air flow sensor from air duct. Check hot wire for damage or dust.

Let me know if that helps.

Joe
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Monday, February 17th, 2020 AT 6:27 PM
Tiny
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What is the best cleaner for that MAF sensor that you know of?
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Monday, February 17th, 2020 AT 7:18 PM
Tiny
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Honestly, there really isn't one brand that sticks out. Whatever they have at the parts store has always worked. You may want to try the test if you get the chance as well.

I don't know if you want it, but here is a link that explains how it is done:

https://www.2carpros.com/articles/mass-air-flow-service

Let me know the results.

Joe
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Monday, February 17th, 2020 AT 7:20 PM
Tiny
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Okay, I will.
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Monday, February 17th, 2020 AT 7:41 PM

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