HELP! My car goes into safe mode randomly.

[thew]

My car will go into safe mode randomly. It usually doesn't last for more than a minute. It happens almost everytime I drive. It idles high(around 1500-2000rpm) and surges also. I have replaced air filter, feul filter, maf, plugs, wires, cap and rotor. The ecm says its the tps but that's new and I set it right already. Does anybody know what else I should test?

[onosqv]

How do you know it's going into safe mode? What is exactly happening when it does this.

[thew]

It won't let me rev over about 2500rpm. I had a friend that knew a lot about cars drive it and he told me. It also hesitates at 2500rpm everytime.

[onosqv]

That's easy, it's your MAF sensor or MAF connection. The ECU will go into 2500rpm safe mode when it doesn't receive a maf signal.

So either check for corrosion on the connector, clean the maf sensor, or replace w/ a known good one.

Good luck.

[thew]

I have replaced the maf and there is no corrosion on the connection. When I put the new maf in the problem went away for about a week then came back. It continously gets worse.

[ricebike]

did u pull any trouble codes from the ECU/ECM?

oops, i mean did u reset the car's pc then see if it's still the tps problem? did u set it correctly?

[onosqv]

Ok, to verify, you are going to need 2 ppl (unless you have a SAFC).

Someone needs to probe the maf signal on the ecu while u drive.

From what you are saying, you are only getting limited to 2500rpm sometimes??? Or every single time in every single gear?

If every time in every single gear during a particular drive, it is the MAF not sending signal or the ECU not receiving the signal.

If it is only once in a while, you should still check to make sure you are getting MAF signal at the moment. Also, verify your TPS & timing.

Are you following FSM instructions? They have specific troubleshooting procedures for when this happens.

Without us being there, we only have your description to go off, and from what you are providing, that's all I can come up with.

[thew]

It hesistates at 2500rpm everytime but only goes into safemode sometimes. The code I got from the ecu was for the tps. I checked it and it was working right. The repair manual said that the tps circut is open or shorted. How am I suppose to check this? I checked the maf and the voltage was a little low. I just bought the maf from a junk yard. I assumed that it worked. How am I suppose to know if the maf or the maf circut is the problem if I don't get a brand new one. Now that I reset the ecu it ran better but I'm sure my problem will come back. It still surges but doesn't go up to 2000rmp right now.

[ricebike]

don't assume anything... well, because...

make sure that MAFs is ok... i don't have my FSM on my pc @ the moment, but i believe u can do an ohm test to the disconnected sensor for continuity. check the wire inside the MAF for any gunk/ oil that's on it,

there's a FSM procedure to back-probe test it w/ it plugged in... as broke partially stated...

double check that setting f the tps as well... u got the FSM, right?

free FSM thread

Quote » The repair manual said that the tps circut is open or shorted. How am I suppose to check this?[/quote]wif a voltmeter again... i suck @ electrical, so i'll let some1 else chime in

[onosqv]

It hesistates at 2500rpm everytime but only goes into safemode sometimes.

I'm sorry, I'm not understanding you very well.

What do you mean by "hesitates @ 2500 rpm" - will it go past 2500 rpm or will it stutter/bog, but eventually go past it?

"only goes into safemode sometimes" - what is your definition/view of safe mode?

If you are saying hesitates @ 2500 as in not go over, and safemode as in "rev limiting" - you are essentially talking about the same thing - this is safemode 100% of the time.

If not, please clarify.

An easy test - do you get stuck @ 2500 (i.e. NEVER EVER be able to past 2500) in any gear? how about neutral? Or can you go to say, 6500 rpm in neutral?

[rsmithdrift]

To me it sounds like it always surges/bogs at 2500 rpm but occasionally it will rev limit there, ie, safe mode. If I were to explain this that is how I would do it.

[180fan]

I got my money on the MAFS plug.

[thew]

It does bog at 2500rpm for only a second then occasionally will rev limit at 2500rpm. When it has the rev limit and I put it in neutral it still has the rev limit. It just goes away like when I'm driving regular. I've never tried to go to 6500rpm in neutral but after it gets out of the rev limit it seems like I wouldn't have any problems doing that. What do I use to open the FSM winzip? Do you have instructions? I've never used winzip before.

[thew]

If I was going to get a another maf plug could I get one off a sohc if mine is a dohc. I think that is all they have at the junkyard close by my house. Would it still work or would I need one off a dohc. The nissan dealership said if I wanted a new plug then I would need a number off a white tag on the plug. I think he wanted a part number so if anyone has the part number for a maf plug I would appreciate it thanks.

[Masood]

Recently, I experienced similar issues with my 2006 Nissan Tida. It turns out that when washing my car with high-pressure water, the water was entering the engine compartment through gaps in the hood. This water then reached the ECU cables. Due to the age of my car, the protective covering in my ECU model couldn't prevent the water from reaching the ECU pins. Thankfully, I discovered this issue, cleaned the cables, and after erasing the codes, my car is running perfectly now.