Please help a newbie out. :)

lmills · Jun 14th, 2008, 05:45 PM

Hey guys,

Been having some problems with a truck I recently purchased. After doing a search on the forum for the problem I have, it pointed to the MAF sensor. Well, I tried pulling the sensor today and cleaned it with no luck. Afterward, I did some more searching and figured out how to read the codes.

Upon checking the codes I pulled up a

13
23
24

The truck will only rev to 3K rpms and acts like it is hitting a rev limiter. I want to go ahead and replace the MAF sensor since the symptoms are pointing in that direction, but at $250 I would prefer to know for sure that it is the problem.

Thanks in advance for any help

zanegrey · Jun 14th, 2008, 08:50 PM

you must not have read all the way thru it..read it all again..

so forget the 23 and 24 for the moment and replace the coolant sensor.

and restart engine check for performance and reread the codes.

leave the maf alone..

report back when finished..

end line..

Nissanpickup · Jun 14th, 2008, 10:42 PM

13 Engine Coolant Temperature Sensor.
23 Idle Switch.
24 Throttle Valve Switch.

**88pathoffroad** · Jun 14th, 2008, 11:33 PM

Yeah, sometimes the CTS will trigger several codes due to it running wrong because the temp switch is faulty. I'd try that first.

lmills · Jun 15th, 2008, 05:49 AM

Quote:

Originally Posted by zanegrey

you must not have read all the way thru it..read it all again..

so forget the 23 and 24 for the moment and replace the coolant sensor.

and restart engine check for performance and reread the codes.

leave the maf alone..

report back when finished..

end line..

Well, the problem I am having is that the instructions state that I should be able to turn the key to the on position then switch the ECU switch to the diagnostics position, wait till the LED's blink 3 times, then turn the switch off and that will put it into the 3rd mode which is self diagnosis. The problem is, as soon as I switch the diagnostics switch to the on position, the LED's start blinking the codes immediately.

The other thin is I have consulted the manual and also read the instructions on the board here for reading codes and it says I should have a ECU with a dial for the diagnostics switch, but I do not. I have just a normal on/off switch. I am not sure if that was something they did earlier on or not.

zanegrey · Jun 15th, 2008, 09:26 AM

if you got those first codes then you did it right..

replace the sensor aand read the codes

lmills · Jun 15th, 2008, 11:47 AM

OK, will do.

jkretzer · Jun 18th, 2008, 07:34 AM

hurry up and get that jewel on the road!

**88pathoffroad** · Jun 20th, 2008, 08:01 PM

Sorry...when I wrote that I should have modified it a little...

Quote:

How to pull ECU error codes for 87-95 Pathfinders and hardbody pickups:

The ECU is under your passenger's side seat. You can gain access to it by simply sliding the seat all the way forward and removing the plastic cover from the ECU. You can also remove the seat if you want, it makes access a little easier.

The VG30i ECU's have a tiny toggle switch on the side of the ECU with a small snap-in switch cover that must be utilized to select the diagnostic mode of the ECU. The 4-cylinder ECU and the VG30E ECU has a slotted switch that turns 1/4 or 1/2 turn clockwise and counterclockwise to do the same task.

I should have stated: some early 4-cyl HB ECU's have the switch as well. In any case it will have one or the other. I've added the info to the thread now.

lmills · Jun 26th, 2008, 09:25 PM

OK, I tried replacing the coolant sensor. It got rid of the 13 code. Now I still have the codes 23, 24 and a code 43 has popped up. The 43 was there once before, but seemed to be intermittent. Now, it is totally back. LOL

zanegrey · Jun 26th, 2008, 09:50 PM

does the problem remain??

take a look at the tps .
is it loose? check it's connection and clean the connection .
the reread the codes..

do not worry yet about the 23 and 24..

Nissanpickup · Jun 26th, 2008, 09:53 PM

code 43 is the tps (throttle position sensor) it is located on the throttle body on the opposite side of the butterfly valve i believe

OchnofConcrete · Jun 26th, 2008, 10:28 PM

might need another throttle body. sensors can be replaced but.. yeah.. anyone got that?

you said you cleaned the MAF... how? you clean the TPS?

lmills · Jun 27th, 2008, 08:44 PM

Quote:

Originally Posted by zanegrey

does the problem remain??

take a look at the tps .
is it loose? check it's connection and clean the connection .
the reread the codes..

do not worry yet about the 23 and 24..

yeh, the problem is still there. It appears to go into limp mode or something and will not rev over about 2700 RPM and the exhaust smells very rich.

as for the MAF sensor, I cleaned it with a cotton swab and alcohol like I read here in the forums

zanegrey · Jun 27th, 2008, 10:41 PM

b4 you do n e thing else check the secondary coil for cracks and spark...

if the coil is good then concentrate on the tps..