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Forum: 4th Generation Maxima (1995-1999)
05-31-2013, 06:17 PM
Replies: 1
Views: 6,086
Posted By ATTappman

Sample scope waveforms

Here's some waveforms for the major sensors and an injector and coil on a 97 Maxima, measured using a Picoscope. All the sensors are good. In case you wonder what's going on under the hood. Sorry for...
Forum: 4th Generation Maxima (1995-1999)
05-11-2013, 01:49 PM
Replies: 15
Views: 37,468
Posted By ATTappman

http://www.nicoclub.com/FSM/Maxima/

http://www.nicoclub.com/FSM/Maxima/
Forum: 4th Generation Maxima (1995-1999)
01-15-2013, 07:21 PM
Replies: 8
Views: 5,774
Posted By ATTappman

Wouldn't you want to check the ignition coil on...

Wouldn't you want to check the ignition coil on that cylinder before condemning the injector?
Forum: 4th Generation Maxima (1995-1999)
01-15-2013, 03:48 PM
Replies: 3
Views: 2,454
Posted By ATTappman

Here's what the one on my car does: with the...

Here's what the one on my car does: with the vacuum pump on the black nipple and a vacuum gauge on the white nipple, I can pull a vacuum on the gauge attached to the white side by pumping the pump....
Forum: 4th Generation Maxima (1995-1999)
12-19-2012, 08:04 PM
Replies: 22
Views: 4,092
Posted By ATTappman

Never thought of looking for the fittings at...

Never thought of looking for the fittings at Autozone. Over by where they have fuel and vacuum hoses I guess. Thanks for the tip.
Forum: 4th Generation Maxima (1995-1999)
12-11-2012, 07:00 PM
Replies: 22
Views: 4,092
Posted By ATTappman

That's good to know. I guess this particular way...

That's good to know. I guess this particular way of failing wasn't anticipated by the developers of the ECM code, so it got somewhat misidentified.

I wanted to do the same vacuum test you...
Forum: 4th Generation Maxima (1995-1999)
12-07-2012, 07:35 AM
Replies: 6
Views: 12,318
Posted By ATTappman

It's used by the ECM to monitor the function of...

It's used by the ECM to monitor the function of the EGR system. When the EGR valve opens and exhaust gas flows past the temperature sensor, it signals the ECM that the EGR valve is working. The...
Forum: 4th Generation Maxima (1995-1999)
12-05-2012, 11:31 AM
Replies: 22
Views: 4,092
Posted By ATTappman

Come to think of it I don't think there's...

Come to think of it I don't think there's anything wrong with the ground, since you measured a low voltage out of the solenoid. Anyway I looked at the FSM and the ECM is grounded through the engine...
Forum: 4th Generation Maxima (1995-1999)
12-04-2012, 07:36 PM
Replies: 22
Views: 4,092
Posted By ATTappman

The ECM stores a handful of parameters when it...

The ECM stores a handful of parameters when it sets a DTC. Engine load, vehicle speed, fuel trims, and a few other things I can't remember. You can retrieve the freeze frame data with a scan tool,...
Forum: 4th Generation Maxima (1995-1999)
12-03-2012, 07:24 PM
Replies: 22
Views: 4,092
Posted By ATTappman

When you clear the code, does it get set again...

When you clear the code, does it get set again immediately? Does the freeze frame data always look the same? Wondering if the fault is intermittent or constant.

When all else fails, check grounds....
Forum: 4th Generation Maxima (1995-1999)
12-02-2012, 05:55 PM
Replies: 22
Views: 4,092
Posted By ATTappman

It looks to me like the EVAP solenoid is...

It looks to me like the EVAP solenoid is confirmed good by your diagnostics. But it seems like the purge control valve (the black hat valve) might be failing. Did you test that valve off the car?...
Forum: 4th Generation Maxima (1995-1999)
11-29-2012, 04:11 PM
Replies: 22
Views: 4,092
Posted By ATTappman

I checked the voltage on the ground wire at the...

I checked the voltage on the ground wire at the solenoid, and it's 315 mV when the engine is warmed up and idling above 2,000 rpm. Below 2,000 rpm, it will be close to the charging system voltage....
Forum: 4th Generation Maxima (1995-1999)
11-29-2012, 04:08 PM
Replies: 7
Views: 1,874
Posted By ATTappman

Why would that be caused by the fuel pressure...

Why would that be caused by the fuel pressure regulator? Is it leaking? To replace it, relieve the fuel pressure and then just remove it. Those two screws will be a challenge.
Forum: 4th Generation Maxima (1995-1999)
11-29-2012, 04:01 PM
Replies: 10
Views: 1,475
Posted By ATTappman

Holy parts changing! That's the DTC for the...

Holy parts changing! That's the DTC for the camshaft position sensor. After replacing it, did you measure the voltage on the signal wire, to see if it's pulsing like it should when cranking the...
Forum: 4th Generation Maxima (1995-1999)
11-28-2012, 04:11 PM
Replies: 10
Views: 877
Posted By ATTappman

Current flows from the battery, through fuse 57,...

Current flows from the battery, through fuse 57, through the connector to the relay box, then through the relay to the ECM. Page EC-99 in the FSM.

If a rat gnawed the insulation off wires and the...
Forum: 4th Generation Maxima (1995-1999)
11-28-2012, 03:46 PM
Replies: 22
Views: 4,092
Posted By ATTappman

The ECM actuates the EVAP solenoid when engine...

The ECM actuates the EVAP solenoid when engine rpm is above 2,000 and steady. It might also do it when the rpm is lower than 2,000 but the car is moving. I don't think the EVAP monitor running or not...
Forum: 4th Generation Maxima (1995-1999)
11-28-2012, 03:33 PM
Replies: 22
Views: 4,092
Posted By ATTappman

I just measured the voltage drop across the EVAP...

I just measured the voltage drop across the EVAP solenoid by backprobing the two wires entering the solenoid's connector. With key on engine off, there's battery voltage on both wires. Same when the...
Forum: 4th Generation Maxima (1995-1999)
11-27-2012, 05:30 PM
Replies: 22
Views: 4,092
Posted By ATTappman

By backprobing the wire where it enters the ECM...

By backprobing the wire where it enters the ECM connector, on the back of the ECM. But I don't know what "improper" means in this case, because I don't know what it's expecting to see. It might be...
Forum: 4th Generation Maxima (1995-1999)
11-26-2012, 07:26 PM
Replies: 22
Views: 4,092
Posted By ATTappman

Do you mean P0443? That code applies to both the...

Do you mean P0443? That code applies to both the EVAP canister purge control valve and the purge control solenoid valve. Those are two separate parts. If the solenoid valve tested good, you have to...
Forum: 4th Generation Maxima (1995-1999)
10-04-2012, 12:04 PM
Replies: 19
Views: 1,232
Posted By ATTappman

When you pull the hose off the barb on the UIM,...

When you pull the hose off the barb on the UIM, you have to be able to hold the UIM in place while pulling on the hose or working it back and forth. This is hard to do with the UIM unbolted. You pull...
Forum: 4th Generation Maxima (1995-1999)
09-14-2012, 07:57 AM
Replies: 92
Views: 4,579
Posted By ATTappman

40,000 miles on both driver and passenger side....

40,000 miles on both driver and passenger side. No issues. They don't vibrate. They don't suck. Auto, non-LSD, no ABS.
Forum: 4th Generation Maxima (1995-1999)
07-09-2012, 11:09 AM
Replies: 14
Views: 1,647
Posted By ATTappman

If you haven't already, check the oil level. The...

If you haven't already, check the oil level. The timing chain will rattle if the oil level is too low.
Forum: 4th Generation Maxima (1995-1999)
07-01-2012, 01:57 PM
Replies: 15
Views: 1,216
Posted By ATTappman

That is the garter spring for the seal. You are...

That is the garter spring for the seal. You are right about where it originally was placed. Once it comes off, it's stretched and it won't stay on if you try to put it back. So yes, you need a new...
Forum: 4th Generation Maxima (1995-1999)
06-30-2012, 06:39 PM
Replies: 15
Views: 1,216
Posted By ATTappman

Yikes, yes, you have to make sure the splines...

Yikes, yes, you have to make sure the splines line up first, but that will be easy to do right and obvious if you do it wrong. Then push it in as far as you can, and hammer it the rest of the way....
Forum: 4th Generation Maxima (1995-1999)
06-30-2012, 03:45 PM
Replies: 15
Views: 1,216
Posted By ATTappman

Every time I remove and replace the driver's side...

Every time I remove and replace the driver's side axle I have to hammer it back in with a 3 lb dead blow hammer and a piece of 2x4.

I've always assumed that shroud you're talking about is a...
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