ok....working on my nephews car....95 Maxima with the 2 crank position sensors. He brings it to me with a check engine light on and she is hard to start. She'll roll over for several seconds, kick back, continue to roll over then finally start. Checked the PCM and got an 0407 code (crankshaft position sensor REF) pulled it. it ohmed out to 535 ohms but I couldn't get a voltage spike after passing a screwdriver past it....replaced it anyways seeing how I had good ground through the harness. Same problem remains and my nephew is now $50 poorer....(poor kid)

Any ideas anyone?

Thanks..
Mike

ok....working on my nephews car....95 Maxima with the 2 crank position sensors. He brings it to me with a check engine light on and she is hard to start. She'll roll over for several seconds, kick back, continue to roll over then finally start. Checked the PCM and got an 0407 code (crankshaft position sensor REF) pulled it. it ohmed out to 535 ohms but I couldn't get a voltage spike after passing a screwdriver past it....replaced it anyways seeing how I had good ground through the harness. Same problem remains and my nephew is now $50 poorer....(poor kid)

Any ideas anyone?

Thanks..
Mike

MAF ... tst unplug and try to start. [will have 2k rpm limit]

so you are saying that if it will start easily with the MAF unplugged then I need to replace the MAF sensor?

so you are saying that if it will start easily with the MAF unplugged then I need to replace the MAF sensor?

Yes. U can also tst output with dmm - see p9, linky below

ok. with the MAF sensor unplugged the condition remains. Now I'm getting an 0101 code which is either an O2 circuit fault or a cam position sensor fault. I'm thinking timing chain problem. What gets me is the car still runs fine once you get it started. Any thoughts?

Also, if it is the timing chain, how difficult is this one to change. As I understand this engine actually has 3 chains. I'm a lil skeerd.

mike

ok. with the MAF sensor unplugged the condition remains. Now I'm getting an 0101 code which is either an O2 circuit fault or a cam position sensor fault. I'm thinking timing chain problem. What gets me is the car still runs fine once you get it started. Any thoughts?

Also, if it is the timing chain, how difficult is this one to change. As I understand this engine actually has 3 chains. I'm a lil skeerd.

mike

Check charge voltage while running and batt & voltage at startup.

0101 is campos. Does that signal really arrive to ECU?

O2 is ignored first "five" minutes - until engine has warmed up. Check its signal at ECU at 1500rpm, warm: fluctuatin 0-1V. Also check the self tst.

Test also TPS, included in A/T diagnostics pass.

Chain stays the same on startup and later...

P0101 is for the mass air-flow sensor. you know the one you told him to unplug. is the car hard to start at all times? does the code always set at first cranking? can you hook a scope up to it and monitor the signal?

P0101 is for the mass air-flow sensor. ...

To get things complicated:

P0101 -or- 0101 Camshaft position sensor doesnt even exist on -95 FSM...

Here some Selected fault codes from FSM for -95 MAxima, read FSM EC-65 and forward.

MIL 11 = P0340 Campos sensor

MIL 12 = P0100 Air Flow Meter/Mass Air Flow Sensor.

MIL 101 = P0155 Front Heated Oxygen Sensor Heater Circuit right hand bank.



MIL: Nissan code
0100: SAE code
P0100: Nissan Consult (tester) display

Here's one MIL-compilation: http://www.cardomain.com/ride/748507/21

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ok, so unplugging the MAF is what generated the 0101 code. funny. the manual said that was campos sensor.....

She'll roll over for several seconds, kick back, continue to roll over then finally start.

Mike

You need to add a couple of ground wires.

Refer to this thread below...


http://forums.maxima.org/showthread.php?t=338918

added ground wires but to no avail. Threw a starter at it and fixed it! I have never seen a starter fail like that before. I guess there is a first time for everything though. Thanks for all your help guys.