97 nissan altima 2.5 runs bad-rich
- mobileauto
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at the start it had several codes P0505 iac
p0135 b1s1
p0141 b1s2
p0400 and p1400 both for egr
when I clear the codes 3 come back instantly, p0135, p0141 and p0505, even tho all appears normal. the next thing is before I got this car it had a whole list of things replaced plugs, wires, fuel filter, fuel pump, intake gasket, iac motor, #4 injector and the front 02 sensor.
I spent quite abit of time with this and could find no direction.
I am hoping someone can point me in a direction of something to look at or what I am not seeing
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- Desmond6004
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If that P0135 is coming back right away check your O2 sensors for resistance - of the 4 wires 2 should be the same colour and have a low-ish resistance like 4 - 12 ohms or something like that. Otherwise some vehicles have separate fuses for the O2 sensor heaters - check there are no blown fuses and make sure there are fuses everywhere they should be - sometimes people 'borrow' fuses from another slot when they pop their cigarette lighter fuse plugging something in wrong.
Getting involved in discussions because I have a lot to learn still.
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- mobileauto
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So what I tell my students is everything is cause and effect. Powers and grounds!
With that said I see that the o2 codes are for bad heater circuits, i would test the circuit with a test light and see if the heater circuit works. un plug the O2 and put your test light in the circuit turn on the key and it should turn on and it may flash and go off , if it does that's good you have a bad O2 . If it does not light see if you have power on one leg but use a good ground if it works you have a bad ground. if not you need to check at the PCM and test. if it works you have a bad wire going to the O2 .
Good luck
Doc
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- mobileauto
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Sent from my Moto E (4) Plus using Tapatalk
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- mobileauto
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when you cant throttle it the maf if fixed at 1.6 mv and both o2 sensors are at 30mv and stuck there, this does idle in open loop by design. I can unplug the maf and instantly it will throttle fine until about half throttle and it acts like a rev limiter-hook the maf back up and it runs perfect just like it is supposed to for a time then the same thing all over again. the maf is a new, not reman, delphi unit.
I have checked the ground on the maf along with the 12v source and signal, it all looks fine, sorry for the long post but I need some direction, feeling really stupid at this point.
thanks for any help and direction
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Nissan Throttle Body Relearn Procedure
1) Perform the Accelerator Pedal Released Learning procedure. This procedure tells the ECU what voltages to expect when your foot is off the pedal
Foot is off the accelerator pedal
Turn ignition switch ON and wait at least 2 seconds
Turn ignition switch OFF and wait at least 10 seconds
Turn ignition switch ON and wait at least 2 seconds
Turn ignition switch OFF and wait at least 10 seconds.
2) Perform the Throttle Valve Closed Position Learning Procedure
Foot off the accelerator pedal
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds
During the last 10-second period, listen to the throttle body to make sure you hear it moving.
3) Start the engine and let it run under the temp gauge is in the normal range.
4) Turn ignition switch OFF and wait at least 10 seconds.
5) With your foot off the accelerator pedal, turn the ignition switch ON and wait 3 seconds.
6) Then perform this procedure with the engine off, key in ON position.
Repeat the following procedure quickly five times within 5 seconds.
Fully depress the accelerator pedal
Fully release the accelerator pedal.
7) Wait 7 seconds, fully depress the accelerator pedal and keep it down for approx. 20 seconds until the MIL stops blinking and turned ON.
Fully release the accelerator pedal within 3 seconds after the MIL turned ON.
9) Start engine and let it idle.
10) Wait 20 seconds.
11) Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications.
Idle speed = 650 ± 50 rpm (in P or N position)
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If it's reading a rational value (usually, around 1.5V at idle for Nissan), then there's an open in the signal wire somewhere. If it agrees with the data PID, either the MAF is failing, signal wire is shorting or there's a power/ground problem to the MAF.
Either way, you may be disturbing whatever the problem is by unplugging the MAF.
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