Question about 1996 Nissan Altima

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TPS Problem I had a TPS code at the mechanic. The mechanic put in a new TPS and the problem stayed the same. I put in a new ECU and the problem stayed the same. I'm playing mechanic myself now and here is what I have. I disconnected the TPS connector and tested the power at 5v, the reference at 4.7v, and the ground wire is fine. I believe the reference voltage is only supposed to be .5v , but I don't know anything about this stuff. The reference wire is giving me a reading for wide open throttle when it isn't connected to the tps. Should I be getting .5 with it disconnected on the ref wire? I've already tried 2 ECU and the voltage stays the same. Could a bad wire give me more voltage??

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Maybe water in fuel

Posted on Nov 23, 2013

4 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 1997 Nissan Quest TPS sensor

2001 nissan quest with new tps but still has P0120,P0325,P1705 codes

Posted on Nov 16, 2010

jayhawke
  • 338 Answers

SOURCE: I have a 1988 Nissan

does the engine rev higher when hot and not in gear? if it doesn't try changing fuel filter and spraying carb cleaner into intake when running

Posted on May 11, 2011

  • 90 Answers

SOURCE: Car intermittently dies, uneven throttle, computer not reporting correctly

I had a similar problem with my 280 Datsun. It turned out to be the fuel pressure sensor located near the fuel injectors. Some of them come with a vacuum hose attached.

Posted on Nov 21, 2013

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Mechanics advised that gearbox needs replace after diagnostic Of codes . Dash light still on after codes being read , have had ecu replaced 2yrs ago ? What do you think it could be , thanks phil


didnt specify vehicle --generic answer--until repair is made the vehicle will show engine light and have codes --if gearbox is problem for limp mode /until repairs are made or gearbox replaced you will be in limp mode --and as to sensor find out what one it was --start problem may show back up if sensor was problem --and GET a 3rd opinion you have 2 mechanics with different opinions on your problem and i guess they are reading your trouble codes differently

Sep 20, 2016 | Cars & Trucks

1 Answer

My name Ilsur, I of Tatarstan , I have a jeep Grand cherokee WJ laredo 1999 4.0 error P0123 I replaced TPS but nothing helps, replaced the clockspring does not help, help me please


i had the same car.... what mileage.... 200K?
TPS errors. (its real its a real measured error)
this error is catastrophic, , meaning, not just a tad off,
the FSM covers this in details.
clock spring, the Air bag clock spring? has nothing to do with this.
or do you meant the throttle return spring, (my guess?)
the TPS output pin was discovered to have an illegal high voltage
on the output (you can be sure it idid)
spec:
TP Sensor indicated more than 4.50v for 700 ms.

caused by a bad TPS ground wire, or the output pin cut.
or the TPS internals are cracked in half (bad inside) (i have photos)
its bad TPS or bad wires to it. simple huh?
it will not be a bad ECU. as is on the list; it will not.
The jeep has great cheap TPS to buy ofter market,
on other cars not, and can cost $300 , for them
i connect my potable scope and watch the TPS output while i drive.
and find out if it is really truly bad.... hell the part, costs more than my
scope.!
be happy its not new car with throttle by wire, !!!
or the big V8 , whole new throttle body for $1000

recap. bad TPS, bad wires.

the tps on most cars are calibrated.
if you just thrown on a new TPS and not calibrate it, that is
a big failure.
here are the steps
1 key off
2 remove TPS.
3: put back new.
4:
The TPS is mounted to the throttle body. The throttle shaft end of throttle body slides into a socket in the TPS. The TPS must be installed so that it can be rotated a few degrees. (If sensor will not rotate, install sensor with throttle shaft on other side of socket tangs). The TPS will be under slight tension when rotated.
  1. Install TPS and retaining screws.
  2. Tighten screws to 7 Nm (60 inch lbs.) torque.
  3. Connect TPS electrical connector to TPS.
  4. Manually operate throttle (by hand) to check for any TPS binding before starting engine.

adjust the TPS for
0.26 volts at minimum throttle opening (idle)

worst case:
the FSM says it auto calibates
if the new TPS errors,. set it to 1/4 volt at idle.
reset ECU , all DCTs using scan tool
pull battery for 5min neg. lug (backup radio codes first)
put back lug
start engine, drive 25miles or till CEL comes on (failures)



Nov 23, 2013 | 1999 Jeep Cherokee

1 Answer

Car intermittently dies, uneven throttle, computer not reporting correctly


I had a similar problem with my 280 Datsun. It turned out to be the fuel pressure sensor located near the fuel injectors. Some of them come with a vacuum hose attached.

Nov 20, 2013 | 1996 Nissan Altima

1 Answer

I need a honda car code , i can't turn on my radio


service manual.
Code Description Possible Cause
0 ECU / ECU signal No signal to ECU
1 Oxygen sensor circuit Oxygen sensor or circuit, ECU
2 Oxygen sensor circuit Oxygen sensor or circuit, ECU
3 MAP sensor circuit Map sensor circuit
4 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
sensor
5 MAP sensor circuit MAP sensor or circuit, mechanical
problem
6 ECT sensor circuit ECT sensor or circuit, automatic
transaxle control unit
7 TPS / Angle Sensor TPS sensor or circuit, automatic
transaxle control unit
8 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
sensor
9 CMP sensor CMP sensor or circuit
10 IAT sensor IAT sensor or circuit
11 Idle Mixture Adjuster Sensor Idle mixture adjuster sensor or
circuit
12 EGR system fault No EGR action, faulty EGR valve
13 BARO sensor circuit BARO sensor or circuit
14 Idle Air Control valve circuit / ECU Open or shorted out ignition signal
circuit / No signal to ECU
15 Ignition Output signal Open or shorted ignition output
signal circuit
16 Fuel Injector Circuit Open or shorted fuel injector
circuit
17 VSS circuit VSS sensor or circuit
18 Ignition Timing Adjuster Open or shorted signal circuit
19 A/T Lock-up control solenoid Open or shorted signal circuit,
Lock-up control solenoid lock-up solenoid
20 Electrical Load Detector / Sensor Electrical load detector or circuit
Honda/Acura
Fault Code Definitions (21 - 59)
Chapter 3 22
Code Description Possible Cause
21 Spool Solenoid Valve Open or shorted signal circuit,
spool solenoid valve
22 Valve Timing Electronic Oil Open or shorted signal circuit,
pressure switch valve timing oil pressure switch
23 Knock sensor circuit Knock sensor or circuit
30 AT / ECU communication signal A AT control unit, ECU
31 AT / ECU communication signal B AT control unit, ECU
35 Traction control / ECU / signal Traction control module, ECU
36 Traction control / ECU / signal Traction control module, ECU
41 Oxygen sensor heater - left side Oxygen sensor / heater or circuit
42 Oxygen sensor heater - right side Oxygen sensor / heater or circuit
43 Fuel Supply system - left side Oxygen sensor or circuit, fuel
system
44 Fuel Supply system - right side Oxygen sensor or circuit, fuel
system
45 Fuel metering - left side Injector control circuit, incorrect
fuel metering
46 Fuel metering - right side Injector control circuit, incorrect
fuel metering
48 Heated oxygen sensor Oxygen sensor or circuit
53 Right Knock Sensor Right knock sensor or circuit
54 CKP sensor 2 CKP sensor 2 or circuit
59 CMP sensor 2 CMP sensor 2 or circuit

Dec 28, 2010 | 1994 Honda Accord

1 Answer

Failed emission test, codes p1698, p1776, p0700. It is a 1999 Plymouth Grand Voyager, 3 liter


Strange that it failed the emission test. The codes given relate to the transmission computer not outputting the correct signals to the engine (power) control module ECU. Have you noticed any abrupt gear shifts lately? I wonder if the emission test failure is related. Sometimes the gear selection failure can be as result of the ECU getting the incorrect information from a faulty throttle position sensor TPS. The ECU relays the information to the transmission controller and this snatches at the gear shift at slightly the wrong time. A faulty TPS might also be responsible for the ECU setting the wrong fuel air mixture and this would result in inappropriate exhaust gas emission. The TPS is on the throttle plate shaft and is located on the outside of the throttle body. The two outer pins on the TPS plug have 0 volts and 5 volts. The middle pin sends the voltage to the ECU according to the throttle shaft position between 0 to 5 volts. Check out the TPS thoroughly before looking for something more complicated. Then next I would pull the sockets from the respective control units and make sure all the contact pins are clean and bright to ensure good inter connection

Aug 24, 2010 | Plymouth Grand Voyager Cars & Trucks

2 Answers

2001 Elantra stall, loss of power. Driving at 40-50km/hr or on idle, cutting out, hicupping on occasions. Intermittent check engine light (on then off) for short duration, no code registers, RPMs drop down...


I am having the exact same problem with my 2001 Hyundai Elantra. I was told that the engine code that comes up when the sensor is on is called "Absolute Pressure In The Manifold". I was told by a "Hyundai Specialist" that when that code comes up it usually means that the seal on the manifold is Fuct. When my mechanic checked that out for me he had noticed that my manifold had 4 cracks in it(can varify cause he showed me). He replaced the manifold and gasket. The car ran fine for about 2-3 days and since then the problem has since come back and my check engine light will no longer go on/off it only stays on. Because of the check engine light always staying on I have noticed that on many occasions my car will hiccup many times in a row. The only way to stop the hiccup I have noticed is to take my foot right of the gas for approx. 2-3 sec then car will continue without hiccup(till it happends all over again). All in all I have been having this problem now for approx. 1 year and if there is somehow someway it could be repaired I would appretiate it.

Oct 17, 2009 | 2001 Hyundai Elantra

2 Answers

Car stalling


Did the 'Check Engine' Light come ON? Whenever the 'CHECK ENGINE' light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on. You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code which have been stored in the ECU computer. Afterward, we might be able to help you DIAGNOSE and perhaps eventually fix the problem.
NOTE: Commonly, the throttle position sensor (TPS)can cause the symptom you describe without turning on the CHECK ENGINE light. The TPS is a simple dash-pot (potentiometer) which can develop problems with age/time. Recommend you find a mechanic/ electrician who knows how to test it for bad spots -- if they find any, replace it.

Oct 12, 2009 | 2001 Hyundai Elantra

1 Answer

HELP!!!! 91 LS400 ERRATIC IDLING


bad computer. had the same problem sent mine to auto computer exchange in Davie Fl. they reprogramed it . The problem is gone.

Jun 22, 2009 | 1992 Lexus Ls 400

3 Answers

Jag xj8 3.2 v8 charge light staying on


try putting your vehicle on a diagnostic check although you have changed the alternator the ECU ( car computer ) may still think that the alternator is still faulty a diagnostic check will cure your problem by clearing the fault codes on your ECU

dean

Jul 29, 2008 | 1998 Jaguar XJ8L

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